CN220133932U - Special underground reverse circulation well flushing valve for cable casting and fishing rodless oil extraction - Google Patents
Special underground reverse circulation well flushing valve for cable casting and fishing rodless oil extraction Download PDFInfo
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- CN220133932U CN220133932U CN202322932814.6U CN202322932814U CN220133932U CN 220133932 U CN220133932 U CN 220133932U CN 202322932814 U CN202322932814 U CN 202322932814U CN 220133932 U CN220133932 U CN 220133932U
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- piston
- cylinder sleeve
- well flushing
- lining pipe
- reverse circulation
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- 238000011010 flushing procedure Methods 0.000 title claims abstract description 64
- 238000000605 extraction Methods 0.000 title claims abstract description 18
- 238000005266 casting Methods 0.000 title claims abstract description 14
- 239000007788 liquid Substances 0.000 claims abstract description 50
- 238000007789 sealing Methods 0.000 claims abstract description 24
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 238000011084 recovery Methods 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 230000007797 corrosion Effects 0.000 abstract description 4
- 238000005260 corrosion Methods 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 241000612118 Samolus valerandi Species 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
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Abstract
The technology relates to the technical field of oil extraction equipment, in particular to a cable casting and fishing underground reverse circulation well flushing valve special for rodless oil extraction. Comprising the following steps: the device comprises a lower joint, an upper joint, a cylinder sleeve and a lining pipe, wherein two ends of the cylinder sleeve are respectively in threaded connection with the upper joint and the lower joint, the lining pipe is arranged at one end of the cylinder sleeve close to the upper joint, the lining pipe is in sliding connection with the cylinder sleeve, a sliding space is arranged between the lining pipe and the cylinder sleeve, a spring is arranged in the sliding space and sleeved on the lining pipe, a piston is in sliding connection with the cylinder sleeve which is abutted to one end of the lower joint, a liquid passing hole of the piston and a liquid passing hole of the cylinder sleeve are staggered to form a closed state, and a well flushing liquid passage is formed by overlapping the liquid passing hole of the cylinder sleeve, the liquid passing hole of the piston and the liquid passing hole of the lining pipe; and the two ends of the piston are provided with wear-resistant sealing elements for filling gaps between the cylinder sleeve and the piston. Solves the problems of sealing failure, corrosion resistance, sha Ka and the like of the original reverse circulation well flushing valve.
Description
Technical Field
The technology relates to the technical field of oil extraction equipment, in particular to a cable casting and fishing underground reverse circulation well flushing valve special for rodless oil extraction.
Background
In the normal production process of cable casting and fishing rodless oil extraction, well flushing operation can be carried out according to well conditions, and various well flushing valves are developed for facilitating the well flushing operation. Currently, well cleanup operations are basically performed by means of reverse circulation well cleanup valves installed downhole; injecting well flushing liquid through a casing annulus, and opening a reverse circulation well flushing valve after the oil pipe casing is continuously pressurized at a wellhead to achieve a certain pressure difference, wherein the well flushing liquid enters an oil pipe through the reverse circulation well flushing valve, so that the purpose of well flushing is achieved; and after the well flushing is finished, the reverse circulation well flushing valve is closed through well hydraulic pressure in the oil pipe or oil pipe pressing, so that the whole well flushing operation is completed.
The utility model patent with the application number of CN201721886046.3 discloses a backwash well circulating valve. The novel pipe comprises a pipe body, wherein an inner liner pipe is arranged inside the pipe body, a second annular groove is arranged below a first annular groove, a piston is arranged in the second annular groove, a third annular groove is arranged on the outer edge of the piston, a sealing ring is arranged in the third annular groove, the inner edge of the piston is slidably connected with the outer edge of the inner liner pipe, a spring is sleeved on the inner liner pipe between the piston and the upper groove bottom of the first annular groove, a V-shaped sealing ring is arranged in a fourth annular groove, a baffle ring is in threaded connection with the outer edge of the piston below the inner liner pipe, a lower joint is arranged at the lower end of the pipe body, the outer edge of the V-shaped sealing ring is slidably and hermetically connected with the inner edge of the upper part of the lower joint, a conical surface with the lower end folded towards the inner edge of the piston is arranged on the outer edge of the piston, and a plurality of slots corresponding to the conical surface are uniformly distributed on the pipe body. The utility model has low manufacturing cost, quick response, easy maintenance and good sealing effect, and can prevent gas from entering the circulating valve in the oil extraction process.
The sealing ring in the technology is easy to damage in the use process, and because the sealing between the pistons of the existing reverse circulation well flushing valve cylinder sleeve is sealed by a nitrile-O-shaped ring, the shearing damage phenomenon occurs in the repeated well flushing process, so that the sealing of the backwash valve is invalid, and meanwhile, the contact surface of the cylinder sleeve and the piston is easy to corrode, so that the sealing is invalid, and the normal production is possibly seriously impossible; in sand wells, the piston is easily stuck by gravel and cannot be opened or closed due to the large gaps between the cylinder sleeve and the piston and between the piston and the lining pipe.
Disclosure of Invention
The utility model provides a downhole reverse circulation well flushing valve special for cable casting and fishing rodless oil extraction, which can solve the problems of sealing failure, corrosion resistance and sand blocking of the reverse circulation well flushing valve.
In order to solve the technical problems, the utility model provides the following technical scheme:
a downhole reverse circulation well flushing valve special for cable casting rodless oil recovery, comprising: the inner lining pipe is arranged at one end of the cylinder sleeve close to the upper joint, the inner lining pipe is in sliding connection with the cylinder sleeve, a sliding space is arranged between the inner lining pipe and the cylinder sleeve, a spring is arranged in the sliding space and sleeved on the inner lining pipe, a piston is in sliding connection with the cylinder sleeve which is abutted to one end of the lower joint, the inner edge of the piston is in sliding connection with the outer edge of the inner lining pipe, the outer edge of the piston is in sliding connection with the inner edge of the cylinder sleeve, the upper part of the piston is fixedly connected with one end of the spring, and the other end of the spring is fixed in the sliding space; the well flushing liquid enters the lower part of the reverse circulation well flushing valve piston through the control holes during well flushing, so that the liquid passing hole of the cylinder sleeve, the liquid passing hole of the piston and the liquid passing hole of the lining pipe are overlapped to form a well flushing liquid channel; and the two ends of the piston are respectively provided with a wear-resistant sealing piece used for filling a gap between the cylinder sleeve and the piston, and the gaps between the cylinder sleeve and the piston and between the piston and the lining pipe are equal to 0.1mm.
The basic principle and the beneficial effects of the scheme are that: the lower joint is connected with the pump outlet in a threaded connection mode, and an overflow channel is arranged in the lower joint, namely an oil gas passage during oil extraction. The cylinder sleeve is an external support joint and is connected with the upper joint and the lower joint in a threaded mode, a plurality of control holes and liquid passing holes are formed in the cylinder sleeve, the control holes are opened in an oil extraction state, and the liquid passing holes are closed. The piston is a key component for opening and closing the liquid through holes, a plurality of liquid through holes corresponding to the cylinder sleeve are arranged, the liquid through holes and the cylinder sleeve liquid through holes are staggered to form a closed state during oil extraction, the liquid through holes of the cylinder sleeve, the liquid through holes of the piston and the liquid through holes of the lining pipe are overlapped to form a well flushing liquid channel during well flushing, the wear-resistant sealing pieces are arranged at the two ends of the piston, the wear-resistant sealing pieces at the two ends generate recoverable deformation under the action of external well flushing liquid during well flushing, the wear-resistant sealing pieces at the two ends prevent the well flushing liquid from entering in the initial state, the lower well flushing liquid pressure is continuously increased and is larger than the spring pressure, the wear-resistant sealing pieces at the action of the external well flushing liquid generate recoverable deformation, the well flushing liquid can pass through the piston until the liquid through holes of the cylinder sleeve, the piston and the liquid through holes of the lining pipe are overlapped to form a reverse circulation channel of the well flushing. Solves the problems of sealing failure, corrosion resistance, sha Ka and the like of the reverse circulation well flushing valve.
The wear-resistant sealing parts are positioned at two ends of the piston and mainly fill the gap between the cylinder sleeve and the piston, an overflow channel, namely an oil gas channel during oil extraction, is arranged in the liner tube, the outer wall of the liner tube is provided with a plurality of liquid passing holes corresponding to the liquid passing holes on the cylinder sleeve, and when the well is washed, well washing liquid finally enters the oil tube through the holes; the upper joint is connected with the oil pipe and the reverse circulation well flushing valve in a threaded mode, and well flushing liquid enters an oil gas channel during normal oil extraction during well flushing.
Further, the wear seal is a gurley ring.
The beneficial effects are that: the gray ring is adopted as the wear-resistant sealing piece, so that the sealing effect can be well achieved, and meanwhile, the service life of the reverse circulation well flushing valve is prolonged due to the remarkable improvement of wear resistance;
further, one end of the spring, which is close to the upper joint, is also provided with an adjusting bolt for adjusting the maximum stroke of the spring.
The beneficial effects are that: the pressure regulator is composed of an adjusting bolt and a spring: the pressure of the valve can be set according to the field requirement through the spring and the adjusting bolt at the upper part, and after well flushing is finished, the internal and external pressure difference disappears and then the valve is restored to the closed state.
The beneficial effects are that: gaps between the piston and the cylinder sleeve and between the piston and the lining pipe are equal to 0.1mm, so that the sand-gravel clamp can be effectively prevented from falling into the sand-gravel clamp.
Further, the material of the well flushing valve is 316L steel.
Further, a Gelai ring is arranged at the upper part of the piston, and two Gelai rings are arranged at the lower part of the piston.
Drawings
FIG. 1 is a front view of an embodiment of a downhole reverse circulation flushing valve dedicated to rodless oil recovery with cable casting;
FIG. 2 is a cross-sectional view of one embodiment of a downhole reverse circulation flushing valve dedicated to rodless oil recovery with cable casting.
Detailed Description
The following is a further detailed description of the embodiments:
the labels in the drawings of this specification include: the hydraulic cylinder comprises a lower joint 1, a cylinder sleeve 2, a piston 3, a wear-resistant sealing element 4, a spring 5, a lining pipe 6, an upper joint 7, a control hole 81 and a liquid passing hole 82.
Example one is shown in figures 1-2,
a downhole reverse circulation well flushing valve special for cable casting rodless oil recovery, comprising: the novel high-pressure oil cylinder comprises a lower joint 1, an upper joint 7, a cylinder sleeve 2 and a lining pipe 6, wherein two ends of the cylinder sleeve 2 are respectively in threaded connection with the upper joint 7 and the lower joint 1, the lining pipe 6 is arranged at one end, close to the upper joint 7, of the cylinder sleeve 2, the upper joint 7 and the lower joint 1 are in threaded connection with the lining pipe 6, the lining pipe 6 is in sliding connection with the cylinder sleeve 2, a sliding space is arranged between the lining pipe 6 and the cylinder sleeve 2, a spring 5 is arranged in the sliding space, the spring 5 is sleeved on the lining pipe 6, a piston 3 is in sliding connection with the cylinder sleeve 2, close to one end of the lower joint 1, the inner edge of the piston 3 is in sliding connection with the outer edge of the lining pipe 6, the outer edge of the piston 3 is in sliding connection with the inner edge of the cylinder sleeve 2, the upper part of the piston 3 is fixedly connected with one end of the spring 5, and the other end of the spring 5 is fixedly arranged in the sliding space; the cylinder sleeve 2, the piston 3 and the lining pipe 6 are provided with matched liquid passing holes 82, when oil is extracted, the liquid passing holes 82 of the piston 3 and the liquid passing holes 82 of the cylinder sleeve 2 are staggered to form a closed state, and when a well is washed, the liquid passing holes 82 of the cylinder sleeve 2, the liquid passing holes of the piston 3 and the liquid passing holes 82 of the lining pipe 6 are overlapped to form a well washing liquid channel; and the two ends of the piston 3 are respectively provided with a wear-resistant sealing piece 4 used for filling a gap between the cylinder sleeve 2 and the piston 3. The wear-resistant seal 4 is a glean ring. The upper part of the piston 3 is provided with a Gelai ring, and the lower part of the piston 3 is provided with two Gelai rings.
The end of the spring 5 close to the upper joint 7 is also provided with an adjusting bolt for adjusting the maximum stroke of the spring 5. The adjusting bolt and the spring 5 form a pressure regulator: the pressure of the valve can be set according to the field requirement through the spring 5 and the adjusting bolt at the upper part, and after well flushing is finished, the internal and external pressure difference disappears and then the valve is restored to the closed state.
The gap between the cylinder sleeve 2 and the piston 3, and the gap between the piston 3 and the lining pipe 6 is equal to 0.1mm. The material of the well flushing valve is 316L steel.
According to the scheme, gaps of all moving parts are redesigned, so that the sand card condition is reduced; the high wear-resistant Gelai ring is used for replacing the original Bunge seal ring, so that the service life is prolonged; from the aspect of the material, the 316L steel is used for replacing 45# steel, so that the corrosion resistance is improved, and the normal operation of equipment is ensured, thereby reducing the well repair operation caused by the failure of the reverse circulation well flushing valve.
The specific implementation process of the scheme is as follows: during well flushing, the through hole 82 of the cylinder sleeve 2, the through hole 82 of the piston 3 and the through hole 82 of the lining pipe 6 are overlapped to form a well flushing liquid channel, well flushing liquid enters the lower part of the reverse circulation well flushing valve piston 3 through the control hole 81, as the well flushing liquid pressure continuously rises, the pressure difference between the inside and the outside of the piston 3 gradually increases, the piston 3 slowly ascends, the spring 5 compresses until the through hole 82 of the cylinder sleeve 2 is opened, the pressure difference between the inside and the outside reaches an equilibrium state, so that the through hole 82 of the cylinder sleeve 2 is kept in an open state, when well flushing is finished, the pressure difference between the inside and the outside of the piston 3 is reduced, elastic deformation is recovered at the spring 5, and the piston 3 is pushed to descend, so that a closed state is formed.
The foregoing is merely an embodiment of the present utility model, the present utility model is not limited to the field of this embodiment, and the specific structures and features well known in the schemes are not described in any way herein, so that those skilled in the art will know all the prior art in the field before the application date or priority date of the present utility model, and will have the capability of applying the conventional experimental means before the date, and those skilled in the art may, in light of the present utility model, complete and implement the present scheme in combination with their own capabilities, and some typical known structures or known methods should not be an obstacle for those skilled in the art to practice the present utility model. It should be noted that modifications and improvements can be made by those skilled in the art without departing from the structure of the present utility model, and these should also be considered as the scope of the present utility model, which does not affect the effect of the implementation of the present utility model and the utility of the patent. The protection scope of the present utility model is subject to the content of the claims, and the description of the specific embodiments and the like in the specification can be used for explaining the content of the claims.
Claims (5)
1. The utility model provides a special underground reverse circulation well flushing valve of rodless oil recovery is thrown to cable, its characterized in that includes: the inner lining pipe is arranged at one end of the cylinder sleeve close to the upper joint, the inner lining pipe is in sliding connection with the cylinder sleeve, a sliding space is arranged between the inner lining pipe and the cylinder sleeve, a spring is arranged in the sliding space and sleeved on the inner lining pipe, a piston is in sliding connection with the cylinder sleeve which is abutted to one end of the lower joint, the inner edge of the piston is in sliding connection with the outer edge of the inner lining pipe, the outer edge of the piston is in sliding connection with the inner edge of the cylinder sleeve, the upper part of the piston is fixedly connected with one end of the spring, and the other end of the spring is fixed in the sliding space; the well flushing liquid enters the lower part of the reverse circulation well flushing valve piston through the control holes during well flushing, so that the liquid passing hole of the cylinder sleeve, the liquid passing hole of the piston and the liquid passing hole of the lining pipe are overlapped to form a well flushing liquid channel; and the two ends of the piston are respectively provided with a wear-resistant sealing piece used for filling a gap between the cylinder sleeve and the piston, and the gaps between the cylinder sleeve and the piston and between the piston and the lining pipe are equal to 0.1mm.
2. The underground reverse circulation well flushing valve special for cable casting rodless oil extraction of claim 1, wherein the valve is characterized by: the wear-resistant sealing element is a Gelai ring.
3. The underground reverse circulation well flushing valve special for cable casting rodless oil extraction of claim 1, wherein the valve is characterized by: and one end of the spring, which is close to the upper joint, is also provided with an adjusting bolt for adjusting the maximum stroke of the spring.
4. The underground reverse circulation well flushing valve special for cable casting rodless oil extraction of claim 1, wherein the valve is characterized by: the material of the well flushing valve is 316L steel.
5. The underground reverse circulation well flushing valve special for cable casting rodless oil extraction of claim 2, wherein the valve is characterized in that: the upper part of the piston is provided with a Gelai ring, and the lower part of the piston is provided with two Gelai rings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322932814.6U CN220133932U (en) | 2023-10-31 | 2023-10-31 | Special underground reverse circulation well flushing valve for cable casting and fishing rodless oil extraction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322932814.6U CN220133932U (en) | 2023-10-31 | 2023-10-31 | Special underground reverse circulation well flushing valve for cable casting and fishing rodless oil extraction |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220133932U true CN220133932U (en) | 2023-12-05 |
Family
ID=88950703
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322932814.6U Active CN220133932U (en) | 2023-10-31 | 2023-10-31 | Special underground reverse circulation well flushing valve for cable casting and fishing rodless oil extraction |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220133932U (en) |
-
2023
- 2023-10-31 CN CN202322932814.6U patent/CN220133932U/en active Active
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