CN108868692B - Casing additional cavity pressure relief device for deepwater annulus trapping pressure treatment - Google Patents
Casing additional cavity pressure relief device for deepwater annulus trapping pressure treatment Download PDFInfo
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- CN108868692B CN108868692B CN201810627562.7A CN201810627562A CN108868692B CN 108868692 B CN108868692 B CN 108868692B CN 201810627562 A CN201810627562 A CN 201810627562A CN 108868692 B CN108868692 B CN 108868692B
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- injection valve
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- 239000007789 gas Substances 0.000 claims abstract description 89
- 238000002347 injection Methods 0.000 claims abstract description 81
- 239000007924 injection Substances 0.000 claims abstract description 81
- 239000011261 inert gas Substances 0.000 claims abstract description 22
- 229920001971 elastomer Polymers 0.000 claims abstract description 19
- 239000000806 elastomer Substances 0.000 claims abstract description 19
- 239000012530 fluid Substances 0.000 claims description 22
- 238000004519 manufacturing process Methods 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 14
- 230000000903 blocking effect Effects 0.000 claims description 13
- 238000012360 testing method Methods 0.000 claims description 7
- 238000012546 transfer Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000011084 recovery Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 238000005553 drilling Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Classifications
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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
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/08—Valve arrangements for boreholes or wells in wells responsive to flow or pressure of the fluid obtained
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Safety Valves (AREA)
Abstract
The invention relates to a sleeve additional cavity pressure relief device for deepwater annular confinement pressure treatment, which comprises an annular additional cavity, a safety protection sheet, an upper cavity, a lower cavity, an elastomer, a movable clamping groove, a movable track and a gas injection valve, wherein the annular additional cavity is provided with a plurality of grooves; the annular additional chamber is arranged on the sleeve and is arranged along the outer circumference of the sleeve; a safety protection sheet is arranged at the top of the annular additional chamber, and the annular additional chamber is internally divided into an upper chamber and a lower chamber; an upper chamber is arranged below the safety protection plate, a movable elastic body is arranged at the bottom of the upper chamber, and a lower chamber is arranged below the elastic body; the inner side wall of the annular additional chamber and the outer wall of the sleeve are correspondingly provided with moving rails, and the inner side and the outer side of the elastic body are respectively provided with a moving clamping groove matched with the moving rails; and the gas injection valve is arranged at the bottom of the annular additional chamber, and the inert gas is injected into the lower chamber through the gas injection valve. The invention can not only ensure the integrity of the shaft, but also realize the purpose of multiple pressure relief.
Description
Technical Field
The invention relates to a pressure relief device, in particular to a sleeve additional cavity pressure relief device applied to deep water annular confinement pressure treatment in the production process of a deep water oil and gas well.
Background
Offshore oil and gas resources are one of important parts of global oil and gas resources, as the oil and gas resources developed by deepwater drilling are more severe than land exploitation conditions and more complex in technology, wherein the problem of annular confining pressure rise caused by the fact that high-temperature fluid flowing from a well bottom to a well head transfers heat to a closed annular space through a well wall in multiple layers is one of main problems in the production test process of deepwater oil and gas wells. The annulus between the production string and the production casing may be relieved of its liquid expansion volume by an annulus relief valve on the subsea wellhead to which it is connected. For the other annuli, no pressure relief passage exists. At present, the annular confinement pressure treatment measures for other annuluses mainly adopt a rupture disc and compressible foam to release pressure, wherein the rupture disc can only realize one-time pressure release, the integrity of a shaft can be damaged after the rupture disc is opened, and the compressible foam has the engineering problems that the running process is easy to wear and drop and the like.
Disclosure of Invention
Aiming at the problems, the invention aims to provide a casing additional cavity pressure relief device for deepwater annulus trapping pressure treatment, which can balance the annulus trapping pressure through an additional cavity arranged on a casing, thereby not only ensuring the integrity of a shaft, but also realizing the purpose of multiple pressure relief.
In order to achieve the purpose, the invention adopts the following technical scheme: the utility model provides a supplementary cavity pressure relief device of sleeve pipe that is used for deep water annular confinement pressure to administer which characterized in that: the device comprises an annular additional chamber, a safety protection plate, an upper chamber, a lower chamber, an elastic body, a movable clamping groove, a movable track and a gas injection valve; the annular additional chamber is arranged on the sleeve and is arranged along the outer circumference of the sleeve; the safety protection sheet is arranged at the top of the annular additional chamber, and the annular additional chamber is divided into an upper chamber and a lower chamber; the upper chamber is positioned below the safety protection plate, the movable elastic body is arranged at the bottom of the upper chamber, and the lower chamber is positioned below the elastic body; the inner side wall of the annular additional chamber and the outer wall of the sleeve are correspondingly provided with the moving tracks, and the inner side and the outer side of the elastic body are respectively provided with the moving clamping grooves matched with the moving tracks; and the lower cavity is internally provided with the gas injection valve, and inert gas is injected into the lower cavity through the gas injection valve.
Further, the gas injection valve comprises a gas injection valve base, a spring, a gas injection valve hemisphere, a gas injection hole and a gas injection hole cap; the gas injection valve base is arranged on the wall surface of the annular additional cavity, one end of the spring is fixed on the gas injection valve base, and the other end of the spring is connected with the gas injection valve hemisphere; the gas injection hole is formed in the wall surface of the annular additional cavity, and the gas injection valve hemisphere is arranged in the gas injection hole; the gas injection hole cap is in threaded connection with the gas injection hole, the gas injection hole 15 is plugged through the gas injection hole cap, and the gas injection hole cap is welded and fixed on the outer wall surface of the annular additional cavity after plugging the gas injection hole.
Further, the safety protection plate is symmetrically arranged at 180 degrees at the top of the annular additional chamber.
Furthermore, an upper triangular blocking cone is arranged at the upper part of the upper chamber, a lower triangular blocking cone is arranged between the bottom of the upper chamber and the top of the lower chamber, the elastomer is positioned at the lower triangular blocking cone at the initial position, and after inflation, the elastomer is positioned at the upper triangular blocking cone; the sliding range of the elastic body is limited by the upper triangular stop cone and the lower triangular stop cone.
Further, the end of the movable clamping groove is provided with a sealing ring.
Furthermore, the upper end and the lower end of the annular additional cavity are both inclined planes, and the end parts of the inclined planes are welded and fixed with the sleeve.
Furthermore, the annular additional chamber is formed by splicing two semicircular cylindrical cavities.
Furthermore, the ends of the two semi-circular cylinder cavities are connected into a whole through a buckle, and the two semi-circular cylinder cavities are fixed through welding after the buckle is clamped.
Further, in the reproduction test stage of the pressure relief device, the annular confining fluid outside the casing is subjected to heat transfer by high-temperature fluid produced in the production test process in the production string to cause annular confining pressure to rise, when the pressure rises to the rated crushing pressure of the safety protection sheet, the safety protection sheet is crushed by the annular confining fluid to enter the upper chamber, and the annular confining fluid acts on the elastomer to compress the inert gas in the lower chamber in the expansion process to relieve the annular confining pressure; in the well shut-in recovery process, the temperature of the annular confining fluid is reduced, the volume is reduced, and the inert gas in the lower chamber acts on the elastomer to move the elastomer upwards; after the production is continued, the annular trapping fluid is heated and expanded again, and the annular trapping pressure is relieved again by acting on the elastomer to compress the inert gas in the lower chamber; the annular confining pressure is constantly changed under different working conditions, and the annular confining pressure is always kept within the maximum safe allowable pressure value through the compressibility of the inert gas in the lower cavity.
Due to the adoption of the technical scheme, the invention has the following advantages: according to the invention, through compressibility of the inert gas, annular trapping pressure existing in the deepwater oil-gas well development process is effectively relieved, and multiple times of pressure relief of annular trapping can be realized through the elastomer. Meanwhile, the safety protection sheet at the top of the annular additional chamber ensures that the pressure relief device of the sleeve additional chamber is not damaged during well cementation.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a top view of FIG. 1;
fig. 3 is a bottom view of fig. 1.
Detailed Description
In the description of the present invention, it is to be understood that the terms "upper", "lower", "inside", "outside", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. The invention is described in detail below with reference to the figures and examples.
As shown in figure 1, the invention provides a casing additional chamber pressure relief device for deepwater annulus trapping pressure treatment, which is used for preventing the annulus trapping pressure generated in the production process of a deepwater oil-gas well from damaging a shaft casing. The invention comprises an annular additional chamber 1, a safety protection sheet 2, an upper chamber 3, a lower chamber 4, an elastic body 5, a moving track 6, a moving clamping groove 7, an upper triangular block cone 8, a lower triangular block cone 9 and a gas injection valve.
The annular additional chamber 1 is arranged on the sleeve 10, circumferentially along the outside of the sleeve 10. The safety protection sheet 2 for protecting the annular additional chamber 1 from being damaged and installed in the well cementation process is arranged at the top of the annular additional chamber 1, and the safety protection sheets 2 are symmetrically arranged at 180 degrees at the top of the annular additional chamber 1. The annular additional chamber 1 is internally divided into an upper chamber 3 and a lower chamber 4, and the area of the upper chamber 3 is far larger than that of the lower chamber 4; an upper chamber 3 is arranged below the safety protection sheet 2, a movable elastic body 5 is arranged at the bottom of the upper chamber 3, and a lower chamber 4 is arranged below the elastic body 5. The inner side wall of the annular additional chamber 1 and the outer wall of the sleeve 10 are correspondingly provided with a movable rail 6, and the inner side and the outer side of the elastic body 5 are respectively provided with a movable clamping groove 7 matched with the movable rail 6, so that the elastic body 5 can slide up and down in the upper chamber 3. An upper triangular blocking cone 8 is arranged at the upper part of the upper chamber 3, a lower triangular blocking cone 9 is arranged between the bottom of the upper chamber 3 and the top of the lower chamber 4, the elastic body 5 is positioned at the lower triangular blocking cone 9 at the initial position, and after inflation, the position of the elastic body 5 is positioned at the upper triangular blocking cone 8; the sliding range of the elastic body 5 is limited by the upper triangular stop cone 8 and the lower triangular stop cone 9, and the elastic body 5 is prevented from touching the top or the bottom to cause deviation of a motion track. And the gas injection valve is positioned at the bottom of the annular additional chamber 1, is arranged in the lower chamber 4, and injects inert gas into the lower chamber 4 through the gas injection valve.
In the above embodiment, the seal ring 11 is provided at the end of the moving slot 7 to prevent the inert gas from entering the upper chamber 3.
In each of the above embodiments, the gas injection valve includes a gas injection valve base 12, a spring 13, a gas injection valve hemisphere 14, a gas injection hole 15, and a gas injection hole cap 16. The gas injection valve base 12 is arranged on the wall surface of the annular additional cavity 1, one end of a spring 13 is fixed on the gas injection valve base 12, the other end of the spring is connected with a gas injection valve hemisphere 14, and the spring 13 is a cylindrical spring. The wall surface of the annular additional cavity 1 is provided with a gas injection hole 15, and a gas injection valve hemisphere 14 is arranged in the gas injection hole 15. The gas injection hole cap 16 is in threaded connection with the gas injection hole 15, the gas injection hole 15 is sealed by the gas injection hole cap 16, and therefore, in the process of annular confining pressure rising, annular fluid is prevented from entering the lower cavity 4 through extruding the spring 13 connected with the gas injection valve hemisphere 14; and a gas injection hole cap 16 is welded and fixed on the outer wall surface of the annular additional chamber 1 after the gas injection hole 15 is sealed, so that annular trapped fluid is prevented from entering the gas injection hole 15. When the gas injection valve is used, inert gas is injected into the lower cavity 4 through the gas injection hole 15, the gas injection valve hemisphere 14 compresses the spring 13 in the gas injection process, and the gas injection hole 15 is sealed by the spring 13 after the gas injection is completed, so that the gas is prevented from overflowing.
In each of the above embodiments of the sealing ring 11, the upper and lower ends of the annular additional chamber 1 are both inclined surfaces, and the end parts of the inclined surfaces are welded and fixed with the sleeve 10.
In the above embodiments, as shown in fig. 2 and 3, the casing additional chamber pressure relief device of the present invention can be installed in various ways, including directly processing the casing containing the pressure relief tool during the casing production. In order to be easier to operate, the annular additional chamber 1 is formed by splicing two semicircular annular column cavities; mosaic structure possesses that multiple mode is optional, including the concatenation of triangle contact surface, wedge contact surface concatenation etc. for guaranteeing the instrument reliability, the preferred buckle type concatenation of annular additional chamber 1, and two semicircle ring cylinder cavity tip link into an integrated entity through buckle 17, and buckle 17 chucking is fixed with two semicircle ring cylinder cavities through the welding after.
In the above embodiments, the injection gas of the lower chamber 4 is preferably nitrogen gas in view of safety and economy. The injection gas may be an inert gas such as helium or argon.
In the above embodiments, the force adjusting manner of the casing additional chamber pressure relief device can adjust the pressure relief capacity of the single annular additional chamber 1 by adjusting the gas injection amount and the injected gas property, and the effective release of the annular confining pressure is realized by preferably selecting the number of the casing additional chamber pressure relief devices which are put in.
The sleeve additional cavity pressure relief device comprises the following steps:
s1, in the installation process, injecting inert gas into the lower cavity 4 of the annular additional cavity 1 through the gas injection valve, wherein the initial position of the elastomer 5 is located below the annular additional cavity 1 and clings to the lower triangular blocking cone 9; the elastic body 5 slides upwards to the upper part of the annular additional chamber 1 along the moving track 6 through the moving clamping groove 7 in the injection process of the inert gas and is tightly attached to the triangular retaining cone 8; after the gas injection is completed, the gas injection hole cap 16 seals the gas injection hole 15, and prevents the annular confining fluid from entering the lower chamber 4 through the gas injection hole 15 in the process of annular confining pressure rise.
S2, setting the casing 10 with the casing additional chamber pressure relief device, wherein the casing additional chamber pressure relief device can not be opened during the drilling operation and the well cementation operation, and the safety protection plate 2 arranged at the top of the annular additional chamber 1 and the gas injection hole cap 16 arranged at the bottom of the annular additional chamber 1 can ensure the integrity of the casing additional chamber pressure relief device in the drilling operation and the well cementation operation.
S3, in the production test stage, annular confining fluid outside the casing 10 is subjected to heat transfer by high-temperature fluid produced in the production test process in the production string to cause annular confining pressure to rise, when the pressure rises to rated crushing pressure of the safety protection sheet 2, the annular confining fluid crushes the safety protection sheet 2 and enters the upper chamber 3, and the annular confining fluid compresses inert gas in the lower chamber 4 through acting on the elastomer 5 in the expansion process, so that the annular confining pressure is relieved; in the well shutting recovery process, the temperature of the annular confining fluid is reduced, the volume is reduced, and the inert gas in the lower chamber 4 acts on the elastomer 5 to enable the elastomer 5 to move upwards; after the production is continued, the annular trapping fluid is heated and expanded again, and the annular trapping pressure is relieved again by acting on the elastomer 5 to compress the inert gas in the lower chamber 4; the annular confining pressure continuously changes under different working conditions, and the sleeve additional chamber pressure relief device keeps the annular confining pressure within the maximum safe allowable pressure value through the compressibility of inert gas in the lower chamber 4.
The above embodiments are only for illustrating the present invention, and the structure, size, arrangement position and shape of each component can be changed, and on the basis of the technical scheme of the present invention, the improvement and equivalent transformation of the individual components according to the principle of the present invention should not be excluded from the protection scope of the present invention.
Claims (9)
1. The utility model provides a supplementary cavity pressure relief device of sleeve pipe that is used for deep water annular confinement pressure to administer which characterized in that: the device comprises an annular additional chamber, a safety protection plate, an upper chamber, a lower chamber, an elastic body, a movable clamping groove, a movable track and a gas injection valve;
the annular additional chamber is arranged on the sleeve and is arranged along the outer circumference of the sleeve; the safety protection sheet is arranged at the top of the annular additional chamber, and the annular additional chamber is divided into an upper chamber and a lower chamber; the upper chamber is positioned below the safety protection plate, the movable elastic body is arranged at the bottom of the upper chamber, and the lower chamber is positioned below the elastic body; the inner side wall of the annular additional chamber and the outer wall of the sleeve are correspondingly provided with the moving tracks, and the inner side and the outer side of the elastic body are respectively provided with the moving clamping grooves matched with the moving tracks; and the lower cavity is internally provided with the gas injection valve, and inert gas is injected into the lower cavity through the gas injection valve.
2. The pressure relief device of claim 1, wherein: the gas injection valve comprises a gas injection valve base, a spring, a gas injection valve hemisphere, a gas injection hole and a gas injection hole cap; the gas injection valve base is arranged on the wall surface of the annular additional cavity, one end of the spring is fixed on the gas injection valve base, and the other end of the spring is connected with the gas injection valve hemisphere; the gas injection hole is formed in the wall surface of the annular additional cavity, and the gas injection valve hemisphere is arranged in the gas injection hole; the gas injection hole cap is in threaded connection with the gas injection hole, the gas injection hole is plugged through the gas injection hole cap, and the gas injection hole cap is welded and fixed on the outer wall surface of the annular additional cavity after plugging the gas injection hole.
3. The pressure relief device according to claim 1 or 2, wherein: the safety protection plate is symmetrically arranged at 180 degrees at the top of the annular additional chamber.
4. The pressure relief device according to claim 1 or 2, wherein: an upper triangular blocking cone is arranged at the upper part of the upper chamber, a lower triangular blocking cone is arranged between the bottom of the upper chamber and the top of the lower chamber, the elastomer is positioned at the lower triangular blocking cone at the initial position, and after inflation, the elastomer is positioned at the upper triangular blocking cone; the sliding range of the elastic body is limited by the upper triangular stop cone and the lower triangular stop cone.
5. The pressure relief device according to claim 1 or 2, wherein: and a sealing ring is arranged at the end part of the movable clamping groove.
6. The pressure relief device according to claim 1 or 2, wherein: the upper end and the lower end of the annular additional cavity are both inclined planes, and the end parts of the inclined planes are welded and fixed with the sleeve.
7. The pressure relief device according to claim 1 or 2, wherein: the annular additional cavity is formed by splicing two semicircular cylindrical cavities.
8. The pressure relief device of claim 7, wherein: the end parts of the two semi-circular cylinder cavities are connected into a whole through a buckle, and the two semi-circular cylinder cavities are fixed through welding after the buckle is clamped.
9. The pressure relief device of claim 2, wherein: in the production test stage of the pressure relief device, the annular confining fluid outside the sleeve is subjected to heat transfer by high-temperature fluid produced in the production test process in the production string to cause annular confining pressure to rise, when the pressure rises to the rated crushing pressure of the safety protection sheet, the safety protection sheet is crushed by the annular confining fluid to enter the upper chamber, and the annular confining fluid compresses inert gas in the lower chamber through acting on the elastomer in the expansion process, so that the annular confining pressure is relieved; in the well shut-in recovery process, the temperature of the annular confining fluid is reduced, the volume is reduced, and the inert gas in the lower chamber acts on the elastomer to move the elastomer upwards; after the production is continued, the annular trapping fluid is heated and expanded again, and the annular trapping pressure is relieved again by acting on the elastomer to compress the inert gas in the lower chamber; the annular confining pressure is constantly changed under different working conditions, and the annular confining pressure is always kept within the maximum safe allowable pressure value through the compressibility of the inert gas in the lower cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810627562.7A CN108868692B (en) | 2018-06-19 | 2018-06-19 | Casing additional cavity pressure relief device for deepwater annulus trapping pressure treatment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810627562.7A CN108868692B (en) | 2018-06-19 | 2018-06-19 | Casing additional cavity pressure relief device for deepwater annulus trapping pressure treatment |
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| Publication Number | Publication Date |
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| CN108868692A CN108868692A (en) | 2018-11-23 |
| CN108868692B true CN108868692B (en) | 2020-04-28 |
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| CN201810627562.7A Active CN108868692B (en) | 2018-06-19 | 2018-06-19 | Casing additional cavity pressure relief device for deepwater annulus trapping pressure treatment |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111964887B (en) * | 2020-08-17 | 2022-04-12 | 西南石油大学 | Casing annulus pressure relief tool simulation experiment device and test method |
| CN114427372B (en) * | 2020-09-09 | 2024-05-24 | 中国石油化工股份有限公司 | Automatic annular sealing device |
| CN113622873A (en) * | 2021-08-06 | 2021-11-09 | 中海石油(中国)有限公司湛江分公司 | Deepwater gas well annulus pressure intelligent management device and method |
| CN114263438B (en) * | 2021-12-15 | 2023-12-08 | 中海石油(中国)有限公司 | Device and method for releasing sleeve bypass annular pressure of deep water oil-gas well |
| CN114961645B (en) * | 2022-05-23 | 2023-03-10 | 西南石油大学 | Multi-activation bidirectional pressure relief device and method for releasing annular trapping pressure of sleeve |
| CN114961643B (en) * | 2022-06-01 | 2023-05-23 | 西南石油大学 | Recoverable pressure relief device and method for releasing annular entrapment pressure of casing |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7191830B2 (en) * | 2004-02-27 | 2007-03-20 | Halliburton Energy Services, Inc. | Annular pressure relief collar |
| CA2623902C (en) * | 2008-03-05 | 2016-02-02 | Stellarton Technologies Inc. | Downhole fluid recirculation valve |
| CN203145895U (en) * | 2013-03-12 | 2013-08-21 | 中国海洋石油总公司 | Downhole automatic-control sliding sleeve device of multiple-pressure-layer-series oil and gas development |
| US9689241B2 (en) * | 2014-11-26 | 2017-06-27 | General Electric Company | Gas lift valve assemblies having fluid flow barrier and methods of assembling same |
| CN106761554B (en) * | 2016-12-20 | 2019-06-11 | 中国石油天然气股份有限公司 | Pressure release device for casing trap space of deep water oil gas well |
| CN107701147B (en) * | 2017-10-26 | 2023-11-10 | 中国石油大学(北京) | Annulus pressure underground control valve |
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