CN210164454U - Wellhead device of low-pressure operation overflow well - Google Patents

Abstract

The utility model relates to a well head device of low pressure operation overflow well, the back wall bottom of box is equipped with out the liquid interface, the degree of depth in box back zone is greater than the degree of depth of box prozone, the center of box prozone is equipped with the drum that links to each other and runs through box prozone diapire with box prozone diapire, the welding has horizontal gland in the drum, the outer circumference evenly distributed of horizontal gland has the gland bolt hole, the bolt passes each gland bolt hole with the last flange fixed connection of horizontal gland and preventer, the center of horizontal gland is equipped with the gland centre bore that supplies the oil pipe to pass through. The diameter of the box body in the left and right directions of the horizontal gland is divided into a front box and a rear box, the horizontal gland is divided into a front semicircular gland and a rear semicircular gland which are symmetrical, the rear wall of the front box is connected to the left and right sides of the front semicircular cylinder, and the front wall of the rear box is connected to the left and right sides of the rear semicircular cylinder. The device has the overflow and collects the function, alleviates environmental pollution, improves construction well head environment.

Description

Wellhead device of low-pressure operation overflow well

Technical Field

The utility model relates to an oil field operation instrument, in particular to well head device of low pressure operation overflow well belongs to oil field appurtenance technical field.

Background

The wellhead device of the oil-water well comprises a cross joint and a blowout preventer arranged above the cross joint, wherein an oil pipe extends along the center of the blowout preventer. In the conventional operation process of the small overflow well of the oil-water well, the overflow caused by the leakage between the periphery of the oil pipe and the blowout preventer and the overflow caused by the outflow of liquid in the oil pipe often bring serious pollution to a well site. In the process of lifting the oil pipe, when the oil pipe is not communicated or the lower part of the oil pipe is not provided with an oil drainage device, when a connecting screw thread of the oil pipe is disassembled, liquid in the oil pipe can rapidly flow downwards, dirty oil and water fall and splash to the upper plane of a flange of a blowout preventer, the environment pollution of a well mouth is caused, the construction environment is worsened, and the physical and mental health of operating personnel is influenced.

The wellhead device of a plurality of low-pressure operation overflow wells in the prior art is of an integral structure generally, is large in size, can reach hundreds of kilograms as a whole, needs several persons for one time for dismounting, can be completed by means of a crane, and is poor in collecting effect due to poor sealing performance of the wellhead when in use. Although the U-shaped overflow launder of non-overall structure is single weight ratio is lighter, has increased work load and the degree of difficulty of assembling at the well head, in the use, the yielding is easily corroded, warp the back and seal not tight, leads to sealed effect not good, causes dirty oil water to fall to the ground. Under the condition of higher and higher environmental protection requirements, the problem that the oil field construction is troubled always is how to realize the effect of avoiding the overflow pollution of a well field without influencing the operation speed.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the problem that exists among the prior art, provide a well head device of low pressure operation overflow well, have the overflow and collect the function, and when oil pipe unloads and detains, can buffer the formula and collect single intraductal liquid of oil, alleviate environmental pollution, improve construction well head environment, satisfy safety ring and protect the needs.

In order to solve the technical problem, the utility model discloses a well head device of low pressure operation overflow well, including the upper end open-ended box, the back wall bottom of box is equipped with liquid outlet, and the degree of depth in box back zone is greater than the degree of depth of box prozone, and the prozone diapire passes through the swash plate and links to each other with the back zone diapire, and the center of box prozone is equipped with the drum that links to each other and run through box prozone diapire with box prozone diapire, the welding has horizontal gland in the drum, the outer circumference evenly distributed of horizontal gland has the gland bolt hole, and the bolt passes each gland bolt hole and with the flange fixed connection of horizontal gland and preventer, the center of horizontal gland is equipped with the; the vertical plane at the diameter place of horizontal gland left and right sides is cut apart into front cabinet and back box to the box, horizontal gland is cut apart into preceding semicircle gland and the latter half circle gland of symmetry, preceding semicircle barrel and the latter half drum of symmetry are cut apart into to the drum, the left and right sides of semicircle barrel in the front is connected to the back wall of front cabinet, the left and right sides at latter half drum is connected to the preceding wall of back box.

Compared with the prior art, the utility model discloses following beneficial effect has been obtained: the cylinder forms a cofferdam to separate the collected dirty oil from water, the inner cavity of the cylinder is used as a connecting space between the horizontal gland and the flange of the blowout preventer, and the box body is small and exquisite and has light weight; the front area of the box body faces to operators, the depth is shallow, the weight is further reduced, the whole body can be moved by one person, the weight of the box body is supported on the cylinder, and the weight of the cylinder is directly supported on the flange of the blowout preventer through the horizontal gland. The inclined plate not only plays a role in guiding flow, but also provides space for the installation of the gland bolt. The box back zone is close to derrick one side, has certain degree of depth, and the liquid storage capacity is slightly bigger, goes out the liquid interface and passes through the hose and link to each other with connecing the liquid bucket, or leads to special collecting pit, jar with liquid in, can not the sinuous flow cause well head equipment, ground, instrument to pollute, improves construction well head operation environment, plays safety, environmental protection. When the oil pipe is pulled out, the oil pipe is pulled out upwards or inserted downwards along the axis of the blowout preventer, and at the moment, the integral box body cannot be installed at a wellhead due to the blocking of the oil pipe. The utility model discloses a front box and back box concatenation, preceding semicircle gland and latter half circle gland surround from oil pipe around both sides and splice into complete horizontal gland, and preceding semicircle barrel surrounds with latter half drum simultaneously and splices into complete drum, for horizontal gland and the connection of preventer flange provide the space, the mode that adopts two halves concatenation can be installed at the well head very conveniently. And the front box and the rear box are respectively complete box bodies, and liquid leakage cannot be caused even if the front box and the rear box deform after long-term use.

As an improvement of the present invention, a rubber core is inserted into an upper port of the blowout preventer, a lower end of the rubber core is inserted into an inner cavity of the blowout preventer, an outward-turned rubber core T-shaped head is arranged at an upper end of the rubber core, the rubber core T-shaped head is seated on a flange of the blowout preventer, concave gland caulking grooves are arranged on lower end surfaces of the front semicircular gland and the rear semicircular gland, an upper end surface of the rubber core T-shaped head is embedded into the gland caulking groove, a downward-convex rubber core convex ring is arranged on a lower end surface of the rubber core T-shaped head, and the rubber core convex ring is embedded into a sealing groove of the flange of the blowout preventer; the center hole of the rubber core and the center hole of the gland are coaxial, the lower part of the center hole of the rubber core is in interference fit with the periphery of the oil pipe, and the upper end of the center hole of the rubber core is provided with a horn mouth. The bell mouth of rubber core upper end is convenient for oil pipe and is inserted from rubber core centre bore, and the lower part of rubber core centre bore has realized the sealed of oil pipe periphery with oil pipe periphery interference fit, and the lower extreme of rubber core inserts the inner chamber of preventer, stops that the liquid stream in the pit from the annular space blowout between oil pipe and the preventer, seals the overflow in the pit in the well head below, greatly reduced the overflow volume of well head. The rubber core T-shaped head is seated on the blowout preventer flange and is compressed by the gland, so that the sealing between the rubber core T-shaped head and the gland as well as between the rubber core T-shaped head and the blowout preventer flange is realized; the lower terminal surface of the T-shaped head of the rubber core is provided with the rubber core convex ring and is embedded in the sealing groove of the flange of the blowout preventer, so that the sealing effect is further improved, the rubber core is accurately positioned together with the gland caulking groove, and the coaxial line of the rubber core and the blowout preventer is ensured.

As a further improvement of the utility model, the lower terminal surface of preventer flange is equipped with the go-between that forms by two connection semi-rings concatenation in opposite directions, evenly distributed has the go-between boss of a plurality of thickenings on the go-between, and the center of each go-between boss is equipped with the go-between screw respectively, and the upper end of each go-between screw is equipped with the horn mouth respectively, and each bolt top-down passes corresponding gland bolt hole and preventer flange bolt hole in proper order and connects soon in corresponding go-between screw. The two connecting semi-rings are conveniently clamped at the neck part below the flange of the blowout preventer in opposite directions, and the connecting ring screw holes in the centers of the bosses of the connecting rings respectively play a role of nuts; when the rubber core is installed, the rubber core convex ring is inserted into the inner cavity of the blowout preventer, the rear connecting semi-ring is placed below the flange of the blowout preventer, the rear box is placed on the rubber core, the rear half part of the gland caulking groove is aligned with the T-shaped head of the rubber core and pressed down, and each bolt penetrates through the bolt hole of the rear half circular gland and the bolt hole of the flange of the blowout preventer from top to bottom and is screwed in the connecting ring screw hole of the rear connecting semi-ring; after the rear box is installed, the front box is placed on the rubber core, the front half part of the gland caulking groove is aligned to the T-shaped head of the rubber core and pressed down, and each bolt penetrates through a bolt hole of the front semicircular gland and a bolt hole of a flange of the blowout preventer from top to bottom and is screwed in a connecting ring screw hole of the front connecting semi-ring; thus, the whole box body is fixed on the flange of the blowout preventer. The whole installation process can be completed only by matching two persons without large-scale machines such as cranes and the like, so that the operation cost is greatly reduced.

As a further improvement, the horizontal gland is the ladder cross-section that the high periphery in center is low, the gland bolt hole distributes on the thin circumference in horizontal gland periphery, and the top of bolt covers has the semi-ring closing cap of two symmetries, and two halves ring closing cap amalgamation becomes a complete ring closing cap, the top of ring closing cap and the central point parallel and level of horizontal gland. The central area of the horizontal gland provided with the gland caulking groove is thicker in thickness and thinner in periphery, and after the bolt is installed, the bolt is covered by the semi-ring sealing cover, so that the bolt is arranged in the horizontal gland, the top of the device is kept flat, and the possibility of collision is reduced.

As a further improvement of the utility model, the upper portion welding of wall has the U-shaped overflow launder that extends backward behind the front box, the inner chamber of back box is stretched into to the breach that the wall passed the back box before the rear end of U-shaped overflow launder. The front box is shallow and mainly plays a role in collection, the liquid storage amount is very small, and when the liquid level in the front box is higher than the bottom of the U-shaped overflow groove, liquid flow flows into the rear box through the U-shaped overflow groove and flows out of a liquid outlet interface of the rear box. Because the rear end of the U-shaped overflow groove crosses the splicing seam of the front box and the rear box and directly extends into the inner cavity of the rear box, even if the U-shaped overflow groove is deformed after being used for a long time, the liquid flow of the front box can not leak from the splicing seam of the front box and the rear box, and the environment of a wellhead is further ensured.

As a further improvement, the top of wall is equipped with the board of bending of buckling downwards backward behind the front box, the board of bending hooks and hangs the upper end of wall before the back box, the left side of the board of bending is along supporting the left wall inboard at the back box, and the right edge of the board of bending is supported the right wall inboard at the back box. The bending plate has a function similar to that of a hook, and after the rear box is installed, the front box can be directly hung on the rear box through the bending plate, so that the load of an installer for lifting the front box is reduced; the left edge and the right edge of the bending plate are abutted against the left wall and the right wall of the rear box, so that the front box is directly positioned in the left-right direction, namely, the front box is automatically aligned with the rear box, and the installation is more rapid and convenient.

As a further improvement, the upper periphery of the front semi-cylinder is provided with a net grid, and the front end of the net grid is welded on the front wall of the front box. The net grid can be used as a laying platform for wellhead operation, and liquid can directly fall into the front box from the net grid.

As a further improvement of the utility model, a splash-proof box is placed in the middle of the deep area of the rear box, the upper end and the bottom of the splash-proof box are both open, and the lower part of the wallboard of the splash-proof box is provided with a drainage port convenient for liquid to flow out; the last port of splashproof case is higher than the last port of back box, the splashproof case is narrow structure and upper portion to the front and lean out under the front and back direction is wide, be equipped with the splashproof piece that the multichannel is inclined to vertical plane and is parallel to each other on the inner chamber cross section of splashproof case. At the oil pipe in-process of playing, if there is more dirty profit water in the oil pipe, when the connection screw thread of oil pipe is being pulled off, have more liquid stream and flow downwards rapidly, directly fall into the box, cause easily and splash. The utility model discloses set up the splashproof case directly after oil pipe, in the moment of breaking off the connection screw thread, operating personnel pushes oil pipe backward to the top of splashproof case, and dirty profit falls into the splashproof case after the direction of each splashproof piece, can avoid the splash, and the dirty profit that falls into the splashproof case flows out from the earning outlet of splashproof bottom of the case portion, gets into the back box, and the splashproof case is higher than the back box, is enough to hold the instantaneous great liquid stream, ensures that can not spill over from the upper end of splashproof case; can greatly reduce environmental pollution, improve the environment of a construction wellhead and have higher environmental benefit.

As the utility model discloses a further improvement, the back wall of splashproof case is laminated with the back wall of back box mutually, the splash-proof case about the wall by the centre gripping between the back box bead board, the back box bead board welds the last edge of wall and extends forward behind the back box. The area of the rear box is relatively large, the depth of the rear area of the rear box is relatively deep, the rear box edge plate is arranged, on one hand, the strength of the rear box can be improved, on the other hand, the splash-proof box can be positioned in the left and right directions, the splash-proof box is ensured to be positioned right behind the central hole of the gland, and the offset of the splash-proof box relative to the oil pipe is avoided.

Drawings

The invention will be described in further detail with reference to the drawings and the detailed description, which are provided for reference and illustration purposes only and are not intended to limit the invention.

Fig. 1 is a front view of a first embodiment of a wellhead device of a low-pressure operation overflow well.

Fig. 2 is a top view of fig. 1.

Fig. 3 is a perspective view of fig. 1.

Fig. 4 is a front view of the front box of fig. 1.

Fig. 5 is a left side view of fig. 4.

Fig. 6 is a top view of fig. 4.

Fig. 7 is a perspective view of fig. 4.

Fig. 8 is a front view of the rear box of fig. 1.

Fig. 9 is a top view of fig. 8.

Fig. 10 is a right side view of fig. 8.

Fig. 11 is a front view of the connector halves.

Fig. 12 is a bottom view of the connector halves.

Fig. 13 is a perspective view of the splash box.

Fig. 14 is a front view of the splash box.

Fig. 15 is a front view of a second embodiment of a wellhead assembly for a low pressure overflow well.

Fig. 16 is a top view of fig. 15.

Fig. 17 is a perspective view of fig. 15.

Fig. 18 is an exploded view of fig. 17.

In the figure: 1. a front box; a 1 a.U-shaped isopipe; 1b, bending a plate; 1c, a mesh grid; 2. a rear box; 2a, an inclined plate; 2b, a liquid outlet; 2c, a rear box edge plate; 2d, notching; 3. a cylinder; 3a, a front half cylinder; 3b, a rear half cylinder; 4. a horizontal gland; 4a, a front semicircular gland; 4b, a rear semicircular gland; 4c, pressing the central hole of the cover; 4d, pressing a cover bolt hole; 4e, embedding a gland into a groove; 5. a rubber core; 5a, a rubber core T-shaped head; 5b, a rubber core convex ring; 5c, a center hole of the rubber core; 6. a blowout preventer; a blowout preventer flange; 7. connecting the half rings; 7a, connecting ring bosses; 7b, connecting ring screw holes; 8. a splash box; 8a, a splash guard; 8b, a drainage port; 9. and (5) semi-ring sealing cover.

Detailed Description

As shown in fig. 1 to 3, the utility model discloses a well head device of low pressure operation overflow well includes upper end open-ended box, the back wall bottom of box is equipped with liquid outlet 2b, the degree of depth in box back zone is greater than the degree of depth of box prozone, the prozone diapire passes through swash plate 2a and links to each other with the back zone diapire, the center of box prozone is equipped with the drum 3 that links to each other and run through box prozone diapire with box prozone diapire, welding has horizontal gland 4 in the drum 3, the outer circumference evenly distributed of horizontal gland 4 has gland bolt hole 4d, the bolt passes each gland bolt hole 4d and with the flange fixed connection of horizontal gland 4 with preventer 6, the center of horizontal gland 4 is equipped with the gland centre bore 4c that.

The cylinder 3 forms a cofferdam to separate the collected dirty oil from water, the inner cavity of the cylinder 3 is used as a connecting space between the horizontal gland 4 and the blowout preventer flange 6a, and the box body is small and exquisite and has light weight; the front area of the box faces the operator, the depth is shallow, the weight is further reduced, the whole body can be moved by one person, the weight of the box is supported on the cylinder 3, and the weight of the cylinder 3 is directly supported on the blowout preventer flange 6a through the horizontal gland 4. The sloping plate 2a not only plays a role in guiding flow, but also provides space for installing the gland bolt. The box back zone is close to derrick one side, has certain degree of depth, and the liquid storage capacity is slightly bigger, goes out liquid connector 2b and links to each other with connecing the liquid bucket through the hose, or leads to special collecting pit, jar with liquid in, can not the sinuous flow cause well head equipment, ground, instrument to pollute, improves construction well head operation environment, plays safety, environmental protection.

As shown in fig. 4 to 10, a vertical plane in which a diameter of the case in a left-right direction of the horizontal pressing cover 4 is located is divided into a front case 1 and a rear case 2, the horizontal pressing cover 4 is divided into a front semicircular pressing cover 4a and a rear semicircular pressing cover 4b which are symmetrical, the cylinder 3 is divided into a front semicircular cylinder 3a and a rear semicircular cylinder 3b which are symmetrical, a rear wall of the front case 1 is connected to left and right sides of the front semicircular cylinder 3a, and a front wall of the rear case 2 is connected to left and right sides of the rear semicircular cylinder 3b.

When the oil pipe is pulled out, the oil pipe is pulled out upwards or inserted downwards along the axis of the blowout preventer 6, and at the moment, the integral box body cannot be installed at a wellhead due to the blockage of the oil pipe. The utility model discloses a front box 1 splices with 2 concatenations of back boxes, and preceding semicircle gland 4a and latter half circle gland 4b surround from oil pipe around both sides and splice into complete horizontal gland 4, and preceding semicircle barrel 3a surrounds with latter half drum 3b simultaneously and splices into complete drum, provides the space for horizontal gland 4 and preventer flange 6 a's being connected, and the mode that adopts two halves concatenation can be installed at the well head very conveniently. And the front box 1 and the rear box 2 are respectively complete box bodies, and even if the box bodies deform after long-term use, liquid leakage cannot be caused.

As shown in fig. 15, a rubber core 5 is inserted into an upper port of a blowout preventer 6, a lower end of the rubber core 5 is inserted into an inner cavity of the blowout preventer 6, an outward-turned rubber core T-shaped head 5a is arranged at the upper end of the rubber core 5, the rubber core T-shaped head 5a is seated on a blowout preventer flange 6a, concave gland caulking grooves 4e are arranged on the lower end surfaces of a front semicircular gland 4a and a rear semicircular gland 4b, the upper end surface of the rubber core T-shaped head 5a is embedded in the gland caulking groove 4e, a rubber core convex ring 5b which protrudes downwards is arranged on the lower end surface of the rubber core T-shaped head 5a, and the rubber core convex ring 5b is embedded in a sealing groove of the blowout preventer flange 6 a; the center hole of the rubber core 5 and the center hole 4c of the gland are coaxial, the lower part of the center hole 5c of the rubber core is in interference fit with the periphery of the oil pipe, and the upper end of the center hole 5c of the rubber core is provided with a horn mouth.

The bell mouth of the upper end of the rubber core 5 is convenient for inserting the oil pipe from the rubber core center hole 5c, the lower part of the rubber core center hole 5c is in interference fit with the periphery of the oil pipe to realize sealing of the periphery of the oil pipe, the lower end of the rubber core 5 is inserted into the inner cavity of the blowout preventer 6, downhole liquid flow is stopped from being ejected out from the annular space between the oil pipe and the blowout preventer 6, downhole overflow is sealed below a well head, and the overflow amount of the well head is greatly reduced. The rubber core T-shaped head 5a is seated on the blowout preventer flange 6a and is pressed by the gland, so that the sealing between the rubber core T-shaped head 5a and the gland and between the rubber core T-shaped head and the blowout preventer flange 6a is realized; the lower terminal surface of rubber core T shape head 5a sets up rubber core bulge loop 5b and inlays in the seal groove of preventer flange 6a, has further improved sealed effect, fixes a position rubber core 5 with gland caulking groove 4e jointly to the accuracy, ensures rubber core 5 and 6 coaxial lines of preventer.

The lower end surface of the blowout preventer flange 6a is provided with a connecting ring formed by splicing two connecting semi-rings 7 in opposite directions. As shown in fig. 11 and 12, a plurality of thickened connecting ring bosses 7a are uniformly distributed on the connecting ring, connecting ring screw holes 7b are respectively formed in the center of each connecting ring boss 7a, a bell mouth is respectively formed at the upper end of each connecting ring screw, and each bolt sequentially penetrates through a corresponding gland bolt hole 4d and a corresponding blowout preventer flange bolt hole from top to bottom and is screwed in the corresponding connecting ring screw hole 7b.

Two connecting half rings 7 are adopted to be conveniently clamped at the neck part below the blowout preventer flange 6a in opposite directions, and the connecting ring screw holes 7b in the centers of the connecting ring bosses 7a respectively play a role of nuts; when the device is installed, the rubber core 5 is inserted into the inner cavity of the blowout preventer 6, the rubber core convex ring 5b is embedded into the sealing groove of the blowout preventer flange 6a, the rear connecting semi-ring 7 is placed below the blowout preventer flange 6a, the rear box 2 is placed on the rubber core 5, the rear half part of the gland embedding groove 4e is aligned with the T-shaped head 5a of the rubber core and pressed down, and all bolts penetrate through the bolt holes of the rear half circular gland 4b and the bolt holes of the blowout preventer flange from top to bottom and are screwed into the connecting ring screw hole 7b of the rear connecting semi-ring 7; after the rear box 2 is installed, the front box 1 is placed on the rubber core 5, the front half part of the gland caulking groove 4e is aligned with the T-shaped head 5a of the rubber core and pressed down, and all bolts penetrate through bolt holes of the front semicircular gland 4a and bolt holes of a flange of a blowout preventer from top to bottom and are screwed in a connecting ring screw hole 7b of the front connecting semi-ring 7; this achieves that the entire housing is fixed to the blowout preventer flange 6a. The whole installation process can be completed only by matching two persons without large-scale machines such as cranes and the like, so that the operation cost is greatly reduced.

The upper part of the rear wall of the front box is welded with a U-shaped overflow groove 1a extending backwards, and the rear end of the U-shaped overflow groove 1a penetrates through a notch 2d of the front wall of the rear box and extends into the inner cavity of the rear box 2. The front box 1 is shallow and mainly plays a role in collection, the liquid storage amount is very small, and when the liquid level in the front box 1 is higher than the bottom of the U-shaped overflow groove 1a, liquid flow flows into the rear box 2 through the U-shaped overflow groove 1a and flows out of a liquid outlet port 2b of the rear box 2. Because the rear end of the U-shaped overflow groove 1a crosses the splicing seam of the front box 1 and the rear box 2 and directly extends into the inner cavity of the rear box 2, even if the U-shaped overflow groove is deformed after being used for a long time, the liquid flow of the front box 1 can not leak from the splicing seam of the front box 1 and the rear box 2, and the environment of a wellhead is further ensured.

The top of wall is equipped with the board 1b of bending backward and downwards bending behind the front cabinet, and the upper end of wall before the rear cabinet of board 1b hook of bending, the left side edge of the board 1b of bending is supported and is leaned on the left wall inboard at rear cabinet 2, and the right edge of the board 1b of bending is supported and is leaned on the right wall inboard at rear cabinet 2. The bending plate 1b has a function similar to a hook, and after the rear box 2 is installed, the front box 1 can be directly hung on the rear box 2 through the bending plate 1b, so that the load of an installer for lifting the front box 1 is reduced; the left edge and the right edge of the bending plate 1b are abutted against the left wall and the right wall of the rear box 2, so that the front box 1 is directly positioned in the left-right direction, namely is automatically aligned with the rear box 2, and the installation is quicker and more convenient.

The periphery of the upper part of the front semi-cylinder 3a is provided with a mesh grid 1c, and the front end of the mesh grid 1c is welded on the front wall of the front box 1. The grid 1c may serve as a resting platform for wellhead operations, and liquid may fall directly from the grid 1c into the headbox 1.

As shown in fig. 1 to 4, a splash box 8 is placed in the middle of the deep area of the rear box 2, the upper end and the bottom of the splash box 8 are both open, and a drainage port 8b facilitating liquid to flow out is arranged at the lower part of a wall plate of the splash box 8; the last port of splashproof case 8 is higher than the last port of back case 2, and splashproof case 8 is wide narrow structure and upper portion to the front and back orientation and stretches out down, is equipped with the splashproof piece 8a that the multichannel is inclined to vertical plane and is parallel to each other on the inner chamber cross section of splashproof case 8.

At the oil pipe in-process of playing, if there is more dirty profit water in the oil pipe, when the connection screw thread of oil pipe is being pulled off, have more liquid stream and flow downwards rapidly, directly fall into the box, cause easily and splash. The utility model discloses set up splashproof case 8 directly behind oil pipe, in the moment of disconnecting the connection screw thread, operating personnel pushes oil pipe backward to the top of splashproof case 8, and dirty profit falls into in the splashproof case 8 after the direction of each splashproof piece 8a, can avoid splash, and the dirty profit that falls into splashproof case 8 flows out from the earning outlet 8b of splashproof case 8 bottom, gets into back box 2, and splashproof case 8 is higher than back box 2, is enough to hold the very big liquid stream of instant, ensures that can not spill over from the upper end of splashproof case 8; can greatly reduce environmental pollution, improve the environment of a construction wellhead and have higher environmental benefit.

As shown in fig. 13 and 14, the splash guard pieces 8a are provided in the inner cavity of the splash guard box 8 in two rows, and the upper and lower splash guard pieces 8a are arranged in a staggered manner. The two staggered splash guard pieces 8a can further improve the splash guard effect.

The back wall of splashproof case 8 is laminated with the back wall of back case 2 mutually, and the wall is followed mouthful board 2c by centre gripping at the back case about splashproof case 8, and back case is followed mouthful board 2c and is welded the last edge of wall and extend forward behind the back case. The area of the rear box 2 is relatively large, the depth of the rear area of the rear box is relatively deep, the rear box edge plate 2c is arranged, on one hand, the strength of the rear box 2 can be improved, on the other hand, the splash-proof box 8 is positioned in the left and right directions, the splash-proof box is ensured to be positioned right behind the central hole 4c of the gland, and the offset of the splash-proof box relative to the oil pipe is avoided.

As shown in fig. 15 to 18, the horizontal gland 4 has a stepped cross section with a high center and a low periphery, the gland bolt holes 4d are distributed on the periphery of the horizontal gland 4, two symmetrical half-ring caps 9 are covered on the tops of the bolts, the two half-ring caps 9 are spliced to form a complete ring cap, and the tops of the ring caps are flush with the center of the horizontal gland 4. The central area of the horizontal gland 4 provided with the gland caulking groove 4e is thick in thickness, the periphery of the horizontal gland is thin, and after the bolt is installed, the bolt is covered by the semi-ring sealing cover 9, so that the bolt is arranged in the horizontal gland, the top of the device is kept flat, and the possibility of collision is reduced.

Claims (9)

1. The utility model provides a wellhead assembly of low pressure operation overflow well, includes upper end open-ended box, the back wall bottom of box is equipped with out liquid interface, its characterized in that: the depth of the rear area of the box body is greater than that of the front area of the box body, the bottom wall of the front area is connected with the bottom wall of the rear area through an inclined plate, a cylinder which is connected with the bottom wall of the front area of the box body and penetrates through the bottom wall of the front area of the box body is arranged in the center of the front area of the box body, a horizontal gland is welded in the cylinder, gland bolt holes are uniformly distributed in the outer circumference of the horizontal gland, bolts penetrate through the gland bolt holes to fixedly connect the horizontal gland with an upper flange of a blowout preventer; the vertical plane at the diameter place of horizontal gland left and right sides is cut apart into front cabinet and back box to the box, horizontal gland is cut apart into preceding semicircle gland and the latter half circle gland of symmetry, preceding semicircle barrel and the latter half drum of symmetry are cut apart into to the drum, the left and right sides of semicircle barrel in the front is connected to the back wall of front cabinet, the left and right sides at latter half drum is connected to the preceding wall of back box.

2. A wellhead assembly for a low pressure overflow well according to claim 1, wherein: a rubber core is inserted into an upper port of the blowout preventer, the lower end of the rubber core is inserted into an inner cavity of the blowout preventer, an outward-turned rubber core T-shaped head is arranged at the upper end of the rubber core, the rubber core T-shaped head is seated on a flange of the blowout preventer, concave gland caulking grooves are formed in the lower end faces of the front semicircular gland and the rear semicircular gland, the upper end face of the rubber core T-shaped head is embedded into the gland caulking groove, a downward-protruding rubber core convex ring is arranged on the lower end face of the rubber core T-shaped head, and the rubber core convex ring is embedded into a sealing groove of the flange of the blowout preventer; the center hole of the rubber core and the center hole of the gland are coaxial, the lower part of the center hole of the rubber core is in interference fit with the periphery of the oil pipe, and the upper end of the center hole of the rubber core is provided with a horn mouth.

3. A wellhead assembly for a low pressure overflow well according to claim 2, wherein: the lower terminal surface of preventer flange is equipped with the go-between that forms by two connection semi-rings splice in opposite directions, evenly distributed has a plurality of thickened go-between bosss on the go-between, and the center of each go-between boss is equipped with the go-between screw respectively, and the upper end of each go-between screw is equipped with the horn mouth respectively, and each bolt top-down passes corresponding gland bolt hole and preventer flange bolt hole in proper order and connects soon in corresponding go-between screw.

4. A wellhead assembly for a low pressure overflow well according to claim 3, wherein: the horizontal gland is in a stepped cross section with a high center and a low periphery, the gland bolt holes are distributed on a thin periphery of the horizontal gland, two symmetrical semi-ring sealing covers are covered at the tops of the bolts, the two semi-ring sealing covers are spliced to form a complete circular ring sealing cover, and the tops of the circular ring sealing covers are flush with the center of the horizontal gland.

5. A wellhead assembly for a low pressure overflow well according to claim 1, wherein: the upper part of the rear wall of the front box is welded with a U-shaped overflow groove extending backwards, and the rear end of the U-shaped overflow groove penetrates through the notch of the front wall of the rear box and extends into the inner cavity of the rear box.

6. A wellhead assembly for a low pressure overflow well according to claim 1, wherein: the top of wall is equipped with the board of bending backward and downwards bending behind the front cabinet, the board of bending hooks the upper end of wall before the back cabinet, the left side edge of the board of bending is supported and is leaned on the left wall inboard at the back cabinet, and the right edge of the board of bending is supported and is leaned on the right wall inboard at the back cabinet.

7. A wellhead assembly for a low pressure overflow well according to claim 1, wherein: the periphery of the upper part of the front semi-cylinder is provided with a mesh grid, and the front end of the mesh grid is welded on the front wall of the front box.

8. A wellhead assembly for a low pressure overflow well according to any of claims 1 to 7, in which: a splash-proof box is arranged in the middle of the deep area of the rear box, the upper end and the bottom of the splash-proof box are both open, and a drainage port facilitating liquid to flow out is arranged at the lower part of a wallboard of the splash-proof box; the last port of splashproof case is higher than the last port of back box, the splashproof case is narrow structure and upper portion to the front and lean out under the front and back direction is wide, be equipped with the splashproof piece that the multichannel is inclined to vertical plane and is parallel to each other on the inner chamber cross section of splashproof case.

9. A wellhead assembly for a low pressure overflow well according to claim 8, wherein: the back wall of splashproof case is laminated with the back wall of back case mutually, the wall is by the centre gripping between the back case bead board about the splashproof case, and the back case bead board welds the last edge of wall and extends forward behind the back case.

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