CN117888832B - Underground tool connection special coupling with special threads - Google Patents
Underground tool connection special coupling with special threads Download PDFInfo
- Publication number
- CN117888832B CN117888832B CN202410268559.6A CN202410268559A CN117888832B CN 117888832 B CN117888832 B CN 117888832B CN 202410268559 A CN202410268559 A CN 202410268559A CN 117888832 B CN117888832 B CN 117888832B
- Authority
- CN
- China
- Prior art keywords
- connecting hole
- blind hole
- special
- hole
- base body
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000008878 coupling Effects 0.000 title claims abstract description 42
- 238000010168 coupling process Methods 0.000 title claims abstract description 42
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 42
- 239000007788 liquid Substances 0.000 claims description 17
- 238000007789 sealing Methods 0.000 claims description 16
- 230000000903 blocking effect Effects 0.000 claims description 4
- 238000011010 flushing procedure Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 5
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
Landscapes
- Earth Drilling (AREA)
Abstract
The invention discloses a special coupling for connecting an underground tool with special threads, which relates to the technical field of the underground tool of an oil field.
Description
Technical Field
The invention belongs to the technical field of downhole tools in oil fields, and particularly relates to a special coupling for connecting a downhole tool with special threads.
Background
In the petroleum exploitation process, a type of underground tool which needs high pressure for setting when in use such as a packer and a bridge plug is needed, and the pressure ratio which needs to be born by a coupling joint in an oil pipe column is large because the setting pressure is high, so that the coupling joint in the pipe column in the prior art is basically connected by using special threads in order to avoid leakage, so that the tightness and the bearing capacity of the connection are improved. The injected high pressure is supplied by a ground high pressure pump, and at the moment of switching between pressing and stopping, the condition that the underground pressure instantaneously returns exists, the upper reaction force has extremely strong damage to the high pressure pump, and the potential safety hazard is also formed for the underground operators.
Disclosure of Invention
In order to solve the problem of pressure upward in the underground at the moment of stopping pressure, the invention provides a special coupling body for connecting an underground tool with special threads.
The technical scheme provided by the invention is as follows: the underground tool connection special coupling with special threads comprises a coupling body, wherein the inside of two ends of the coupling body is respectively provided with the special threads so as to improve the tightness and the bearing capacity of connection; the coupling body is internally provided with a high-pressure releaser which comprises a cylindrical substrate, the lower end surface of the substrate is provided with an axial blind hole I, the middle upper part of the blind hole I is provided with an upper ball seat, the lower part of the blind hole I is inserted with a cylindrical plug body, the upper end surface of the plug body is provided with an axial blind hole II, the upper end surface of the blind hole II is provided with a lower ball seat, a weight ball is arranged between the upper ball seat and the lower ball seat, and the weight ball can move between the upper ball seat and the lower ball seat; the upper end face of the base body is provided with an axial blind hole III, the base body is also provided with a connecting hole I for communicating the blind hole III with the blind hole I, the plug body is provided with a connecting hole II, the connecting hole II communicates the connecting hole I with the blind hole II, the connecting hole II is positioned below the lower ball seat, the lower end face of the base body is provided with an axial blind hole IV, the base body is also provided with a connecting hole III for communicating the blind hole IV with the blind hole I, the connecting hole III is positioned between the upper ball seat and the lower ball seat, the side wall of the coupling body is provided with a liquid outlet hole, the base body is also provided with a connecting hole IV for communicating the blind hole I with the liquid outlet hole, and the connecting hole IV is positioned above the upper ball seat; the upper end face of the base body is provided with a blind hole five, the base body is also provided with a connecting hole five used for communicating the blind hole five with the blind hole one, the connecting hole five is positioned above the connecting hole four, the upper part of the blind hole one is provided with a telescopic damper, the damper is in sliding sealing fit with the blind hole one, the connecting hole five is blocked by the damper in an extending state, and the blocking of the connecting hole five by the damper in a contracted state is relieved.
The further technical scheme is as follows: the outer wall of the plug body corresponding to the second connecting hole is provided with a concave ring I; and a concave ring II is processed on the outer wall of the matrix corresponding to the connecting hole IV.
The further technical scheme is as follows: limiting rings are respectively arranged on two sides of the base body, and are respectively in threaded connection with the coupling body.
The further technical scheme is as follows: the fourth connecting hole is provided with an expanding section at one end close to the liquid outlet hole, a flashboard is hinged in the expanding section and hinged on the base body through a hinge shaft, a torsion spring is arranged on the hinge shaft, and the flashboard has a movement trend of covering the fourth connecting hole under the action of the torsion spring.
The further technical scheme is as follows: the limiting ring is provided with a sealing groove on the end face far away from the base body, the upper part of the coupling body is connected with the oil pipe through special threads, the lower part of the coupling body is connected with the downhole tool through special threads, the end faces of the oil pipe and the downhole tool are abutted against the sealing groove, the limiting ring is connected with the coupling body through left-handed threads, and the special threads are right-handed threads.
Compared with the prior art, the invention has the beneficial effects that:
1. The invention is connected above a type of underground tool which needs high pressure for setting, and can release the upward high pressure through the high pressure releaser at the moment of stopping injecting the high pressure, thereby reducing the damage of the upward high pressure to the underground equipment.
2. The invention is arranged above a type of underground tool which needs high pressure for setting, can be injected forward, and does not influence the smooth operation of back flushing.
3. The sealing groove on the end face of the limiting ring can play a role in reinforcing sealing on an oil pipe and an underground tool connected to the coupling body, and the bearing capacity of the connecting part is improved. In addition, the limiting ring is connected with the coupling body through left-handed threads, the special threads are right-handed threads, and in the screwing process of the oil pipe and the coupling body, the rotation of the oil pipe drives the rotation of the limiting ring through static friction, so that the sealing surface between the oil pipe and the limiting ring is tighter, and the sealing effect is better.
Drawings
Fig. 1 is a cross-sectional view of the present invention.
In the figure: 1. sealing the groove; 2. a limiting ring; 3. a base; 4. a blind hole V; 5. a fifth connecting hole; 6. a damper; 7. a liquid outlet hole; 8. a flashboard; 9. a fourth connecting hole; 10. a third connecting hole; 11. a blind hole IV; 12. a plug body; 13. a second blind hole; 14. a second connecting hole; 15. a first connecting hole; 16. a third blind hole; 17. setting down the ball seat; 18. a weight ball; 19. a blind hole I; 20. and (5) ball seating.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The embodiment comprises a coupling body, wherein the coupling body is connected above a type of downhole tool needing high-pressure setting, and the type of downhole tool needing high-pressure setting is arranged in an oil pipe column, so that all couplings with special threads are selected for the coupling used in the oil pipe column to improve the overall bearing capacity of the pipe column.
The coupling body is internally provided with the high-pressure releaser, when the moment of stopping injecting high pressure, if the condition that the high pressure instantaneously returns exists, the high-pressure releaser can release the upward-returning high pressure into the oil sleeve annulus from the oil pipe string so as to reduce the damage to ground equipment and personnel.
As shown in fig. 1, the high-pressure releaser comprises a cylindrical base body 3, wherein the base body 3 is in sealing fit with a coupling body, an axial blind hole I19 is formed in the lower end surface of the base body 3, an upper ball seat 20 is formed in the middle upper part of the blind hole I19, a cylindrical plug body 12 is inserted into the lower part of the blind hole I19, an axial blind hole II 13 is formed in the upper end surface of the plug body 12, a lower ball seat 17 is formed in the upper end surface of the blind hole II 13, a weight ball 18 is arranged between the upper ball seat 20 and the lower ball seat 17, and the weight ball 18 can move between the upper ball seat 20 and the lower ball seat 17; the upper end face of the base body 3 is provided with an axial blind hole III 16, the base body 3 is also provided with a first connecting hole 15 for communicating the blind hole III 16 with a first blind hole 19, the plug body 12 is provided with a second connecting hole 14, the second connecting hole 14 communicates the first connecting hole 15 with the second blind hole 13, the second connecting hole 14 is positioned below the lower ball seat 17, the lower end face of the base body 3 is provided with a fourth axial blind hole 11, the base body 3 is also provided with a third connecting hole 10 for communicating the fourth blind hole 11 with the first blind hole 19, the third connecting hole 10 is positioned between the upper ball seat 20 and the lower ball seat 17, the side wall of the coupling body is provided with a liquid outlet 7, the base body 3 is also provided with a fourth connecting hole 9 for communicating the first blind hole 19 with the liquid outlet 7, and the fourth connecting hole 9 is positioned above the upper ball seat 20; the upper end face of the base body 3 is provided with a blind hole five 4, the base body 3 is also provided with a connecting hole five 5 used for communicating the blind hole five 4 with a blind hole one 19, the connecting hole five 5 is located above the connecting hole four 9, the upper portion of the blind hole one 19 is provided with a telescopic damper 6, the damper 6 is in sliding fit with the blind hole one 19, the connecting hole five 5 is blocked by the damper 6 in an extending state, and the blocking of the connecting hole five 5 by the damper 6 in a contracting state is relieved.
The high-pressure injection process of this embodiment is: the high pressure is injected into the underground tool requiring high pressure setting through the oil pipe, and because the embodiment is positioned above the underground tool requiring high pressure setting, liquid sequentially enters the blind hole II 13 through the blind hole III 16, the connecting hole I15 and the connecting hole II 14, the weight ball 18 is jacked from the lower ball seat 17 under the action of the high pressure, the weight ball 18 moves upwards and is sealed on the upper ball seat 20, the upper part of the blind hole I19 is blocked, the liquid enters the blind hole IV 11 through the connecting hole III 10, and further enters the center of the underground tool requiring high pressure setting downwards.
The operation process of the embodiment at the moment of high-voltage injection stopping is as follows: at the moment of stopping injection under high pressure, the weight ball 18 falls to the upper end of the lower ball seat 17 under the action of gravity, the space below the blind hole II 13 is blocked, the hydraulic pressure returned from the downhole tool enters the connecting hole III 10 through the blind hole IV 11, and then the oil jacket annulus is released from the connecting hole IV 9, the flashboard 8 and the liquid outlet hole 7, so that the damage to the wellhead device caused by the high-pressure return is avoided. When the hydraulic pressure is released, the hydraulic pressure also acts on the damper 6, the damper 6 is compressed to slide upwards, but the damper 6 needs a certain time to slide upwards, so the blocking of the damper 6 to the connecting hole five 5 is not released at the initial stage of pressure release, after a period of time, the connecting hole five 5 is opened, but the upward pressure is greatly reduced, and the upward pressure cannot cause damage to the well equipment.
This embodiment is useful in back flushing: the back flushing fluid is injected from the oil sleeve annulus, and the hydraulic pressures at the two sides of the flashboard 8 are the same, so that the back flushing fluid cannot be opened. The well-flushing liquid of the back flushing enters from the blind hole IV 11, enters into the blind hole I19 through the connecting hole III 10, and after a period of time, the damper 6 is fully compressed to leak out of the connecting hole V5, so that an uplink channel of the well-flushing liquid is formed, and the normal operation of the back flushing operation is not influenced in the embodiment.
The outer wall of the plug body 12 corresponding to the second connecting hole 14 is provided with a first concave ring; and a concave ring II is processed on the outer wall of the base body 3 corresponding to the fourth connecting hole 9.
In order to limit the sliding of the high-pressure releaser, limiting rings 2 are respectively arranged on two sides of the base body 3, the limiting rings 2 are abutted against the end face of the base body 3, and the limiting rings 2 are respectively in threaded connection with the coupling body. The end face of the limiting ring 2 far away from the base body 3 is provided with a sealing groove 1, the end faces of the oil pipe and the downhole tool are abutted in the sealing groove 1, the limiting ring 2 is connected with the coupling body through left-handed threads, and the special threads are right-handed threads. In the screwing process of the oil pipe and the coupling body, the rotation of the oil pipe drives the rotation of the limiting ring 2 through static friction, so that the sealing surface between the oil pipe and the limiting ring 2 is tighter, and the sealing effect is better.
The connecting hole IV 9 is provided with an expanding section at one end close to the liquid outlet 7, the expanding section is internally hinged with a flashboard 8, the flashboard 8 is hinged on the base body 3 through a hinge shaft, a torsion spring is arranged on the hinge shaft, the flashboard 8 has a movement trend of covering the connecting hole IV 9 under the action of the torsion spring, the flashboard 8 plays a role of unidirectional current limiting, only liquid is allowed to flow out of the connecting hole IV 9, and liquid is not allowed to enter from the connecting hole IV 9.
Claims (5)
1. The utility model provides a special coupling of tool connection in pit with special screw thread, includes the coupling body, and the inside at the both ends of coupling body is processed respectively has special screw thread to promote the leakproofness and the bearing capacity of connection, make leakproofness and bearing capacity satisfy the setting pressure demand of high pressure setting class tool in pit, its characterized in that: the coupling body is internally provided with a high-pressure releaser, the high-pressure releaser comprises a cylindrical base body (3), an axial blind hole I (19) is formed in the lower end face of the base body (3), an upper ball seat (20) is formed in the middle upper portion of the blind hole I (19), a cylindrical plug body (12) is inserted into the lower portion of the blind hole I (19), an axial blind hole II (13) is formed in the upper end face of the plug body (12), a lower ball seat (17) is formed in the upper end face of the blind hole II (13), a weight ball (18) is arranged between the upper ball seat (20) and the lower ball seat (17), and the weight ball (18) can move between the upper ball seat (20) and the lower ball seat (17); an axial blind hole III (16) is formed in the upper end face of the base body (3), a connecting hole I (15) for communicating the blind hole III (16) with a blind hole I (19) is further formed in the base body (3), a connecting hole II (14) is formed in the plug body (12), the connecting hole II (14) is used for communicating the connecting hole I (15) with the blind hole II (13), the connecting hole II (14) is located below a lower ball seat (17), an axial blind hole IV (11) is formed in the lower end face of the base body (3), a connecting hole III (10) for communicating the blind hole IV (11) with the blind hole I (19) is further formed in the base body (3), the connecting hole III (10) is located between an upper ball seat (20) and a lower ball seat (17), a liquid outlet hole (7) is formed in the side wall of the coupling body, and the base body (3) is further provided with a connecting hole IV (9) for communicating the blind hole I (19) with the liquid outlet hole I (7), and the connecting hole IV (9) is located above the upper ball seat (20). The novel plastic base is characterized in that a blind hole five (4) is formed in the upper end face of the base body (3), a connecting hole five (5) used for communicating the blind hole five (4) with a blind hole one (19) is further formed in the base body (3), the connecting hole five (5) is located above the connecting hole four (9), a telescopic damper (6) is arranged on the upper portion of the blind hole one (19), the damper (6) is in sliding sealing fit with the blind hole one (19), the connecting hole five (5) is blocked by the damper (6) in an extending state, and blocking of the connecting hole five (5) by the damper (6) in a contracting state is relieved.
2. A special coupling for downhole tool connection with special threads according to claim 1, wherein: the outer wall of the plug body (12) corresponding to the second connecting hole (14) is provided with a first concave ring; and a concave ring II is processed on the outer wall of the base body (3) corresponding to the fourth connecting hole (9).
3. A special coupling for downhole tool connection with special threads according to claim 1, wherein: limiting rings (2) are respectively arranged on two sides of the base body (3), and the limiting rings (2) are respectively in threaded connection with the coupling body.
4. A special coupling for downhole tool connection with special threads according to claim 3, wherein: the limiting ring (2) is provided with a sealing groove (1) on the end face far away from the base body (3), the upper part of the coupling body is connected with an oil pipe through special threads, the lower part of the coupling body is connected with an underground tool through special threads, the end faces of the oil pipe and the underground tool are abutted against the inside of the sealing groove (1), the limiting ring (2) is connected with the coupling body through left-handed threads, and the special threads are right-handed threads.
5. A special coupling for downhole tool connection with special threads according to claim 1, wherein: the fourth connecting hole (9) is provided with a diameter-expanding section at one end close to the liquid outlet hole (7), a flashboard (8) is hinged in the diameter-expanding section, the flashboard (8) is hinged on the base body (3) through a hinge shaft, a torsion spring is arranged on the hinge shaft, and the flashboard (8) has a movement trend of covering the fourth connecting hole (9) under the action of the torsion spring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410268559.6A CN117888832B (en) | 2024-03-11 | 2024-03-11 | Underground tool connection special coupling with special threads |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410268559.6A CN117888832B (en) | 2024-03-11 | 2024-03-11 | Underground tool connection special coupling with special threads |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN117888832A CN117888832A (en) | 2024-04-16 |
| CN117888832B true CN117888832B (en) | 2024-05-24 |
Family
ID=90651557
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410268559.6A Active CN117888832B (en) | 2024-03-11 | 2024-03-11 | Underground tool connection special coupling with special threads |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117888832B (en) |
Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4872510A (en) * | 1988-09-30 | 1989-10-10 | Baker Hughes Incorporated | Subterranean well casing float tool |
| US5413180A (en) * | 1991-08-12 | 1995-05-09 | Halliburton Company | One trip backwash/sand control system with extendable washpipe isolation |
| US5971072A (en) * | 1997-09-22 | 1999-10-26 | Schlumberger Technology Corporation | Inductive coupler activated completion system |
| US6155350A (en) * | 1999-05-03 | 2000-12-05 | Baker Hughes Incorporated | Ball seat with controlled releasing pressure and method setting a downhole tool ball seat with controlled releasing pressure and method setting a downholed tool |
| US6318470B1 (en) * | 2000-02-15 | 2001-11-20 | Halliburton Energy Services, Inc. | Recirculatable ball-drop release device for lateral oilwell drilling applications |
| CN201521286U (en) * | 2009-09-28 | 2010-07-07 | 大庆油田有限责任公司 | Anti-dredging resistance-accounting concentric switch of water injection well |
| CN201574733U (en) * | 2009-12-26 | 2010-09-08 | 赵贵刚 | Underground multifunctional extrusion-washing-discharge device |
| RU2425946C1 (en) * | 2010-03-09 | 2011-08-10 | Открытое акционерное общество "Татнефть" имени В.Д. Шашина | Bore-hole disconnector |
| CN201924870U (en) * | 2010-11-08 | 2011-08-10 | 西安鼎和新型能源有限公司 | Hydraulic setting tool |
| CN102400661A (en) * | 2011-11-25 | 2012-04-04 | 中国石油天然气股份有限公司 | Balance valve for multi-layer fracturing operation of continuous oil pipe |
| CN208578521U (en) * | 2018-05-29 | 2019-03-05 | 中国石油天然气股份有限公司 | Conical seal-testing pressure-relief joint |
| CN209469414U (en) * | 2019-01-15 | 2019-10-08 | 西安山川石油科技有限责任公司 | A kind of draining over-voltage regular valve device |
| CN110513054A (en) * | 2019-09-21 | 2019-11-29 | 东北石油大学 | A kind of underground damper |
| CN214532897U (en) * | 2021-03-05 | 2021-10-29 | 大庆市亚盛油田技术开发有限公司 | Hydraulic setting anchoring drillable bridge plug tool |
| CN218347342U (en) * | 2022-09-02 | 2023-01-20 | 山东东远石油装备有限公司 | High-wear-resistance ball type universal joint assembly of screw drilling tool |
| CN115992660A (en) * | 2021-10-19 | 2023-04-21 | 中国石油天然气集团有限公司 | Repeatedly opened and closed reverse circulation valve |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6959766B2 (en) * | 2003-08-22 | 2005-11-01 | Halliburton Energy Services, Inc. | Downhole ball drop tool |
| GB0706350D0 (en) * | 2007-03-31 | 2007-05-09 | Specialised Petroleum Serv Ltd | Ball seat assembly and method of controlling fluid flow through a hollow body |
| US10294752B2 (en) * | 2015-08-26 | 2019-05-21 | Geodynamics, Inc. | Reverse flow catch-and-release tool and method |
-
2024
- 2024-03-11 CN CN202410268559.6A patent/CN117888832B/en active Active
Patent Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4872510A (en) * | 1988-09-30 | 1989-10-10 | Baker Hughes Incorporated | Subterranean well casing float tool |
| US5413180A (en) * | 1991-08-12 | 1995-05-09 | Halliburton Company | One trip backwash/sand control system with extendable washpipe isolation |
| US5971072A (en) * | 1997-09-22 | 1999-10-26 | Schlumberger Technology Corporation | Inductive coupler activated completion system |
| US6155350A (en) * | 1999-05-03 | 2000-12-05 | Baker Hughes Incorporated | Ball seat with controlled releasing pressure and method setting a downhole tool ball seat with controlled releasing pressure and method setting a downholed tool |
| US6318470B1 (en) * | 2000-02-15 | 2001-11-20 | Halliburton Energy Services, Inc. | Recirculatable ball-drop release device for lateral oilwell drilling applications |
| CN201521286U (en) * | 2009-09-28 | 2010-07-07 | 大庆油田有限责任公司 | Anti-dredging resistance-accounting concentric switch of water injection well |
| CN201574733U (en) * | 2009-12-26 | 2010-09-08 | 赵贵刚 | Underground multifunctional extrusion-washing-discharge device |
| RU2425946C1 (en) * | 2010-03-09 | 2011-08-10 | Открытое акционерное общество "Татнефть" имени В.Д. Шашина | Bore-hole disconnector |
| CN201924870U (en) * | 2010-11-08 | 2011-08-10 | 西安鼎和新型能源有限公司 | Hydraulic setting tool |
| CN102400661A (en) * | 2011-11-25 | 2012-04-04 | 中国石油天然气股份有限公司 | Balance valve for multi-layer fracturing operation of continuous oil pipe |
| CN208578521U (en) * | 2018-05-29 | 2019-03-05 | 中国石油天然气股份有限公司 | Conical seal-testing pressure-relief joint |
| CN209469414U (en) * | 2019-01-15 | 2019-10-08 | 西安山川石油科技有限责任公司 | A kind of draining over-voltage regular valve device |
| CN110513054A (en) * | 2019-09-21 | 2019-11-29 | 东北石油大学 | A kind of underground damper |
| CN214532897U (en) * | 2021-03-05 | 2021-10-29 | 大庆市亚盛油田技术开发有限公司 | Hydraulic setting anchoring drillable bridge plug tool |
| CN115992660A (en) * | 2021-10-19 | 2023-04-21 | 中国石油天然气集团有限公司 | Repeatedly opened and closed reverse circulation valve |
| CN218347342U (en) * | 2022-09-02 | 2023-01-20 | 山东东远石油装备有限公司 | High-wear-resistance ball type universal joint assembly of screw drilling tool |
Non-Patent Citations (3)
| Title |
|---|
| 一种井下双向防喷球座的研制;韩文超;王光建;赵洪瑞;;化学工程与装备;20161015(第10期);全文 * |
| 井下压差式常通阀;李志广;李川;张子佳;黄大云;腾福井;徐德新;;石油矿场机械;20091025(第10期);全文 * |
| 水平井用液压封隔器坐封工艺技术研究;李啸南, 逯国成, 黄侠, 范海涛, 曹钧合;石油机械;20040810(第08期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN117888832A (en) | 2024-04-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4811758A (en) | Pressurized check valve | |
| CN107701147B (en) | Annulus pressure underground control valve | |
| CN202165065U (en) | Pipe column blanking plug | |
| CN201074502Y (en) | Dual-valve plate type subsurface safety valve | |
| CN101975042B (en) | Fully functional anti-spouting oil drain device | |
| CN113586003B (en) | Linkage setting and diverting leakage finding tool | |
| CN117888832B (en) | Underground tool connection special coupling with special threads | |
| CN116335579B (en) | Oil field well casing packer and non-cementing injection self-plugging staged fracturing method | |
| CN108999589B (en) | Downhole blowout preventer for workover operation | |
| CN109798085B (en) | Normally closed type one-way injection downhole blowout preventer | |
| CN218563627U (en) | Double-core annular blowout preventer capable of sealing accompanying cable or hydraulic control pipe column | |
| CN217925808U (en) | Horizontal well sectional profile control tubular column system | |
| CN111894559B (en) | Inner channel decompression restrictor | |
| CN114687702B (en) | Ultra-long cement plug well abandoning releasing tool | |
| CN201851082U (en) | Fully-functional anti-spray oil drain device | |
| CN201851083U (en) | Two-way blowout-preventing oil drain device | |
| CN114439417B (en) | Hydraulic control rubber cylinder type bidirectional well flushing valve and method | |
| CN109779547B (en) | Downhole liquid flow reversing tool | |
| CN2282058Y (en) | Hydraulic back-off sub | |
| CN111636851A (en) | Shaft float switch and method for controlling shaft switch | |
| CN114482922B (en) | Annular space safety control device for multitube production tubular column and method for using annular space safety control device | |
| CN220769419U (en) | Double-oil pipe cement plug pipe column for leakage well | |
| CN211201952U (en) | Flow controller and leakage finding pipe column | |
| CN113090219B (en) | Downhole blowout preventer | |
| CN117231180B (en) | Sand blasting perforation device and ultra-short radius horizontal well completion method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |