CN111155956A - Double-piston composite double-ram blowout preventer and method for suspending oil pipe and sealing wellhead - Google Patents
Double-piston composite double-ram blowout preventer and method for suspending oil pipe and sealing wellhead Download PDFInfo
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- CN111155956A CN111155956A CN202010066894.XA CN202010066894A CN111155956A CN 111155956 A CN111155956 A CN 111155956A CN 202010066894 A CN202010066894 A CN 202010066894A CN 111155956 A CN111155956 A CN 111155956A
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- 238000007789 sealing Methods 0.000 title claims abstract description 119
- 239000002131 composite material Substances 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 title claims abstract description 10
- 239000000725 suspension Substances 0.000 claims abstract description 144
- 238000010008 shearing Methods 0.000 claims abstract description 76
- 230000007246 mechanism Effects 0.000 claims abstract description 34
- 239000003921 oil Substances 0.000 claims description 54
- 230000009977 dual effect Effects 0.000 claims description 12
- 150000001875 compounds Chemical class 0.000 claims description 10
- 239000010720 hydraulic oil Substances 0.000 claims description 4
- 230000002159 abnormal effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 210000001503 joint Anatomy 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/06—Blow-out preventers, i.e. apparatus closing around a drill pipe, e.g. annular blow-out preventers
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
- E21B19/02—Rod or cable suspensions
- E21B19/06—Elevators, i.e. rod- or tube-gripping devices
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Abstract
The invention discloses a double-piston composite double-ram blowout preventer and a method for suspending an oil pipe and sealing a wellhead, which comprises a shell, wherein a shearing full-seal ram assembly for sealing the wellhead after shearing the oil pipe and a suspending half-seal ram assembly for suspending the oil pipe and sealing the wellhead are symmetrically arranged in the shell from top to bottom; the suspended semi-closed gate plate assembly comprises; the suspension flashboard body is internally provided with a semi-sealed front seal and a floating slip; the semi-seal front seal is connected with a semi-seal piston driving mechanism, and the slips is connected with a suspension piston driving mechanism. The semi-seal front seal and the floating slips are integrated and do not interfere with each other in different labor division when the suspension flashboard is closed, oil pipe suspension and well mouth sealing are achieved, and more importantly, sealing is reliable and continuous oil pipes are not easy to be damaged by clamping.
Description
Technical Field
The invention relates to the technical field of coiled tubing workover, in particular to a double-piston composite double-ram blowout preventer and a method for suspending an oil pipe and sealing a wellhead.
Background
The coiled tubing preventer is well control equipment among the coiled tubing operation process, and the effect is that hydraulic pressure closes the flashboard rapidly, seals well head pressure, prevents the emergence of blowout, and conventional coiled tubing preventer comprises four layers of flashboards, down does from last in proper order: the blowout preventer with the structure comprises a full-closed ram, a shearing ram, a hanging ram and a semi-closed ram, is large in size and high in cost, and is a common composite double-ram blowout preventer, but high-pressure sealing is unreliable, and a continuous oil pipe is easily clamped by slips when the pressure is high, so that the conventional composite double-ram blowout preventer is not widely used in the market.
Disclosure of Invention
In view of the above-mentioned drawbacks or shortcomings, it is an object of the present invention to provide a dual piston compound dual ram blowout preventer and method of suspending tubing and sealing a wellhead; the high-pressure sealing is reliable, and the continuous oil pipe is not easily clamped by the slips when the pressure is high.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
a double-piston composite double-ram blowout preventer comprises a shell, wherein a shearing full-seal ram assembly used for sealing a wellhead after an oil pipe is sheared and a suspension half-seal ram assembly used for suspending the oil pipe and sealing the wellhead are symmetrically arranged in the shell from top to bottom; the suspended semi-closed gate plate assembly comprises; the suspension flashboard body is internally provided with a semi-sealed front seal and a floating slip; the semi-seal front seal is connected with a semi-seal piston driving mechanism, and the floating slips are connected with a suspension piston driving mechanism.
The suspended semi-closed flashboard assembly further comprises a slip pushing block arranged on the rear side of the floating slip.
The mounting surface of the floating slip is in clearance fit with the semi-seal front seal and the suspension flashboard body, the floating slip is positioned above the semi-seal front seal, a limiting hole is formed in the upper end surface of the floating slip, a screw is mounted in the limiting hole, one end of the screw is fixed on the suspension flashboard body, the other end of the screw is positioned in the limiting hole, the limiting hole is in clearance fit with the screw, a slip push block is fixedly connected to the rear side of the floating slip, a gap is reserved between the rear end surface of the floating slip and the suspension flashboard body, and the slip push block is in clearance fit with the suspension flashboard body; the semi-sealed front seal is fixedly connected with the suspension flashboard body.
The second suspension piston driving mechanism comprises a second hydraulic cylinder and a suspension piston rod with an inner cavity structure, one end of the suspension piston rod is matched with the second hydraulic cylinder, the other end of the suspension piston rod is connected with a slip through a slip push block, and a hydraulic cylinder cover is installed at the end head of the second hydraulic cylinder; the second semi-closed piston driving mechanism comprises a semi-closed piston rod, the semi-closed piston rod is connected with the semi-closed front seal through a suspension flashboard body in a sealing mode, the semi-closed piston rod is located in a suspension piston rod cavity, when the semi-closed piston rod is driven, one end of the semi-closed piston rod extends out of an inner cavity of the suspension piston rod to be matched with the suspension flashboard body, and the other end of the semi-closed piston rod is connected with a double-locking device.
The double-locking device comprises a semi-seal jackscrew connected to one end of a semi-seal piston rod, wherein a suspension jackscrew is sleeved on the semi-seal jackscrew, a hand wheel is fixedly connected to one end, away from the semi-seal piston rod, of the suspension jackscrew, the other end of the suspension jackscrew is connected with a piston sleeve, the piston sleeve is sleeved on the outer sides of the semi-seal piston rod and the semi-seal jackscrew, the other end of the piston sleeve is fixedly connected to the end face of an opening of an inner cavity of the suspension piston rod, the piston sleeve is positioned on the inner side of a hydraulic cylinder cover to form a hydraulic cavity, and a through hole is formed in the piston; the suspension jackscrew is externally threaded with a jackscrew seat, and the jackscrew seat is fixedly installed on the outer side of the hydraulic cylinder cover.
The suspension piston rod is T-shaped, the inner cavity structure of the suspension piston rod is T-shaped, the semi-closed piston rod is cross-shaped, and the T-shaped inner cavity of the suspension piston rod is matched with the semi-closed piston rod.
Hang the piston rod and be close to the pot head that hangs the flashboard body and be equipped with the piston and hang, the piston is hung the phase-match cover and is equipped with the flashboard and hang, when the piston was closed, the piston is hung and hang the rear end contact with hanging the flashboard body with the flashboard.
The suspended semi-closed flashboard component also comprises a second top seal circumferentially arranged on the suspended flashboard body, the upper end surface of the slip is provided with a limiting hole, a screw is arranged in the limiting hole, one end of the screw is fixed on the suspended flashboard body, the other end of the screw is positioned in the limiting hole, the outer wall of the slip push block is provided with a sealing groove, and an O-shaped ring is arranged in the sealing groove; the semi-sealed front seal is fixedly arranged on the suspended brake plate body through a key.
The shearing fully-sealed gate plate assembly comprises a left shearing gate plate body and a right shearing gate plate body, wherein shearing blades and sealing pieces are respectively arranged on the left shearing gate plate body and the right shearing gate plate body; the sealing element comprises a full-sealing front seal arranged between the first shearing blade and the left shearing flashboard body and a top seal circumferentially arranged on the left shearing flashboard body and the right shearing flashboard body, and the full-sealing front seal is embedded on the left shearing flashboard body; after an oil pipe is cut off, the right shear flashboard body, the second shear blade and the left shear flashboard body are in matched butt joint sealing, and the left shear flashboard body, the first shear blade and the right shear flashboard body are in matched butt joint sealing.
A double-piston composite double-ram blowout preventer and a method for hanging an oil pipe and sealing a wellhead are disclosed:
1) a suspension piston driving mechanism of the second driving device drives the suspension semi-closed gate plate assembly to move towards the center;
2) the semi-seal piston driving mechanism pushes the semi-seal front seal to firstly centralize and clamp the oil pipe;
3) then the hydraulic pressure of the suspension piston driving mechanism pushes the floating slips to further clamp the oil pipe, so that the oil pipe is suspended, and meanwhile, a well mouth is sealed;
4) when the coiled tubing operates in a well and an emergency situation occurs in the well, the oil tube and the sealing element opening need to be cut off, the first driving device is started to drive the cutting full-sealing flashboard assembly to move towards the center of the well opening, the oil tube is cut off, and the cutting full-sealing flashboard assembly is matched and butted after the oil tube is cut off, so that the well opening is sealed.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a double-piston composite double-ram blowout preventer device.A power control for suspending a semi-closed ram is of a double-piston structure, and slips are pushed to move towards a borehole under the action of hydraulic control; because the semi-closed piston rod is arranged at the inner cavity part of the suspension piston rod, the semi-closed piston rod drives the semi-closed front seal to firstly centralize and clamp the oil pipe, then the suspension piston rod is controlled by hydraulic pressure to drive the slip to further clamp the oil pipe and to suspend and seal the oil pipe, the whole oil pipe is seemed to be divided into different parts and not interfered with each other, meanwhile, when the flashboard is closed, the floating slip is pushed by the slip push block, and the floating design structure of the floating slip with metal rigidity avoids the instant clamping damage to the oil pipe when the wellhead of the floating slip is sealed to contact with the oil pipe when the flashboard is closed, the semi-closed front seal is pushed by the flashboard body to tightly press and seal the oil pipe, and the wellhead is sealed reliably and; the second shearing blade on the right shearing flashboard is designed as a fixed blade, the first shearing blade on the left shearing flashboard body is designed as a floating blade, and the floating blade can continuously compress the full front seal on the rear side after the oil pipe is sheared, so that the sealing is more reliable; the device provided by the invention compresses and limits the suspension piston rod and the semi-closed piston rod through the double locking devices of the suspension semi-closed gate plate assembly, so that the continuity and the good tightness of the suspension gate plate body when the suspension gate plate body is closed and clamped are ensured.
According to the method for hanging the oil pipe and sealing the wellhead, when the flashboard is closed, the semi-seal piston rod of the semi-seal piston driving mechanism is adopted to push the semi-seal front seal to firstly centralize and clamp the oil pipe; then a suspension piston rod of the suspension piston driving mechanism pushes a floating slip to further clamp the oil pipe until the semi-seal front seal and the slip reach the maximum pressing force under the driving of respective corresponding pistons, so that the oil pipe is suspended, a well mouth is sealed at the same time, mutual interference is avoided when a suspension gate plate body is closed and clamped, only the semi-seal front seal is compressed under the well pressure sealing-assisting action, the sealing force is increased, the slip is not compressed, and the high well pressure sealing is reliable and the coiled tubing is not easy to be damaged by clamping; when the coiled tubing operates in a well and the well pressure is abnormal, the tubing and the sealing element opening need to be cut off, the first driving device is started to drive the cutting full-sealing flashboard assembly to move towards the center of the well opening and cut off the tubing, and the floating blade can continue to compress for sealing after the tubing is cut off, so that the sealing is more reliable.
Drawings
FIG. 1 is a schematic front view of the apparatus of the present invention;
FIG. 2 is a schematic top view of the apparatus of the present invention;
FIG. 3 is a schematic left side view of the apparatus of the present invention;
FIG. 4 is a schematic structural view of a suspended semi-enclosed shutter assembly of the apparatus of the present invention;
FIG. 5 is a schematic diagram of the shear blind ram and assembly of the apparatus of the present invention;
fig. 6 is a schematic structural view of the suspended end cap half and assembly of the device of the present invention.
In the drawings, 1 — a housing; 2-shearing the full-sealing gate plate component; 3-side flange assembly; 4-a balanced valve assembly; 5, hanging a semi-closed gate plate assembly; 6, hanging a flashboard; 7, hanging a piston; 8, hanging a half-sealed end cover; 9-shearing the full end cover; 21-left shear ram body; 22-right shear ram body; 23-top sealing; 24-sealing before full sealing; 25-a shearing blade; 26-screw; 51-a suspended ram body; sealing before half sealing; 53-second top seal; 54-floating slips; a 55-bond; 56-a slip pushing block; 57-screw; 58-O-ring; 801-hanging piston rod; 802-slide bar hydraulic cylinder; 803-a slide bar; 804-hydraulic cylinder; 805-hydraulic cylinder heads; 806-a jackscrew seat; 807-hanging a jackscrew; 808-handwheel; 809-half seal top thread; 810-a piston sleeve; 811-half seal piston rod.
Detailed Description
The present invention will now be described in detail with reference to the drawings, wherein the described embodiments are only some, but not all embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, belong to the scope of the present invention.
As shown in fig. 1-6, a double-piston composite double-ram blowout preventer comprises a housing 1, wherein a shearing full-seal ram assembly 2 for sealing a wellhead after shearing a tubing and a suspension half-seal ram assembly 5 for suspending the tubing and sealing the wellhead are symmetrically installed in the housing 1 from top to bottom, the shearing full-seal ram assembly 2 is connected with a first driving device and a locking device, the suspension half-seal ram assembly 5 is connected with a second driving device and a double-locking device for compressing and fixing a half-seal piston rod 811 and a suspension piston rod 801, and the second driving device comprises a suspension piston driving mechanism and a half-seal piston driving mechanism; the hanging semi-closed shutter plate assembly 5 comprises; a suspended gate plate body 51, wherein a semi-sealed front seal 52 and a floating slip 54 are arranged in the suspended gate plate body 51; the front half seal 52 is connected to a half seal piston drive mechanism and the floating slips 54 are connected to a suspended piston drive mechanism. Preferably, the suspended semi-closed ram assembly 5 further comprises a slip pusher block 56 disposed behind the floating slips 54. It should be noted that the mounting surface of the floating slip 54 is in clearance fit with the semi-sealed front seal 52 and the suspended gate body 51, the floating slip 54 is located above the semi-sealed front seal 52, the upper end surface of the floating slip 54 is provided with a limiting hole, a screw 57 is arranged in the limiting hole, one end of the screw 57 is fixed to the suspended gate body 51, the other end of the screw is located in the limiting hole, the rear side of the floating slip 54 is fixedly connected with a slip push block 56, a gap is reserved between the rear end surface of the floating slip 54 and the suspended gate body 51, the slip push block 56 is in clearance fit with the suspended gate body 51, and the clamping surface at the front end of the floating slip 54 is a granular tooth; the semi-sealed front seal 52 is fixedly connected with the suspended shutter body 51. The suspended semi-closed gate plate assembly 5 is driven by a double-piston structure, and in the first stage: because the semi-sealed piston rod 811 is arranged in the inner cavity of the suspension piston rod 801, the cross-shaped semi-sealed piston rod 811 is matched with the inner cavity of the T-shaped suspension piston rod 801, the hydraulic end cavity of the suspension piston rod 801 has a clearance for the movement of the semi-sealed piston rod 811, when hydraulic pressure acts, hydraulic oil enters a hydraulic oil cavity on the outer side of the piston sleeve 810 through an oil way in the hydraulic cylinder cover 805, then enters a cavity of the suspension piston rod 801 through a through hole in the piston sleeve 810 to act on the half-sealed piston rod 811, the half-sealed piston rod 811 moves in the suspension piston rod 801 firstly, when the end face of the cavity at the hydraulic end of the suspension piston rod 801 is in contact with the end face of the semi-sealed piston rod 811, and the suspension piston rod 801 moves in the second hydraulic cylinder 804, the suspension piston rod 801 and the semi-sealed piston rod 811 simultaneously drive the suspension semi-sealed gate plate assembly 5 to move towards the center, and the semi-sealed front seal 52 firstly centralizes and clamps the oil pipe; in the second stage, because the semi-sealed front seal 52 is a rubber semi-sealed front seal, the semi-sealed front seal 52 has a certain amount of compression and expansion, the semi-sealed piston rod 811 is controlled by hydraulic pressure to drive the semi-sealed front seal 52 to increase the extrusion force on the oil pipe, and the floating slips 54 in the suspended semi-sealed gate plate assembly 5 are designed, the hydraulic pressure continuously controls the suspended piston rod 801 to drive the floating slips 54 to further clamp the oil pipe until the semi-sealed front seal 52 and the floating slips 54 reach the maximum pressing force under the driving of the corresponding pistons, so the double-piston driving structure looks like an integral structure but has division and mutual noninterference, meanwhile, the floating slips 54 are driven by the suspended piston driving mechanism through the slip push block 56 when the suspended gate plate body 51 is closed, the semi-sealed front seal 52 is driven by the semi-sealed piston rod through the suspended gate plate body 51, and mutual noninterference when the, the semi-seal front seal 52 is compressed under the well pressure sealing-assisting effect, the floating slip 54 is not compressed when the sealing pressure is increased, and therefore the high well pressure sealing is reliable and the coiled tubing is not easy to be damaged by clamping.
In the invention, the second suspension piston driving mechanism comprises a second hydraulic cylinder 804 and a suspension piston rod 801 with an inner cavity structure, one end of the suspension piston rod 801 is matched with the second hydraulic cylinder 804, the other end of the suspension piston rod 801 is connected with a floating slip 54 through a slip push block 56, a hydraulic cylinder cover 805 is installed at the end head of the hydraulic cylinder 804, and a hydraulic oil way is arranged in the hydraulic cylinder cover 805; the second half-sealing piston driving mechanism comprises a half-sealing piston rod 811, wherein the half-sealing piston rod 811 is connected with a half-sealing front seal 52 through a suspension shutter body 51, the half-sealing piston rod 811 is located in a suspension piston rod 801 cavity, when the half-sealing piston rod 811 is driven, one end of the half-sealing piston rod 811 extends out of an inner cavity of the suspension piston rod 801 to be matched with the suspension shutter body 51, and the other end of the half-sealing piston rod 811 is connected with a double-locking device.
Further, the suspension piston rod 801 is T-shaped, the inner cavity structure of the suspension piston rod 801 is T-shaped, the semi-sealed piston rod 811 is cross-shaped, and the T-shaped inner cavity of the suspension piston rod 801 is matched with the semi-sealed piston rod 811. Preferably, the piston hangs 7 to hang the pot head that piston rod 801 is close to hanging the ram body 51, the matching pot head is equipped with the ram and hangs 6 on the piston hangs 7, and when the piston was closed, the piston hung 7 and the ram hung 6 and hangs the rear end contact of ram body 51.
The double-locking device comprises a half-sealing jackscrew 809 connected to one end of a half-sealing piston rod 811, wherein a suspension jackscrew 807 is sleeved on the half-sealing jackscrew 809, an internal thread of the suspension jackscrew 807 is matched with an external thread of the half-sealing jackscrew 809, a hand wheel 808 is fixedly connected to one end, away from the half-sealing piston rod 811, of the suspension jackscrew 807, the other end of the suspension jackscrew 807 is connected with a piston sleeve 810, the piston sleeve 810 is sleeved on the outer sides of the half-sealing piston rod 811 and the half-sealing jackscrew 809, the other end of the piston sleeve 810 is fixedly connected to the end face of an opening of an inner cavity of the suspension piston rod 801, the piston sleeve 810 is positioned on the inner side of a hydraulic cylinder cover 805 to form a hydraulic cavity, and a through hole is formed in the piston; the suspension jackscrew 807 is externally threaded with a jackscrew seat 806, and the jackscrew seat 806 is fixedly installed on the outer side of the hydraulic cylinder cover 805. When the suspension piston rod 801 and the half-sealed piston rod 811 reach the maximum pressing force through hydraulic pressure, a hand wheel 808 is rotated, the suspension jackscrew 807 is in external thread fit with the jackscrew seat 806, so that the suspension jackscrew 807 can rotate, feed and move, the acting force of the suspension jackscrew 807 is applied to the piston sleeve 810, and the piston sleeve 810 is enabled to compress and limit the suspension piston rod 801 to realize locking; the tool is used for rotating the half-capping thread 809, the suspended top thread 807 is in threaded fit with the half-capping thread 809, the half-capping thread 809 compresses the half-capping piston rod 811 to limit, and locking is achieved.
Preferably, the suspended semi-closed gate plate assembly 5 further comprises a second top seal 53 circumferentially mounted on the suspended gate plate body 51, a sealing groove is formed in the outer wall of the slip push block 56, and an O-shaped ring 58 is mounted in the sealing groove; the front half seal 52 is fixedly mounted to the suspended ram body 51 by a key 55.
In the invention, the shearing fully-closed gate plate assembly 2 comprises a left shearing gate plate body 21 and a right shearing gate plate body 22 which are matched with each other, wherein shearing blades and sealing pieces are respectively installed on the left shearing gate plate body 21 and the right shearing gate plate body 22, the sealing pieces are rubber sealing pieces, each shearing blade comprises a first shearing blade 25 and a second shearing blade 27, each second shearing blade 27 is fixedly installed on the right shearing gate plate body 22 through a screw 26, each first shearing blade 25 is installed on the left shearing gate plate body 21 through a screw 26 in a floating manner, a screw hole in each first shearing blade 25 is in clearance fit with the screw 26, and each first shearing blade 25 is located at the lower end of the corresponding second shearing blade 27; the sealing member includes seal 24 before installing in sealing before the whole between first shear blade 25 and the left shear ram body 21 to and circumference set up the top seal 23 on the left shear ram body 21 and the right shear ram body 22, just seal 24 is installed on the left shear ram body 21 in an embedded manner before sealing completely. When the left shear ram body 21 and the right shear ram body 22 move toward the center to shear the oil pipe, the first shear blade 25 and the second shear blade 27 slide relatively, the contact surfaces are in close contact, after the oil pipe is cut off, the right shear ram body 22 and the second shear blade 27 are matched with the left shear ram body 21 for butt joint and sealing, the left shear ram body 21 and the first shear blade 25 are matched with the right shear ram body 22 for butt sealing, due to the floating installation structure of the first cutting blade 25, when the first cutting blade 25 is pressed in abutment with the right cutting shutter body 22, the full-sealing front seal 24 is pressed against the full-sealing front seal 24, the sealing pressure of the contact surface of the full-sealing front seal 24 and the right shear ram body 22 is increased, the sealing is more reliable, meanwhile, the right shear ram body 22 can be protected from being damaged by the first shear blade 25, and the phenomenon of blade breakage can be avoided.
The shear full-seal gate assembly 2 and the suspension half-seal gate assembly 5 are installed in the shell 1, shear full-seal end covers 9 and suspension half-seal end covers 8 are symmetrically installed on two sides of the shell, the shear full-seal end covers 9 and the suspension half-seal end covers 8 are both connected with hydraulic mechanisms, each hydraulic mechanism comprises a hydraulic cylinder and a piston rod, one end of each piston rod is connected with the hydraulic cylinder, and the other end of each piston rod is connected with the shear full-seal gate assembly 2 or the suspension half-seal gate assembly 5; the suspended semi-closed gate plate assembly 5 comprises a suspended gate plate body 51, a semi-closed front seal 52 and a floating slip 54, wherein a slip pushing block 56 is installed on the floating slip 54 in a matching manner; the piston rod cooperating with the suspension half end cap 8 comprises a half piston rod 811 for driving the half front seal 52 and a suspension piston rod 801 for driving the floating slips 54; the invention can suspend and seal the oil pipe, which looks like the whole, but has separate labor and is not interfered with each other, the sealing is reliable and the coiled oil pipe is not easy to be damaged.
Further, casing 1 is the cuboid, and the center has an axial through hole, 1 top-down of casing radially sets up two radial through holes that are parallel to each other, two radial through hole all is linked together with the axial through hole. The inner side of the shearing full-sealing end cover 9 is provided with a first groove and a first through hole, the first groove is communicated with the first through hole, the inner side of the suspension half-sealing end cover 8 is provided with a second groove and a second through hole, and the second groove is communicated with the second through hole; the first groove of the shearing full-sealing end cover 9 and the second groove of the suspension half-sealing end cover 8 are respectively communicated with two radial through holes of the shell 1; the first groove of the shearing full-sealing end cover 9 is matched with the shearing full-sealing flashboard component 2, and the second groove of the suspension half-sealing end cover 8 is matched with the suspension half-sealing flashboard component 5.
The first driving device comprises a first hydraulic cylinder and a first piston rod, the first piston rod is matched with the first hydraulic cylinder, one end of the first piston rod is connected with a right shearing flashboard body 22 and a left shearing flashboard body 21 of the shearing fully-sealed flashboard assembly 2 through a first through hole of the shearing fully-sealed end cover 9, and preferably, the other end of the first piston rod is connected with a locking device; specifically, the locking device comprises a piston rod jackscrew which is in threaded connection with one end of the first piston rod, a jackscrew seat is sleeved on the piston rod jackscrew, and the jackscrew seat is fixedly arranged on the outer side of a hydraulic cylinder cover of the first hydraulic cylinder; the first driving device and the second driving device further comprise a sliding rod 803 and a sliding rod hydraulic cylinder 802 which are used for guiding, one end of the sliding rod hydraulic cylinder 802 on the second driving device is connected with the suspension half-end cover 8, one end of the sliding rod hydraulic cylinder 802 on the first driving device is connected with the shearing full-end cover 9, the other end of the sliding rod hydraulic cylinder 802 is connected with a hydraulic cylinder cover 805, the sliding rod 803 is located in a cavity of the sliding rod hydraulic cylinder 802, one end of the sliding rod 803 is connected with the hydraulic cylinder cover 805, and the other end of the sliding rod 803 penetrates through the suspension half-end cover 8 or the shearing full-end cover 9 to be; the second hydraulic cylinder 804 is located inside the slide rod hydraulic cylinder 802, and the suspension piston rod 801 is located between the set of second hydraulic cylinders 804.
In addition, both sides of the device are also provided with a side flange component 3 for pumping and returning liquid and a balance valve component 4 for balancing the pressure of the upper cavity and the lower cavity of the flashboard; the side flange assembly 3 is used for shearing the oil pipe by using a shearing flashboard when special conditions such as abnormal well pressure and the like occur when the coiled oil pipe works in a well and the oil pipe needs to be sheared, and simultaneously, the well is sealed by using a full-sealing flashboard, and a manifold connected with the side flange is pumped into a liquid kill well; the balance valve assembly 4 is used for opening the blowout preventer after the balance valve is opened to balance the upper pressure and the lower pressure of the ram body when the blowout preventer needs to be opened.
The working principle of the invention is as follows:
a double piston compound double ram blowout preventer comprises a suspended half ram assembly 5, a shearing full ram assembly 2 and a suspended half ram assembly. The suspended semi-closed gate assembly 5 and the shearing fully-closed gate assembly 2 are arranged in a gate cavity of a shell 1 of the blowout preventer, the suspended semi-closed gate assembly 5 is used for suspending an oil pipe and sealing a well mouth when a coiled oil pipe exists in a well, the suspended semi-closed front seal and the suspended slip are respectively driven by a slip push block and a gate body, and the shearing fully-closed gate assembly 2 is used for sealing the well mouth after shearing off the oil pipe; the suspension semi-sealing cover assembly is of a double-piston structure, and the suspension semi-sealing flashboard is pushed to move towards the direction of a well hole under the action of hydraulic control force.
Casing 1 passes through flange mounting on the wellhead assembly, and when coiled tubing was in the operation, available half flashboard shut-in that hangs that corresponds the specification, the first stage: when hydraulic pressure acts, the half-sealed piston rod 811 moves in the suspension piston rod 801 firstly, and then the suspension piston rod 801 moves in the second hydraulic cylinder 804, the suspension piston rod 801 and the half-sealed piston rod 811 drive the suspension half-sealed composite gate plate body 5 to move towards the center at the same time, and the half-sealed front seal 52 firstly centralizes and clamps the oil pipe; in the second stage, after the extrusion force of the semi-seal front seal 52 on the oil pipe is increased, the hydraulic pressure continuously controls the suspension piston rod 801 to drive the floating slip 54 to further clamp the oil pipe until the suspension and the semi-seal reach the maximum pressing force under the drive of the respective corresponding pistons, so that the double-piston drive structure looks like a whole but has separate work and does not interfere with each other, meanwhile, when the suspension ram body 51 is closed, the slip 54 is driven by the suspension piston drive mechanism through the slip push block 56, the semi-seal front seal 52 is driven by the semi-seal piston rod mechanism through the suspension ram body 51, when the suspension ram body 51 is closed and clamped, the non-interference occurs, the semi-seal front seal 52 is compressed under the well pressure sealing assisting effect, the sealing pressure is increased, the floating slip is not compressed, and the high well pressure sealing is reliable and the continuous oil pipe; when the coiled tubing operates in a well, and when abnormal conditions occur in the well and the tubing and a sealing part opening need to be cut off, a first driving device is started to control the left shearing gate plate body 21 and the right shearing gate plate body 22 of the shearing full-sealing gate plate assembly 2 to move towards the center of the well mouth at the same time, so that the shearing blade 25 cuts off the tubing, the top seal 23 on the left shearing gate plate body 21 and the right shearing gate plate body 22 is tightly attached to the sealing surface of the gate plate cavity of the shell 1, the top seal 23 and the full-sealing front seal 24 jointly act to realize sealing, and the pressure of the well bore is controlled.
A double-piston composite double-ram blowout preventer and a method for hanging an oil pipe and sealing a wellhead are disclosed:
1) a suspension piston driving mechanism of the second driving device drives the suspension semi-closed gate plate assembly 5 to move towards the center; specifically, due to the structure that the half-sealed piston rod 811 is arranged in the inner cavity of the suspension piston rod 801, when hydraulic pressure acts, the half-sealed piston rod 811 moves in the suspension piston rod 801 firstly, when the hydraulic end of the half-sealed piston rod 811 contacts with the end face of the cavity of the suspension piston rod 801, the other end of the half-sealed piston rod 811 extends out of the inner cavity of the suspension piston rod 801 for a distance, and then the suspension piston rod 801 and the half-sealed piston rod 811 drive the suspension half-sealed composite shutter body 5 to move towards the center simultaneously;
2) a semi-seal piston rod 811 of the semi-seal piston driving mechanism pushes the semi-seal front seal 52 to firstly centralize and clamp the oil pipe;
3) then a suspension piston rod 801 of the suspension piston driving mechanism pushes the floating slips 54 to further clamp the oil pipe until the semi-sealed front seal 52 and the slips 54 reach the maximum pressing force under the driving of respective corresponding pistons, so that the oil pipe is suspended, and meanwhile, a well mouth is sealed;
4) when the coiled tubing operates in a well and an emergency situation occurs in the well, the tubing needs to be cut off and the well mouth needs to be sealed, the first driving device is started to drive the cutting fully-sealed gate plate assembly 2 to move towards the center of the well mouth and cut off the tubing, and the reaction force of a floating blade on the cutting fully-sealed gate plate assembly 2 can continuously extrude and compress the fully-front seal 24 on the rear side after the tubing is cut off, so that the sealing is more reliable; while the floating blade protects the front seal 24 from damage during movement toward the center of the wellhead.
It will be appreciated by those skilled in the art that the above embodiments are merely preferred embodiments of the invention, and thus, modifications and variations may be made in the invention by those skilled in the art, which will embody the principles of the invention and achieve the objects and objectives of the invention while remaining within the scope of the invention.
Claims (10)
1. The double-piston composite double-ram blowout preventer is characterized by comprising a shell (1), wherein a shearing full-seal ram assembly (2) for sealing a wellhead after an oil pipe is sheared and a suspension semi-seal ram assembly (5) for suspending the oil pipe and sealing the wellhead are symmetrically installed in the shell (1) from top to bottom, the shearing full-seal ram assembly (2) is connected with a first driving device, the suspension semi-seal ram assembly (5) is connected with a second driving device, and the second driving device comprises a suspension piston driving mechanism and a semi-seal piston driving mechanism; the suspended semi-closed gate plate assembly (5) comprises; the device comprises a suspension gate plate body (51), wherein a semi-seal front seal (52) and a floating slip (54) are installed in the suspension gate plate body (51); the semi-seal front seal (52) is connected with a semi-seal piston driving mechanism, and the floating slips (54) are connected with a suspension piston driving mechanism.
2. A dual piston compound dual ram blowout preventer according to claim 1, wherein the suspended semi-closed ram assembly (5) further comprises a slip pusher (56) disposed behind the floating slips (54).
3. The double-piston composite double-ram blowout preventer according to claim 1 or 2, wherein the mounting surface of the floating slip (54) is in clearance fit with the semi-seal front seal (52) and the suspension ram body (51), the floating slip (54) is positioned above the semi-seal front seal (52), a limiting hole is formed in the upper end surface of the floating slip (54), a screw (57) is installed in the limiting hole, one end of the screw (57) is fixed to the suspension ram body (51), the other end of the screw is positioned in the limiting hole, the limiting hole is in clearance fit with the screw (57), a slip push block (56) is fixedly connected to the rear side of the floating slip (54), a gap is reserved between the rear end surface of the floating slip (54) and the suspension ram body (51), and the slip push block (56) is in clearance fit with the suspension ram body (51); the semi-sealed front seal (52) is fixedly connected with the suspension shutter body (51).
4. The double-piston compound double-ram blowout preventer according to claim 1 or 2, wherein the second suspension piston driving mechanism comprises a second hydraulic cylinder (804) and a suspension piston rod (801) with an inner cavity structure, one end of the suspension piston rod (801) is matched with the second hydraulic cylinder (804), the other end of the suspension piston rod is connected with a slip (54) through a slip pushing block (56), a hydraulic cylinder cover (805) is installed at the end of the second hydraulic cylinder (804), and a hydraulic oil path is arranged in the hydraulic cylinder cover (805); the second half-sealing piston driving mechanism comprises a half-sealing piston rod (811), wherein the half-sealing piston rod (811) is connected with a half-sealing front seal (52) through a suspension shutter body (51), the half-sealing piston rod (811) is positioned in a suspension piston rod (801) cavity, when the half-sealing piston rod (811) is driven, one end of the half-sealing piston rod (811) extends out of the suspension piston rod (801) cavity to be matched with the suspension shutter body (51), and the other end of the half-sealing piston rod (811) is connected with a double-locking device.
5. A dual piston compound dual ram blowout preventer according to claim 4, the double-locking device comprises a half-seal jackscrew (809) connected with one end of a half-seal piston rod (811), a suspension jackscrew (807) is sleeved on the half-sealing jackscrew (809), one end of the suspension jackscrew (807) far away from the half-sealing piston rod (811) is fixedly connected with a hand wheel (808), the other end of the suspension jackscrew (807) is connected with a piston sleeve (810), and the piston sleeve (810) is sleeved outside the half-seal piston rod (811) and the half-seal jackscrew (809), the other end of the piston sleeve (810) is fixedly connected with the end surface of the opening of the inner cavity of the suspension piston rod (801), and the piston sleeve (810) is positioned on the inner side of the hydraulic cylinder cover (805) to form a hydraulic cavity, the piston sleeve (810) is provided with a through hole which communicates the cavity of the suspension piston rod (801) with the hydraulic cavity; the suspension jackscrew (807) is externally connected with a jackscrew seat (806), and the jackscrew seat (806) is fixedly installed on the outer side of the hydraulic cylinder cover (805).
6. The double-piston compound double-ram blowout preventer according to claim 4, wherein the suspension piston rod (801) is T-shaped, the inner cavity structure of the suspension piston rod (801) is T-shaped, the semi-closed piston rod (811) is cross-shaped, and the T-shaped inner cavity of the suspension piston rod (801) is matched with the semi-closed piston rod (811).
7. The dual piston compound dual ram blowout preventer according to claim 4 or 6, wherein the end of the suspension piston rod (801) close to the suspension ram body (51) is sleeved with a piston hanger (7), the piston hanger (7) is sleeved with a ram hanger (6) in a matching manner, and when the piston is closed, the piston hanger (7) and the ram hanger (6) are in contact with the rear end of the suspension ram body (51).
8. The double-piston compound double ram blowout preventer according to claim 1 or 2, wherein the suspended semi-closed ram assembly (5) further comprises a second top seal (53) circumferentially mounted on the suspended ram body (51), wherein a sealing groove is formed in the outer wall of the slip push block (56), and an O-ring (58) is mounted in the sealing groove; the semi-sealed front seal (52) is fixedly arranged on the suspended brake plate body (51) through a key (55).
9. The dual piston compound dual ram blowout preventer of claim 1, wherein the shear blind ram assembly (2) comprises a left shear ram body (21) and a right shear ram body (22), each of the left shear ram body (21) and the right shear ram body (22) having shear blades and seals mounted thereon, the shear blades comprising a first shear blade (25) and a second shear blade (27), the second shear blade (27) being fixedly mounted on the right shear ram body (22) by a screw (26), the first shear blade (25) being float mounted on the left shear ram body (21) by a screw (26), the screw hole on the first shear blade (25) being clearance fit with the screw (26); the sealing element comprises a full-sealing front seal (24) arranged between a first shearing blade (25) and a left shearing flashboard body (21) and a top seal (23) circumferentially arranged on the left shearing flashboard body (21) and a right shearing flashboard body (22), and the full-sealing front seal (24) is mounted on the left shearing flashboard body (21) in an embedded mode; after an oil pipe is cut off, the right shearing gate body (22) and the second shearing blade (27) are matched, butted and sealed with the left shearing gate body (21), and the left shearing gate body (21) and the first shearing blade (25) are matched, butted and sealed with the right shearing gate body (22).
10. A method of suspending tubing and sealing a wellhead based on the dual piston compound dual ram blowout preventer of claim 1:
1) a suspension piston driving mechanism of the second driving device drives the suspension semi-closed gate plate assembly (5) to move towards the center;
2) the semi-seal piston driving mechanism pushes a semi-seal front seal (52) to firstly centralize and clamp the oil pipe;
3) then the hydraulic pressure of the suspension piston driving mechanism pushes a floating slip (54) to further clamp the oil pipe, so that the oil pipe is suspended, and meanwhile, a well mouth is sealed;
4) when the coiled tubing operates in the well and an emergency situation occurs in the well, the tubing and the sealing element opening need to be cut off, the first driving device is started to drive the cutting full-sealing flashboard assembly (2) to move towards the center of the well opening, the tubing is cut off, and the cutting full-sealing flashboard assembly (2) is matched and butted after the tubing is cut off, so that the well opening is sealed.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010066894.XA CN111155956A (en) | 2020-01-20 | 2020-01-20 | Double-piston composite double-ram blowout preventer and method for suspending oil pipe and sealing wellhead |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010066894.XA CN111155956A (en) | 2020-01-20 | 2020-01-20 | Double-piston composite double-ram blowout preventer and method for suspending oil pipe and sealing wellhead |
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| CN111155956A true CN111155956A (en) | 2020-05-15 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111927374A (en) * | 2020-09-09 | 2020-11-13 | 中国石油天然气集团有限公司 | Continuous oil pipe wellhead suspension sealing device |
| CN113914798A (en) * | 2020-07-08 | 2022-01-11 | 中国石油天然气股份有限公司 | Device for drilling fluid circulation system |
| CN114458188A (en) * | 2022-01-14 | 2022-05-10 | 四川宝石机械钻采设备有限责任公司 | Cutting flashboard for belt press working machine |
| CN114482902A (en) * | 2021-12-17 | 2022-05-13 | 建湖县昊辉电力石化机械有限公司 | Blowout preventer capable of being cut off quickly for oil drilling and using method of blowout preventer |
| CN114876401A (en) * | 2022-06-20 | 2022-08-09 | 易初机械装备有限公司 | Coiled tubing blowout preventer and use method thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113914798A (en) * | 2020-07-08 | 2022-01-11 | 中国石油天然气股份有限公司 | Device for drilling fluid circulation system |
| CN113914798B (en) * | 2020-07-08 | 2024-03-26 | 中国石油天然气股份有限公司 | Device for drilling fluid circulation system |
| CN111927374A (en) * | 2020-09-09 | 2020-11-13 | 中国石油天然气集团有限公司 | Continuous oil pipe wellhead suspension sealing device |
| CN111927374B (en) * | 2020-09-09 | 2022-11-29 | 中国石油天然气集团有限公司 | Continuous oil pipe wellhead suspension sealing device |
| CN114482902A (en) * | 2021-12-17 | 2022-05-13 | 建湖县昊辉电力石化机械有限公司 | Blowout preventer capable of being cut off quickly for oil drilling and using method of blowout preventer |
| CN114458188A (en) * | 2022-01-14 | 2022-05-10 | 四川宝石机械钻采设备有限责任公司 | Cutting flashboard for belt press working machine |
| CN114876401A (en) * | 2022-06-20 | 2022-08-09 | 易初机械装备有限公司 | Coiled tubing blowout preventer and use method thereof |
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