CN110905445B - Valve leakage controller and method for wellhead of gas well - Google Patents
Valve leakage controller and method for wellhead of gas well Download PDFInfo
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- CN110905445B CN110905445B CN201911170335.7A CN201911170335A CN110905445B CN 110905445 B CN110905445 B CN 110905445B CN 201911170335 A CN201911170335 A CN 201911170335A CN 110905445 B CN110905445 B CN 110905445B
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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
- E21B34/02—Valve arrangements for boreholes or wells in well heads
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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)
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- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Details Of Valves (AREA)
- Sliding Valves (AREA)
Abstract
The invention provides a valve leakage controller and a method for a wellhead of a gas well, wherein the valve leakage controller comprises a gas control device, a screw rod, an upper flange plate and a lower flange plate, the upper flange plate is positioned above the lower flange plate, and the upper flange plate is connected with the lower flange plate through a plurality of screw rods; the air control device is arranged on the upper flange plate. When the internal combined seal (packing) of the leakage valve fails, the valve leakage controller is installed, the valve is slowly opened by rotating the switch connecting rod, namely the inner core, when the valve is opened to the maximum position, a tool is used for blocking a valve gas channel, after the blocking tool is blocked, the leakage gas in the gas control device body is discharged by the gas discharging device, after the gas is completely discharged, the corresponding sealing spacer ring and the transition piston ring are removed, the upper shell of the valve is removed, and the combined seal is replaced, so that the occurrence of danger is avoided.
Description
Technical Field
The invention relates to the technical field of petroleum and natural gas exploitation, in particular to a valve leakage controller and a method for a wellhead of a gas well.
Background
The leakage of the natural gas wellhead valve occurs, and particularly, in some old wells, the sealing rings and the like in the valve are damaged due to the perennial corrosion, so that unsafe accidents occur at the natural gas wellhead. In addition to the frequent grease filling to service the necessary bearings, replacement seals are also necessary.
The natural gas wellhead open-air device and the environment of the use place are complex, so that professional maintenance is needed after the natural gas wellhead open-air device is used for a certain time, and especially, the failed parts and the vulnerable parts are replaced, the missing parts are repaired and the like. The combined sealing of the valves is generally effective for 1-2 years, and the service life of most valves of natural gas wellhead is far longer than that of the valves. This results in leakage of the valve. Leakage of the valve along the valve stem, copper nut, gate valve upper housing due to failure of the combination seal.
Replacement of the combination seal is often critical to solving this problem, and replacement is often accompanied by a certain risk when leaking.
Disclosure of Invention
In order to overcome the problems that the leakage of a valve along a valve rod, a copper nut and a gate valve upper shell is caused by the failure of the conventional combined seal, and the replacement of the combined seal is accompanied by a certain danger during the common leakage, the invention provides a valve leakage controller and a method for a gas well wellhead.
The invention adopts the technical scheme that:
the valve leakage controller for the wellhead of the gas well comprises a gas control device, a screw rod, an upper flange plate and a lower flange plate, wherein the upper flange plate is positioned above the lower flange plate, and the upper flange plate is connected with the lower flange plate through a plurality of screw rods; the air control device is arranged on the upper flange plate.
The gas control device at least comprises a transition piston ring sleeved on the outer side of the lower part of the valve rod nut, and the lower end of the transition piston ring downwards penetrates through the upper flange plate and is connected with the lower surface of the upper flange plate through outer threads; the transition piston ring is characterized in that a sealing spacer ring is arranged on the middle annular table surface of the transition piston ring, an outer cylinder is arranged outside the sealing spacer ring, a pressing cap is arranged at the top of the sealing spacer ring, a through hole is formed in the top of the pressing cap, an inner core is connected to the inner portion of the through hole in a penetrating manner, and the lower portion of the inner core is located inside the sealing spacer ring.
The inner core is of a hexagonal structure, and a plurality of sealing rings and O-rings are arranged between the outer surface of the lower part of the inner core and the inner surface of the sealing spacer ring.
The sealing spacer ring is in threaded connection with the middle annular table surface of the transition piston ring, and a sealing ring is arranged between the sealing spacer ring and the middle annular table surface of the transition piston ring.
The three-way valve is fixed outside the outer cylinder, the three-way valve is communicated with the sealing spacer ring, and the three-way valve is fixed with the high-pressure air release stop valve and the pressure gauge.
The outer side of the transition piston ring is provided with a limiting plate, and the limiting plate is fixed on the upper surface of the upper flange plate.
A valve leakage control method for a gas well wellhead comprises the following specific steps: when the internal combined seal of the external leakage valve fails and the external leakage condition of gas occurs, the valve external leakage controller is installed, the valve is slowly opened through the inner core, when the valve is opened to the maximum position, a tool is used for blocking a valve gas channel, after the blocking tool is blocked, the external leakage gas in the gas control device is discharged through the deflation stop valve, after the gas is completely discharged, the corresponding sealing spacer ring and the transition piston ring are removed, the upper shell of the valve is removed, and the combined seal is replaced.
The beneficial effects of the invention are as follows:
when the internal combined seal (packing) of the leakage valve fails, the valve leakage controller is installed, the valve is slowly opened by rotating the switch connecting rod, namely the inner core, when the valve is opened to the maximum position, a tool is used for blocking a valve gas channel, after the blocking tool is blocked, the leakage gas in the gas control device body is discharged by the gas discharging device, after the gas is completely discharged, the corresponding sealing spacer ring and the transition piston ring are removed, the upper shell of the valve is removed, and the combined seal is replaced, so that the occurrence of danger is avoided.
Further description will be made below with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
fig. 2 is a schematic cross-sectional structure of the present invention.
In the figure: 1. a screw; 2. a limiting plate; 3. transitional piston rings; 4. a tee joint; 5. sealing the spacer ring; 6. an inner core; 7. an O-ring; 8. a seal ring; 9. an upper flange plate; 10. a lower flange plate; 11. an outer cylinder.
Detailed Description
Example 1:
in order to overcome the problems that the leakage of the valve along the valve rod, the copper nut and the upper shell of the gate valve caused by the failure of the combined seal in the prior art can be caused, and a certain danger can be caused by the replacement of the combined seal when the combined seal is normally leaked outwards, the invention provides the valve leakage controller and the method for the wellhead of the gas well, which are shown in the figures 1-2.
The valve leakage controller for the wellhead of the gas well comprises a gas control device, a screw 1, an upper flange plate 9 and a lower flange plate 10, wherein the upper flange plate 9 is positioned above the lower flange plate 10, and the upper flange plate 9 is connected with the lower flange plate 10 through a plurality of screws 1; the air control device is arranged on the upper flange plate 9.
When the internal combined seal (packing) of the leakage valve fails and the gas leakage condition occurs, the valve leakage controller is installed, the valve is slowly opened by rotating the switch connecting rod, namely the inner core 6, when the valve is opened to the maximum position, a tool is used for blocking a valve gas channel, after the blocking tool is blocked, the gas leakage in the gas control device is discharged by using the gas release stop valve, after the gas is completely discharged, the corresponding sealing spacer ring 5 and the transition piston ring 3 are removed, the upper shell of the valve is removed, the combined seal is replaced, and the occurrence of danger is avoided.
Example 2:
based on the embodiment 1, in this embodiment, the gas control device at least includes a transitional piston ring 3 sleeved on the outer side of the lower portion of the valve rod nut, where the lower end of the transitional piston ring 3 passes through the upper flange plate 9 downwards and is connected with the lower surface of the upper flange plate 9 through an outer thread; the transition piston ring is characterized in that a sealing spacer ring 5 is arranged on the annular table top in the middle of the transition piston ring 3, an outer cylinder 11 is arranged outside the sealing spacer ring 5, a pressing cap is arranged at the top of the sealing spacer ring 5, a through hole is formed in the top of the pressing cap, an inner core 6 is connected to the inner portion of the through hole in a penetrating mode, and the lower portion of the inner core 6 is located inside the sealing spacer ring 5.
The inner core 6 is of a hexagonal structure, and a plurality of sealing rings 8 and O-rings 7 are arranged between the outer surface of the lower part of the inner core 6 and the inner surface of the sealing spacer ring 5.
Further, the lower part of the inner core 6 is of an inner hexagonal structure, a plurality of sealing rings 8 and O-rings 7 are arranged between the outer surface of the lower part of the inner core 6 and the inner surface of the sealing spacer ring 5 at intervals, the inner hexagonal structure of the lower part of the inner core 6 can be matched with the outer hexagonal structure of the upper part of the valve rod nut, and a sealed inner cavity is formed through the action between the sealing rings 8 and the O-rings 7.
The sealing spacer ring 5 is in threaded connection with the middle annular table surface of the transition piston ring 3, and a sealing ring 8 is arranged between the sealing spacer ring 5 and the middle annular table surface of the transition piston ring 3.
Further, the sealing spacer ring 5 is in threaded connection with the middle annular table surface of the transitional piston ring 3, and a sealing ring 8 is arranged between the sealing spacer ring 5 and the middle annular table surface of the transitional piston ring 3, so that the sealing spacer ring 5 can be firmly fixed in the transitional piston ring 3, and a cavity of the air device is formed.
The three-way valve 4 is fixed outside the outer cylinder 11, the three-way valve 4 is communicated with the sealing spacer ring 5, and the three-way valve 4 is fixed with a high-pressure deflation stop valve and a pressure gauge.
Further, a tee joint 4 is fixed outside the outer cylinder 11, the tee joint 4 is communicated with the sealing spacer ring 5, a high-pressure air release stop valve and a pressure gauge are fixed on the tee joint 4, when the pressure reaches a set limit, a high-pressure air release pipe can be connected behind the air release stop valve, the air release stop valve is opened, and air in a cavity is discharged through the sealing spacer ring 5 and the excessive piston valve 3 by means of rubber pipe diversion.
The outer side of the transition piston ring 3 is provided with a limiting plate 2, and the limiting plate 2 is fixed on the upper surface of the upper flange plate 9.
Further, the outer side of the transition piston ring 3 is positioned on the upper surface of the upper flange plate 9, a limiting plate 2 is fixed on the upper surface of the upper flange plate 9, a part which is removed through 180-degree opposite milling is designed to be a plane, the limiting plate 2 is additionally arranged, the limiting plate is fixed on four tensioning nuts, and when the tensioning nuts tighten the outer cylinder 11 at the same time, the problem that the operation space is small and the tightening is difficult is solved.
Further, the outside threaded connection of transition piston ring 3 has last flange board 9, and the below of going up flange board 9 is equipped with down flange board 10, is equipped with a plurality of screw rod 1 between last flange board 9 and the lower flange board 10, is connected through a plurality of screw rod 1 between last flange board 9 and the lower flange board 10, can fix whole accuse gas device on leaking the valve outward to play a guard action.
A valve leakage control method for a gas well wellhead comprises the following specific steps: when the internal combined seal of the external leakage valve fails and the external leakage condition of gas occurs, the valve external leakage controller is installed, the valve is slowly opened through the inner core 6, when the valve is opened to the maximum position, a tool is used for blocking a valve gas channel, after the blocking tool is blocked, the external leakage gas in the gas control device is discharged by the deflation stop valve, after the gas is completely discharged, the corresponding sealing spacer ring 5 and the transition piston ring 3 are removed, the upper shell of the valve is removed, and the combined seal is replaced.
The invention provides a valve leakage controller for a gas well wellhead, which comprises a gas control device arranged on a leakage valve, wherein the gas control device comprises a transition piston ring 3 sleeved on the outer side of the lower part of a valve rod nut, a sealing separation ring 5 is arranged on an annular table surface in the middle of the transition piston ring 3, an outer cylinder 11 is arranged outside the sealing separation ring 5, a pressing cap is integrally formed at the top of the sealing separation ring 5, a through hole is arranged at the top of the pressing cap, an inner core 6 is connected in the through hole in a penetrating way, the lower part of the inner core 6 is positioned in the sealing separation ring 5, after the inner combined seal (packing) of the leakage valve fails, the valve leakage controller is arranged, the valve is slowly opened by rotating a switch connecting rod, namely the inner core 6, when the valve is opened to the maximum position, a tool is used for blocking a valve gas channel, after a blocking tool is blocked, the leakage gas in the gas control device body is discharged by using a deflation stop valve, after the gas discharge is completed, the corresponding sealing separation ring 5 and the piston ring 3 are removed, and the upper shell of the valve is removed, and the danger of the combination is avoided.
Finally, it should be noted that the above examples are only for illustrating the technical embodiments of the present method and not for limiting the same, and although the present invention has been described in detail with reference to the preferred examples, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical embodiments of the present invention, which are all encompassed by the scope of the claims of the present invention. The apparatus and method described in detail in this invention are all prior art and will not be further described in this invention.
Claims (2)
1. A valve leakage control method for a gas well wellhead is characterized by comprising the following steps of: the valve leakage controller for the gas well wellhead comprises a gas control device, a screw (1), an upper flange plate (9) and a lower flange plate (10), wherein the upper flange plate (9) is positioned above the lower flange plate (10), and the upper flange plate (9) is connected with the lower flange plate (10) through a plurality of screws (1); the air control device is arranged on the upper flange plate (9); the gas control device at least comprises a transition piston ring (3) sleeved on the outer side of the lower part of the valve rod nut, wherein the lower end of the transition piston ring (3) downwards passes through the upper flange plate (9) and is connected with the lower surface of the upper flange plate (9) through outer threads; the transition piston ring is characterized in that a sealing spacer ring (5) is arranged on the middle annular table top of the transition piston ring (3), an outer cylinder (11) is arranged outside the sealing spacer ring (5), a pressing cap is arranged at the top of the sealing spacer ring (5), a through hole is formed in the top of the pressing cap, an inner core (6) is connected to the inside of the through hole in a penetrating way, and the lower part of the inner core (6) is positioned inside the sealing spacer ring (5); the inner core (6) is of a hexagonal structure, and a plurality of sealing rings (8) and O-rings (7) are arranged between the outer surface of the lower part of the inner core (6) and the inner surface of the sealing spacer ring (5); the outer side of the transition piston ring (3) is provided with a limiting plate (2), and the limiting plate (2) is fixed on the upper surface of the upper flange plate (9); the limiting plates (2) are fixed on the four tensioning nuts and are used for tightening the outer cylinder (11); the three-way valve (4) is fixed outside the outer cylinder (11), the three-way valve (4) is communicated with the sealing spacer ring (5), and the three-way valve (4) is fixed with a high-pressure deflation stop valve and a pressure gauge;
the valve leakage control method for the wellhead of the gas well comprises the following specific steps: when the internal combined seal of the external leakage valve fails and the external leakage condition of gas occurs, the external leakage controller of the valve is installed, the valve is slowly opened through the inner core (6), when the valve is opened to the maximum position, a tool is used for blocking a gas channel of the valve, after the blocking tool is blocked, the external leakage gas in the gas control device is discharged through the gas release stop valve, after the gas is completely discharged, the corresponding sealing spacer ring (5) and the transition piston ring (3) are removed, the upper shell of the valve is removed, and the combined seal is replaced.
2. A valve leak control method for a gas well wellhead as claimed in claim 1, wherein: the sealing spacer ring (5) is in threaded connection with the middle annular table surface of the transition piston ring (3), and a sealing ring (8) is arranged between the sealing spacer ring (5) and the middle annular table surface of the transition piston ring (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911170335.7A CN110905445B (en) | 2019-11-26 | 2019-11-26 | Valve leakage controller and method for wellhead of gas well |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911170335.7A CN110905445B (en) | 2019-11-26 | 2019-11-26 | Valve leakage controller and method for wellhead of gas well |
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| CN110905445A CN110905445A (en) | 2020-03-24 |
| CN110905445B true CN110905445B (en) | 2024-03-29 |
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Effective date of registration: 20201029 Address after: 100007 Dongcheng District, Dongzhimen, China, North Street, No. 9 Oil Mansion, No. Applicant after: CHINA NATIONAL PETROLEUM Corp. Applicant after: CNPC CHUANQING DRILLING ENGINEERING Co.,Ltd. Address before: 710018 Shaanxi province Xi'an Weiyang Changqing Changqing prosperous Park District Building Room 1207 Applicant before: CHINA NATIONAL PETROLEUM CORPORATION CHUANQING DRILLING ENGINEERING COMPANY LIMITED CHANGQING DOWNHOLE TECHNOLOGY Co. Applicant before: CHINA NATIONAL PETROLEUM Corp. Applicant before: CNPC CHUANQING DRILLING ENGINEERING Co.,Ltd. |
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