CN112539041A - Gas production wellhead high-pressure valve structure and manufacturing process thereof - Google Patents
Gas production wellhead high-pressure valve structure and manufacturing process thereof Download PDFInfo
- Publication number
- CN112539041A CN112539041A CN202011401456.0A CN202011401456A CN112539041A CN 112539041 A CN112539041 A CN 112539041A CN 202011401456 A CN202011401456 A CN 202011401456A CN 112539041 A CN112539041 A CN 112539041A
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- ring
- sealing
- gas production
- fixedly connected
- seat
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/02—Valve arrangements for boreholes or wells in well heads
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/001—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass valves or valve housings
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/08—Obtaining fluid samples or testing fluids, in boreholes or wells
Abstract
The invention discloses a gas production well mouth high-pressure valve structure and a manufacturing process thereof.A sealing seat is arranged in a pipe body of a supporting assembly, a first sealing ring is arranged at one side of the sealing seat, a drying shell and a drying core of the sealing assembly are arranged at one side of the sealing seat far away from the first sealing ring, a first limiting ring and a second sealing ring are arranged in the sealing seat, a control rod of a control assembly packet is connected with the second sealing ring in a sliding manner, a push ring is arranged on the control rod, a sealing head is connected with the control rod and is contacted with the first sealing ring, and a gas production pipe and a connecting head are communicated with the sealing seat. The drying shell and the drying core can absorb moisture permeating from the gap between the control rod and the seal seat, so that the anti-freezing performance can be increased, the push ring is in gas contact with the cavity formed by the first limiting ring and the second sealing ring, so that the entering moisture can be dispersed in the cavity more, the adhesion on the push ring is reduced, and the control rod is not easy to freeze with the seal seat under the low-temperature condition.
Description
Technical Field
The invention relates to the field of oil exploitation equipment, in particular to a gas production wellhead high-pressure valve structure and a manufacturing process thereof.
Background
In oil field production, oil samples of each oil well need to be collected frequently, which is commonly called sampling. In the prior art, high-pressure wellhead valves (namely sampling valves) for sampling are common ball valves or gate valves, and in cold winter, because the water content of an oil sample is very high (most of the existing oil fields in China enter the middle and later stages of exploitation, the water content of the oil sample is usually not lower than 90%), the wellhead valves are often frozen, so that the sampling work cannot be normally carried out.
Disclosure of Invention
The invention aims to provide a gas production wellhead high-pressure valve structure and a manufacturing process thereof, and aims to solve the problem that the existing valve is easy to freeze and inconvenient to use under a low-temperature condition.
In order to achieve the above object, in a first aspect, the present invention provides a gas production wellhead high pressure valve structure, which includes a support assembly, a control assembly, a sealing assembly and a gas production assembly, wherein the support assembly includes a pipe body, a sealing seat and a first sealing ring, the sealing seat has a first through hole, the sealing seat is fixedly connected with the pipe body and is located in the pipe body, the first sealing ring is fixedly connected with the sealing seat and is located at one side of the sealing seat, the sealing assembly includes a drying shell, a drying core, a first limit ring and a second sealing ring, the drying shell is fixedly connected with the sealing seat and is located at one side of the first through hole, the drying core is fixedly connected with the drying shell and is located between the drying shell and the sealing seat, and the first limit ring and the second sealing ring are fixedly connected with the sealing seat, and be located in the seal receptacle, the control assembly includes control lever, throw-out collar and sealed head, the control lever with first spacing ring with second sealing ring sliding connection, and be located in the first through-hole, the throw-out collar with control lever fixed connection, and be located first spacing ring with between the second sealing ring, sealed head with control lever fixed connection, and with first sealing ring contact, the gas production subassembly includes gas production pipe and connector, the gas production pipe with the seal receptacle intercommunication, and be located one side of seal receptacle, the connector with gas production pipe fixed connection, and be located one side of gas production pipe.
The control rod comprises a rod body and a heating core body, the rod body is provided with a second groove, and the heating core body is fixedly connected with the rod body and is positioned in the second groove.
The control rod further comprises a handle, and the handle is fixedly connected with the rod body and is positioned on one side of the rod body.
The control assembly further comprises a first compression spring and a clamping ring, the clamping ring is fixedly connected with the control rod and is positioned on one side, close to the sealing head, of the control rod, and the first compression spring is fixedly connected with the clamping ring and is positioned between the clamping ring and the first sealing ring.
The gas production assembly further comprises a protective cover, and the protective cover is rotatably connected with the connector and is positioned on one side of the connector.
The first limiting ring comprises a ring body and a support ring, and the support ring is fixedly connected with the ring body and is positioned between the ring body and the second sealing ring.
In a second aspect, the present invention provides a manufacturing process of a gas production wellhead high pressure valve structure, including: cutting a section to form rudiments of a first limiting ring and a second sealing ring, and polishing and forming;
assembling the first limiting ring, the control rod and the second sealing ring with the sealing seat in sequence, and coating sealant on the second sealing ring; assembling a drying shell and a drying core with a sealing seat in sequence; assembling the first sealing ring with the sealing seat; the sealing head and the control rod are assembled, thereby completing the manufacturing.
The gas production wellhead high-pressure valve structure and the manufacturing process thereof comprise that a sealing seat is fixedly connected with a pipe body, the pipe body is inserted into the ground for fixing and isolating the sealing seat from a wellhead, a first sealing ring is fixedly connected with the sealing seat, a drying shell is fixedly connected with the sealing seat, a drying core is fixedly connected with the drying shell, the drying shell is used for sealing the drying core, moisture entering from a gap outside can be absorbed through the drying core so as to keep the inside dry, a first limiting ring and a second sealing ring are fixedly connected with the sealing seat, a control rod is slidably connected with the first limiting ring and the second sealing ring, a push ring is fixedly connected with the control rod, and the control rod can slide relative to the first limiting ring and the second sealing ring, the position of the push ring can be limited by the first limit ring, and a space is formed between the first limit ring and the second sealing ring, so that heat conduction can be reduced, and the contact area of the push ring and the sealing seat is reduced to reduce the freezing degree. The sealing head is fixedly connected with the control rod, the sealing head is matched with the first sealing ring to be sealed, gas is sealed, the control rod is pressed down to open the sealing head and the same channel of the first sealing ring, and the gas production pipe is connected with an external gas production device through the connector, so that gas production can be performed. Through setting up the exit of seal receptacle the dry shell to place dry core in the dry shell, make can absorb follow the control lever with the moisture of seal receptacle gap infiltration, avoid the junction moisture too much, make can increase freeze proof performance, in addition be in the both sides of push ring set up the second sealing ring with first spacing ring, can pass through the gas contact in push ring and the vacuole formation for the moisture of entering can disperse in the cavity more, thereby reduce adhere to on the push ring, thereby can make under the low temperature condition, the control lever be difficult for with the seal receptacle takes place to freeze, and can use for a long time, thereby solve current valve and freeze easily under the low temperature condition and be inconvenient in use's problem.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a block diagram of a gas recovery wellhead high pressure valve configuration of the present invention;
FIG. 2 is a schematic cross-sectional view of a gas recovery wellhead high pressure valve configuration of the present invention;
fig. 3 is a flow chart of a manufacturing process of a gas recovery wellhead high pressure valve structure of the present invention.
1-supporting component, 2-control component, 3-sealing component, 4-gas production component, 11-pipe body, 12-sealing seat, 13-first sealing ring, 21-control rod, 22-push ring, 23-sealing head, 24-first compression spring, 25-snap ring, 31-drying shell, 32-drying core, 33-first limiting ring, 34-second sealing ring, 41-gas production pipe, 42-connecting head, 43-protective cover, 121-seat body, 122-second limiting ring, 123-sealing ring, 124-first through hole, 211-rod body, 212-heating core body, 213-second groove, 214-handle, 331-ring body and 332-supporting ring.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. Further, in the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Referring to fig. 1 to 2, the present invention provides a gas production wellhead high pressure valve structure, including:
the gas production device comprises a supporting component 1, a control component 2, a sealing component 3 and a gas production component 4, wherein the supporting component 1 comprises a pipe body 11, a sealing seat 12 and a first sealing ring 13, the sealing seat 12 is provided with a first through hole 124, the sealing seat 12 is fixedly connected with the pipe body 11 and is positioned in the pipe body 11, the first sealing ring 13 is fixedly connected with the sealing seat 12 and is positioned at one side of the sealing seat 12, the sealing component 3 comprises a drying shell 31, a drying core 32, a first limiting ring 33 and a second sealing ring 34, the drying shell 31 is fixedly connected with the sealing seat 12 and is positioned at one side of the first through hole 124, the drying core 32 is fixedly connected with the drying shell 31 and is positioned between the drying shell 31 and the sealing seat 12, the first limiting ring 33 and the second sealing ring 34 are fixedly connected with the sealing seat 12 and are positioned in the sealing seat 12, control assembly 2 includes control lever 21, throw-out collar 22 and sealed head 23, control lever 21 with first spacing ring 33 with second sealing ring 34 sliding connection, and be located in first through-hole 124, throw-out collar 22 with control lever 21 fixed connection, and be located first spacing ring 33 with between the second sealing ring 34, sealed head 23 with control lever 21 fixed connection, and with first sealing ring 13 contacts, gas production subassembly 4 includes gas production pipe 41 and connector 42, gas production pipe 41 with seal receptacle 12 communicates, and is located one side of seal receptacle 12, connector 42 with gas production pipe 41 fixed connection, and be located one side of gas production pipe 41.
In this embodiment, the support assembly 1 includes a tube 11, a seal seat 12 and a first sealing ring 13, the seal seat 12 has a first through hole 124, the seal seat 12 is fixedly connected with the tube 11 and located in the tube 11, the tube 11 is inserted into the ground to be fixed and isolate the seal seat 12 from the wellhead, the first sealing ring 13 is fixedly connected with the seal seat 12 and located at one side of the seal seat 12, the seal assembly 3 includes a drying shell 31, a drying core 32, a first limiting ring 33 and a second sealing ring 34, the drying shell 31 is fixedly connected with the seal seat 12 and located at one side of the first through hole 124, the drying core 32 is fixedly connected with the drying shell 31 and located between the drying shell 31 and the seal seat 12, the drying shell 31 is used for forming a seal for the drying core 32, the drying core 32 is made of a water absorbing material, such as absorbing resin, so that moisture entering from a gap from the outside can be absorbed through the drying core 32, thereby keeping the inside dry and reducing the degree of freezing, the first limiting ring 33 and the second sealing ring 34 are fixedly connected with the seal holder 12 and are located in the seal holder 12, the control assembly 2 includes a control rod 21, a push ring 22 and a sealing head 23, the control rod 21 is slidably connected with the first limiting ring 33 and the second sealing ring 34 and is located in the first through hole 124, the push ring 22 is fixedly connected with the control rod 21 and is located between the first limiting ring 33 and the second sealing ring 34, the control rod 21 can slide relative to the first limiting ring 33 and the second sealing ring 34, and the position of the push ring 22 can be limited by the first limiting ring 33, while forming a space between the first retainer ring 33 and the second seal ring 34, so that heat conduction can be reduced, while reducing the contact area of the push ring 22 and the seal holder 12 to reduce the degree of freezing. Sealed head 23 with control lever 21 fixed connection, and with the contact of first sealing ring 13, through sealed head 23 with first sealing ring 13 cooperates in order to seal for gas is sealed, pushes down control lever 21 can open sealed head 23 with the same way of first sealing ring 13, gas production subassembly 4 includes gas production pipe 41 and connector 42, gas production pipe 41 with seal receptacle 12 communicates, and is located one side of seal receptacle 12, connector 42 with gas production pipe 41 fixed connection, and is located one side of gas production pipe 41, through connector 42 can with gas production pipe 41 and outside gas production device connect to can adopt gas. The drying shell 31 is arranged at the outlet of the sealing seat 12, the drying core 32 is arranged in the drying shell 31, so that the moisture permeating from the gap between the control rod 21 and the sealing seat 12 can be absorbed, the excessive moisture at the joint is avoided, the frost resistance can be improved, in addition, the second sealing ring 34 and the first limiting ring 33 are arranged at the two sides of the push ring 22, the push ring 22 can be contacted with the gas in the formed cavity, so that the entering moisture can be more dispersed in the cavity, the adhesion on the push ring 22 is reduced, the control rod 21 is not easy to freeze with the sealing seat 12 under the low temperature condition, the valve can be used for a long time, and the problem that the existing valve is easy to freeze and inconvenient to use under the low temperature condition is solved.
Further, the control rod 21 includes a rod body 211 and a heating core body 212, the rod body 211 has a second groove 213, and the heating core body 212 is fixedly connected to the rod body 211 and is located in the second groove 213.
In this embodiment, the heating core 212 is mainly composed of a heating resistor, and the heating core 212 is placed in the second groove 213, so that when the heating core is difficult to push after long-time non-use, an external power supply is connected to the heating resistor to heat the control rod 21 and melt the frozen part, thereby facilitating the continuous use.
Further, the control assembly 2 further comprises a first compression spring 24 and a snap ring 25, the snap ring 25 is fixedly connected with the control rod 21 and is located on one side of the control rod 21 close to the sealing head 23, and the first compression spring 24 is fixedly connected with the snap ring 25 and is located between the snap ring 25 and the first sealing ring 13.
In this embodiment, the snap ring 25 is disposed on the control rod 21 so that the position of the control rod 21 can be limited by the groove in the seal housing 12, and then the first compression spring 24 is disposed between the snap ring 25 and the first seal ring 13 so that the snap ring 25 can be clamped on the seal housing 12 by the urging force of the spring, so that the seal head 23 can be closely contacted with the first seal ring 13, thereby improving the sealing effect.
Further, the control lever 21 further comprises a handle 214, and the handle 214 is fixedly connected with the lever body 211 and is located on one side of the lever body 211.
In this embodiment, the handle 214 is disposed at one side of the rod 211, so that it is more convenient to push.
Further, the sealing seat 12 includes a seat body 121 and a second limiting ring 122, and the second limiting ring 122 is fixedly connected to the seat body 121 and is located at one side of the gas production pipe 41.
In this embodiment, the second limiting ring 122 is disposed on one side of the seat body 121, and can limit the installation depth of the seat body 121 sliding into the tube body 11, so as to facilitate installation, and prevent the gas production tube 41 from touching the tube body 11, thereby preventing damage.
Further, the seal seat 12 further includes a seal ring 123, and the seal ring 123 is fixedly connected to the second limit ring 122 and is located on one side of the second limit ring 122.
In this embodiment, the sealing ring is provided on one side of the second stopper ring 122 so that a gap can be sealed when the second stopper ring 122 and the pipe body 11 are attached, thereby reducing leakage.
Further, the gas production assembly 4 further comprises a protective cover 43, and the protective cover 43 is rotatably connected with the connector 42 and is located on one side of the connector 42.
In this embodiment, the protective cover 43 is disposed on one side of the connector 42 for sealing the collection tube when gas is not required to be taken, so as to reduce the possibility of water vapor entering the collection tube.
Further, the first limiting ring 33 includes a ring body 331 and a support ring 332, and the support ring 332 is fixedly connected to the ring body 331 and is located between the ring body 331 and the second sealing ring 34.
In the present embodiment, the support ring 332 is used for supporting and positioning the second seal ring 34 after being assembled into the ring body 331, and at the same time, the push ring 22 can slide relative to the ring body 331, and the ring body 331 is mainly made of hydrophobic materials such as polyolefin, polyamide, and the like, so that the adhesion of moisture can be reduced, and the possibility of freezing of the push ring 22 and the ring body 331 can be further reduced, and the use in winter is easier.
In a second aspect, referring to fig. 3, the present invention further provides a manufacturing process of a gas production wellhead high pressure valve structure, including:
s101, cutting the pipe body 11 and the sealing seat 12 by using 304 stainless steel as a blank, and turning and polishing to form;
s102, cutting a section to form rudiments of the first limiting ring 33 and the second sealing ring 34, and polishing and forming;
the same processes as those of the pipe body 11 and the first stopper ring 33 are adopted to process other parts, so that all parts can be obtained.
S103, sequentially assembling the first limiting ring 33, the control rod 21 and the second sealing ring 34 with the sealing seat 12, and coating a sealant on the second sealing ring 34;
the sealing performance can be enhanced by applying a sealant to the second sealing ring 34.
S104, sequentially assembling the drying shell 31 and the drying core 32 with the sealing seat 12;
s105, assembling the first sealing ring 13 with the sealing seat 12;
s106 assembles the sealing head 23 and the control rod 21, thereby completing the manufacture.
The drying shell 31 is arranged at the outlet of the sealing seat 12, the drying core 32 is arranged in the drying shell 31, so that the moisture permeating from the gap between the control rod 21 and the sealing seat 12 can be absorbed, the excessive moisture at the joint is avoided, the frost resistance can be improved, in addition, the second sealing ring 34 and the first limiting ring 33 are arranged at the two sides of the push ring 22, the push ring 22 can be contacted with the gas in the formed cavity, so that the entering moisture can be more dispersed in the cavity, the adhesion on the push ring 22 is reduced, the control rod 21 is not easy to freeze with the sealing seat 12 under the low temperature condition, the valve can be used for a long time, and the problem that the existing valve is easy to freeze and inconvenient to use under the low temperature condition is solved.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A gas production wellhead high pressure valve structure, which is characterized in that,
comprises a supporting component, a control component, a sealing component and a gas production component, wherein the supporting component comprises a pipe body, a sealing seat and a first sealing ring, the sealing seat is provided with a first through hole, the sealing seat is fixedly connected with the pipe body and is positioned in the pipe body, the first sealing ring is fixedly connected with the sealing seat and is positioned on one side of the sealing seat, the sealing component comprises a drying shell, a drying core, a first limiting ring and a second sealing ring, the drying shell is fixedly connected with the sealing seat and is positioned on one side of the first through hole, the drying core is fixedly connected with the drying shell and is positioned between the drying shell and the sealing seat, the first limiting ring and the second sealing ring are fixedly connected with the sealing seat and are positioned in the sealing seat, the control component comprises a control rod, a push ring and a sealing head, the control rod is slidably connected with the first limiting ring and the second sealing ring, and is located in the first through-hole, the throw-out collar with control lever fixed connection, and be located first spacing ring with between the second sealing ring, sealed head with control lever fixed connection, and with first sealing ring contact, the gas production subassembly includes gas production pipe and connector, the gas production pipe with the seal receptacle intercommunication, and be located one side of seal receptacle, the connector with gas production pipe fixed connection, and be located one side of gas production pipe.
2. The gas recovery wellhead high pressure valve structure as claimed in claim 1,
the control rod comprises a rod body and a heating core body, the rod body is provided with a second groove, and the heating core body is fixedly connected with the rod body and is positioned in the second groove.
3. The gas recovery wellhead high pressure valve structure as claimed in claim 2,
the control rod further comprises a handle, and the handle is fixedly connected with the rod body and is positioned on one side of the rod body.
4. The gas recovery wellhead high pressure valve structure as claimed in claim 3,
the control assembly further comprises a first compression spring and a clamping ring, the clamping ring is fixedly connected with the control rod and is positioned on one side, close to the sealing head, of the control rod, and the first compression spring is fixedly connected with the clamping ring and is positioned between the clamping ring and the first sealing ring.
5. The gas recovery wellhead high pressure valve structure as claimed in claim 1,
the gas production assembly further comprises a protective cover, and the protective cover is rotatably connected with the connector and is positioned on one side of the connector.
6. The gas recovery wellhead high pressure valve structure as claimed in claim 5,
the first limiting ring comprises a ring body and a support ring, and the support ring is fixedly connected with the ring body and is positioned between the ring body and the second sealing ring.
7. A manufacturing process of a gas production wellhead high-pressure valve structure is characterized in that,
the method comprises the following steps: cutting the pipe body and the sealing seat by using 304 stainless steel as a blank, and turning and polishing to form;
cutting a section to form rudiments of a first limiting ring and a second sealing ring, and polishing and forming;
assembling the first limiting ring, the control rod and the second sealing ring with the sealing seat in sequence, and coating sealant on the second sealing ring;
assembling a drying shell and a drying core with a sealing seat in sequence;
assembling the first sealing ring with the sealing seat;
the sealing head and the control rod are assembled, thereby completing the manufacturing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011401456.0A CN112539041B (en) | 2020-12-02 | 2020-12-02 | Gas production wellhead high-pressure valve structure and manufacturing process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011401456.0A CN112539041B (en) | 2020-12-02 | 2020-12-02 | Gas production wellhead high-pressure valve structure and manufacturing process thereof |
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| Publication Number | Publication Date |
|---|---|
| CN112539041A true CN112539041A (en) | 2021-03-23 |
| CN112539041B CN112539041B (en) | 2023-03-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011401456.0A Active CN112539041B (en) | 2020-12-02 | 2020-12-02 | Gas production wellhead high-pressure valve structure and manufacturing process thereof |
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| CN201705290U (en) * | 2010-06-24 | 2011-01-12 | 盐城华跃石油机械制造有限公司 | Novel constant pressure relief valve |
| CN202493240U (en) * | 2011-11-11 | 2012-10-17 | 赵延平 | Antifreeze-type pressure-stabilizing and gas discharging oil extraction composite set |
| CN203891836U (en) * | 2014-05-08 | 2014-10-22 | 西安东新石油设备厂有限公司 | Safety protection device for gas pipelines of high-yield natural gas wells |
| CN204402424U (en) * | 2014-11-20 | 2015-06-17 | 西安东新石油设备厂有限公司 | A kind of external pressure differential natural gas well gas pipeline safety guard |
| CN206600159U (en) * | 2017-03-22 | 2017-10-31 | 刘利娜 | Adjustable anti-sulphur gas well mouth safety device |
| CN211287593U (en) * | 2019-11-27 | 2020-08-18 | 徐立明 | Oil field oil recovery well head well plugging device |
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2020
- 2020-12-02 CN CN202011401456.0A patent/CN112539041B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201705290U (en) * | 2010-06-24 | 2011-01-12 | 盐城华跃石油机械制造有限公司 | Novel constant pressure relief valve |
| CN202493240U (en) * | 2011-11-11 | 2012-10-17 | 赵延平 | Antifreeze-type pressure-stabilizing and gas discharging oil extraction composite set |
| CN203891836U (en) * | 2014-05-08 | 2014-10-22 | 西安东新石油设备厂有限公司 | Safety protection device for gas pipelines of high-yield natural gas wells |
| CN204402424U (en) * | 2014-11-20 | 2015-06-17 | 西安东新石油设备厂有限公司 | A kind of external pressure differential natural gas well gas pipeline safety guard |
| CN206600159U (en) * | 2017-03-22 | 2017-10-31 | 刘利娜 | Adjustable anti-sulphur gas well mouth safety device |
| CN211287593U (en) * | 2019-11-27 | 2020-08-18 | 徐立明 | Oil field oil recovery well head well plugging device |
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| Publication number | Publication date |
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| CN112539041B (en) | 2023-03-28 |
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