CN115929234B - Pressure testing anchoring integrated screw pump anchor - Google Patents
Pressure testing anchoring integrated screw pump anchor Download PDFInfo
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- CN115929234B CN115929234B CN202310218322.2A CN202310218322A CN115929234B CN 115929234 B CN115929234 B CN 115929234B CN 202310218322 A CN202310218322 A CN 202310218322A CN 115929234 B CN115929234 B CN 115929234B
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Abstract
The invention relates to the technical field of screw pump anchors, in particular to a pressure testing and anchoring integrated screw pump anchor, which is characterized in that a pressure testing valve ball, a ball seat, a pressure testing shear pin, a pressure testing locking block and a pressure releasing seat are arranged, when an oil pipe of a pump truck is connected and is pressed, the pressure testing valve ball pushes the ball seat to descend and shear the pressure testing shear pin, and simultaneously releases the pressure testing locking block, so that a valve cover and the pressure releasing seat relatively displace, the outer end of the ball seat is enabled to be in sealing failure when a rotary pipe column set is set, the oil jacket is communicated, thereby completing the pressure testing process.
Description
Technical Field
The invention relates to the technical field of screw pump anchors, in particular to a pressure testing and anchoring integrated screw pump anchor.
Background
With the wide application of screw pumps, the problems of pressure test and pipe column anchoring of the screw pump well pipe column are more and more prominent.
The method for testing the pressure of the well string of the screw pump is as follows: 1. starting up to hold pressure after the pipe column and the rod column are put down to test the pressure of the pipe column, and lifting the pipe column to cause repeated operation if the pressure test is not qualified; 2. and after the pressure test of the pipe column is qualified by the lower pressure test valve, the pipe column is pulled out, and then the screw pump is lowered, so that two pipe column completions are needed.
Common screw pump anchors fall into two categories: the compression anchor shaping and the rotation anchor shaping are carried out, the compression anchor shaping uses the pipe column suspended weight to compress the anchor tile to extend and anchor, for example, chinese patent application No. CN200720014657.9 discloses a 'lifting screw pump anchor', and the rotation anchor shaping screw pump anchor uses a forward rotation oil pipe to extend and anchor the anchor tile, for example, chinese patent application No. CN201310472080.6 discloses a 'torque anchor' and Chinese patent application No.: CN202110828684 discloses a "rotary screw pump anchor", but the three screw pump anchors only have the function of anchoring the pipe column, and cannot realize the pressure test of the pipe column, so a tool capable of realizing the completion of the pressure test of the oil pipe and the anchoring of the pipe column by one pipe column is required.
Disclosure of Invention
Therefore, the invention aims to provide a pressure test anchoring integrated screw pump anchor, which solves the problem that the traditional pump anchor only has the function of anchoring a pipe column and cannot realize pipe column pressure test.
According to the pressure test anchoring integrated screw pump anchor, the pressure test anchoring integrated screw pump anchor comprises a valve cover, an upper joint, a lower joint and a central tube, wherein the lower part of the central tube is connected with the lower joint through a locking tube, the upper joint is sleeved on the upper part of the valve cover, the valve cover comprises a sealing section and a pressure relief cavity, a ball seat capable of sliding relatively is arranged on the inner side of the valve cover, the valve cover and the ball seat are limited through a pressure test shear pin, a pressure test valve ball is arranged on the ball seat, a limiting plate for limiting the descending distance of the ball seat is arranged below the ball seat, a sealing ring for sealing between the ball seat and the valve cover is arranged on the upper part of the ball seat, and a pressure relief hole for communicating with the pressure relief cavity is formed in the lower part of the valve cover, a pressure relief seat is connected between the pressure relief seat and the valve cover, the pressure test seat is locked through a pressure test locking block, and one end of the pressure test locking block is contacted with the ball seat and can be released after the ball seat moves to a designated position;
the bottom of the pressure relief seat is connected with a torsion pipe, the outer diameter of the torsion pipe is connected with a torsion joint through a key groove structure, the lower part of the torsion joint is connected with a thrust pipe, the lower part of the thrust pipe is connected with a compression joint through a thrust joint, the compression joint is in threaded connection with the central pipe, the outer side of the lower part of the central pipe is provided with a cone, the cone is limited on the central pipe through an anchoring shear pin, an anchor tile is arranged below the cone, the anchor tile is seated on an anchor tile support, the anchor tile support is locked on the central pipe through an anchor unlocking locking block, and the lower part of the central pipe is also provided with an auxiliary anchoring part for fixing the anchor tile support;
the inner side of the torsion tube is connected with a deblocking part for driving the anchor to collapse and remove the anchor.
Preferably, the deblocking part comprises an upper bearing joint and a lower bearing joint which are connected to the inner side of the torsion tube, the upper bearing joint is connected with a deblocking tube, the deblocking tube is locked with the central tube through a release locking piece, the lower part of the deblocking tube is connected with a deblocking ring, and the deblocking ring is movably arranged on one side of the deblocking locking piece;
the inner diameter of the lower part of the thrust tube is smaller than that of the upper part, so that the lower part is released from the release locking piece when being positioned at the release locking piece, and the upper part is released from the release locking piece when being positioned at the release locking piece.
Preferably, a compression spring is arranged between the compression joint and the cone, and the compression spring is used for setting the distance between the compression joint and the cone, so that when the compression joint is in contact with the cone, the upper part of the thrust tube moves to the release locking piece.
Preferably, the compression spring is provided with a spring jacket on the peripheral side.
Preferably, the auxiliary anchoring part comprises an auxiliary friction block and an auxiliary anchor shoe which are connected to the outer side of the lower part of the central tube, wherein the auxiliary friction block is used for enabling one end of the auxiliary anchor shoe to be fixed and the other end of the auxiliary anchor shoe to expand when the auxiliary friction block is rubbed.
Preferably, the key slot structure comprises at least four key slots arranged on the outer diameter of the torsion tube and torsion nails embedded in the key slots.
Preferably, the outer diameter of the lower part of the ball seat is larger than that of the upper part, so that the lower part is contacted with the pressure test locking piece when being positioned at the pressure test locking piece, and the upper part is released when being positioned at the pressure test locking piece.
Preferably, the pressure relief seat is sleeved with a pressure cap.
The invention has the beneficial effects that: through setting up pressure testing valve ball, the ball seat, the pressure testing shear pin, pressure testing locking piece and pressure release seat, when connect pump truck oil pipe to just beat and press, pressure testing valve ball promotes the ball seat and descends and cut the pressure testing shear pin, release pressure testing locking piece simultaneously, make valve housing and pressure release seat relative displacement, the sealed inefficacy of ball seat outer end is gone up in the valve housing when rotatory tubular column group is set, accomplish the oil jacket intercommunication, thereby accomplish the pressure testing process, through setting up auxiliary anchoring portion, the torsion tube, torsion joint, the thrust tube, thrust joint and compression joint, compression joint rotates down the anchor shear pin when just rotating the oil pipe, promote the cone and expand the anchor tile and anchor to contact the sleeve inner wall, still through setting up the deblocking portion that is used for driving the anchor tile and break down, this device can realize that a tubular column accomplishes tubular column pressure testing and tubular column anchoring two kinds of technologies, and this device can effectively avoid the tubular column bending eccentric wear phenomenon that conventional anchor pressurization caused, through converting the rotation force into the anchoring force, there is not anchoring unstable phenomenon.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only of the invention and that other drawings can be obtained from them without inventive effort for a person skilled in the art.
Fig. 1 is a schematic view of an anchor structure of an integrated screw pump according to an embodiment of the present invention.
Marked in the figure as:
1. an upper joint; 2. a valve housing; 3. pressure testing valve ball; 4. a ball seat; 5. pressing the cap; 6. a pressure relief seat; 7. a pressure test locking block; 8. pressure test shear pins; 9. a torsion tube; 10. a torsion joint; 11. twisting nails; 12. a thrust tube; 13. an upper load-bearing joint; 14. deblocking the tube; 15. a lower load-bearing joint; 16. a central tube; 17. a thrust joint; 18. releasing the locking piece; 19. compressing the joint; 20. a compression spring; 21. a spring sheath; 22. a cone; 23. anchoring the shear pin; 24. anchor tile; 25. an anchor tile support; 26. unlocking the locking block; 27. a deblocking ring; 28. a locking tube; 29. an auxiliary friction block; 30. auxiliary anchor tiles; 31. a lower joint; 32. a pressure relief hole; 33. a pressure relief cavity.
Detailed Description
The present invention will be further described in detail with reference to specific embodiments in order to make the objects, technical solutions and advantages of the present invention more apparent.
It is to be noted that unless otherwise defined, technical or scientific terms used herein should be taken in a general sense as understood by one of ordinary skill in the art to which the present invention belongs. The terms "first," "second," and the like, as used herein, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.
As shown in fig. 1, this embodiment of the present disclosure provides a pressure test anchoring integrated screw pump anchor, including valve housing 2, upper joint 1, lower joint 31 and center tube 16, wherein center tube 16 lower part is connected with lower joint 31 through locking tube 28, upper joint 1 suit is in the upper portion of valve housing 2, valve housing 2 includes sealed section and pressure release chamber 33, valve housing 2 inboard is equipped with the ball seat 4 that can slide relatively, spacing through pressure test shear pin 8 between valve housing 2 and the ball seat 4, the seat has pressure test valve ball 3 on the ball seat 4, be provided with the limiting plate that spacing is carried out to ball seat 4 downstream distance below ball seat 4, ball seat 4 upper portion is provided with and is used for realizing sealed sealing washer with valve housing 2, and be used for with pressure release hole 32 of pressure release chamber 33 intercommunication, the lower part of valve housing 2 is connected with pressure release seat 6, lock through pressure test locking piece 7 between pressure test locking piece 7 one end and ball seat 4 contact and can be released after ball seat 4 moves to the appointed position.
The bottom of the pressure release seat 6 is connected with a torsion tube 9, the outer diameter of the torsion tube 9 is connected with a torsion joint 10 through a key groove structure, the lower part of the torsion joint 10 is connected with a thrust tube 12, the lower part of the thrust tube 12 is connected with a compression joint 19 through a thrust joint 17, the compression joint 19 is in threaded connection with a central tube 16, the outer side of the lower part of the central tube 16 is provided with a cone 22, the cone 22 is limited on the central tube 16 through an anchoring shear pin 23, an anchor tile 24 is arranged below the cone 22, the anchor tile 24 is seated on an anchor tile support 25, the anchor tile support 25 is locked on the central tube 16 through an anchor unlocking locking block 26, and the lower part of the central tube 16 is also provided with an auxiliary anchoring part for fixing the anchor tile support.
The inner side of the torsion tube 9 is connected with a deblocking part for driving the anchor shoe 24 to be deblocked.
According to the pressure testing anchoring integrated screw pump anchor provided by the embodiment of the specification, through the arrangement of the pressure testing valve ball 3, the ball seat 4, the pressure testing shear pin 8, the pressure testing locking block 7 and the pressure releasing seat 6, when the pump truck oil pipe is being pumped, the pressure testing valve ball 3 pushes the ball seat 4 downwards and cuts off the pressure testing shear pin 8, meanwhile, the pressure testing locking block 7 is released, the valve cover 2 and the pressure releasing seat 6 are relatively displaced, when the rotary pipe column set is set, the valve cover 2 upwards drives the sealing at the outer end of the ball seat 4 to fail, the oil jacket is completed, thereby completing the pressure testing process, the compression joint 19 rotates downwards to cut off the anchoring shear pin 23 through the arrangement of the auxiliary anchoring part, the torsion pipe 9, the torsion joint 10, the thrust pipe 12, the thrust joint 17 and the compression joint 19 during forward rotation of the oil pipe, and pushes the cone 22 downwards to expand the anchor tile 24 to be anchored to the inner wall of the contact sleeve, and the sealing part for anchoring is further through the arrangement of the sealing releasing part for driving the anchor tile 24 to release the anchoring, the two processes can be completed, and the phenomenon that the pipe column is bent and the conventional anchoring and anchoring is effectively avoided, and the phenomenon that the pipe column is not anchored due to the phenomenon of stable pipe column rotation and the pipe column is not caused.
The specific pressure test process is as follows:
the pump truck oil pipe is being pressed, when pressure reaches a certain value, the pressure testing valve ball 3 pushes the ball seat 4 to descend, the pressure testing shear pin 8 is sheared, and the pressure testing shear pin continues to descend to the limiting plate, meanwhile, the pressure testing locking block 7 is released, the valve housing 2 and the pressure relief seat 6 can relatively displace, the sealing ring is still released from the valve housing 2 at the moment and is in a sealing state, then the valve housing 2 ascends when the rotary pipe column group is seated, the sealing ring leaves the sealing section of the valve housing 2, the pressure relief cavity 33 is reached, the sealing failure of the outer end of the ball seat 4 is caused, the pressure relief hole 32 is communicated with the pressure relief cavity 33, the oil jacket communication is completed, the rotor is conveniently lowered in place, and the whole pressure testing process is completed.
As an implementation mode, the external diameter of the lower part of the ball seat 4 is larger than that of the upper part, when the lower part is positioned at the pressure test locking piece 7, the ball seat is contacted with the pressure test locking piece 7, when the upper part is positioned at the pressure test locking piece 7, the pressure test locking piece 7 is released, the pressure test locking piece 7 passes through a pressure test locking hole formed in the valve cover 2 and is inserted into a groove corresponding to the pressure relief seat 6, when the pressure test locking piece 7 is released, the pressure test locking piece 7 is separated from the groove, the valve cover 2 and the pressure relief seat 6 can relatively displace, a controllable structure is formed by arranging the pressure test locking piece 7, misoperation is effectively prevented, and pressure relief in advance is avoided.
As an embodiment, the deblocking part comprises an upper bearing joint 13 and a lower bearing joint 15 connected to the inner side of the torsion tube 9, the upper bearing joint 13 is connected with a deblocking tube 14, the deblocking tube 14 is locked with the central tube 16 through a release locking piece 18, the lower part of the deblocking tube 14 is connected with a deblocking ring 27, and the deblocking ring 27 is movably arranged on one side of the deblocking locking piece 26;
the lower portion of the push tube 12 has a smaller inner diameter than the upper portion, so that the lower portion is released from the release lock 18 when it is positioned therein, and the upper portion is released from the release lock 18 when it is positioned therein.
A compression spring 20 is arranged between the compression joint 19 and the cone 22, the compression spring 20 is used for setting the distance between the compression joint 19 and the cone 22, when the compression joint 19 is in contact with the cone 22, the upper part of the thrust tube 12 moves to the release locking piece 18, so that the release locking piece 18 has release stability, the tool is prevented from being unable to be unsealed due to failure of the release locking piece 18, and a spring sheath 21 is further arranged on the periphery of the compression spring 20.
The concrete setting process is as follows:
during forward rotation of the oil pipe, the auxiliary anchoring part is anchored on the inner wall of the sleeve, so that the central pipe 16 is in a static state, the pipe column continues to rotate, the joint 1 drives the valve cover 2 from top to bottom, the valve cover 2 drives the pressure relief seat 6, the torsion pipe 9, the torsion joint 10, the thrust pipe 12 and the thrust joint 17, the thrust joint 17 drives the compression joint 19 to rotate, the compression joint 19 is in threaded connection with the central pipe 16, the central pipe 16 remains static, the compression joint 19 rotates the descending compression spring 20 along the central pipe 16, the anchoring shear pin 23 is sheared in the compression process, the cone 22 starts to descend at the moment, the anchor shoe support 25 is locked on the central pipe 16 through the anchor shoe unlocking locking piece 26, the cone 22 simultaneously expands the anchor shoe 24 to contact the inner wall of the sleeve, the pipe column continues to rotate until the compression joint 19 contacts the spring sheath 21, the release locking piece 18 is released, and the pipe column continues to rotate the anchor shoe 24 to finish setting.
By converting the rotation force into the anchoring force, the phenomenon of anchoring instability does not exist, and the phenomenon of pipe column bending eccentric wear caused by conventional anchoring by pressurizing and anchoring can be effectively avoided.
The specific deblocking process is as follows:
the pipe column is lifted up, the upper joint 1 drives the valve cover 2 from top to bottom in sequence, the valve cover 2 drives the pressure relief seat 6, the pressure relief seat 6 drives the torsion pipe 9, the torsion pipe 9 drives the lower bearing joint 15, the lower bearing joint 15 drives the upper bearing joint 13, the upper bearing joint 13 drives the deblocking pipe 14, the deblocking pipe 14 drives the deblocking ring 27 to ascend to release the deblocking block, the anchor tile support 25 is not locked by the deblocking block 26 any more, no stress support is needed, when the pipe column continues to ascend, the anchor tile 24 drives the anchor tile support 25 to descend to the upper end of the auxiliary anchoring part, and the cone 22 cannot continue descending under the limitation of the central pipe 16, so that the cone 22 and the anchor tile 24 cannot be in compression contact and expansion any more, and deblocking is completed.
The device has the advantages that the unsealing mode is automatic unsealing of the lifting pipe column, the unsealing mode is simple, and the operation is convenient.
As an embodiment, the auxiliary anchoring part comprises an auxiliary friction block 29 and an auxiliary anchor shoe 30 which are connected to the lower outer side of the central tube 16, wherein the auxiliary friction block 29 is used for immobilizing one end of the auxiliary anchor shoe 30 by virtue of friction with the sleeve, and the other end of the auxiliary anchor shoe is expanded to be anchored to the inner wall of the sleeve, so that the central tube 16 is in a static state.
As an embodiment, the key groove structure includes at least four key grooves provided on the outer diameter of the torsion tube 9 and the torsion nails 11 embedded in the key grooves for transmitting the rotational torque.
As an implementation mode, the pressure relief seat 6 is sleeved with a pressure cap 5, and the position of the pressure relief seat 6 is limited and adjusted.
Those of ordinary skill in the art will appreciate that: the discussion of any of the embodiments above is merely exemplary and is not intended to suggest that the scope of the invention (including the claims) is limited to these examples; the technical features of the above embodiments or in the different embodiments may also be combined within the idea of the invention, the steps may be implemented in any order and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.
The present invention is intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Therefore, any omission, modification, equivalent replacement, improvement, etc. of the present invention should be included in the scope of the present invention.
Claims (7)
1. The utility model provides an anchor of pressure testing anchor integration screw pump, includes valve bonnet (2), upper joint (1), lower clutch and center tube (16), center tube (16) lower part is connected with lower clutch through locking pipe (28), its characterized in that, upper joint (1) suit is in the upper portion of valve bonnet (2), valve bonnet (2) include seal segment and relief cavity (33), valve bonnet (2) inboard is equipped with ball seat (4) that can slide relatively, valve bonnet (2) with spacing through pressure testing shear pin (8) between ball seat (4), seat has pressure testing valve ball (3) on ball seat (4), ball seat (4) below is provided with the limiting plate that carries out spacing to ball seat (4) down distance, ball seat (4) upper portion be provided with be used for with the sealing washer that realizes the seal between valve bonnet (2), and be used for with relief cavity (33) intercommunication relief hole (32), the lower part of valve bonnet (2) is connected with ball seat (6) that can slide relatively, but valve seat (6) and ball seat (4) are locked one end (7) are passed through to pressure testing seat (7) and are released after the valve seat (4) is contacted to pressure testing position (7);
the pressure release seat (6) bottom is connected with torsion pipe (9), torsion pipe (9) external diameter is connected with torsion joint (10) through the keyway structure, torsion joint (10) lower part is connected with thrust pipe (12), thrust pipe (12) lower part is connected with compression joint (19) through thrust joint (17), compression joint (19) threaded connection is on center tube (16), center tube (16) lower part outside is provided with cone (22), and cone (22) are spacing on center tube (16) through anchor shear pin (23), cone (22) below is provided with anchor tile (24), anchor tile (24) are sat on anchor tile support (25), and anchor tile support (25) are locked on center tube (16) through unblanking locking piece (26), center tube (16) lower part still is provided with the auxiliary anchoring portion that is used for fixing it;
the inner side of the torsion tube (9) is connected with a deblocking part for driving the anchor tile (24) to be deblocked;
the deblocking part comprises an upper bearing joint (13) and a lower bearing joint (15) which are connected to the inner side of the torsion tube (9), the upper bearing joint (13) is connected with a deblocking tube (14), the deblocking tube (14) is locked with the central tube (16) through a release locking block (18), the lower part of the deblocking tube (14) is connected with a deblocking ring (27), and the deblocking ring (27) is movably arranged on one side of the deblocking locking block (26);
the inner diameter of the lower part of the thrust tube (12) is smaller than that of the upper part, so that the lower part is released from the release locking piece (18) when the lower part is positioned at the release locking piece (18), and the upper part releases the release locking piece (18) when the upper part is positioned at the release locking piece.
2. The pressure test anchoring integrated screw pump anchor according to claim 1, characterized in that a compression spring (20) is arranged between the compression joint (19) and the cone (22), the compression spring (20) is used for setting the distance between the compression joint (19) and the cone (22) so that when the compression joint (19) is in contact with the cone (22), the upper part of the thrust tube (12) moves to the release locking block (18).
3. The pressure test anchoring integrated screw pump anchor according to claim 2, wherein a spring sheath (21) is provided on the circumferential side of the compression spring (20).
4. The pressure test anchoring integrated screw pump anchor according to claim 1, wherein the auxiliary anchoring portion comprises an auxiliary friction block (29) and an auxiliary anchor shoe (30) which are connected to the outer side of the lower portion of the central tube (16), and the auxiliary friction block (29) is used for enabling one end of the auxiliary anchor shoe (30) to be fixed and the other end to expand when being rubbed.
5. The pressure test anchoring integrated screw pump anchor according to claim 1, characterized in that the key slot structure comprises at least four key slots provided on the outer diameter of the torsion tube (9) and torsion nails (11) embedded in the key slots.
6. The pressure test anchoring integrated screw pump anchor according to claim 1, wherein the ball seat (4) has a lower outer diameter larger than an upper outer diameter, so that the lower portion is in contact with the pressure test locking piece (7) when being positioned at the pressure test locking piece (7), and the upper portion releases the pressure test locking piece (7) when being positioned at the pressure test locking piece (7).
7. The pressure test anchoring integrated screw pump anchor according to claim 1, wherein the pressure relief seat (6) is sleeved with a pressure cap (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310218322.2A CN115929234B (en) | 2023-03-09 | 2023-03-09 | Pressure testing anchoring integrated screw pump anchor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310218322.2A CN115929234B (en) | 2023-03-09 | 2023-03-09 | Pressure testing anchoring integrated screw pump anchor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115929234A CN115929234A (en) | 2023-04-07 |
| CN115929234B true CN115929234B (en) | 2023-05-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202310218322.2A Active CN115929234B (en) | 2023-03-09 | 2023-03-09 | Pressure testing anchoring integrated screw pump anchor |
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Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101165309B (en) * | 2006-10-18 | 2011-08-10 | 刘宜贵 | Compression type packer |
| CN201650176U (en) * | 2010-04-29 | 2010-11-24 | 张召泉 | Rotary sitting type screw pump anchor |
| AT519580B1 (en) * | 2017-06-26 | 2018-08-15 | Jansen Ag | pressure gauge |
| CN209067139U (en) * | 2018-12-01 | 2019-07-05 | 东营市博辉工贸有限公司 | Set reliable tubing anchor |
| CN113417595B (en) * | 2021-07-13 | 2023-04-18 | 中国石油化工股份有限公司 | Anchoring packer and using method thereof |
| CN113294105B (en) * | 2021-07-22 | 2021-10-01 | 东营市海天石油科技有限责任公司 | Rotary screw pump anchor |
| CN113738305B (en) * | 2021-11-03 | 2022-01-18 | 东营市海天石油科技有限责任公司 | Rotary pressure relief controllable pressure testing valve |
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2023
- 2023-03-09 CN CN202310218322.2A patent/CN115929234B/en active Active
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| CN115929234A (en) | 2023-04-07 |
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