CN104712284A - Liquid-operated reducing oil tube clamping blowout preventer - Google Patents

Abstract

The invention relates to a liquid-operated reducing oil tube clamping blowout preventer. The liquid-operated reducing oil tube clamping blowout preventer comprises a shell, a hydraulic cylinder, a reducing ram assembly, a reducing ram slip, a side door, a side door bolt and an oil opening connector; the liquid-operated reducing oil tube clamping blowout preventer further comprises a sealing mechanism. The reducing ram slip comprises two internal-diameter specifications, so that cylindrical oil tubes in the thick specification and the thin specification can be clamped through the one reducing ram slip, and the oil tubes can be clamped in a reducing mode. The reducing ram assembly comprises a reducing rubber core which comprises a reducing rubber body, iron pieces of abnormal-shaped cam structures, sizing blocks, movable rods and connecting rods; the reducing rubber core is a whole formed in the mode that the multiple iron pieces of the abnormal-shaped cam structures, the four sizing blocks, the two movable rods, the two connecting rods and rubber are vulcanized in a die at a time. The oil tubes in different specifications and different sizes can be closed through the one reducing rubber core, so that the oil tubes are clamped in the reducing mode; in addition, the liquid-operated reducing oil tube clamping blowout preventer is simple in structure and convenient to install; the labor production efficiency of workers is greatly improved, and new potential safety hazards are prevented.

Description

The reducing oil pipe clamping preventer surged

Technical field

The present invention relates to the oil pipe clamping preventer that a kind of oilfield downhole operation uses, the reducing oil pipe especially surged clamping preventer.

Background technology

Oil pipe clamping preventer is the well controlled blowout-proof device that oilfield downhole operation uses, a kind of because taking precautions against gas blowout accident and designing, can the device of timely safe closing well after well kick occurs; At present, oil pipe clamping preventer adopts hydraulic-driven, when lower oil tube, Oil/gas Well generation overflow or blowout or other spy oestrus condition time, oil pipe clamping preventer can realize closed Oil/gas Well well, and it is also the utensil of the clamping oil pipe that oilfield downhole operation uses simultaneously.Oil pipe clamping preventer comprises housing, hydraulic cylinder, flashboard assembly, flashboard slips, side door, side door bolt, port connection, and oil pipe clamping preventer also comprises sealing mechanism, oil pipe clamping preventer is bilateral symmetry, and namely its left side structure is identical with the specification framework of right side structure and symmetrical, housing comprises body and flange arrangement, body is rectangular structure, the center of body is the main through hole of hollow circular configuration, flange arrangement comprises neck flange and flange, housing there are two flange arrangements, two flange arrangements lay respectively at the both sides of body, the intermediate throughholes of two flange arrangement interlinks with main through hole respectively, the center line of flange arrangement and the center line of main through hole are on the same line, housing has multiple side through hole, side through hole communicates with main through hole respectively, its side through hole combines the structure forming multipair side through hole in pairs, a same side through hole to side through hole is positioned at main through hole side, another side through hole is positioned at main through hole opposite side, the center line of two side through hole on the same line and with the vertical and intersectant centerline of main through hole, hydraulic cylinder comprises cylinder barrel and cylinder cap, piston and piston rod, screw mandrel, cylinder barrel bolt and sealing device, piston rod is fixedly connected on the side of piston, the outer end of piston rod is pin thread structure, its top is plane, be referred to as to push up plane, the central axis of top plane and piston, the two sides be connected with top plane are plane and side plane, its two side plane respectively with top plane orthogonal, and be parallel to each other, the vertical distance that its two side plane arrives the center line of piston is respectively equal, between side plane with piston rod main body, fluted structure is connected, groove structure open at both ends, its groove structure comprises groove bottom and groove side, its groove bottom is parallel with side plane, its two grooves side is parallel to each other, and it is vertical with groove bottom, the top plane parallel of groove side and piston rod, piston rod there is the blind hole of connection wire rod, the blind hole of connection wire rod and the central through hole of piston interlink, the blind hole of connection wire rod and the central through hole of piston and piston rod, the center line of piston on the same line, internal thread is had in the central through hole of piston and the blind hole of connection wire rod that links together, screw mandrel comprises body and step, body is circular pin, the step of the outwardly annular of intermediate peripheral wall of body, its step separates leading portion and back segment screw mandrel body, the external diameter of leading portion is less than the external diameter of back segment, the leading portion of body there is male thread.Complement one another between the side through hole of hydraulic cylinder, side door and housing, the quantity correspondence of the side through hole of hydraulic cylinder, side door and housing is identical, hydraulic cylinder and being connected between side door and housing.Piston rod comprises the piston rod of clamping and the piston rod of blowout prevention, be connected between the piston rod of flashboard slips and corresponding clamping, be connected between the piston rod of flashboard assembly and corresponding blowout prevention, hydraulic cylinder and syndeton between side door and housing, namely piston rod packs in the hole in the middle of side door, piston is inserted in cylinder barrel, internal thread in the central through hole of the male thread on the leading portion of the body of screw mandrel and piston and the blind hole of the connection wire rod of piston rod that links together screws and is connected, cylinder cap sealing shroud connects the back segment of the body of screw mandrel, the sealing device of hydraulic cylinder comprises sealing between the back segment of the body of cylinder cap and screw mandrel and the sealing between cylinder cap and cylinder barrel and the sealing between side door and cylinder barrel, sealing between piston rod and side door, sealing between piston rod and side door is divided into two parts, a part is sealed well pressure, a part is the oil pressure that sealing hydraulic control produces, twice sealing mechanism is between this two department, for making the sealing at this place very reliable, there is the sealing ring of multiplet, and the auxiliary seal of middle O-ring seals, side door itself is connected with housing by side door bolt, side door is positioned at outside the side through hole of housing, side door is covered on side through hole, and cylinder cap and cylinder barrel are fixed together by cylinder barrel bolt and side door, and the sealing between side door and cylinder barrel adopts y-shaped ring to realize two way seal.The sealing mechanism of oil pipe clamping preventer comprises the sealing of sealing between side door and housing and oil circuit.The respective independently oil circuit hole of this distribution in vivo many of housing, it independently has a collar extension and two oil circuit apertures in oil circuit hole, collar extension is positioned on this outside, two oil circuit apertures corresponding same two side through hole to side through hole respectively in same independently oil circuit hole, namely two oil circuit apertures in same independently oil circuit hole are distributed in the same outside of a side through hole to side through hole corresponding with it and the outside of another side through hole respectively, the oil circuit aperture in the oil circuit hole of the body of housing and the corresponding connection of oil circuit ostium of side door, the collar extension in the oil circuit hole of the body of its housing is fixedly connected with port connection, there are two oil circuit apertures in the outside of side through hole, and its two oil circuits aperture belongs to two oil circuit holes respectively, and its two oil circuit holes are respectively the oil circuit hole of control piston advance and the oil circuit hole of control piston retrogressing, have an oil circuit hole in cylinder cap body, cylinder cap body is pierced in all side of being connected corresponding to cylinder barrel inside cylinder cap, its oil circuit hole, and passes from the centre inside cylinder cap, cylinder barrel has an oil circuit hole, the oil circuit aperture, all sides in cylinder cap oil circuit hole connects with an oil circuit orifice sealing in the oil circuit hole of cylinder barrel, the oil circuit aperture of the centre of the inner side in the oil circuit hole of cylinder cap is led in cylinder barrel, the oil circuit hole of two break-through side doors is had in its side door, the oil circuit hole advanced with another oil circuit aperture in the oil circuit hole of cylinder barrel and the control piston of housing respectively in the two oil circuit apertures in an oil circuit hole of side door seals and interlinks, and the oil circuit hole that another oil circuit hole of side door and the control piston of housing retreat seals and interlinks and lead in cylinder barrel, each parts are successively installed connection according to program respectively and are completed, and have rubber seal rings for seal to connect, form the oil circuit of independent completion sealing between its oil circuit aperture mutually directly connected.The sealing of oil circuit comprises the sealing of the oil circuit hole collar extension of sealing between the oil circuit aperture that mutually directly connects and port connection and housing.Oil pipe clamping preventer equipment flashboard assembly and flashboard slips.Flashboard assembly comprises gate panel body and seal, gate panel body there is box structure, box structure matches with the pin thread structure of the outer end of the piston rod of blowout prevention, it is convex straight trough, it is made up of inside groove and water jacket, namely there is convex straight trough in the outside of gate panel body, horizontal break-through pedestal, its groove bottom is plane, convex straight trough comprises inside groove and water jacket, the width of its inside groove is greater than the width of water jacket, vertical distance between two groove sides of water jacket is identical with the vertical distance between two groove bottom of two groove structures at the top of the pin thread structure of the outer end of the piston rod of blowout prevention, the width of the groove structure groove bottom of the pin thread structure of the outer end of the piston rod of its blowout prevention is identical with the width of the groove side of the water jacket of the box structure of gate panel body, the pin thread structure top plane of the outer end of the piston rod of blowout prevention is identical to the degree of depth of the inside groove of the vertical distance of groove side adjacent with top plane of groove structure and the box structure of gate panel body, vertical distance between two side planes of the pin thread structure of the outer end of the piston rod of blowout prevention is equal with the vertical distance between two groove sides of the inside groove of the convex straight trough of the box structure of gate panel body, gate panel body complements one another with seal and is connected.Flashboard slips is the shape and structure of block, flashboard slips external surface there is the outerplanar be parallel to each other that two relative arc outer wall faces are relative with two, arc outer wall face is crossing with two outerplanars respectively to be connected, outerplanar is vertical with the middle tangent plane of flashboard slips, two outerplanar, one is upper plane, and another is baseplane.Flashboard slips comprises hatch frame, box structure, and hatch frame, box structure lay respectively at the front and rear of flashboard slips.Hatch frame is positioned at the front portion of flashboard slips, hatch frame refers to the opening of the circular arc of the centre of the front portion of flashboard slips, the top layer of the inwall of the circular arc of its hatch frame is slip insert structure, slip insert structure is arranged to form by several slip inserts, slip insert is the pincers tooth of arc, the inner circumferential of each slip insert is on same affiliated circular arc side face, and at grade, its arc core line is vertical with the outerplanar of flashboard slips for the arc core line of hatch frame and the middle tangent plane of flashboard slips; Because there is hatch frame the front portion of flashboard slips, just there are two fronts the front portion of its flashboard slips, and two fronts lay respectively at the both sides of the middle tangent plane of flashboard slips symmetrically.The front portion of flashboard slips comprises two fronts, box structure is positioned at the rear portion of flashboard slips, and box structure is convex slot, and it is made up of inside groove and water jacket, horizontal break-through flashboard slips, and its groove bottom is plane, and convex slot comprises inside groove and water jacket, and the width of its inside groove is greater than the width of water jacket, the box structure of its flashboard slips cooperatively interacts to the pin thread structure of the outer end of the corresponding piston rod of hydraulic pressure gate slips binding clasp, its corresponding piston rod is referred to as the piston rod clamped, vertical distance between two groove sides of the water jacket of the box structure of flashboard slips is identical with the vertical distance between two groove bottom of two groove structures at the top of the pin thread structure of the outer end of the piston rod of clamping, the width of groove structure groove bottom of the pin thread structure of the outer end of the piston rod of its clamping is identical with the width of the groove side of the water jacket of box structure, the pin thread structure top plane of the outer end of the piston rod of clamping is identical with the degree of depth of the inside groove of box structure to the vertical distance of groove side adjacent with top plane of groove structure, vertical distance between two side planes of the pin thread structure of the outer end of the piston rod of clamping is equal with the vertical distance between two groove sides of the inside groove of the convex slot of box structure, like this, the piston rod of clamping packs in the hole in the middle of side door, and the pin thread structure of the piston rod of clamping to inject in the box structure on slip spider and mutually coincide.Oil pipe clamping preventer is bilateral symmetry, in the multipair side through hole of housing, two side through hole are wherein had to be the side through hole clamped, other each side through hole is the side through hole of blowout prevention, the side through hole pair-wise combination of two clampings forms the structure of the side through hole of a pair clamping, flashboard slips there is box structure, flashboard slips between two relatively mounted in pairs in clamping side through hole in, namely on same a pair left side of housing, in the side through hole of right clamping, flashboard slips is installed respectively, the pin thread structure of the piston rod of the clamping of its correspondence to inject in the box structure on flashboard slips and mutually coincide, two flashboard slips complements one another, relatively form one group of flashboard slips between two, one group flashboard slips is a set of flashboard slips, and flashboard assembly is installed in the side through hole of its blowout prevention, on same a pair left side of housing, flashboard assembly in the side through hole of right blowout prevention complements one another, relative between two, and mutually coincide in the box structure that the pin thread structure of the piston rod of the blowout prevention of its correspondence injects on gate panel body, the flashboard assembly that two complements one another forms one group of flashboard assembly, one group flashboard assembly is a set of flashboard assembly, the side through hole of blowout prevention is corresponding identical with the quantity of flashboard assembly.Flashboard assembly has two classes, and a class flashboard assembly is full seal structure, is referred to as blind rams assembly, and another kind of flashboard assembly is half seal structure, is referred to as half envelope flashboard assembly.Half envelope flashboard assembly comprise half envelope gate panel body, partly seal anterior glue core and top glue core, partly seal anterior glue core and comprise agent structure and external ear, agent structure is the structure of semi-toroidal shape, the external ear forming symmetrical bulk shape is protruded at the left and right two ends of its agent structure respectively to outside, thus, the head of its agent structure and external ear are interconnected to form the head of the anterior glue core of half envelope, and partly sealing anterior glue core has two heads, the gate panel body of half envelope there is hatch frame, hatch frame is positioned at the front portion of the gate panel body of half envelope, hatch frame with partly seal anterior glue core and adapt to, match, hatch frame comprises two opening sheets, the anteriomedial of opening sheet has the opening of arc, its opening both sides are respectively forward plane, two forward plane is crossing with the inner circumferential wall of opening respectively to be connected, two forward plane at grade, the arc core line of the inner circumferential wall of opening and the middle tangent plane of half gate panel body sealed are at grade, forward plane is mutually vertical with the middle tangent plane of gate panel body, opening sheet has inner face, the arc core line of the inner circumferential wall of opening is vertical with inner face, its inner face is vertical with forward plane, the inner face of two opening sheets is parallel to each other relatively, two opening sheets are respectively top opening sheet and bottom opening sheet, and the arc core line of the inner circumferential wall of two openings on the same line, the inner circumferential wall of arc is had to connect between the inner face of two opening sheets, the inner circumferential wall of its arc is referred to as center peripheral wall surfaces, the arc core line of the arc core line of its center peripheral wall surfaces and the inner circumferential wall of opening on the same line, the diameter of its center peripheral wall surfaces is greater than the diameter of the inner circumferential wall of opening, center peripheral wall surfaces is crossing with the inner face of two opening sheets respectively to be connected, there is inner plane the both sides of center peripheral wall surfaces respectively, two inner planes at grade, inner plane is parallel with forward plane, inner plane is crossing with center peripheral wall surfaces to be connected, inner plane intersects vertically with the inner face of opening sheet and is connected, arc seal groove is arranged at the top of the gate panel body of half envelope, arc seal groove comprises intermediate seal groove and side seal groove, two side seal grooves lay respectively at the both sides of intermediate seal groove, intermediate seal groove is connected with both sides sealing groove respectively, the degree of depth of intermediate seal groove is less than the degree of depth of side seal groove, the groove bottom of intermediate seal groove is parallel with the groove bottom of side seal groove, the groove bottom of intermediate seal groove is parallel with inner face, the groove bottom of side seal groove intersects vertically with inner plane and is connected, the vertical distance of the inner face that the vertical distance of the groove bottom of the side seal groove inner face of opening sheet is on earth the less than top opening sheet inner face of opening sheet on earth, make the groove bottom of side seal groove, a breach is formed between the inner face of inner plane and top opening sheet, inner plane has connection partly seal the blind hole of anterior glue core, its blind hole center line is vertical with inner plane, the groove bottom of side seal groove has the blind hole connecting top glue core, and its blind hole center line is vertical with the groove bottom of side seal groove, and two blind holes intersections communicate, the bottom opening sheet of the gate panel body of half envelope there are centering guiding oblique angle and centering gathering sill, bottom opening sheet has the water jacket connecting centering guiding oblique angle, centering guiding oblique angle is fixedly connected on water jacket, and the fixed connection structure of centering guiding oblique angle and water jacket adopts welded construction or adopts headless screw syndeton, when adopting headless screw syndeton, its bottom opening sheet there are two through holes, the center line of its through hole is vertical with the inner face on bottom opening sheet, two through hole communicates with water jacket respectively, its through hole is female thread structure, there are two internal thread holes matching corresponding with the through hole of two on bottom opening sheet at oblique angle to centering guiding, is fastenedly connected bottom opening sheet and centering guiding oblique angle respectively by headless screw, and centering guiding oblique angle is fixedly connected on water jacket.Like this, partly seal gate panel body that anterior glue core and half seals to cooperatively interact and be connected, it partly seals anterior glue core pressure and is sandwiched between the top opening sheet of the hatch frame of the gate panel body of half envelope and bottom opening sheet, and the connection that the connecting rod that the colloid of the anterior glue core of half envelope is stretched out in the outer end partly sealing the connecting rod of anterior glue core namely injects the gate panel body of half envelope completely is partly sealed in the blind hole of anterior glue core; Top glue core pressure is embedding to be sandwiched in the arc seal groove at the top of the gate panel body of half envelope, and the connecting rod stretching out the colloid of top glue core of its top glue core injects in the blind hole of connection top glue core of the gate panel body of half envelope completely; The connecting rod of its top glue core injects and partly seals in the hole of the outer end of the connecting rod of anterior glue core.Like this, its top glue core and partly seal anterior glue core and be attached on the gate panel body of half envelope respectively, Jiao Xin two, top cooperatively interacts with two heads partly sealing anterior glue core respectively and links together, and Jiao Xin two, top cooperatively interacts with the external ear partly sealing anterior glue core two ends respectively and links together and form confined space.Thus, form the flashboard assembly of half envelope.When oil pipe clamping preventer equipment blind rams assembly, it is the oil pipe clamping preventer of full seal structure; When oil pipe clamping preventer equipment half envelope flashboard assembly, it is the oil pipe clamping preventer of half seal structure; When hydraulic oil clamping preventer not only equipped full envelope but also equipment half envelope flashboard assembly time, it be that full envelope and the oil pipe partly sealing the structure combined clamp preventer; Oil pipe clamping preventer is the oil pipe clamping preventer of combining structure, according to the difference of equipped flashboard assembly quantity, oil pipe clamping preventer comprises the oil pipe clamping preventer of double disc and the oil pipe clamping preventer of many flashboards, when oil pipe clamping preventer equips one group of flashboard assembly and one group of flashboard slips, it is the oil pipe clamping preventer of double disc; When oil pipe clamping preventer equips two groups and flashboard assembly more than two and one group of flashboard slips or one group of flashboard assembly and two groups and two groups of flashboard slips, it be that the oil pipe of many flashboards clamps preventer.Port connection is tightly connected the hydraulic oil pipeline of hydraulic system, when hydraulic control system hydraulic oil enters the cylinder barrel closedown chamber, left and right controlling flashboard assembly, promote piston-advance and drive left and right flashboard assembly to move respectively to well head center along the side through hole of housing, realize closing Oil/gas Well, when hydraulic oil enters cylinder barrel unlatching chamber, left and right, promote piston retreat and drive left and right flashboard assembly to leaving the motion of well head center position, open Oil/gas Well, flashboard assembly switch is controlled by the reversal valve of the hydraulic control unit of hydraulic system.The oil pipe clamping preventer of full seal structure, by cutting out or open blind rams assembly, thus realizes totally-enclosed well head or opens well head; The oil pipe clamping preventer of half seal structure, by cutting out or open half envelope flashboard assembly, thus realizes the annular space closed between oil pipe and sleeve pipe or the annular space opened between oil pipe and sleeve pipe; Full envelope and the oil pipe clamping preventer partly sealing the structure combined, by closing or open blind rams assembly, thus realize totally-enclosed well head or open well head, again by closing or open half envelope flashboard assembly, thus realize the annular space closed between oil pipe and sleeve pipe or the annular space opened between oil pipe and sleeve pipe.When hydraulic control system hydraulic oil enters the cylinder barrel closedown chamber, left and right controlling flashboard slips, promote piston-advance and drive left and light brake board watt to move respectively to well head center along the side through hole of housing, realize clamping oil pipe, when hydraulic oil enters cylinder barrel unlatching chamber, left and right, promote piston retreat and drive left and light brake board watt to move to leaving well head center position, unclamp oil pipe, flashboard slips switch is controlled by the reversal valve of the hydraulic control unit of hydraulic system.At present, half envelope flashboard assembly and the flashboard slips of the oil pipe clamping preventer equipment of oil well are single size half envelope flashboard assembly and single size flashboard slips, namely a kind of half envelope flashboard assembly of size can only seal the oil pipe of corresponding size, a kind of flashboard slips of size can only clamp the oil pipe of corresponding size, and oil well a set of oil pipe used is all the combination tubing be formed by connecting by the oil pipe of different size mostly, therefore the flashboard assembly and the flashboard slips that are equipped with different size is needed, the internal diameter specification of flashboard slips refers to the internal diameter specification of the inwall side face of the slip insert of flashboard slips, thus will satisfy the demand by changing partly envelope flashboard assembly and flashboard slips, so not only increase workload when operating, and there is potential safety hazard, so existing oil pipe clamping preventer can not meet the requirement needed for well workover.

Summary of the invention

The object of the invention is: a kind of reducing oil pipe clamping preventer surged is provided, partly envelope flashboard assembly and the flashboard slips which overcome oil pipe clamping preventer equipment are the defect of single size half envelope flashboard assembly and single size flashboard slips, and the reducing oil pipe surged clamping preventer equips flashboard assembly and the variable bore ram slips of reducing; It just can clamp the oil pipe of the column type of thick, thin two kinds of specifications by its a set of variable bore ram slips, realize reducing clamping oil pipe; It can close the oil pipe of different specification size by the flashboard total performance of its a set of reducing, realizes reducing sealing oil pipe; Eliminate the replacing half envelope flashboard assembly of oil pipe clamping preventer and the trouble of flashboard slips, and structure is simple, easy for installation; Drastically increase the labor productivity of workman, stop to produce new potential safety hazard.

The object of the present invention is achieved like this: the reducing oil pipe clamping preventer surged is the well controlled blowout-proof device that oilfield downhole operation uses, a kind of because taking precautions against gas blowout accident and designing, can the device of timely safe closing well after well kick occurs, when underground work, blowout prevention can be realized well; It adopts hydraulic-driven, is a kind of oil pipe clamping preventer, is also the utensil of the clamping oil pipe that oilfield downhole operation uses simultaneously.The reducing oil pipe clamping preventer surged comprises housing, hydraulic cylinder, the flashboard assembly of reducing, variable bore ram slips, side door, side door bolt, port connection, and the reducing oil pipe surged clamping preventer also comprises sealing mechanism, the reducing oil pipe clamping preventer surged is bilateral symmetry, and namely its left side structure is identical with the specification framework of right side structure and symmetrical, housing comprises body and flange arrangement, body is rectangular structure, the center of body is the main through hole of hollow circular configuration, flange arrangement comprises neck flange and flange, housing there are two flange arrangements, two flange arrangements lay respectively at the both sides of body, the intermediate throughholes of two flange arrangement interlinks with main through hole respectively, the center line of flange arrangement and the center line of main through hole are on the same line, housing has four side through hole, side through hole communicates with main through hole respectively, its side through hole combines the structure of formation two pairs of side through hole in pairs, a same side through hole to side through hole is positioned at main through hole side, another side through hole is positioned at main through hole opposite side, the center line of same two side through hole to side through hole on the same line and with the vertical and intersectant centerline of main through hole, two pairs of side through hole lay respectively at the upper and lower layer of housing, and its side through hole being positioned at the upper strata of housing is referred to as the side through hole clamped, its side through hole being positioned at the lower floor of housing is the side through hole of blowout prevention.Hydraulic cylinder comprises cylinder barrel and cylinder cap, piston and piston rod, screw mandrel, cylinder barrel bolt and sealing device, piston rod is fixedly connected on the side of piston, the outer end of piston rod is pin thread structure, its top is plane, be referred to as to push up plane, the central axis of top plane and piston, the two sides be connected with top plane are plane and side plane, its two side plane respectively with top plane orthogonal, and be parallel to each other, the vertical distance that its two side plane arrives the center line of piston is respectively equal, between side plane with piston rod main body, fluted structure is connected, groove structure open at both ends, its groove structure comprises groove bottom and groove side, its groove bottom is parallel with side plane, its two grooves side is parallel to each other, and it is vertical with groove bottom, the top plane parallel of groove side and piston rod, piston rod there is the blind hole of connection wire rod, the blind hole of connection wire rod and the central through hole of piston interlink, the blind hole of connection wire rod and the central through hole of piston and piston rod, the center line of piston on the same line, internal thread is had in the central through hole of piston and the blind hole of connection wire rod that links together, screw mandrel comprises body and step, body is circular pin, the step of the outwardly annular of intermediate peripheral wall of body, its step separates leading portion and back segment screw mandrel body, the external diameter of leading portion is less than the external diameter of back segment, the leading portion of body there is male thread.Complement one another between the side through hole of hydraulic cylinder, side door and housing, the quantity correspondence of the side through hole of hydraulic cylinder, side door and housing is identical, hydraulic cylinder and being connected between side door and housing.Piston rod comprises the piston rod of clamping and the piston rod of blowout prevention, be connected between the piston rod of variable bore ram slips and corresponding clamping, be connected between the flashboard assembly of reducing and the piston rod of corresponding blowout prevention, hydraulic cylinder and syndeton between side door and housing, namely piston rod packs in the hole in the middle of side door, piston is inserted in cylinder barrel, internal thread in the central through hole of the male thread on the leading portion of the body of screw mandrel and piston and the blind hole of the connection wire rod of piston rod that links together screws and is connected, cylinder cap sealing shroud connects the back segment of the body of screw mandrel, the sealing device of hydraulic cylinder comprises sealing between the back segment of the body of cylinder cap and screw mandrel and the sealing between cylinder cap and cylinder barrel and the sealing between side door and cylinder barrel, sealing between piston rod and side door, sealing between piston rod and side door is divided into two parts, a part is sealed well pressure, a part is the oil pressure that sealing hydraulic control produces, twice sealing mechanism is between this two department, for making the sealing at this place very reliable, there is the sealing ring of multiplet, and the auxiliary seal of middle O-ring seals, side door itself is connected with housing by side door bolt, side door is positioned at outside the side through hole of housing, side door is covered on side through hole, and cylinder cap and cylinder barrel are fixed together by cylinder barrel bolt and side door, and the sealing between side door and cylinder barrel adopts y-shaped ring to realize two way seal.The sealing mechanism of the reducing oil pipe clamping preventer surged comprises the sealing of sealing between side door and housing and oil circuit.The respective independently oil circuit hole of this distribution in vivo many of housing, there are a collar extension and two oil circuit apertures in its oil circuit hole independently, collar extension is positioned on this outside, two oil circuit apertures corresponding same two side through hole to side through hole respectively in same independently oil circuit hole, namely two oil circuit apertures in same independently oil circuit hole are distributed in the same outside of a side through hole to side through hole corresponding with it and the outside of another side through hole respectively, the oil circuit aperture in the oil circuit hole of the body of housing and the corresponding connection of oil circuit ostium of side door, the collar extension in the oil circuit hole of the body of its housing is fixedly connected with port connection, there are two oil circuit apertures in the outside of side through hole, and its two oil circuits aperture belongs to two oil circuit holes respectively, and its two oil circuit holes are respectively the oil circuit hole of control piston advance and the oil circuit hole of control piston retrogressing, have an oil circuit hole in cylinder cap body, cylinder cap body is pierced in all side of being connected corresponding to cylinder barrel inside cylinder cap, its oil circuit hole, and passes from the centre inside cylinder cap, cylinder barrel has an oil circuit hole, the oil circuit aperture, all sides in cylinder cap oil circuit hole connects with an oil circuit orifice sealing in the oil circuit hole of cylinder barrel, the oil circuit aperture of the centre of the inner side in the oil circuit hole of cylinder cap is led in cylinder barrel, the oil circuit hole of two break-through side doors is had in its side door, the oil circuit hole advanced with another oil circuit aperture in the oil circuit hole of cylinder barrel and the control piston of housing respectively in the two oil circuit apertures in an oil circuit hole of side door seals and interlinks, and the oil circuit hole that another oil circuit hole of side door and the control piston of housing retreat seals and interlinks and lead in cylinder barrel, each parts are successively installed connection according to program respectively and are completed, and have rubber seal rings for seal to connect, form the oil circuit of independent completion sealing between its oil circuit aperture mutually directly connected.The sealing of oil circuit comprises the sealing of the oil circuit hole collar extension of sealing between the oil circuit aperture that mutually directly connects and port connection and housing.The flashboard assembly of the reducing oil pipe clamping preventer equipment reducing surged and variable bore ram slips.The flashboard assembly of reducing belongs to the one of half envelope flashboard assembly, and the flashboard assembly of reducing comprises gate panel body and the seal of half envelope, and seal comprises top glue core, reducing glue core; The gate panel body of half envelope of the flashboard assembly of reducing matches with top glue core, reducing glue core, and the gate panel body of half envelope of the flashboard assembly of its reducing is referred to as variable bore ram body; Variable bore ram body complements one another with seal and is connected.Top glue core also claims top sealing, and reducing glue core also claims front reducing to seal; Reducing glue core is made up of agent structure and external ear, its agent structure is the structure of semi-toroidal shape, left and right two head part of its agent structure protrude the external ear forming symmetrical bulk shape not laterally, thus, the head of its agent structure and external ear are interconnected to form the head of reducing glue core, and reducing glue core has two heads; Reducing glue core comprises reducing colloid, ironware, parallels, motion bar, connecting rod; Reducing colloid is the carrier of ironware, parallels, motion bar, connecting rod, and ironware, parallels, motion bar, connecting rod are incorporated among reducing colloid respectively.Reducing glue core comprises multiple ironware, four parallels, two motion bars and two connecting rods; Reducing glue core is by the disposable sulfuration and become an entirety in mould of multiple ironware, four parallels, two motion bars and two connecting rods and rubber.Ironware is the structure of special-shaped cam, ironware is made up of two special-shaped cams and connector, the end of ironware is special-shaped cam, special-shaped cam comprises head, middle part and afterbody, special-shaped cam is the structure of narrow " V " shape leaf lobe shape of head, special-shaped cam has lateral surface and medial surface, and lateral surface and the medial surface of special-shaped cam are parallel to each other, the outer wall of the head of special-shaped cam is arc-shaped surface, the outer wall of the head of its special-shaped cam is respectively with the lateral surface of special-shaped cam with medial surface is crossing connects, there are two wall planes be connected that intersect vertically with lateral surface and medial surface respectively at the middle part of special-shaped cam, two wall plane apportion both sides, two wall planes are crossing with the two ends of the outer wall of head respectively to be connected, in two wall planes, the short wall plane of its length is referred to as shortwall plane, the wall plane that its length is long is referred to as longwell plane, the afterbody of special-shaped cam is convex-concave curved configuration, the afterbody of special-shaped cam comprises the outside wall surface of " s " shape, the outside wall surface of arc curve and tail wall plane, the outside wall surface of " s " shape, the outside wall surface of arc curve and tail wall plane are respectively with the lateral surface of special-shaped cam with medial surface is crossing is connected, one end of the outside wall surface of " s " shape connects longwell plane, the other end of the outside wall surface of " s " shape connects tail wall plane, one end of the outside wall surface of arc connects shortwall plane, the other end of the outside wall surface of arc connects tail wall plane, like this, tail wall interplanar is in the outside wall surface of " s " shape, between the outside wall surface of arc, and respectively with the outside wall surface of " s " shape, the outside wall surface of arc curve intersects and connects, the inner side being positioned at the affiliated plane of longwell plane of the outside wall surface of " s " shape, the protrusion of the outside wall surface of arc curve and be positioned at the outside of the affiliated plane of shortwall plane, like this, the interior angle of the affiliated plane of tail wall plane and the affiliated Plane intersects of shortwall plane is obtuse angle, and the interior angle of the affiliated plane of tail wall plane and the affiliated Plane intersects of longwell plane is acute angle, connector is flat bar structure, and connector has two lateral surfaces and two arc surfaces, and two lateral surfaces of connector are parallel to each other, and lateral surface is between two arc surfaces, and arc surface is crossing with two lateral surfaces respectively to be connected, connector two connects special-shaped cam respectively, the medial surface of special-shaped cam intersects with connector and is vertically connected, two lateral surfaces of the center line difference connector of its connector are parallel and vertical with medial surface with the lateral surface of special-shaped cam, and two special-shaped cams be positioned at respectively symmetrically connector two outside, an arc surface of connector and the head of special-shaped cam are in the same side, and another arc surface of connector and the afterbody of special-shaped cam are in the same side.Reducing glue core has multiple ironware, multiple ironware is incorporated among reducing colloid respectively, multiple ironware is spaced, evenly forward, ordered arrangement, the center line of the connector of its each ironware is parallel to each other and respectively on same circular arc, spacing distance between the center line of the connector of each ironware is identical, the lateral surface being positioned at the special-shaped cam of the same side of its each ironware at grade, the medial surface being positioned at the special-shaped cam of the same side of each ironware at grade, thus multiple ironware forms the assembly of the frame construction of semi-ring form, assembly belongs to a part for reducing glue core agent structure, two special-shaped cams of same ironware lay respectively at the skin of the both sides of reducing glue core agent structure.It is inner that its ironware is longitudinally erected in reducing colloid, the head of the special-shaped cam of ironware is positioned at inner side, the afterbody of the special-shaped cam of ironware is positioned at outside, the head of ironware does not point to the arc core line of the circular arc at the center line place of the connector of each ironware, arc core line refer to the circular arc at the center line place of the connector through its each ironware arc core and respectively with the center line of the centerline parallel of the connector of each ironware, ironware is tiltedly to its arc core line, and the head of the special-shaped cam of ironware refers to the side of arc core line partially; Interval between the head of the special-shaped cam of its multiple ironware is identical, and equally, the interval between the afterbody of the special-shaped cam of its multiple ironware is identical.Parallels is rectangle structure, and there is through hole the centre of parallels, and its through hole has two relative inwall side planes be parallel to each other and two relative arc inner wall faces, and relative with two the respectively inwall side plane be parallel to each other in arc inner wall face is crossing to be connected; Motion bar is columniform bar, and it comprises mobile jib and bar head, and bar head has two, mobile jib two ends are connecting-rod cap respectively, mobile jib and bar head are respectively cylindrical shape, and the diameter of mobile jib is greater than the diameter of bar head, and the center line of mobile jib and bar head and motion bar on the same line.Connecting rod is interconnected to constitute by main body bar and major part, main body bar is cylindrical shape, there is through hole the outer end of the main body bar of its connecting rod, its through hole has two relative inwall side planes be parallel to each other and two relative arc inner wall faces, and relative with two the respectively inwall side plane be parallel to each other in arc inner wall face is crossing to be connected; Major part there are a medial plane and breach, its medial plane is parallel with the inwall side plane of the through hole of main body bar, its breach is the opening of the shape of arc side face, and the arc core line of the arc side face of its breach is parallel with medial plane, its arc core line and main body bar central axis.The glue plane that the head of reducing glue core has two to be parallel to each other, wherein, a glue plane is front glue plane before head, another glue plane back side after head is rear glue plane, the front glue plane of two heads of reducing glue core at grade, its place plane is vertical with the longitudinally middle tangent plane of reducing glue core, and the rear glue plane of two heads of reducing glue core at grade.Its motion bar is longitudinally erected in the inside of the head of reducing glue core, and be erected in the outside of assembly, the center line of the center line of motion bar and the connector of ironware is parallel to each other, the bar head of motion bar one end puts in the through hole of a parallels, the bar head of the motion bar other end puts in the through hole of another parallels, be connected between its motion bar and parallels, the center line of motion bar is vertical with the lateral surface of two parallels respectively, motion bar and connecting rod are interconnected, connecting rod links the mobile jib of motion bar by the breach on its major part, make the center line of main body bar and the central axis of motion bar of connecting rod, and the center line of the main body bar of connecting rod divides the vertical distance of the lateral surface being clipped to two parallels equal, the outer end of the main body bar of connecting rod stretches out reducing colloid backward, namely the rear glue plane of the head of reducing glue core is stretched out, thus, its motion bar and two parallels be directly connected with its motion bar, connecting rod forms a grip assembly, one head of its reducing glue core comprises a grip assembly, and another head of its reducing glue core comprises another set of assembly, it is positioned at the lateral surface of two parallels of the same side of reducing glue core at grade, the center line of the main body bar of two connecting rod is parallel to each other, and the center line of the main body bar of two connecting rods divides the vertical distance of the longitudinally middle tangent plane being clipped to reducing glue core equal.The agent structure of reducing glue core comprises the outer ring of arc and semicircular inner ring, glue plane after connection two is intersected in outer ring, inner ring intersects the front glue plane of connection two, the arc core line of the arc core line of outer ring and the arc core line of inner ring and assembly is same straight line, and its arc core line is in plane belonging to the longitudinally middle tangent plane of reducing glue core; Its inner ring is sandwiched between the affiliated plane of the medial surface of two special-shaped cams of same ironware, and in the middle of inner ring is longitudinal, the longitudinally middle tangent plane of tangent plane and reducing glue core is same plane.The inner ring of the agent structure of reducing glue core adopts the structure of semicircular inwall side face or adopts the structure of semi-ring body.Two heads of reducing glue core, one for there being the head of two interfaces, one for there being the head of two guide grooves; At the head having two interfaces of reducing glue core, two special-shaped cams of the ironware of one end of its assembly stretch out corresponding front glue plane respectively, the part at middle part that the part of stretching out front glue plane of its special-shaped cam is the whole of a part for the head of its special-shaped cam or the head of the head of special-shaped cam and the part at middle part or special-shaped cam and is inconjunction with, the part of stretching out front glue plane of its special-shaped cam is referred to as stretched head, stretched head is two, and the interface of the head of its reducing glue core is in front glue plane; At the head having two guide grooves of reducing glue core, two special-shaped cams of the ironware of the other end of its assembly stretch out its front glue plane corresponding respectively, the part of stretching out front glue plane of its special-shaped cam is the part of the afterbody of its special-shaped cam or the afterbody of special-shaped cam and the part at middle part, two special-shaped cams of the ironware of this end of its assembly respectively and produce the breach of two dihedrals between inner ring and front glue plane, its breach is guide groove, the part of stretching out front glue plane of the special-shaped cam of this end of its assembly is referred to as to stretch out tail, and stretching out tail is two; When the inner ring of the agent structure of reducing glue core adopts the structure of semicircular inwall side face, each special-shaped cam of the inside outstanding assembly of its inner ring; When the structure of the inner ring employing semi-ring body of the agent structure of reducing glue core, the structure of semi-ring body comprises semicircular inwall side face and semi-ring body, semi-ring body connects and is positioned at the middle part of semicircular inwall side face, the semicircular inwall side face that semi-ring body is inwardly outstanding, and each special-shaped cam inwardly giving prominence to assembly; Its semi-ring body is sandwiched between the affiliated plane of the medial surface of two special-shaped cams of same ironware, semi-ring body longitudinally in the middle of tangent plane and reducing glue core longitudinally in the middle of tangent plane be same plane, a part for the head of two special-shaped cams of each ironware of assembly or the head of the head of two special-shaped cams and the part at middle part or two special-shaped cams whole and the part at middle part that is inconjunction with thereof are respectively to the interior inwall side face tiltedly stretching out inner ring.Parallels protrudes the agent structure of reducing glue core, be positioned at the outside of the affiliated plane of the lateral surface of special-shaped cam, interlaced between the special-shaped cam of parallels and the ironware in the head of reducing glue core, partially overlap, its parallels is positioned at the skin of the head of reducing glue core, and connect the head of the agent structure of reducing glue core, parallels belongs to a part for external ear; Variable bore ram body complements one another with seal and is connected.Variable bore ram body there is hatch frame, hatch frame is positioned at the front portion of variable bore ram body, hatch frame and reducing glue core adapt to, match, hatch frame comprises two opening sheets, the anteriomedial of opening sheet has the opening of arc, its opening both sides are respectively forward plane, two forward plane is crossing with the inner circumferential wall of the opening of the arc of the anteriomedial of opening sheet respectively to be connected, two forward plane at grade, the arc core line of the inner circumferential wall of opening and the middle tangent plane of variable bore ram body are at grade, forward plane is mutually vertical with the middle tangent plane of variable bore ram body, opening sheet has middle inner face and two side inner faces, two side inner faces lay respectively at the both sides of middle inner face, two side inner faces at grade, middle inner face is parallel with side inner face, middle inner face is mutually vertical with the arc core line of the inner circumferential wall of opening, middle inner face protrudes from side inner face, thus connected by side between its middle inner face and side inner face, its side is vertical with side inner face with middle inner face to be respectively connected, two opening sheets are respectively top opening sheet and bottom opening sheet, the middle inner face of top opening sheet is relative with the middle inner face of bottom opening sheet and be parallel to each other, the side inner face of top opening sheet is relative with the side inner face of bottom opening sheet and be parallel to each other, and the arc core line of the inner circumferential wall of the opening of two opening sheets on the same line, the inner circumferential wall of arc is had to connect between the middle inner face of two opening sheets, the inner circumferential wall of its arc is referred to as center peripheral wall surfaces, the arc core line of the arc core line of its center peripheral wall surfaces and the inner circumferential wall of opening on the same line, the diameter of its center peripheral wall surfaces is greater than the diameter of the inner circumferential wall of opening, center peripheral wall surfaces is crossing with the middle inner face of two opening sheets respectively to be connected, there is inner plane the both sides of center peripheral wall surfaces respectively, two inner planes at grade, inner plane is parallel with forward plane, inner plane is crossing with center peripheral wall surfaces to be connected, be connected by interior lead angle between inner plane with side inner face, arc seal groove is arranged at the top of variable bore ram body, arc seal groove comprises intermediate seal groove and side seal groove, two side seal grooves lay respectively at the both sides of intermediate seal groove, intermediate seal groove is connected with both sides sealing groove respectively, the degree of depth of intermediate seal groove is less than the degree of depth of side seal groove, the groove bottom of intermediate seal groove is parallel with the groove bottom of side seal groove, the groove bottom of intermediate seal groove is parallel with middle inner face, the groove bottom of side seal groove intersects vertically with inner plane and is connected, the vertical distance of the side inner face that the vertical distance of the groove bottom of the side seal groove side inner face of opening sheet is on earth the less than top opening sheet side inner face of opening sheet on earth, make the groove bottom of side seal groove, a breach is formed between the side inner face of inner plane and top opening sheet, inner plane has the blind hole connecting reducing glue core, its blind hole center line is vertical with inner plane, the groove bottom of side seal groove has the blind hole connecting top glue core, and its blind hole center line is vertical with the groove bottom of side seal groove, and two blind holes intersections communicate, the bottom opening sheet of variable bore ram body there are centering guiding oblique angle and centering gathering sill, bottom opening sheet has the water jacket connecting centering guiding oblique angle, centering guiding oblique angle is fixedly connected on water jacket, and the fixed connection structure of centering guiding oblique angle and water jacket adopts welded construction or adopts headless screw syndeton, when adopting headless screw syndeton, its bottom opening sheet there are two through holes, the center line of its through hole is vertical with the middle inner face on bottom opening sheet, two through hole communicates with water jacket respectively, its through hole is female thread structure, there are two internal thread holes matching corresponding with the through hole of two on bottom opening sheet at oblique angle to centering guiding, is fastenedly connected bottom opening sheet and centering guiding oblique angle respectively by headless screw, and centering guiding oblique angle is fixedly connected on water jacket.Like this, reducing glue core cooperatively interacts with variable bore ram body and is connected, its reducing glue core pressure is sandwiched between the top opening sheet of the hatch frame of variable bore ram body and bottom opening sheet, and the main body bar that the connecting rod of reducing colloid is stretched out in the outer end of the main body bar of the connecting rod of reducing glue core namely injects in the blind hole of connection reducing glue core of variable bore ram body completely; Top glue core pressure is embedding to be sandwiched in the arc seal groove at the top of variable bore ram body, and the connecting rod stretching out the top colloid of top glue core of its top glue core injects in the blind hole of connection top glue core of variable bore ram body completely; The connecting rod of its top glue core is cooperatively interacted with the connecting rod of reducing glue core be connected, namely the connecting rod of its top glue core injects in the through hole of the outer end of the main body bar of the connecting rod of reducing glue core.Like this, its top glue core and reducing glue core are attached on variable bore ram body respectively, and Jiao Xin two, top cooperatively interacts with reducing glue core both ends respectively and links together, and forms confined space, thus, form the flashboard assembly of reducing.The diameter of the inner circumferential wall of the arc of the opening sheet of variable bore ram body is greater than the semicircular inwall side face diameter of the inner ring of reducing glue core or is greater than the diameter of semi-ring body of reducing glue core.Variable bore ram body there is box structure, box structure is positioned at the back part of variable bore ram body, box structure matches with the pin thread structure of the outer end of the piston rod of blowout prevention, it is convex straight trough, it is made up of inside groove and water jacket, namely there is convex straight trough in the outside of variable bore ram body, horizontal break-through pedestal, its groove bottom is plane, convex straight trough comprises inside groove and water jacket, the width of its inside groove is greater than the width of water jacket, vertical distance between two groove sides of water jacket is identical with the vertical distance between two groove bottom of two groove structures at the top of the pin thread structure of the outer end of the piston rod of blowout prevention, the width of the groove structure groove bottom of the pin thread structure of the outer end of the piston rod of its blowout prevention is identical with the width of the groove side of the water jacket of the box structure of variable bore ram body, the pin thread structure top plane of the outer end of the piston rod of blowout prevention is identical to the degree of depth of the inside groove of the vertical distance of groove side adjacent with top plane of groove structure and the box structure of variable bore ram body, vertical distance between two side planes of the pin thread structure of the outer end of the piston rod of blowout prevention is equal with the vertical distance between two groove sides of the inside groove of the convex straight trough of the box structure of variable bore ram body.The flashboard assembly of reducing has two, and the flashboard assembly of two reducings complements one another into the flashboard assembly of a set of reducing, and like this, its corresponding top glue core has two, and two top glue cores complement one another into a set of top glue core, its corresponding reducing glue core also has two, and two reducing glue cores complement one another into a set of reducing glue core, and in its a set of reducing glue core, two reducing glue cored structures are identical, variable bore ram body also has two, two a set of variable bore ram bodies of the supporting one-tenth of variable bore ram body, when the flashboard assembly of two reducings docks mutually, the flashboard assembly of two reducings of the flashboard assembly of a set of reducing complements each other to form a unified overall structure, namely in two variable bore ram bodies of a set of variable bore ram body, centering guiding oblique angle on two variable bore ram bodies and centering gathering sill cooperatively interact, its centering guiding oblique angle is made to inject mutually corresponding centering gathering sill, in two reducing glue cores of a set of reducing glue core, having the head of two interfaces and having the head of two guide grooves to cooperatively interact to dock respectively on two reducing glue cores, its stretched head respectively on two reducing glue cores and guide groove, stretch out tail and interface cooperatively interacts, stretched head is made to inject mutually corresponding guide groove, stretch out tail and inject mutually corresponding interface, and in its a set of reducing glue core, the lateral surface being positioned at the special-shaped cam of the same side of each ironware of two reducing glue cores at grade.Variable bore ram slips is the shape and structure of block, variable bore ram slips external surface there is the outerplanar be parallel to each other that two relative arc outer wall faces are relative with two, arc outer wall face is crossing with two outerplanars respectively to be connected, outerplanar is vertical with the middle tangent plane of variable bore ram slips, two outerplanar, one is upper plane, and another is baseplane.Variable bore ram slips comprises hatch frame, box structure, and hatch frame, box structure lay respectively at the front and rear of variable bore ram slips.Box structure is positioned at the rear portion of variable bore ram slips, and box structure is convex slot, and it is made up of inside groove and water jacket, horizontal break-through variable bore ram slips, and its groove bottom is plane, and convex slot comprises inside groove and water jacket, and the width of its inside groove is greater than the width of water jacket.Hatch frame is positioned at the front portion of variable bore ram slips, hatch frame refers to the opening of the centre of the front portion of variable bore ram slips, the inwall of its hatch frame comprises the inwall of three circular arcs, i.e. intermediate inner wall and two side inwalls, two side inwalls are crossing with intermediate inner wall respectively to be connected, two side inwalls lay respectively at intermediate inner wall both sides, namely between its intermediate inner wall between two side inwalls, the inwall of its hatch frame is the combining structure of two side inwalls and an intermediate inner wall, the top layer of the inwall of its hatch frame is slip insert structure, slip insert structure is arranged to form by several slip inserts, slip insert is the pincers tooth of arc, the slip insert structure of its variable bore ram slips comprises three groups of slip insert structures, namely the slip insert structure on the top layer of intermediate inner wall is positioned at, it is referred to as middle slips dental structure, be positioned at the slip insert structure on the top layer of side inwall, it is referred to as side slip insert structure, side slip insert structure has two, two side slip insert structures lay respectively at middle slips dental structure both sides, namely between its middle slip insert structure between two side slip insert structures, the inner circumferential of each slip insert of middle slips dental structure is on same affiliated circular arc side face, the inner circumferential of each slip insert of side slip insert structure is on same affiliated circular arc side face, the internal diameter of the inner circumferential of the slip insert of side slip insert structure is greater than the internal diameter of the inner circumferential of the slip insert of middle slips dental structure, namely the internal diameter of the affiliated circular arc side face of the inner circumferential of the slip insert of side slip insert structure is greater than the internal diameter of the affiliated circular arc side face of the inner circumferential of the slip insert of middle slips dental structure, the affiliated circular arc side face of the inner circumferential of the slip insert of two side slip insert structures and the arc core line of two side inwalls are same straight line, the arc core line of the affiliated circular arc side face of the inner circumferential of the slip insert of intermediate inner wall and middle slips dental structure is same straight line, two arc core lines are parallel to each other, and respectively with the middle tangent plane of variable bore ram slips at grade, two arc core line is vertical with the outerplanar of variable bore ram slips respectively, the arc core line of side inwall is positioned at the front of the arc core line of intermediate inner wall.The columniform oil pipe of its side inwall and thick, the thin two kinds of specifications of intermediate inner wall difference Corresponding matching, namely the columniform oil pipe that side inwall is corresponding thick, the columniform oil pipe that intermediate inner wall is corresponding thin, thick columniform oil pipe is large diameter columniform oil pipe, the columniform oil pipe of thin columniform oil pipe minor diameter.Because there is hatch frame the front portion of variable bore ram slips, the front portion of variable bore ram slips comprises two fronts, two fronts lay respectively at symmetrically variable bore ram slips the both sides of middle tangent plane.The complete pairing of variable bore ram slips, a set of variable bore ram slips has two variable bore ram slips, namely two variable bore ram slips complement one another into a set of variable bore ram slips, in two variable bore ram slips of same set of variable bore ram slips, the fluted structure in front of an one variable bore ram slips, there is male head structure the front of another variable bore ram slips; The variable bore ram slips of its fluted structure is referred to as female variable bore ram slips, and it has the variable bore ram slips of male head structure to be referred to as public variable bore ram slips.The fluted structure in front of female variable bore ram slips, groove structure comprises two grooves, three opening sheets, the top of i.e. front there is the groove of the opening of two transverse directions, its groove comprises groove bottom and groove side, two groove sides are parallel to each other and intersect vertically with groove bottom respectively and are connected, groove bottom is vertical with the outerplanar of female variable bore ram slips, groove bottom is vertical with the middle tangent plane of female variable bore ram slips with groove side, like this, the top of its front is just formed three apart from one another by the structure of opening sheet, its opening sheet of three is respectively upper shed sheet, split shed sheet, bottom opening sheet, the inwall of the opening sheet of three is all a part for side inwall.There is male head structure the front of public variable bore ram slips, and male head structure comprises two males, groove, two unfilled corners, the top of its front has two transverse directions apart from one another by outstanding male, groove is formed between two male and end face, its groove comprises groove bottom and groove side, the side that two of two males are relative is groove side, groove bottom is the part being sandwiched in the end face between two groove sides of connection two groove sides, two groove sides are parallel to each other and intersect vertically with groove bottom respectively and are connected, groove bottom is vertical with the outerplanar of public variable bore ram slips, groove bottom is vertical with the middle tangent plane of public variable bore ram slips with groove side, mutually intersect vertically between the lateral surface of male and end face and form the unfilled corner in outside, lateral surface and groove side are parallel to each other, the male of two is respectively male, lower male, the inwall of two males is all a part for side inwall, thus, the top of its front is just formed two apart from one another by the structure of male, two unfilled corner is respectively unfilled corner and end unfilled corner.When the variable bore ram slips of mother docks mutually with male variable bore ram slips, female variable bore ram slips and male variable bore ram slips complement each other to form a unified overall structure, namely in two variable bore ram slips of a set of variable bore ram slips, the male head structure of the front of male variable bore ram slips cooperatively interacts with the groove structure of the front of female variable bore ram slips and is connected, mutually coincide in two grooves making two males of the male head structure of male variable bore ram slips inject the groove structure of the variable bore ram slips of mutually corresponding mother respectively, simultaneously, the upper shed sheet of the groove structure of female variable bore ram slips, split shed sheet, bottom opening sheet injects the upper unfilled corner of the variable bore ram slips of mutually corresponding public affairs respectively, groove, mutually coincide in end unfilled corner.The reducing oil pipe clamping preventer surged is bilateral symmetry, the male variable bore ram slips of a set of variable bore ram slips and female variable bore ram slips are equipped on hydraulic flashboard slips binding clasp, the variable bore ram slips of male variable bore ram slips and mother is installed in the side through hole of i.e. two of side through hole clampings of a pair clamping of the housing of hydraulic flashboard slips binding clasp respectively, on same a pair left side of housing, male flashboard slips in the side through hole of right clamping complements one another with female variable bore ram slips, relative between two, and in the side through hole of same clamping, mutually coincide in the box structure that the pin thread structure of the piston rod of the clamping of its correspondence injects variable bore ram slips, the variable bore ram slips that two complements one another is a set of variable bore ram slips, and the flashboard assembly of reducing is installed in the side through hole of two of the side through hole of a pair blowout prevention of its hydraulic flashboard blowout preventer blowout preventions respectively, the flashboard assembly of the reducing in the side through hole of same a pair left and right blowout prevention of housing complements one another, relative between two, and in the side through hole of same blowout prevention, the pin thread structure of the piston rod of the blowout prevention of its correspondence to inject in the box structure on the variable bore ram body of the flashboard assembly of reducing and mutually coincide, and the flashboard assembly of two reducing complemented one another is the flashboard assembly of a set of reducing.Port connection is tightly connected the hydraulic oil pipeline of hydraulic system.When the reducing oil pipe clamping preventer sealing oil pipe surged, the left and right cylinder barrel that hydraulic control system hydraulic oil enters the flashboard assembly controlling reducing closes chamber, promote piston-advance and drive the flashboard assembly of left and right reducing to move respectively to well head center along the side through hole of housing, the flashboard assembly of two reducings docks mutually, when tubing diameter is greater than the format diameter of reducing glue core in its natural state, its multiple ironware ends contact is to the surface of oil pipe, create mutual thrust (along oil pipe radial direction) simultaneously, the stressed extruding of ironware is outwards moved, the connector of special-shaped cam structure produces rotary motion simultaneously, inner ring contacts with the appearance of oil pipe and is extruded, when the active force (along oil pipe radial direction) extruded increases to the specification form that can change reducing glue core, reducing glue core is made to produce distortion, realize reducing glue core reducing, thus the annular space closed between oil pipe and sleeve pipe, realize closing Oil/gas Well, when tubing diameter is less than reducing glue core format diameter in its natural state, ironware and rubber are subject to the effect of variable bore ram body simultaneously, extruding is internally moved, oil pipe surface is formed and surrounds extruding, when the active force (along oil pipe radial direction) extruded can change the specification form of reducing glue core, make reducing glue core produce distortion, realize reducing glue core reducing, thus the annular space closed between oil pipe and sleeve pipe, realize closing Oil/gas Well.When hydraulic oil enters cylinder barrel unlatching chamber, left and right, promote piston and retreat and drive the flashboard assembly of reducing to leaving the motion of well head center position, open Oil/gas Well, reducing glue core returns to nature again.The flashboard assembly switch of reducing is controlled by the reversal valve of the hydraulic control unit of hydraulic system.Like this, its a set of reducing glue core can realize the oil pipe closing different specification size; Thus the hydraulic flashboard blowout preventer of its equipment reducing glue core just can realize by a set of reducing glue core the oil pipe closing different specification size.When the reducing oil pipe clamping preventer clamping oil pipe surged, hydraulic control system hydraulic oil enters the left and right cylinder barrel controlling variable bore ram slips and closes chamber, promote piston-advance and drive left and right variable bore ram slips to move respectively to well head center along the side through hole of housing, two variable bore ram slips dock mutually, and two variable bore ram slips are in conjunction with the oil pipe of clamp cylinders shape, when clamped oil pipe is large diameter columniform oil pipe, its male variable bore ram slips touches the surface of large diameter columniform oil pipe with the slip insert of the side slip insert structure of the side inwall of female variable bore ram slips, internal diameter due to the slip insert of the side slip insert structure of side inwall is greater than the internal diameter of the slip insert of the side slip insert structure of intermediate inner wall, the external diameter of large diameter columniform oil pipe is greater than the internal diameter of the slip insert of the middle slips dental structure of intermediate inner wall, thus the slip insert of the middle slips dental structure of intermediate inner wall can not touch the surface of large diameter columniform oil pipe, due to piston thrust forward, make between male variable bore ram slips and the variable bore ram slips of mother, to create mutual thrust (along oil pipe radial direction), thus make male variable bore ram slips and female large diameter columniform oil pipe of the stressed clamping of variable bore ram slips, equally, when clamped oil pipe is the columniform oil pipe of minor diameter, its male variable bore ram slips touches the surface of the columniform oil pipe of minor diameter with the slip insert of the side slip insert structure of the intermediate inner wall of female variable bore ram slips, internal diameter due to the slip insert of the side slip insert structure of side inwall is greater than the internal diameter of the slip insert of the side slip insert structure of intermediate inner wall, the external diameter of the columniform oil pipe of minor diameter is less than the internal diameter of the slip insert of the side slip insert structure of side inwall, thus each slip insert of the side slip insert structure of side inwall can not touch the surface of the columniform oil pipe of minor diameter, the male head structure of the front of male variable bore ram slips cooperatively interacts with the groove structure of the front of female variable bore ram slips and is connected, mutually coincide in two grooves making two males of the male head structure of male variable bore ram slips inject the groove structure of the variable bore ram slips of mutually corresponding mother respectively, simultaneously, the upper shed sheet of the groove structure of female variable bore ram slips, split shed sheet, bottom opening sheet injects the upper unfilled corner of the variable bore ram slips of mutually corresponding public affairs respectively, groove, mutually coincide in end unfilled corner, due to piston thrust forward, make between male variable bore ram slips and the variable bore ram slips of mother, to create mutual thrust (along oil pipe radial direction), thus make the columniform oil pipe of male variable bore ram slips and female variable bore ram slips stressed clamping minor diameter.When hydraulic oil enters cylinder barrel unlatching chamber, left and right, promote piston and retreat and drive variable bore ram slips to leaving the motion of well head center position, unclamp columniform oil pipe.Variable bore ram slips switch is controlled by the reversal valve of the hydraulic control unit of hydraulic system; Like this, just can be clamped two kinds of oil pipes of the oil pipe different specification size of large diameter oil pipe and minor diameter by its a set of variable bore ram slips, realize reducing clamping.Like this, the flashboard assembly of the reducing oil pipe clamping preventer equipment reducing surged and variable bore ram slips; It just can clamp the oil pipe of the column type of thick, thin two kinds of specifications by its a set of variable bore ram slips, realize reducing clamping oil pipe; It can close the oil pipe of different specification size by the flashboard total performance of its a set of reducing, realizes reducing sealing oil pipe; Eliminate the replacing half envelope flashboard assembly of oil pipe clamping preventer and the trouble of flashboard slips, thus reach object of the present invention.

Owing to have employed technique scheme, the reducing oil pipe clamping preventer surged just can clamp the oil pipe of the column type of thick, thin two kinds of specifications by its a set of variable bore ram slips, realizes reducing clamping oil pipe; It can close the oil pipe of different specification size by the flashboard total performance of its a set of reducing, realizes reducing sealing oil pipe; And structure is simple, easy for installation; Drastically increase the labor productivity of workman, stop to produce new potential safety hazard.

Accompanying drawing explanation

Below in conjunction with embodiment, the reducing oil pipe clamping preventer that the present invention is surged is further described.

The structural representation of the reducing oil pipe the surged clamping preventer that the embodiment that the reducing oil pipe surged that accompanying drawing 1 surges for the present invention clamps preventer is surged.

The principle analysis diagram of the variable bore ram slips clamping Big Inch of the reducing oil pipe clamping preventer that the embodiment that the reducing oil pipe that accompanying drawing 2 surges for the present invention clamps preventer is surged.

The principle analysis diagram of the variable bore ram slips clamping little oil pipe of the reducing oil pipe clamping preventer that the embodiment that the reducing oil pipe that accompanying drawing 3 surges for the present invention clamps preventer is surged.

The structural representation of the variable bore ram slips of the mother of the reducing oil pipe clamping preventer that the embodiment that the reducing oil pipe that accompanying drawing 4 surges for the present invention clamps preventer is surged.

The structural representation of the variable bore ram slips of the public affairs of the reducing oil pipe clamping preventer that the embodiment that the reducing oil pipe that accompanying drawing 5 surges for the present invention clamps preventer is surged.

The three-view diagram of the variable bore ram slips of the public affairs of the reducing oil pipe clamping preventer that the embodiment that the reducing oil pipe that accompanying drawing 6 surges for the present invention clamps preventer is surged.

The three-view diagram of the variable bore ram slips of the mother of the reducing oil pipe clamping preventer that the embodiment that the reducing oil pipe that accompanying drawing 7 surges for the present invention clamps preventer is surged.

The structure dissection schematic diagram of the reducing glue core of the reducing oil pipe clamping preventer that the embodiment that the reducing oil pipe that accompanying drawing 8 surges for the present invention clamps preventer is surged.

The structural representation of the reducing glue core of the reducing oil pipe clamping preventer that the embodiment that the reducing oil pipe that accompanying drawing 9 surges for the present invention clamps preventer is surged.

The structural representation of the special-shaped cam of the ironware of the reducing glue core of the reducing oil pipe clamping preventer that the embodiment that the reducing oil pipe that accompanying drawing 10 surges for the present invention clamps preventer is surged.

The overall appearance structural representation of the reducing glue core of the reducing oil pipe clamping preventer that the embodiment that the reducing oil pipe that accompanying drawing 11 surges for the present invention clamps preventer is surged.

The structural representation of the variable bore ram body of the reducing oil pipe clamping preventer that the embodiment that the reducing oil pipe that accompanying drawing 12 surges for the present invention clamps preventer is surged.

In figure: 1, large diameter columniform oil pipe 2, the columniform oil pipe 3 of minor diameter, intermediate inner wall 4, side inwall 5, the box structure 6 of variable bore ram slips, groove structure 7, the groove 8 of the opening of the transverse direction of groove structure, upper shed sheet 9, split shed sheet 10, bottom opening sheet 11, end unfilled corner 12, male head structure 13, the groove 14 formed between two males of male head structure and end face, lower male 15, upper unfilled corner 16, variable bore ram slips 17, upper male 18, female variable bore ram slips 19, public variable bore ram slips 20, the front 21 of female variable bore ram slips, the front 22 of public variable bore ram slips, hydraulic cylinder 23, cylinder cap 24, the piston rod 25 of clamping, screw mandrel 26, cylinder barrel bolt 27, piston 28, cylinder barrel 29, housing 30, side door 31, side door bolt 32, flange arrangement 33, reducing colloid 34, front glue plane 35, interface 36, ironware 37, semi-ring body 38, semicircular inwall side face 39, reducing glue core 40, parallels 41, motion bar 42, connecting rod 43, outer ring 44, rear glue plane 45, the outer end 46 of the main body bar of connecting rod, stretched head 47, stretch out tail 48, the outer wall 49 of the head of special-shaped cam, the lateral surface 50 of special-shaped cam, the shortwall plane 51 of special-shaped cam, the outside wall surface 52 of the arc curve of special-shaped cam, the tail wall plane 53 of special-shaped cam, the longwell plane 54 of special-shaped cam, the medial surface 55 of special-shaped cam, the outside wall surface 56 of " s " shape of the afterbody of special-shaped cam, guide groove 57, variable bore ram body 58, the box structure 59 of variable bore ram body, the blind hole 60 of the connection top glue core in the groove bottom of side seal groove, arc seal groove 61, middle inner face 62 on bottom opening sheet, side inner face 63 on bottom opening sheet, top opening sheet 64, centering gathering sill 65, inner plane 66, the blind hole 67 of the connection reducing glue core on inner plane, side inner face 68 on top opening sheet, the opening 69 of the arc of the anteriomedial of opening sheet, center peripheral wall surfaces 70, water jacket 71, forward plane 72, hatch frame 73, the piston rod 74 of blowout prevention, centering guiding oblique angle 75, top glue core

Detailed description of the invention

The reducing oil pipe clamping preventer surged comprises housing (29), hydraulic cylinder (22), the flashboard assembly of reducing, variable bore ram slips, side door (30), side door bolt (31), port connection, and the reducing oil pipe surged clamping preventer also comprises sealing mechanism, the reducing oil pipe clamping preventer surged is bilateral symmetry, and namely its left side structure is identical with the specification framework of right side structure and symmetrical, housing comprises body and flange arrangement, body is rectangular structure, the center of body is the main through hole of hollow circular configuration, flange arrangement comprises neck flange and flange, housing there are two flange arrangements, two flange arrangements lay respectively at the both sides of body, the intermediate throughholes of two flange arrangement interlinks with main through hole respectively, the center line of flange arrangement (32) and the center line of main through hole are on the same line, housing has four side through hole, side through hole communicates with main through hole respectively, its side through hole combines the structure of formation two pairs of side through hole in pairs, a same side through hole to side through hole is positioned at main through hole side, another side through hole is positioned at main through hole opposite side, the center line of same two side through hole to side through hole on the same line and with the vertical and intersectant centerline of main through hole, two pairs of side through hole lay respectively at the upper and lower layer of housing, and its side through hole being positioned at the upper strata of housing is referred to as the side through hole clamped, its side through hole being positioned at the lower floor of housing is the side through hole of blowout prevention.Hydraulic cylinder comprises cylinder barrel (28) and cylinder cap (23), piston (27) and piston rod, screw mandrel (25) cylinder barrel bolt (26) and sealing device, piston rod is fixedly connected on the side of piston, the outer end of piston rod is pin thread structure, its top is plane, be referred to as to push up plane, the central axis of top plane and piston, the two sides be connected with top plane are plane and side plane, its two side plane respectively with top plane orthogonal, and be parallel to each other, the vertical distance that its two side plane arrives the center line of piston is respectively equal, between side plane with piston rod main body, fluted structure is connected, groove structure open at both ends, its groove structure comprises groove bottom and groove side, its groove bottom is parallel with side plane, its two grooves side is parallel to each other, and it is vertical with groove bottom, the top plane parallel of groove side and piston rod, piston rod there is the blind hole of connection wire rod, the blind hole of connection wire rod and the central through hole of piston interlink, the blind hole of connection wire rod and the central through hole of piston and piston rod, the center line of piston on the same line, internal thread is had in the central through hole of piston and the blind hole of connection wire rod that links together, screw mandrel comprises body and step, body is circular pin, the step of the outwardly annular of intermediate peripheral wall of body, its step separates leading portion and back segment screw mandrel body, the external diameter of leading portion is less than the external diameter of back segment, the leading portion of body there is male thread.Complement one another between the side through hole of hydraulic cylinder, side door and housing, the quantity correspondence of the side through hole of hydraulic cylinder, side door and housing is identical, hydraulic cylinder and being connected between side door and housing.Piston rod comprises the piston rod of clamping and the piston rod of blowout prevention, be connected between the piston rod of variable bore ram slips and corresponding clamping, be connected between the flashboard assembly of reducing and the piston rod of corresponding blowout prevention, hydraulic cylinder and syndeton between side door and housing, namely piston rod packs in the hole in the middle of side door, piston is inserted in cylinder barrel, internal thread in the central through hole of the male thread on the leading portion of the body of screw mandrel and piston and the blind hole of the connection wire rod of piston rod that links together screws and is connected, cylinder cap sealing shroud connects the back segment of the body of screw mandrel, the sealing device of hydraulic cylinder comprises sealing between the back segment of the body of cylinder cap and screw mandrel and the sealing between cylinder cap and cylinder barrel and the sealing between side door and cylinder barrel, sealing between piston rod and side door, sealing between piston rod and side door is divided into two parts, a part is sealed well pressure, a part is the oil pressure that sealing hydraulic control produces, twice sealing mechanism is between this two department, for making the sealing at this place very reliable, there is the sealing ring of multiplet, and the auxiliary seal of middle O-ring seals, side door itself is connected with housing by side door bolt, side door is positioned at outside the side through hole of housing, side door is covered on side through hole, and cylinder cap and cylinder barrel are fixed together by cylinder barrel bolt and side door, and the sealing between side door and cylinder barrel adopts y-shaped ring to realize two way seal.The sealing mechanism of the reducing oil pipe clamping preventer surged comprises the sealing of sealing between side door and housing and oil circuit.The respective independently oil circuit hole of this distribution in vivo many of housing, it independently has a collar extension and two oil circuit apertures in oil circuit hole, collar extension is positioned on this outside, two oil circuit apertures corresponding same two side through hole to side through hole respectively in same independently oil circuit hole, namely two oil circuit apertures in same independently oil circuit hole are distributed in the same outside of a side through hole to side through hole corresponding with it and the outside of another side through hole respectively, the oil circuit aperture in the oil circuit hole of the body of housing and the corresponding connection of oil circuit ostium of side door, the collar extension in the oil circuit hole of the body of its housing is fixedly connected with port connection, there are two oil circuit apertures in the outside of side through hole, and its two oil circuits aperture belongs to two oil circuit holes respectively, and its two oil circuit holes are respectively the oil circuit hole of control piston advance and the oil circuit hole of control piston retrogressing, have an oil circuit hole in cylinder cap body, cylinder cap body is pierced in all side of being connected corresponding to cylinder barrel inside cylinder cap, its oil circuit hole, and passes from the centre inside cylinder cap, cylinder barrel has an oil circuit hole, the oil circuit aperture, all sides in cylinder cap oil circuit hole connects with an oil circuit orifice sealing in the oil circuit hole of cylinder barrel, the oil circuit aperture of the centre of the inner side in the oil circuit hole of cylinder cap is led in cylinder barrel, the oil circuit hole of two break-through side doors is had in its side door, the oil circuit hole advanced with another oil circuit aperture in the oil circuit hole of cylinder barrel and the control piston of housing respectively in the two oil circuit apertures in an oil circuit hole of side door seals and interlinks, and the oil circuit hole that another oil circuit hole of side door and the control piston of housing retreat seals and interlinks and lead in cylinder barrel, each parts are successively installed connection according to program respectively and are completed, and have rubber seal rings for seal to connect, form the oil circuit of independent completion sealing between its oil circuit aperture mutually directly connected.The sealing of oil circuit comprises the sealing of the oil circuit hole collar extension of sealing between the oil circuit aperture that mutually directly connects and port connection and housing.The flashboard assembly of the reducing oil pipe clamping preventer equipment reducing surged and variable bore ram slips.The flashboard assembly of reducing belongs to the one of half envelope flashboard assembly, and the flashboard assembly of reducing comprises gate panel body and the seal of half envelope, and seal comprises top glue core (75), reducing glue core; The gate panel body of half envelope of the flashboard assembly of reducing matches with top glue core, reducing glue core, and the gate panel body of half envelope of the flashboard assembly of its reducing is referred to as variable bore ram body.Reducing glue core (39) is made up of agent structure and external ear, its agent structure is the structure of semi-toroidal shape, left and right two head part of its agent structure protrude the external ear forming symmetrical bulk shape not laterally, thus, the head of its agent structure and external ear are interconnected to form the head of reducing glue core, and reducing glue core has two heads; Reducing glue core comprises reducing colloid (33), ironware (36), parallels (40), motion bar (41), connecting rod (42); Reducing colloid is the carrier of ironware, parallels, motion bar, connecting rod, and ironware, parallels, motion bar, connecting rod are incorporated among reducing colloid respectively.Reducing glue core comprises six ironwares, four parallels, two motion bars and two connecting rods; Reducing glue core is by the disposable sulfuration and become an entirety in mould of six ironwares, four parallels, two motion bars and two connecting rods and rubber.Ironware is the structure of special-shaped cam, ironware is made up of two special-shaped cams and connector, the end of ironware is special-shaped cam, special-shaped cam comprises head, middle part and afterbody, special-shaped cam is the structure of narrow " V " shape leaf lobe shape of head, special-shaped cam has lateral surface (49) and medial surface (54), and lateral surface and the medial surface of special-shaped cam are parallel to each other, the outer wall (48) of the head of special-shaped cam is arc-shaped surface, the outer wall of the head of its special-shaped cam is respectively with the lateral surface of special-shaped cam with medial surface is crossing connects, there are two wall planes be connected that intersect vertically with lateral surface and medial surface respectively at the middle part of special-shaped cam, two wall plane apportion both sides, two wall planes are crossing with the two ends of the outer wall of head respectively to be connected, in two wall planes, the short wall plane of its length is referred to as shortwall plane, the wall plane that its length is long is referred to as longwell plane, the afterbody of special-shaped cam is convex-concave curved configuration, the afterbody of special-shaped cam comprises the outside wall surface (55) of " s " shape, the outside wall surface (51) of arc curve and tail wall plane (52), the outside wall surface of " s " shape, the outside wall surface of arc curve and tail wall plane are respectively with the lateral surface of special-shaped cam with medial surface is crossing is connected, one end of the outside wall surface of " s " shape connects longwell plane (53), the other end of the outside wall surface of " s " shape connects tail wall plane, one end of the outside wall surface of arc connects shortwall plane (50), the other end of the outside wall surface of arc connects tail wall plane, like this, tail wall interplanar is in the outside wall surface of " s " shape, between the outside wall surface of arc, and respectively with the outside wall surface of " s " shape, the outside wall surface of arc curve intersects and connects, the inner side being positioned at the affiliated plane of longwell plane of the outside wall surface of " s " shape, the protrusion of the outside wall surface of arc curve and be positioned at the outside of the affiliated plane of shortwall plane, like this, the interior angle of the affiliated plane of tail wall plane and the affiliated Plane intersects of shortwall plane is obtuse angle, and the interior angle of the affiliated plane of tail wall plane and the affiliated Plane intersects of longwell plane is acute angle, connector is flat bar structure, and connector has two lateral surfaces and two arc surfaces, and two lateral surfaces of connector are parallel to each other, and lateral surface is between two arc surfaces, and arc surface is crossing with two lateral surfaces respectively to be connected, connector two connects special-shaped cam respectively, the medial surface of special-shaped cam intersects with connector and is vertically connected, two lateral surfaces of the center line difference connector of its connector are parallel and vertical with medial surface with the lateral surface of special-shaped cam, and two special-shaped cams be positioned at respectively symmetrically connector two outside, an arc surface of connector and the head of special-shaped cam are in the same side, and another arc surface of connector and the afterbody of special-shaped cam are in the same side.Reducing glue core has six ironwares, six ironwares are incorporated among reducing colloid respectively, six ironwares are spaced, evenly forward, ordered arrangement, the center line of the connector of its each ironware is parallel to each other and respectively on same circular arc, spacing distance between the center line of the connector of each ironware is identical, the lateral surface being positioned at the special-shaped cam of the same side of its each ironware at grade, the medial surface being positioned at the special-shaped cam of the same side of each ironware at grade, thus the assembly of the frame construction of six ironware formation semi-ring forms, assembly belongs to a part for reducing glue core agent structure, two special-shaped cams of same ironware lay respectively at the skin of the both sides of reducing glue core agent structure.It is inner that its ironware is longitudinally erected in reducing colloid, the head of the special-shaped cam of ironware is positioned at inner side, the afterbody of the special-shaped cam of ironware is positioned at outside, the head of ironware does not point to the arc core line of the circular arc at the center line place of the connector of each ironware, arc core line refer to the circular arc at the center line place of the connector through its ironware arc core and respectively with the center line of the centerline parallel of the connector of each ironware, ironware is tiltedly to its arc core line, and the head of the special-shaped cam of ironware refers to the side of arc core line partially; Interval between the head of the special-shaped cam of its six ironwares is identical, and equally, the interval between the afterbody of the special-shaped cam of its six ironwares is identical.Parallels is rectangle structure, and there is through hole the centre of parallels, and its through hole has two relative inwall side planes be parallel to each other and two relative arc inner wall faces, and relative with two the respectively inwall side plane be parallel to each other in arc inner wall face is crossing to be connected; Motion bar is columniform bar, and it comprises mobile jib and bar head, and bar head has two, mobile jib two ends are connecting-rod cap respectively, mobile jib and bar head are respectively cylindrical shape, and the diameter of mobile jib is greater than the diameter of bar head, and the center line of mobile jib and bar head and motion bar on the same line.Connecting rod is interconnected to constitute by main body bar and major part, main body bar is cylindrical shape, there is through hole the outer end of the main body bar of its connecting rod, its through hole has two relative inwall side planes be parallel to each other and two relative arc inner wall faces, and relative with two the respectively inwall side plane be parallel to each other in arc inner wall face is crossing to be connected; Major part there are a medial plane and breach, its medial plane is parallel with the inwall side plane of the through hole of main body bar, its breach is the opening of the shape of arc side face, and the arc core line of the arc side face of its breach is parallel with medial plane, its arc core line and main body bar central axis.The glue plane that the head of reducing glue core has two to be parallel to each other, wherein, a glue plane is front glue plane (34) before head, another glue plane back side after head is rear glue plane (44), the front glue plane of two heads of reducing glue core at grade, its place plane is vertical with the longitudinally middle tangent plane of reducing glue core, and the rear glue plane of two heads of reducing glue core at grade.Its motion bar is longitudinally erected in the inside of the head of reducing glue core, and be erected in the outside of assembly, the center line of the center line of motion bar and the connector of ironware is parallel to each other, the bar head of motion bar one end puts in the through hole of a parallels, the bar head of the motion bar other end puts in the through hole of another parallels, be connected between its motion bar and parallels, the center line of motion bar is vertical with the lateral surface of two parallels respectively, motion bar and connecting rod are interconnected, connecting rod links the mobile jib of motion bar by the breach on its major part, make the center line of main body bar and the central axis of motion bar of connecting rod, and the center line of the main body bar of connecting rod divides the vertical distance of the lateral surface being clipped to two parallels equal, the outer end (45) of the main body bar of connecting rod stretches out reducing colloid (33) backward, namely the rear glue plane of the head of reducing glue core is stretched out, thus, its motion bar and two parallels be directly connected with its motion bar, connecting rod forms a grip assembly, one head of its reducing glue core comprises a grip assembly, and another head of its reducing glue core comprises another set of assembly, it is positioned at the lateral surface of two parallels of the same side of reducing glue core at grade, the center line of the main body bar of two connecting rod is parallel to each other, and the center line of the main body bar of two connecting rods divides the vertical distance of the longitudinally middle tangent plane being clipped to reducing glue core equal.The agent structure of reducing glue core comprises the outer ring (43) of arc and semicircular inner ring, glue plane after connection two is intersected in outer ring, inner ring intersects the front glue plane of connection two, the arc core line of the arc core line of outer ring and the arc core line of inner ring and assembly is same straight line, and its arc core line is in plane belonging to the longitudinally middle tangent plane of reducing glue core; Its inner ring is sandwiched between the affiliated plane of the medial surface of two special-shaped cams of same ironware, and in the middle of inner ring is longitudinal, the longitudinally middle tangent plane of tangent plane and reducing glue core is same plane.The inner ring of the agent structure of reducing glue core adopts the structure of semi-ring body, the structure of semi-ring body comprises semicircular inwall side face and semi-ring body, semi-ring body (37) connects and is positioned at the middle part of semicircular inwall side face (38), the semicircular inwall side face that semi-ring body is inwardly outstanding, and each special-shaped cam inwardly giving prominence to assembly.Two heads of reducing glue core, one for there being the head of two interfaces, one for there being the head of two guide grooves; At the head having two interfaces of reducing glue core, two special-shaped cams of the ironware of one end of its assembly stretch out corresponding front glue plane respectively, the part of stretching out front glue plane of its special-shaped cam is a part for the head of its special-shaped cam, the part of stretching out front glue plane of its special-shaped cam is referred to as stretched head (46), stretched head is two, and the interface (35) of the head of its reducing glue core is in front glue plane; At the head having two guide grooves of reducing glue core, two special-shaped cams of the ironware of the other end of its assembly stretch out its front glue plane corresponding respectively, the part of stretching out front glue plane of its special-shaped cam is a part for the afterbody of its special-shaped cam, two special-shaped cams of the ironware of this end of its assembly respectively and produce the breach of two dihedrals between inner ring and front glue plane, its breach is guide groove (56), the part of stretching out front glue plane of the special-shaped cam of this end of its assembly is referred to as to stretch out tail (47), and stretching out tail is two; Its semi-ring body inwardly gives prominence to each special-shaped cam of assembly, its semi-ring body is sandwiched between the affiliated plane of the medial surface of two special-shaped cams of same ironware, semi-ring body longitudinally in the middle of tangent plane and reducing glue core longitudinally in the middle of tangent plane be same plane, the head of two special-shaped cams of each ironware of assembly whole and the part at middle part that is inconjunction with thereof are respectively to the interior inwall side face tiltedly stretching out inner ring; Parallels protrudes the agent structure of reducing glue core, be positioned at the outside of the affiliated plane of the lateral surface of special-shaped cam, interlaced between the special-shaped cam of parallels and the ironware in the head of reducing glue core, partially overlap, its parallels is positioned at the skin of the head of reducing glue core, and connect the head of the agent structure of reducing glue core, parallels belongs to a part for external ear.Variable bore ram body (57) complements one another with seal and is connected.Variable bore ram body there is hatch frame, hatch frame (72) is positioned at the front portion of variable bore ram body, hatch frame and reducing glue core adapt to, match, hatch frame comprises two opening sheets, the anteriomedial of opening sheet has the opening of arc, its opening both sides are respectively forward plane, two forward plane is crossing with the inner circumferential wall of the opening (68) of the arc of the anteriomedial of opening sheet respectively to be connected, two forward plane at grade, the arc core line of the inner circumferential wall of opening and the middle tangent plane of variable bore ram body are at grade, forward plane (71) is mutually vertical with the middle tangent plane of variable bore ram body, opening sheet has middle inner face and two side inner faces, two side inner faces lay respectively at the both sides of middle inner face, two side inner faces at grade, middle inner face is parallel with side inner face, middle inner face is mutually vertical with the arc core line of the inner circumferential wall of opening, middle inner face protrudes from side inner face, thus connected by side between its middle inner face and side inner face, its side is vertical with side inner face with middle inner face to be respectively connected, two opening sheets are respectively top opening sheet (63) and bottom opening sheet, the middle inner face of top opening sheet is relative with the middle inner face (61) of bottom opening sheet and be parallel to each other, the side inner face (67) of top opening sheet is relative with the side inner face (62) of bottom opening sheet and be parallel to each other, and the arc core line of the inner circumferential wall of the opening of two opening sheets on the same line, the inner circumferential wall of arc is had to connect between the middle inner face of two opening sheets, the inner circumferential wall of its arc is referred to as center peripheral wall surfaces, the arc core line of the arc core line of its center peripheral wall surfaces and the inner circumferential wall of opening on the same line, the diameter of its center peripheral wall surfaces is greater than the diameter of the inner circumferential wall of opening, center peripheral wall surfaces (69) is crossing with the middle inner face of two opening sheets respectively to be connected, there is inner plane the both sides of center peripheral wall surfaces respectively, two inner planes at grade, inner plane is parallel with forward plane, inner plane is crossing with center peripheral wall surfaces to be connected, be connected by interior lead angle between inner plane with side inner face, arc seal groove (60) is arranged at the top of variable bore ram body, arc seal groove comprises intermediate seal groove and side seal groove, two side seal grooves lay respectively at the both sides of intermediate seal groove, intermediate seal groove is connected with both sides sealing groove respectively, the degree of depth of intermediate seal groove is less than the degree of depth of side seal groove, the groove bottom of intermediate seal groove is parallel with the groove bottom of side seal groove, the groove bottom of intermediate seal groove is parallel with middle inner face, the groove bottom of side seal groove intersects vertically with inner plane and is connected, the vertical distance of the side inner face that the vertical distance of the groove bottom of the side seal groove side inner face of opening sheet is on earth the less than top opening sheet side inner face of opening sheet on earth, make the groove bottom of side seal groove, a breach is formed between the side inner face of inner plane and top opening sheet, inner plane (65) has the blind hole (66) connecting reducing glue core, its blind hole center line is vertical with inner plane, the groove bottom of side seal groove has the blind hole (59) connecting top glue core, and its blind hole center line is vertical with the groove bottom of side seal groove, and two blind holes intersections communicate, the bottom opening sheet of variable bore ram body there are centering guiding oblique angle (74) and centering gathering sill, bottom opening sheet has the water jacket (70) connecting centering guiding oblique angle, centering guiding oblique angle is fixedly connected on the water jacket at connection centering guiding oblique angle, and the fixed connection structure of centering guiding oblique angle and water jacket adopts headless screw syndeton, its bottom opening sheet there are two through holes, the center line of its through hole is vertical with the middle inner face on bottom opening sheet, two through hole communicates with water jacket respectively, its through hole is female thread structure, there are two internal thread holes matching corresponding with the through hole of two on bottom opening sheet at oblique angle to centering guiding, be fastenedly connected bottom opening sheet and centering guiding oblique angle respectively by headless screw, centering guiding oblique angle is fixedly connected on water jacket.Like this, reducing glue core cooperatively interacts with variable bore ram body and is connected, its reducing glue core pressure is sandwiched between the top opening sheet of the hatch frame of variable bore ram body and bottom opening sheet, and the main body bar that the connecting rod of reducing colloid is stretched out in the outer end of the main body bar of the connecting rod of reducing glue core namely injects in the blind hole of connection reducing glue core of variable bore ram body completely; Top glue core pressure is embedding to be sandwiched in the arc seal groove at the top of variable bore ram body, and the connecting rod stretching out the top colloid of top glue core of its top glue core injects in the blind hole of connection top glue core of variable bore ram body completely; The connecting rod of its top glue core is cooperatively interacted with the connecting rod of reducing glue core be connected, namely the connecting rod of its top glue core injects in the through hole of the outer end of the main body bar of the connecting rod of reducing glue core.Like this, its top glue core and reducing glue core are attached on variable bore ram body respectively, and Jiao Xin two, top cooperatively interacts with reducing glue core both ends respectively and links together, and forms confined space, thus, form the flashboard assembly of reducing.The diameter of the inner circumferential wall of the arc of the opening sheet of variable bore ram body is greater than the diameter of the semi-ring body of reducing glue core.Variable bore ram body there is box structure, box structure (58) is positioned at the back part of variable bore ram body, box structure matches with the pin thread structure of the outer end of the piston rod of blowout prevention, it is convex straight trough, it is made up of inside groove and water jacket, namely there is convex straight trough in the outside of variable bore ram body, horizontal break-through pedestal, its groove bottom is plane, convex straight trough comprises inside groove and water jacket, the width of its inside groove is greater than the width of water jacket, vertical distance between two groove sides of water jacket is identical with the vertical distance between two groove bottom of two groove structures at the top of the pin thread structure of the outer end of the piston rod of blowout prevention, the width of the groove structure groove bottom of the pin thread structure of the outer end of the piston rod of its blowout prevention is identical with the width of the groove side of the water jacket of the box structure of variable bore ram body, the pin thread structure top plane of the outer end of the piston rod of blowout prevention is identical to the degree of depth of the inside groove of the vertical distance of groove side adjacent with top plane of groove structure and the box structure of variable bore ram body, vertical distance between two side planes of the pin thread structure of the outer end of the piston rod of blowout prevention is equal with the vertical distance between two groove sides of the inside groove of the convex straight trough of the box structure of variable bore ram body.The flashboard assembly of reducing has two, and the flashboard assembly of two reducings complements one another into the flashboard assembly of a set of reducing, and like this, its corresponding top glue core has two, and two top glue cores complement one another into a set of top glue core, its corresponding reducing glue core also has two, and two reducing glue cores complement one another into a set of reducing glue core, and in its a set of reducing glue core, two reducing glue cored structures are identical, variable bore ram body also has two, two a set of variable bore ram bodies of the supporting one-tenth of variable bore ram body, when the flashboard assembly of two reducings docks mutually, the flashboard assembly of two reducings of the flashboard assembly of a set of reducing complements each other to form a unified overall structure, namely in two variable bore ram bodies of a set of variable bore ram body, centering guiding oblique angle on two variable bore ram bodies and centering gathering sill (64) cooperatively interact, its centering guiding oblique angle is made to inject mutually corresponding centering gathering sill, in two reducing glue cores of a set of reducing glue core, having the head of two interfaces and having the head of two guide grooves to cooperatively interact to dock respectively on two reducing glue cores, its stretched head respectively on two reducing glue cores and guide groove, stretch out tail and interface cooperatively interacts, stretched head is made to inject mutually corresponding guide groove, stretch out tail and inject mutually corresponding interface, and in its a set of reducing glue core, the lateral surface being positioned at the special-shaped cam of the same side of each ironware of two reducing glue cores at grade.Variable bore ram slips is the shape and structure of block, variable bore ram slips (16) external surface there is the outerplanar be parallel to each other that two relative arc outer wall faces are relative with two, arc outer wall face is crossing with two outerplanars respectively to be connected, outerplanar is vertical with the middle tangent plane of variable bore ram slips, two outerplanar, one is upper plane, and another is baseplane.Variable bore ram slips comprises hatch frame, box structure (5), and hatch frame, box structure lay respectively at the front and rear of variable bore ram slips.Box structure is positioned at the rear portion of variable bore ram slips, and box structure is convex slot, and it is made up of inside groove and water jacket, horizontal break-through variable bore ram slips, and its groove bottom is plane, and convex slot comprises inside groove and water jacket, and the width of its inside groove is greater than the width of water jacket.Hatch frame is positioned at the front portion of variable bore ram slips, hatch frame refers to the opening of the centre of the front portion of variable bore ram slips, the inwall of its hatch frame comprises the inwall of three circular arcs, i.e. intermediate inner wall (3) and two side inwalls, two side inwalls are crossing with intermediate inner wall respectively to be connected, two side inwalls lay respectively at intermediate inner wall both sides, namely between its intermediate inner wall between two side inwalls, the inwall of its hatch frame is the combining structure of two side inwalls and an intermediate inner wall, the top layer of the inwall of its hatch frame is slip insert structure, slip insert structure is arranged to form by several slip inserts, slip insert is the pincers tooth of arc, the slip insert structure of its variable bore ram slips comprises three groups of slip insert structures, namely the slip insert structure on the top layer of intermediate inner wall is positioned at, it is referred to as middle slips dental structure, be positioned at the slip insert structure on the top layer of side inwall (4), it is referred to as side slip insert structure, side slip insert structure has two, two side slip insert structures lay respectively at middle slips dental structure both sides, namely between its middle slip insert structure between two side slip insert structures, the inner circumferential of each slip insert of middle slips dental structure is on same affiliated circular arc side face, the inner circumferential of each slip insert of side slip insert structure is on same affiliated circular arc side face, the internal diameter of the inner circumferential of the slip insert of side slip insert structure is greater than the internal diameter of the inner circumferential of the slip insert of middle slips dental structure, namely the internal diameter of the affiliated circular arc side face of the inner circumferential of the slip insert of side slip insert structure is greater than the internal diameter of the affiliated circular arc side face of the inner circumferential of the slip insert of middle slips dental structure, the affiliated circular arc side face of the inner circumferential of the slip insert of two side slip insert structures and the arc core line of two side inwalls are same straight line, the arc core line of the affiliated circular arc side face of the inner circumferential of the slip insert of intermediate inner wall and middle slips dental structure is same straight line, two arc core lines are parallel to each other, and respectively with the middle tangent plane of variable bore ram slips at grade, two arc core line is vertical with the outerplanar of variable bore ram slips respectively, the arc core line of side inwall is positioned at the front of the arc core line of intermediate inner wall.The columniform oil pipe of its side inwall and thick, the thin two kinds of specifications of intermediate inner wall difference Corresponding matching, namely the corresponding thin columniform oil pipe of the columniform oil pipe that side inwall is corresponding thick, intermediate inner wall, thick columniform oil pipe is large diameter columniform oil pipe, the columniform oil pipe of thin columniform oil pipe minor diameter.Because there is hatch frame the front portion of variable bore ram slips, the front portion of variable bore ram slips comprises two fronts, two fronts lay respectively at symmetrically variable bore ram slips the both sides of middle tangent plane.The complete pairing of variable bore ram slips, a set of variable bore ram slips has two variable bore ram slips, namely two variable bore ram slips complement one another into a set of variable bore ram slips, in two variable bore ram slips of same set of variable bore ram slips, the fluted structure in front of an one variable bore ram slips, there is male head structure the front of another variable bore ram slips; The variable bore ram slips of its fluted structure is referred to as female variable bore ram slips (18), and it has the variable bore ram slips of male head structure to be referred to as public variable bore ram slips (19).Front (20) the fluted structure of female variable bore ram slips, groove structure (6) comprises two grooves, three opening sheets, the top of i.e. front there is the groove of the opening of two transverse directions, its groove (7) comprises groove bottom and groove side, two groove sides are parallel to each other and intersect vertically with groove bottom respectively and are connected, groove bottom is vertical with the outerplanar of female variable bore ram slips, groove bottom is vertical with the middle tangent plane of female variable bore ram slips with groove side, like this, the top of its front is just formed three apart from one another by the structure of opening sheet, its opening sheet of three is respectively upper shed sheet (8), split shed sheet (9), bottom opening sheet (10), the inwall of the opening sheet of three is all a part for side inwall.There is male head structure the front (21) of public variable bore ram slips, and male head structure (12) comprises two males, groove, two unfilled corners, the top of its front has two transverse directions apart from one another by outstanding male, groove is formed between two male and end face, its groove (13) comprises groove bottom and groove side, the side that two of two males are relative is groove side, groove bottom is the part being sandwiched in the end face between two groove sides of connection two groove sides, two groove sides are parallel to each other and intersect vertically with groove bottom respectively and are connected, groove bottom is vertical with the outerplanar of public variable bore ram slips, groove bottom is vertical with the middle tangent plane of public variable bore ram slips with groove side, mutually intersect vertically between the lateral surface of male and end face and form the unfilled corner in outside, lateral surface and groove side are parallel to each other, the male of two is respectively male (17), lower male (14), the inwall of two males is all a part for side inwall, thus, the top of its front is just formed two apart from one another by the structure of male, two unfilled corner is respectively unfilled corner (15) and end unfilled corner (11).When the variable bore ram slips of mother docks mutually with male variable bore ram slips, female variable bore ram slips and male variable bore ram slips complement each other to form a unified overall structure, namely in two variable bore ram slips of a set of variable bore ram slips, the male head structure of the front of male variable bore ram slips cooperatively interacts with the groove structure of the front of female variable bore ram slips and is connected, mutually coincide in two grooves making two males of the male head structure of male variable bore ram slips inject the groove structure of the variable bore ram slips of mutually corresponding mother respectively, simultaneously, the upper shed sheet of the groove structure of female variable bore ram slips, split shed sheet, bottom opening sheet injects the upper unfilled corner of the variable bore ram slips of mutually corresponding public affairs respectively, groove, mutually coincide in end unfilled corner.The reducing oil pipe clamping preventer surged is bilateral symmetry, the male variable bore ram slips of a set of variable bore ram slips and female variable bore ram slips are equipped on hydraulic flashboard slips binding clasp, the variable bore ram slips of male variable bore ram slips and mother is installed in the side through hole of i.e. two of side through hole clampings of a pair clamping of the housing of hydraulic flashboard slips binding clasp respectively, on same a pair left side of housing, male flashboard slips in the side through hole of right clamping complements one another with female variable bore ram slips, relative between two, and in the side through hole of same clamping, mutually coincide in the box structure that the pin thread structure of the piston rod (24) of the clamping of its correspondence injects variable bore ram slips, the variable bore ram slips that two complements one another is a set of variable bore ram slips, and the flashboard assembly of reducing is installed in the side through hole of two of the side through hole of a pair blowout prevention of its hydraulic flashboard blowout preventer blowout preventions respectively, the flashboard assembly of the reducing in the side through hole of same a pair left and right blowout prevention of housing complements one another, relative between two, and in the side through hole of same blowout prevention, the pin thread structure of the piston rod (73) of the blowout prevention of its correspondence to inject in the box structure on the variable bore ram body of the flashboard assembly of reducing and mutually coincide, and the flashboard assembly of two reducing complemented one another is the flashboard assembly of a set of reducing.Port connection is tightly connected the hydraulic oil pipeline of hydraulic system.When the reducing oil pipe clamping preventer sealing oil pipe surged, the left and right cylinder barrel that hydraulic control system hydraulic oil enters the flashboard assembly controlling reducing closes chamber, promote piston-advance and drive the flashboard assembly of left and right reducing to move respectively to well head center along the side through hole of housing, the flashboard assembly of two reducings docks mutually, when tubing diameter is greater than the format diameter of reducing glue core in its natural state, its multiple ironware ends contact is to the surface of oil pipe, create mutual thrust simultaneously, the stressed extruding of ironware is outwards moved, the connector of special-shaped cam structure produces rotary motion simultaneously, inner ring contacts with the appearance of oil pipe and is extruded, when the active force extruded increases to the specification form that can change reducing glue core, reducing glue core is made to produce distortion, realize reducing glue core reducing, thus the annular space closed between oil pipe and sleeve pipe, realize closing Oil/gas Well, when tubing diameter is less than reducing glue core format diameter in its natural state, ironware and rubber are subject to the effect of variable bore ram body simultaneously, extruding is internally moved, oil pipe surface is formed and surrounds extruding, when the active force extruded can change the specification form of reducing glue core, make reducing glue core produce distortion, realize reducing glue core reducing, thus the annular space closed between oil pipe and sleeve pipe, realize closing Oil/gas Well.When hydraulic oil enters cylinder barrel unlatching chamber, left and right, promote piston and retreat and drive the flashboard assembly of reducing to leaving the motion of well head center position, open Oil/gas Well, reducing glue core returns to nature again.The flashboard assembly switch of reducing is controlled by the reversal valve of the hydraulic control unit of hydraulic system.Like this, its a set of reducing glue core can realize the oil pipe closing different specification size; Thus the hydraulic flashboard blowout preventer of its equipment reducing glue core just can realize by a set of reducing glue core the oil pipe closing different specification size.When the reducing oil pipe clamping preventer clamping oil pipe surged, hydraulic control system hydraulic oil enters the left and right cylinder barrel controlling variable bore ram slips and closes chamber, promote piston-advance and drive left and right variable bore ram slips to move respectively to well head center along the side through hole of housing, two variable bore ram slips dock mutually, and two variable bore ram slips are in conjunction with the oil pipe of clamp cylinders shape, when clamped oil pipe is large diameter columniform oil pipe, its male variable bore ram slips touches the surface of large diameter columniform oil pipe (1) with the slip insert of the side slip insert structure of the side inwall of female variable bore ram slips, internal diameter due to the slip insert of the side slip insert structure of side inwall is greater than the internal diameter of the slip insert of the side slip insert structure of intermediate inner wall, the external diameter of large diameter columniform oil pipe is greater than the internal diameter of the slip insert of the middle slips dental structure of intermediate inner wall, thus the slip insert of the middle slips dental structure of intermediate inner wall can not touch the surface of large diameter columniform oil pipe, due to piston thrust forward, make to create mutual thrust between male variable bore ram slips and the variable bore ram slips of mother, thus make male variable bore ram slips and female large diameter columniform oil pipe of the stressed clamping of variable bore ram slips.Equally, when clamped oil pipe is the columniform oil pipe of minor diameter, its male variable bore ram slips touches the surface of the columniform oil pipe (2) of minor diameter with the slip insert of the side slip insert structure of the intermediate inner wall of female variable bore ram slips, internal diameter because of the slip insert of the side slip insert structure of side inwall is greater than the internal diameter of the slip insert of the side slip insert structure of intermediate inner wall, the external diameter of the columniform oil pipe of minor diameter is less than the internal diameter of the slip insert of the side slip insert structure of side inwall, thus each slip insert of the side slip insert structure of side inwall can not touch the surface of the columniform oil pipe of minor diameter, the male head structure of the front of male variable bore ram slips cooperatively interacts with the groove structure of the front of female variable bore ram slips and is connected, mutually coincide in two grooves making two males of the male head structure of male variable bore ram slips inject the groove structure of the variable bore ram slips of mutually corresponding mother respectively, simultaneously, the upper shed sheet of the groove structure of female variable bore ram slips, split shed sheet, bottom opening sheet injects the upper unfilled corner of the variable bore ram slips of mutually corresponding public affairs respectively, groove, mutually coincide in end unfilled corner, due to piston thrust forward, make to create mutual thrust between male variable bore ram slips and the variable bore ram slips of mother, thus make the columniform oil pipe of male variable bore ram slips and female variable bore ram slips stressed clamping minor diameter.When hydraulic oil enters cylinder barrel unlatching chamber, left and right, promote piston and retreat and drive variable bore ram slips to leaving the motion of well head center position, unclamp columniform oil pipe.Variable bore ram slips switch is controlled by the reversal valve of the hydraulic control unit of hydraulic system; Just can be clamped two kinds of oil pipes of the oil pipe different specification size of large diameter oil pipe and minor diameter like this by its a set of variable bore ram slips, realize reducing clamping.

Claims (8)

1. the reducing oil pipe clamping preventer surging, it is the well controlled blowout-proof device that oilfield downhole operation uses, and it adopts hydraulic-driven, and be a kind of oil pipe clamping preventer, be also the utensil of the clamping oil pipe that oilfield downhole operation uses simultaneously, the reducing oil pipe clamping preventer surging comprises flashboard assembly, variable bore ram slips, side door, side door bolt, the port connection of housing, hydraulic cylinder, reducing, and the reducing oil pipe surging clamping preventer also comprises sealing mechanism, the reducing oil pipe clamping preventer surging is bilateral symmetry, and namely its left side structure is identical and symmetrical with the specification framework of right side structure, housing comprises body and flange arrangement, body is rectangular structure, the center of body is the main through hole of hollow circular configuration, flange arrangement comprises neck flange and ring flange, housing there are two flange arrangements, two flange arrangements lay respectively at the both sides of body, the intermediate throughholes of two flange arrangement interlinks with main through hole respectively, the center line of flange arrangement and the center line of main through hole are on the same line, housing has four side through hole, side through hole communicates with main through hole respectively, its side through hole combines the structure that forms two pairs of side through hole in pairs, a same side through hole to side through hole is positioned at main through hole side, another side through hole is positioned at main through hole opposite side, the center line of same two side through hole to side through hole on the same line and with the vertical and intersectant centerline of main through hole, the two pairs of side through hole lay respectively at the upper and lower layer of housing, and its side through hole on upper strata that is positioned at housing is referred to as the side through hole of clamping, the side through hole that its side through hole of lower floor that is positioned at housing is blowout prevention, hydraulic cylinder comprises cylinder barrel and cylinder cap, piston and piston rod, screw mandrel, cylinder barrel bolt and sealing device, piston rod is fixedly connected on the side of piston, the outer end of piston rod is pin thread structure, its top is plane, be referred to as top plane, the central axis of top plane and piston, the two sides that are connected with top plane are plane i.e. side plane, its two side plane respectively with top plane orthogonal, and be parallel to each other, the vertical range of center line that its two side plane arrives respectively piston is equal, between side plane and piston rod main body, fluted structure is connected, groove structure open at both ends, its groove structure comprises groove bottom and groove side, its groove bottom is parallel with side plane, its two grooves side is parallel to each other, and vertical with groove bottom, groove side is parallel with the top plane of piston rod, piston rod there is the blind hole of connection wire rod, the blind hole of connection wire rod and the central through hole of piston interlink, the blind hole of connection wire rod and the central through hole of piston and piston rod, the center line of piston on the same line, internal thread is had in the blind hole of the central through hole of piston and the connection wire rod linking together, screw mandrel comprises body and step, body is circular pin, the step of the outwardly annular of intermediate peripheral wall of body, its step separates leading portion and back segment screw mandrel body, the external diameter of leading portion is less than the external diameter of back segment, the leading portion of body there is male thread, between the side through hole of hydraulic cylinder, side door and housing, complement one another, the quantity correspondence of the side through hole of hydraulic cylinder, side door and housing is identical, between hydraulic cylinder and side door and housing, is connected, piston rod comprises the piston rod of clamping and the piston rod of blowout prevention, between variable bore ram slips and the piston rod of corresponding clamping, is connected,Between the piston rod of the flashboard assembly of reducing and corresponding blowout prevention, be connected, syndeton between hydraulic cylinder and side door and housing, namely piston rod packs in the middle hole of side door, piston is inserted in cylinder barrel, internal thread in the blind hole of the connection wire rod of the male thread on the leading portion of the body of screw mandrel and the central through hole of piston and the piston rod that links together screws and is connected, cylinder cap sealing shroud connects the back segment of the body of screw mandrel, the sealing device of hydraulic cylinder comprises the sealing between the back segment of body of cylinder cap and screw mandrel and the sealing between cylinder cap and cylinder barrel and the sealing between side door and cylinder barrel, sealing between piston rod and side door, sealing between piston rod and side door is divided into two parts, a part is sealed well pressure, a part is the oil pressure that sealing hydraulic control produces, twice sealing mechanism is between Zhe Liang department, for making the sealing at this place very reliable, there is the sealing ring of multiplet, and the auxiliary seal of middle O-ring seals, side door itself is connected with housing by side door bolt, side door is positioned at the side through hole outside of housing, side door is covered on side through hole, and cylinder cap and cylinder barrel are fixed together by cylinder barrel bolt and side door, and the sealing between side door and cylinder barrel adopts y-shaped ring to realize two way seal, the sealing mechanism of the reducing oil pipe clamping preventer surging comprises sealing between side door and housing and the sealing of oil circuit, many of this distribution in vivo of housing oil circuit hole independently separately, there are a collar extension and two oil circuit apertures in its oil circuit hole independently, collar extension is positioned on this outside, two oil circuit apertures corresponding same two side through hole to side through hole respectively in same independently oil circuit hole, be that two oil circuit apertures in same independently oil circuit hole are distributed in respectively the outside of a same side through hole to side through hole corresponding with it and the outside of another side through hole, the oil circuit aperture in the oil circuit hole of the body of housing and the corresponding connection of oil circuit ostium of side door, the collar extension in the oil circuit hole of the body of its housing is fixedly connected with port connection, there are two oil circuit apertures in the outside of side through hole, and its two oil circuits aperture belongs to respectively two oil circuit holes, and its two oil circuit holes are respectively the oil circuit hole that oil circuit hole that control piston advances and control piston retreat, in cylinder cap body, have an oil circuit hole, cylinder cap body is pierced into from all sides that are connected corresponding to cylinder barrel, cylinder cap inner side in its oil circuit hole, and passes from the centre of cylinder cap inner side, cylinder barrel has an oil circuit hole, the one oil circuit orifice sealing in the oil circuit aperture, all sides in cylinder cap oil circuit hole and the oil circuit hole of cylinder barrel joins, the oil circuit aperture of the centre of the inner side in the oil circuit hole of cylinder cap is led in cylinder barrel, the oil circuit hole of two break-through side doors is had in its side door, the two oil circuit apertures in an oil circuit hole of side door interlink with the oil circuit hole sealing that another oil circuit aperture in oil circuit hole and the control piston of housing of cylinder barrel advances respectively, and the oil circuit hole that another oil circuit hole of side door and the control piston of housing retreat seals and interlinks and lead in cylinder barrel, each parts are successively installed connection according to program respectively and are completed, and have rubber seal rings for seal connection, form the oil circuit of independent completion sealing between its mutual direct-connected oil circuit aperture, the sealing of oil circuit comprises the sealing of the oil circuit hole collar extension of sealing between mutual direct-connected oil circuit aperture and port connection and housing, flashboard assembly and the variable bore ram slips of the reducing oil pipe clamping preventer equipment reducing surging,The flashboard assembly of reducing belongs to the one of half envelope flashboard assembly, and the flashboard assembly of reducing comprises gate panel body and the seal of half envelope, and seal comprises top glue core, reducing glue core, the gate panel body of half envelope of the flashboard assembly of reducing matches with top glue core, reducing glue core, and the gate panel body of half envelope of the flashboard assembly of its reducing is referred to as variable bore ram body, variable bore ram body complements one another with seal and is connected, top glue core also claims top sealing, and reducing glue core also claims front reducing sealing, reducing glue core is made up of agent structure and external ear, its agent structure is the structure of semi-toroidal shape, left and right two head part of its agent structure are protruded the external ear that forms symmetrical bulk shape not laterally, thus, head and the external ear of its agent structure are interconnected to form the head of reducing glue core, and reducing glue core has two heads, reducing glue core comprises reducing colloid, ironware, parallels, motion bar, connecting rod, reducing glue core comprises multiple ironwares, four parallels, two motion bars and two connecting rods, the head of reducing glue core has two glue planes that are parallel to each other, wherein, a glue plane is front glue plane before head, another glue plane back side after head is rear glue plane, the front glue plane of two heads of reducing glue core at grade, its place plane is vertical with the longitudinal middle tangent plane of reducing glue core, and the rear glue plane of two heads of reducing glue core at grade, the agent structure of reducing glue core comprises outer ring and the semicircular inner ring of arc, glue plane after two of connections are intersected in outer ring, inner ring intersects connection two front glue planes, the arc core line of the arc core line of outer ring and the arc core line of inner ring and assembly is same straight line, and its arc core line is in the affiliated plane of longitudinal middle tangent plane of reducing glue core, variable bore ram body complements one another with seal and is connected, variable bore ram body there is hatch frame, hatch frame is positioned at the front portion of variable bore ram body, hatch frame and reducing glue core adapt to, match, hatch frame comprises two opening sheets, the anteriomedial of opening sheet has the opening of arc, its opening both sides are respectively forward plane, two forward plane respectively with the crossing connection of inner circumferential wall of the opening of the arc of the anteriomedial of opening sheet, two forward plane at grade, the arc core line of the inner circumferential wall of opening and the middle tangent plane of variable bore ram body are at grade, forward plane is mutually vertical with the middle tangent plane of variable bore ram body, opening sheet has middle inner face and two side inner faces, two opening sheets are respectively top opening sheet and bottom opening sheet, the middle inner face of top opening sheet is relative with the middle inner face of bottom opening sheet and be parallel to each other, the side inner face of top opening sheet is relative with the side inner face of bottom opening sheet and be parallel to each other, the arc core line of the inner circumferential wall of the opening of two opening sheets on the same line, the inner circumferential wall connection of arc is had between the middle inner face of two opening sheets, the inner circumferential wall of its arc is referred to as center peripheral wall surfaces, the arc core line of the arc core line of its center peripheral wall surfaces and the inner circumferential wall of opening on the same line, the diameter of its center peripheral wall surfaces is greater than the diameter of the inner circumferential wall of opening, center peripheral wall surfaces respectively with the crossing connection of middle inner face of two opening sheets, there is respectively inner plane the both sides of center peripheral wall surfaces, two inner planes at grade, inner plane is parallel with forward plane, inner plane connection crossing with center peripheral wall surfacesBetween inner plane and side inner face, be connected by interior lead angle, arc seal groove is arranged at the top of variable bore ram body, arc seal groove comprises intermediate seal groove and side seal groove, two side seal grooves lay respectively at the both sides of intermediate seal groove, intermediate seal groove is connected with both sides sealing groove respectively, the degree of depth of intermediate seal groove is less than the degree of depth of side seal groove, the groove bottom of intermediate seal groove is parallel with the groove bottom of side seal groove, the groove bottom of intermediate seal groove is parallel with middle inner face, the groove bottom of side seal groove intersects vertically be connected with inner plane, the groove bottom of the side seal groove on earth vertical range of the side inner face of opening sheet is less than the side inner face vertical range of the side inner face of opening sheet on earth of top opening sheet, inner plane there is the blind hole of connection reducing glue core, its blind hole center line is vertical with inner plane, the groove bottom of side seal groove has the blind hole of connection top glue core, and its blind hole center line is vertical with the groove bottom of side seal groove, and two blind holes intersections communicate, the bottom opening sheet of variable bore ram body there are centering guiding oblique angle and centering gathering sill, bottom opening sheet has the water jacket at connection centering guiding oblique angle, centering guiding oblique angle is fixedly connected on water jacket, and the fixed connection structure of centering guiding oblique angle and water jacket adopts Welding Structure or adopts headless screw syndeton, when adopting headless screw syndeton, its bottom opening sheet there are two through holes, the center line of its through hole is vertical with the middle inner face on bottom opening sheet, two through hole communicates with water jacket respectively, its through hole is female thread structure, centering guiding has two internal thread holes that match corresponding with two through holes on bottom opening sheet on oblique angle, is fastenedly connected respectively bottom opening sheet and the centering oblique angle that leads by headless screw, and the centering oblique angle that leads is fixedly connected on water jacket, like this, reducing glue core cooperatively interacts be connected with variable bore ram body, its reducing glue core pressure is sandwiched between the top opening sheet and bottom opening sheet of hatch frame of variable bore ram body, and the main body bar of connecting rod that reducing colloid is stretched out in the outer end of the main body bar of the connecting rod of reducing glue core namely injects in the blind hole of connection reducing glue core of variable bore ram body completely, top glue core is pressed in the arc seal groove at the embedding top that is sandwiched in variable bore ram body, and the connecting rod of the top colloid that stretches out top glue core of its top glue core injects in the blind hole of connection top glue core of variable bore ram body completely, the connecting rod of its top glue core and the connecting rod of reducing glue core are cooperatively interacted be connected, namely the connecting rod of its top glue core injects in the through hole of outer end of main body bar of connecting rod of reducing glue core, like this, its top glue core and reducing glue core are attached to respectively on variable bore ram body, and Jiao Xin two, top cooperatively interacts link together with reducing glue core both ends respectively, and forms confined space, thus, form the flashboard assembly of reducing, the diameter of the inner circumferential wall of the arc of the opening sheet of variable bore ram body be greater than reducing glue core inner ring semicircular inwall side face diameter or be greater than the diameter of semi-ring body of reducing glue core, variable bore ram body there is box structure, box structure is positioned at the back part of variable bore ram body, box structure matches with the pin thread structure of the outer end of the piston rod of blowout prevention, it is protruding straight trough, and it is made up of inside groove and water jacket, and namely there is protruding straight trough in the outside of variable bore ram body, laterally break-through pedestal, its groove bottom is plane, and protruding straight trough comprises inside groove and water jacketThe width of its inside groove is greater than the width of water jacket, vertical range between two groove bottom of the vertical range between two groove sides of water jacket and two groove structures at the top of the pin thread structure of the outer end of the piston rod of blowout prevention is identical, the width of the groove structure groove bottom of the pin thread structure of the outer end of the piston rod of its blowout prevention is identical with the width of the groove side of the water jacket of the box structure of variable bore ram body, the pin thread structure top plane of the outer end of the piston rod of blowout prevention is identical to the degree of depth of the vertical range of groove side adjacent with top plane of groove structure and the inside groove of the box structure of variable bore ram body, vertical range between two groove sides of the vertical range between two side planes of the pin thread structure of the outer end of the piston rod of blowout prevention and the inside groove of the protruding straight trough of the box structure of variable bore ram body is equal, the flashboard assembly of reducing has two, and the flashboard assembly of two reducings complements one another into the flashboard assembly of a set of reducing, and like this, its corresponding top glue core has two, and two top glue cores complement one another into a set of top glue core, its corresponding reducing glue core also has two, and two reducing glue cores complement one another into a set of reducing glue core, and in its a set of reducing glue core, two reducing glue cored structures are identical, variable bore ram body also has two, two a set of variable bore ram bodies of the supporting one-tenth of variable bore ram body, variable bore ram slips is the shape and structure of block, the outerplanar being parallel to each other that variable bore ram slips outer surface has two relative arc outer wall faces relative with two, arc outer wall face respectively with two crossing connections of outerplanar, outerplanar is vertical with the middle tangent plane of variable bore ram slips, two outerplanar, one is upper plane, and another is baseplane, variable bore ram slips comprises hatch frame, box structure, and hatch frame, box structure lay respectively at the front and rear of variable bore ram slips, box structure is positioned at the rear portion of variable bore ram slips, and box structure is convex slot, and it is made up of inside groove and water jacket, laterally break-through variable bore ram slips, and its groove bottom is plane, and convex slot comprises inside groove and water jacket, and the width of its inside groove is greater than the width of water jacket, hatch frame is positioned at the front portion of variable bore ram slips, hatch frame refers to the opening of the anterior centre of variable bore ram slips, the top layer of the inwall of its hatch frame is slip insert structure, slip insert structure is to be arranged to form by several slip inserts, slip insert is the pincers tooth of arc, because there is hatch frame the front portion of variable bore ram slips, the front portion of variable bore ram slips comprises two fronts, two fronts lay respectively at symmetrically variable bore ram slips the both sides of middle tangent plane, the complete pairing of variable bore ram slips, a set of variable bore ram slips has two variable bore ram slips, and namely two variable bore ram slips complement one another into a set of variable bore ram slips, the reducing oil pipe clamping preventer surging is bilateral symmetry, the male variable bore ram slips of a set of variable bore ram slips and female variable bore ram slips are equipped on hydraulic flashboard slips binding clasp, male variable bore ram slips and female variable bore ram slips are installed respectively in the side through hole of two clampings of the side through hole of the i.e. a pair of clamping of the housing of hydraulic flashboard slips binding clasp, male flashboard slips in the side through hole of the same a pair of left and right clamping of housing complements one another with female variable bore ram slips, relative between two, and in the side through hole of same clampingThe box structure of the pin thread structure reeve variable bore ram slips of the piston rod of the clamping of its correspondence is interior and mutually identical, and the variable bore ram slips that two complements one another is a set of variable bore ram slips, and the flashboard assembly of reducing is installed respectively in the side through hole of two blowout preventions of the side through hole of a pair of blowout prevention of its hydraulic flashboard blowout preventer, the flashboard assembly of the reducing in the side through hole of the same a pair of left and right blowout prevention of housing complements one another, relative between two, and in the side through hole of same blowout prevention, box structure on the variable bore ram body of the flashboard assembly of the pin thread structure reeve reducing of the piston rod of the blowout prevention of its correspondence is interior and mutually identical, the flashboard assembly that the flashboard assembly of two reducing complementing one another is a set of reducing, the be tightly connected hydraulic oil pipeline of hydraulic system of port connection, it is characterized in that: reducing colloid is the carrier of ironware, parallels, motion bar, connecting rod, ironware, parallels, motion bar, connecting rod are incorporated into respectively among reducing colloid, reducing glue core is by the disposable sulfuration and become an entirety in mould of multiple ironwares, four parallels, two motion bars and two connecting rods and rubber, ironware is the structure of special-shaped cam, ironware is made up of two special-shaped cams and connector, the end of ironware is special-shaped cam, special-shaped cam comprises head, middle part and afterbody, special-shaped cam is the structure of narrow " V " shape leaf lobe shape of head, connector two connects respectively special-shaped cam, reducing glue core has multiple ironwares, multiple ironwares are incorporated into respectively among reducing colloid, thus the assembly of the frame structure of multiple ironwares formation semi-ring forms, assembly belongs to a part for reducing glue core agent structure, two special-shaped cams of same ironware lay respectively at the skin of the both sides of reducing glue core agent structure, its ironware is longitudinally erected in reducing colloid inside, the head of the special-shaped cam of ironware is positioned at inner side, the afterbody of the special-shaped cam of ironware is positioned at outside, parallels is rectangle structure, there is through hole the centre of parallels, motion bar is columniform bar, it comprises mobile jib and bar head, bar head has two, connecting rod is interconnected to constitute by main body bar and major part, there is through hole the outer end of the main body bar of its connecting rod, major part there are a medial plane and breach, its motion bar is longitudinally erected in the inside of the head of reducing glue core, and be erected in the outside of assembly, the bar head of motion bar one end puts in the through hole of a parallels, the bar head of the motion bar other end puts in the through hole of another parallels, between its motion bar and parallels, be connected, the outer end of the main body bar of connecting rod is stretched out reducing colloid backward, namely the rear glue plane of the head of reducing glue core is stretched out, thus, its motion bar and with direct-connected two parallels of its motion bar, connecting rod forms a grip assembly, one head of its reducing glue core comprises a grip assembly, and another head of its reducing glue core comprises another set of assembly, parallels protrudes the agent structure of reducing glue core, be positioned at the outside of the affiliated plane of the lateral surface of special-shaped cam, interlaced between the special-shaped cam of parallels and the ironware in the head of reducing glue core, partially overlap, its parallels is positioned at the skin of the head of reducing glue core, and the head of the agent structure of connection reducing glue core, parallels belongs to a part for external ear, the inwall of the hatch frame of its variable bore ram slips comprises the inwall of three circular arcs, i.e. intermediate inner wall and two side inwalls,Two side inwall connections crossing with intermediate inner wall respectively, two side inwalls lay respectively at intermediate inner wall both sides, namely between its intermediate inner wall between two side inwalls, the inwall of its hatch frame is the combining structure of two side inwalls and an intermediate inner wall, the slip insert structure of its variable bore ram slips comprises three groups of slip insert structures, namely the slip insert structure on the top layer of intermediate inner wall is positioned at, it is referred to as middle slips dental structure, be positioned at the slip insert structure on the top layer of side inwall, it is referred to as side slip insert structure, side slip insert structure has two, slips dental structure both sides in the middle of two side slip insert structures lay respectively at, namely in the middle of it between slip insert structure between two side slip insert structures, Corresponding matching is thick respectively for its side inwall and intermediate inner wall, the columniform oil pipe of thin two kinds of specifications, namely the columniform oil pipe that side inwall is corresponding thick, the columniform oil pipe that intermediate inner wall is corresponding thin, thick columniform oil pipe is large diameter columniform oil pipe, the columniform oil pipe of thin columniform oil pipe minor diameter, in two variable bore ram slips of same set of variable bore ram slips, the fluted structure in front of an one variable bore ram slips, there is male head structure the front of another variable bore ram slips, the variable bore ram slips of its fluted structure is referred to as female variable bore ram slips, and it has the variable bore ram slips of male head structure to be referred to as public variable bore ram slips, the fluted structure in front of female variable bore ram slips, there is male head structure the front of public variable bore ram slips.

2. the reducing oil pipe clamping preventer surged according to claim 1, it is characterized in that: special-shaped cam has lateral surface and medial surface, lateral surface and the medial surface of special-shaped cam are parallel to each other, the outer wall of the head of special-shaped cam is arc-shaped surface, the outer wall of the head of its special-shaped cam is respectively with the lateral surface of special-shaped cam with medial surface is crossing connects, there are two wall planes be connected that intersect vertically with lateral surface and medial surface respectively at the middle part of special-shaped cam, two wall plane apportion both sides, two wall planes are crossing with the two ends of the outer wall of head respectively to be connected, in two wall planes, the short wall plane of its length is referred to as shortwall plane, the wall plane that its length is long is referred to as longwell plane, the afterbody of special-shaped cam is convex-concave curved configuration, the afterbody of special-shaped cam comprises the outside wall surface of " s " shape, the outside wall surface of arc curve and tail wall plane, the outside wall surface of " s " shape, the outside wall surface of arc curve and tail wall plane are respectively with the lateral surface of special-shaped cam with medial surface is crossing is connected, one end of the outside wall surface of " s " shape connects longwell plane, the other end of the outside wall surface of " s " shape connects tail wall plane, one end of the outside wall surface of arc connects shortwall plane, the other end of the outside wall surface of arc connects tail wall plane, like this, tail wall interplanar is in the outside wall surface of " s " shape, between the outside wall surface of arc, and respectively with the outside wall surface of " s " shape, the outside wall surface of arc curve intersects and connects, the inner side being positioned at the affiliated plane of longwell plane of the outside wall surface of " s " shape, the protrusion of the outside wall surface of arc curve and be positioned at the outside of the affiliated plane of shortwall plane, like this, the interior angle of the affiliated plane of tail wall plane and the affiliated Plane intersects of shortwall plane is obtuse angle, and the interior angle of the affiliated plane of tail wall plane and the affiliated Plane intersects of longwell plane is acute angle, connector is flat bar structure, and connector has two lateral surfaces and two arc surfaces, and two lateral surfaces of connector are parallel to each other, and lateral surface is between two arc surfaces, and arc surface is crossing with two lateral surfaces respectively to be connected, the medial surface of special-shaped cam intersects with connector and is vertically connected, two lateral surfaces of the center line difference connector of its connector are parallel and vertical with medial surface with the lateral surface of special-shaped cam, and two special-shaped cams be positioned at respectively symmetrically connector two outside, an arc surface of connector and the head of special-shaped cam are in the same side, and another arc surface of connector and the afterbody of special-shaped cam are in the same side, multiple ironware is spaced, evenly forward, ordered arrangement, the center line of the connector of its each ironware is parallel to each other and respectively on same circular arc, spacing distance between the center line of the connector of each ironware is identical, the lateral surface being positioned at the special-shaped cam of the same side of its each ironware at grade, the medial surface being positioned at the special-shaped cam of the same side of each ironware at grade, the head of ironware does not point to the arc core line of the circular arc at the center line place of the connector of each ironware, arc core line refer to the circular arc at the center line place of the connector through its each ironware arc core and respectively with the center line of the centerline parallel of the connector of each ironware, ironware is tiltedly to its arc core line, the head of the special-shaped cam of ironware refers to the side of arc core line partially, interval between the head of the special-shaped cam of its multiple ironware is identical, and equally, the interval between the afterbody of the special-shaped cam of its multiple ironware is identical.

3. the reducing oil pipe clamping preventer surged according to claim 1, it is characterized in that: the through hole of parallels has two relative inwall side planes be parallel to each other and two relative arc inner wall faces, relative with two the respectively inwall side plane be parallel to each other in arc inner wall face is crossing to be connected; The mobile jib two ends connecting-rod cap respectively of motion bar, mobile jib and bar head are respectively cylindrical shape, and the diameter of mobile jib is greater than the diameter of bar head, and the center line of mobile jib and bar head and motion bar is on the same line; Main body bar is cylindrical shape, and the through hole of the outer end of the main body bar of its connecting rod has two relative inwall side planes be parallel to each other and two relative arc inner wall faces, and relative with two the respectively inwall side plane be parallel to each other in arc inner wall face is crossing to be connected; The medial plane of its connecting rod is parallel with the inwall side plane of the through hole of main body bar, and the breach of its connecting rod is the opening of the shape of arc side face, and the arc core line of the arc side face of its breach is parallel with medial plane, its arc core line and main body bar central axis.

4. the reducing oil pipe clamping preventer surged according to claim 1, it is characterized in that: the center line of the center line of motion bar and the connector of ironware is parallel to each other, the center line of motion bar is vertical with the lateral surface of two parallels respectively, motion bar and connecting rod are interconnected, connecting rod links the mobile jib of motion bar by the breach on its major part, make the center line of main body bar and the central axis of motion bar of connecting rod, and the center line of the main body bar of connecting rod divides the vertical distance of the lateral surface being clipped to two parallels equal, it is positioned at the lateral surface of two parallels of the same side of reducing glue core at grade, the center line of the main body bar of two connecting rod is parallel to each other, and the center line of the main body bar of two connecting rods divides the vertical distance of the longitudinally middle tangent plane being clipped to reducing glue core equal, its inner ring is sandwiched between the affiliated plane of the medial surface of two special-shaped cams of same ironware, and in the middle of inner ring is longitudinal, the longitudinally middle tangent plane of tangent plane and reducing glue core is same plane, the inner ring of the agent structure of reducing glue core adopts the structure of semicircular inwall side face or adopts the structure of semi-ring body, two heads of reducing glue core, one for there being the head of two interfaces, one for there being the head of two guide grooves, at the head having two interfaces of reducing glue core, two special-shaped cams of the ironware of one end of its assembly stretch out corresponding front glue plane respectively, the part at middle part that the part of stretching out front glue plane of its special-shaped cam is the whole of a part for the head of its special-shaped cam or the head of the head of special-shaped cam and the part at middle part or special-shaped cam and is inconjunction with, the part of stretching out front glue plane of its special-shaped cam is referred to as stretched head, stretched head is two, and the interface of the head of its reducing glue core is in front glue plane, at the head having two guide grooves of reducing glue core, two special-shaped cams of the ironware of the other end of its assembly stretch out its front glue plane corresponding respectively, the part of stretching out front glue plane of its special-shaped cam is the part of the afterbody of its special-shaped cam or the afterbody of special-shaped cam and the part at middle part, two special-shaped cams of the ironware of this end of its assembly respectively and produce the breach of two dihedrals between inner ring and front glue plane, its breach is guide groove, the part of stretching out front glue plane of the special-shaped cam of this end of its assembly is referred to as to stretch out tail, and stretching out tail is two, when the inner ring of the agent structure of reducing glue core adopts the structure of semicircular inwall side face, each special-shaped cam of the inside outstanding assembly of its inner ring, when the structure of the inner ring employing semi-ring body of the agent structure of reducing glue core, the structure of semi-ring body comprises semicircular inwall side face and semi-ring body, semi-ring body connects and is positioned at the middle part of semicircular inwall side face, the semicircular inwall side face that semi-ring body is inwardly outstanding, and each special-shaped cam inwardly giving prominence to assembly, its semi-ring body is sandwiched between the affiliated plane of the medial surface of two special-shaped cams of same ironware, semi-ring body longitudinally in the middle of tangent plane and reducing glue core longitudinally in the middle of tangent plane be same plane, a part for the head of two special-shaped cams of each ironware of assembly or the head of the head of two special-shaped cams and the part at middle part or two special-shaped cams whole and the part at middle part that is inconjunction with thereof are respectively to the interior inwall side face tiltedly stretching out inner ring.

5. the reducing oil pipe clamping preventer surged according to claim 1, it is characterized in that: two side inner faces of the opening sheet of variable bore ram body lay respectively at the both sides of middle inner face, two side inner faces at grade, middle inner face is parallel with side inner face, middle inner face is mutually vertical with the arc core line of the inner circumferential wall of opening, middle inner face protrudes from side inner face, thus is connected by side between its middle inner face and side inner face, and its side is vertical with side inner face with middle inner face to be respectively connected; Make to form a breach between the side inner face of the groove bottom of side seal groove, inner plane and top opening sheet.

6. the reducing oil pipe clamping preventer surged according to claim 1, it is characterized in that: when the flashboard assembly of two reducings docks mutually, the flashboard assembly of two reducings of the flashboard assembly of a set of reducing complements each other to form a unified overall structure, namely in two variable bore ram bodies of a set of variable bore ram body, centering guiding oblique angle on two variable bore ram bodies and centering gathering sill cooperatively interact, its centering guiding oblique angle is made to inject mutually corresponding centering gathering sill, in two reducing glue cores of a set of reducing glue core, having the head of two interfaces and having the head of two guide grooves to cooperatively interact to dock respectively on two reducing glue cores, its stretched head respectively on two reducing glue cores and guide groove, stretch out tail and interface cooperatively interacts, stretched head is made to inject mutually corresponding guide groove, stretch out tail and inject mutually corresponding interface, and in its a set of reducing glue core, the lateral surface being positioned at the special-shaped cam of the same side of each ironware of two reducing glue cores at grade.

7. the reducing oil pipe clamping preventer surged according to claim 1, it is characterized in that: the inner circumferential of each slip insert of the middle slips dental structure of variable bore ram slips is on same affiliated circular arc side face, the inner circumferential of each slip insert of side slip insert structure is on same affiliated circular arc side face, the internal diameter of the inner circumferential of the slip insert of side slip insert structure is greater than the internal diameter of the inner circumferential of the slip insert of middle slips dental structure, namely the internal diameter of the affiliated circular arc side face of the inner circumferential of the slip insert of side slip insert structure is greater than the internal diameter of the affiliated circular arc side face of the inner circumferential of the slip insert of middle slips dental structure, the affiliated circular arc side face of the inner circumferential of the slip insert of two side slip insert structures and the arc core line of two side inwalls are same straight line, the arc core line of the affiliated circular arc side face of the inner circumferential of the slip insert of intermediate inner wall and middle slips dental structure is same straight line, two arc core lines are parallel to each other, and respectively with the middle tangent plane of variable bore ram slips at grade, two arc core line is vertical with the outerplanar of variable bore ram slips respectively, the arc core line of side inwall is positioned at the front of the arc core line of intermediate inner wall.

8. the reducing oil pipe clamping preventer surged according to claim 1, it is characterized in that: the groove structure of variable bore ram slips comprises two grooves, three opening sheets, the top of i.e. front there is the groove of the opening of two transverse directions, its groove comprises groove bottom and groove side, two groove sides are parallel to each other and intersect vertically with groove bottom respectively and are connected, groove bottom is vertical with the outerplanar of female variable bore ram slips, groove bottom is vertical with the middle tangent plane of female variable bore ram slips with groove side, like this, the top of its front is just formed three apart from one another by the structure of opening sheet, its opening sheet of three is respectively upper shed sheet, split shed sheet, bottom opening sheet, the inwall of the opening sheet of three is all a part for side inwall, the male head structure of variable bore ram slips comprises two males, groove, two unfilled corners, the top of its front has two transverse directions apart from one another by outstanding male, groove is formed between two male and end face, its groove comprises groove bottom and groove side, the side that two of two males are relative is groove side, groove bottom is the part being sandwiched in the end face between two groove sides of connection two groove sides, two groove sides are parallel to each other and intersect vertically with groove bottom respectively and are connected, groove bottom is vertical with the outerplanar of public variable bore ram slips, groove bottom is vertical with the middle tangent plane of public variable bore ram slips with groove side, mutually intersect vertically between the lateral surface of male and end face and form the unfilled corner in outside, lateral surface and groove side are parallel to each other, the male of two is respectively male, lower male, the inwall of two males is all a part for side inwall, thus, the top of its front is just formed two apart from one another by the structure of male, two unfilled corner is respectively unfilled corner and end unfilled corner, when the variable bore ram slips of mother docks mutually with male variable bore ram slips, female variable bore ram slips and male variable bore ram slips complement each other to form a unified overall structure, namely in two variable bore ram slips of a set of variable bore ram slips, the male head structure of the front of male variable bore ram slips cooperatively interacts with the groove structure of the front of female variable bore ram slips and is connected, mutually coincide in two grooves making two males of the male head structure of male variable bore ram slips inject the groove structure of the variable bore ram slips of mutually corresponding mother respectively, simultaneously, the upper shed sheet of the groove structure of female variable bore ram slips, split shed sheet, bottom opening sheet injects the upper unfilled corner of the variable bore ram slips of mutually corresponding public affairs respectively, groove, mutually coincide in end unfilled corner.