CN113294117B - Full-time leakage and prevention dual-purpose device for pumping well - Google Patents
Full-time leakage and prevention dual-purpose device for pumping well Download PDFInfo
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- CN113294117B CN113294117B CN202110238789.4A CN202110238789A CN113294117B CN 113294117 B CN113294117 B CN 113294117B CN 202110238789 A CN202110238789 A CN 202110238789A CN 113294117 B CN113294117 B CN 113294117B
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- 230000002265 prevention Effects 0.000 title claims abstract description 52
- 238000005086 pumping Methods 0.000 title claims abstract description 23
- 239000007788 liquid Substances 0.000 claims abstract description 54
- 238000004519 manufacturing process Methods 0.000 claims description 18
- 239000003129 oil well Substances 0.000 claims description 8
- 230000009471 action Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 23
- 238000007689 inspection Methods 0.000 abstract description 9
- 230000008569 process Effects 0.000 description 22
- 238000004873 anchoring Methods 0.000 description 7
- 230000007246 mechanism Effects 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 241000191291 Abies alba Species 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/06—Blow-out preventers, i.e. apparatus closing around a drill pipe, e.g. annular blow-out preventers
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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
- E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
- E21B23/01—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells for anchoring the tools or the like
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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
- E21B34/14—Valve arrangements for boreholes or wells in wells operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools
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- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Reciprocating Pumps (AREA)
Abstract
A full-time leakage and prevention dual-purpose device for a pumping well. The main problem of solving current blowout prevention and draining device and can only play a role in single period. The method is characterized in that: a valve body (5) is arranged outside the central tube (1), a fold-line-shaped track groove (12) is formed in the outer surface of the upper portion of the central tube (1), a track nail (4) is arranged in the track groove (12), the track nail (4) is connected to the valve body (5), and a valve body liquid through hole (17) is formed in the side wall of the valve body (5) corresponding to the lower outer tube (7); an upper liquid through hole (13) and a lower liquid through hole (16) are formed in the central pipe (1), and a check valve (6) connected with one of the liquid through holes is arranged on the valve body (5); and a spring (9) is arranged between the bottom end of the central tube (1) and an inner boss (10) of the lower outer barrel (7). The oil pumping well full-time blowout prevention dual-purpose device not only has blowout prevention and oil drainage functions at the same time, but also can realize blowout prevention and oil drainage in the full time of pump inspection operation.
Description
Technical Field
The invention relates to the field of oil fields, in particular to a full-time leakage and prevention dual-purpose device for an oil pumping well.
Background
In the process of pulling out and putting down the rod pipe during the operation of detecting and putting down the pump, the pumping unit well can spray liquid from the inside of the oil pipe to the ground for a well with high underground pressure. Although the liquid cannot be sprayed upwards in a well with low underground pressure, the fixed valve of the pump is closed in the pipe string lifting process, the well liquid in the oil pipe can be brought to the ground along with the lifting of the oil pipe when the pipe string is lifted, the environment is polluted, the labor condition of operation workers is worsened, the operation workers at the wellhead operate in oil stains, the well site needs to be cleaned after the construction is finished, and a lot of workload is increased. Therefore, the blowout prevention and oil drainage during the oil well tripping operation are important contents to be solved for the environmental protection of the oil field. Various explorations are made for people, various blowout prevention and oil drainage processes are formed, but the processes are not perfect and have various problems:
the blowout prevention process comprises the following steps: a blowout prevention disconnecting device with a plugging mechanism is additionally arranged in a large pump disconnecting link, and an oil pipe on a pump is plugged before and after a rod column is in butt joint with a plunger piston, so that blowout is prevented when the rod column is pulled down. If the pressure in the well is low and no spraying potential exists during pump inspection, the oil pipe is blocked and oil cannot be drained. And the process can only be applied to large pump wells with the diameter of phi 83 or more, but can not be applied to small pumps with the pump diameters of phi 70 or less, and the small pumps do not need disconnectors. And before the pole column is butted, a pump truck is used for pumping liquid into the pole column, and the butted pole column can be opened and plugged after the hydraulic pressure is leveled off.
The blowout prevention process of applying the valve on the pump can only prevent blowout when a pipe string is lowered, and cannot prevent blowout when the pipe string is raised. Before the valve is opened, a pump truck and a tank truck are needed to fill the oil pipe with water to balance pressure.
The blowout prevention process for adding the movable plug under the fixed valve by using the oil well pump can only realize blowout prevention when a pipe string is put down, cannot realize blowout prevention when the pipe string is lifted, and can carry out oil pumping production only by using a pump truck and a tank truck to pump hydraulic pressure into an oil pipe to hold the movable plug down after the pipe string is put down.
The blowout prevention of the oil pipe anchor can be realized only when the oil pipe string is pulled out, and the oil pipe anchor cannot be put into production directly due to the fact that an oil way is blocked if setting of the oil pipe anchor fails after the oil pipe string is pulled out, so that the oil pipe string can be pulled out and lowered again.
The self-expansion plug throwing device is thrown into an oil pipe for blowout prevention, cannot be applied when a pipe string is lowered, and can only be used for throwing the plug under the condition of emptying the oil pipe after a sucker rod is pulled out, the plug is required to be expanded for 4 to 6 hours after throwing and plugging, the construction progress is influenced, and the plug can not be thrown in place when resistance such as thick wax deposition exists on the pipe wall.
Because the above-mentioned every blowout-preventing process can not solve the blowout prevention when the sucker rod string is lifted, the sucker rod also must be self-sealed at well mouth, i.e. when the sucker rod string is lifted, the sucker rod made of rubber can be self-sealed and fixed on the well control device, and the sucker rod string can be passed through the well control device. However, the diameter of the coupling of the rod string is too large than the rod body, the self-sealing expansion ratio is too large, and the self-sealing expansion ratio exceeds the range of the conventional rubber, so that the self-sealing service life of the sucker rod is too short, and particularly, in recent years, a large number of centralizers are additionally arranged on the rod string to solve the problem of eccentric wear of the rod pipe, the outer diameter of the centralizers is larger than that of the coupling of the rod string, and the outer surface of the centralizers is provided with a plurality of straight edges or spiral edges, so that blowout prevention is more difficult when the rod string is pulled up.
And (3) oil drainage process: the earliest oil drain device is a blind hole screw plug type oil drain device which is connected between a pump barrel and a fixed valve, after a rod column is lifted during operation and pump inspection, a rod is thrown into an oil pipe, the blind end of a screw plug extending into the pipe is broken, a central hole of the screw plug is exposed, and well fluid in the pipe column flows out.
The other is a sliding sleeve type oil drain device connected on the fixed valve, which also puts a rod into the oil pipe after the rod column is lifted, breaks the shear nails of the fixed sliding sleeve to enable the sliding sleeve to fall down to expose an oil drain hole, so as to drain oil when the pipe column is lifted.
And thirdly, a pressurizing type sliding sleeve oil drain device connected to the pipe column on the pump is used for pumping high pressure into the oil pipe by using a pump truck before the pipe column is lifted, and the sliding sleeve is opened to expose an oil drain hole for draining oil.
And fourthly, the pull-type oil drain device needs two underground tools to be combined for use, and besides the oil drain device which is arranged on the pipe column and is pulled to break the shear pin by the pulling force to expose the oil drain hole, the lower part of the pull-type oil drain device also needs to be matched and connected with an oil pipe anchor for anchoring the pipe column, so that enough pulling force is generated to pull the shear pin to break when the pipe column is lifted. The anchoring and oil drainage can also be made into a downhole tool, which can be called as an oil drainage anchor, connected to a pipe column on the pump, and the oil drainage mechanism on the upper part pulls out the oil drainage when the pipe column is lifted by the anchoring force of the anchoring assembly.
And fifthly, a branch well bottom type oil drain device is connected below the pump, a deepened pipe column is firstly put down before the pipe column is lifted, the pipe column is branched to the well bottom, a central rod of the oil drain device is used for supporting and positioning a fixed valve ball of the pump, and oil drainage of a liquid flow channel is formed.
In summary, the existing blowout prevention and oil drainage processes have various defects and problems: the blowout prevention process can only realize single-pass blowout prevention in the process of lifting and lowering the pipe column, or can realize double-pass blowout prevention of the lifting and lowering pipe column but cannot realize blowout prevention when the rod column is lifted. Some processes also need to call the cooperation of a pump truck and a tank truck, which is troublesome. Drainage downhole tools also suffer from various drawbacks and problems: the rod throwing type oil drain device can throw a rod after the rod column is lifted, and cannot throw the rod due to the fact that the rod column below a breaking point is left in an oil pipe under the condition that a pump is detected due to breakage and falling of the rod column in the well; the oil drain device opened by pressure holding is not pressed to high pressure under the condition that the oil well detects the pump due to leakage, the oil drain device cannot be opened, and the operation is troublesome due to the need of loading a tank car and a pump truck; the oil drain device opened by pulling needs to be additionally provided with an anchoring tool or an anchoring mechanism, so that the cost is high, the operation is troublesome, and the risk that the oil drain device is pushed out when the pump condition is diagnosed due to pressure holding during production or the anchoring mechanism is blocked when a pipe column is lifted exists; the oil drainage process by the branch well bottom operation of the pipe column increases the extra workload of pulling and transporting the lengthened oil pipe to the well site and the operation workload of lowering the deepened pipe column because the pipe column needs to be deepened.
The blowout prevention and oil drainage are contradictory, the blowout prevention requires that a pipe column is closed to prevent well liquid from entering an oil pipe, and the oil drainage requires that a liquid flow channel is opened at the bottom of the pipe column when the pipe column is lifted up to enable the well liquid in the oil pipe to flow out of the oil pipe, so that the functions of the conventional blowout prevention and oil drainage downhole tool are single, or the blowout prevention or the oil drainage is realized, and the downhole tool can not be used for one purpose or two purposes. However, because the pressure in the well is dynamic, the pressure in the well bore is low during oil pumping production, when the pump fails and stops production, the pressure in the well bore rises, for example, the production stop time is long, the pressure in the well bore gradually approaches the formation pressure, for example, the formation pressure is higher than the hydrostatic column pressure, at the moment, the oil well has the blowout potential, and blowout prevention is needed during pump detection operation. If the formation pressure is low or the operation time of the pump is short before the production is stopped, and the well has no spraying potential during the operation of the pump, the oil drainage is carried out during the operation of the pump. However, the downhole tool for blowout prevention and oil drainage is connected to a pipe column to be used for going down a well when the downhole tool needs to be used for pump inspection, and the time for which the pump fails and stops production can be discharged to an operation team to be used for pump inspection operation, so that blowout prevention or oil drainage is performed at the moment.
In the existing documents, the switching between the blowout prevention and oil drainage functions by the pressure difference between the inside and the outside of the pipe is also proposed, but the switching between the production and the leakage prevention state still depends on throwing the rod after the sucker rod is taken out, so that the process can only play a role in part of the process of pump inspection operation, and the following problems exist: firstly, because throw stick and close the production passageway can only go on after rising out the post, because of the production passageway is open in the pole process of rising, still can the hydrojet in this operation time quantum. And secondly, a plurality of well times of pump detection operations are carried out due to the fact that the rod column is broken and separated, the rod column below the break point is left in the oil pipe and cannot be lifted out along with the upper rod column, under the condition, the rod cannot be thrown to close the production channel before the pipe column is lifted, and blowout prevention and oil drainage cannot be achieved during the pipe column lifting. Therefore, the blowout-preventing oil drainage device with full functions and full time needs to be developed, so that the problems of the various processes are solved.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a full-time leakage and oil prevention dual-purpose device for a pumping well.
The technical scheme of the invention is as follows: a pumping well whole-time leakage and prevention dual-purpose device comprises a central tube, an upper outer tube and a lower outer tube, wherein a valve body is arranged outside the central tube, the upper outer tube and the lower outer tube are respectively connected to the upper end and the lower end of the valve body, a fold-line-shaped track groove is formed in the outer surface of the upper portion of the central tube, a track nail is arranged in the track groove and connected to the valve body, and a valve body liquid through hole is formed in the side wall of the valve body, corresponding to the lower outer tube; the central pipe is provided with an upper liquid through hole and a lower liquid through hole, and the valve body is provided with a check valve connected with one of the liquid through holes; and a spring is arranged between the bottom end of the central tube and the inner boss of the lower outer barrel.
The track groove comprises a plurality of vertical longitudinal grooves and inclined chutes in the vertical direction, the number of the longitudinal grooves and the number of the inclined chutes are even, the inclined chutes and the longitudinal grooves are arranged at intervals in the circumferential direction, and the inclined chutes are positioned at the upper part of the longitudinal grooves; the longitudinal groove is divided into a long groove and a short groove which are arranged at intervals.
And the side wall of the upper part of the central tube is provided with a plurality of liquid outlet holes.
The outer part of the track nail is in threaded connection with a rotating ring, and the rotating ring is positioned on a ring groove in the inner wall of the valve body.
The lower end of the central pipe is connected with a spring seat, and the upper end of the spring is propped against the spring seat.
The invention has the following beneficial effects: by adopting the scheme, the production state and the leakage state of the device are changed alternately, the circumferential communication of the tracks can be performed circularly, the leakage state and the production state can be switched once only by once lowering and lifting the rod column, and the two times of lowering and lifting of the rod column are necessary operations in the process of pump detection operation, and the operation is not specially added for changing the state of the device. In the leakage and prevention state, oil drainage or blowout prevention is performed, and the check valve is naturally formed according to the pressure difference between the inside and the outside of the pipe, so that the oil well can adapt to different oil well conditions. Therefore, the problems of blowout prevention and oil drainage in the oil pipe in the whole process of pump operation can be satisfactorily solved. The device not only solves the problem that the functions of blowout prevention and oil drainage are simultaneously combined, but also can realize blowout prevention and oil drainage in the whole time period in each process of pump inspection operation, and can play a role in leakage prevention even if the rod column breaks and is detached to inspect the pump.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is an expanded view of the track groove.
In the figure, 1 represents a central tube, 2 represents an upper outer barrel, 3 represents a swivel, 4 represents a track nail, 5 represents a valve body, 6 represents a check valve, 7 represents a lower outer barrel, 8 represents a spring seat, 9 represents a spring, 10 represents an inner boss, 11 represents a liquid outlet, 12 represents a track groove, 13 represents an upper liquid through hole, 14 represents an outer barrel liquid through hole, 15 represents a flow channel, 16 represents a lower liquid through hole, 17 represents a valve body liquid through hole, and 18 represents a step.
Detailed Description
The invention will be further described with reference to the accompanying drawings in which:
as shown in figures 1 and 2, the oil pumping well full-time leakage and prevention dual-purpose device comprises a central tube 1, an upper outer tube 2 and a lower outer tube 7, wherein a valve body 5 is arranged outside the central tube 1, a plurality of sealing rings are arranged between the valve body 5 and the central tube 1 and can rotate mutually, and the upper outer tube 2 and the lower outer tube 7 are respectively connected to the outer sides of the upper end and the lower end of the valve body 5 through threads. A plurality of liquid outlet holes 11 are formed in the side wall of the upper portion of the central tube 1, and a protruding step 18 is arranged on the outer wall of the upper portion of the central tube 1. The outer surface on center tube 1 upper portion is opened there is broken line shape track groove 12, track groove 12 includes the chute of indulging of a plurality of vertical direction and the chute of slope, indulges the quantity of groove and chute and is the even number, and the chute sets up with indulging the groove interval in circumference, and the chute is located indulging groove upper portion, and all links to each other through the transition groove that the degree of depth is the same between two adjacent grooves. The longitudinal grooves are divided into long grooves and short grooves which are arranged at intervals, namely the inclined grooves are positioned between one long groove and one short groove in the vertical direction.
When in work, the device is connected between a fixed valve of an oil well pump and a pump cylinder and is used for going into a well. The device is in the initial state (as shown in figure 1), the track spike 4 is at the position I in figure 2, namely the lower end of the long groove, the upper liquid through hole 13 of the central pipe 1 is in the blocked state, the lower liquid through hole 16 is communicated with the check valve 6 in the liquid flow channel 15, and the check valve 6 is in the closed state to play a blowout prevention role because the pressure in the shaft is higher than the pressure in the oil pipe. After the pipe column is put down, the rod column is put down, and then the rod column is pressed on the central pipe 1, so that the compression spring 9 of the central pipe 1 moves downwards to a bottom dead center, namely a step 18 at the upper end of the central pipe 1 leans against the upper end surface of the valve body 5, at the moment, the upper liquid through hole 13 of the central pipe 1 moves to a state corresponding to the flow channel 15 at the check valve 6, the lower liquid through hole 16 crosses the valve body liquid through hole 17 on the valve body 5, and is in a blocked state, and the track nail 4 is positioned at the top dead center of the track groove 12, namely a position II shown in fig. 2. When the oil pumping rod string is lifted and fixed by the upper lifting and impact preventing distance, the central tube 1 goes upward under the action of the spring 9 due to the loss of the weight of the rod string, the rail nail 4 enters the lower end point of the short groove of the rail groove 12, namely, the position III shown in figure 2, the central tube 1 cannot move upward under the restriction of the rail nail 4, at the moment, the lower liquid through hole 16 of the central tube 1 corresponds to the valve body liquid through hole 17 of the valve body 5, the liquid flow channel 15 of the check valve 6 is blocked, at the moment, the device enters the state during oil pumping production, well liquid entering from the lower end of the lower outer tube 7 goes upward through the spiral space of the spring 9 and the peripheral annular space of the spring seat 8 along with the reciprocating motion of the pump plunger, then enters the central tube 1 through the valve body liquid through hole 17 on the valve body 5 and the lower liquid through hole 16 on the central tube 1, and then flows out from the upper end of the liquid outlet hole 11 on the central tube 1.
When the pump is checked next time, after the clamp at the side of the sucker rod is removed from the well mouth, the weight of the rod string is pressed on the central tube 1 again, so that the central tube 1 descends to the bottom dead center, the track nail 4 reaches the position IV in the figure 2, the lower liquid through hole 16 of the central tube 1 is blocked, the upper liquid through hole 13 corresponds to the flow channel 15 at the check valve 6, the Christmas tree can be detached after entering a leakage prevention state, and then the sucker rod string is lifted. When the sucker rod string is lifted, the central tube 1 is lifted to the top dead center under the action of the spring 9, the rail nail 4 enters the position V in the figure 2, and the central tube 1 is in the initial installation state again, so that the sucker rod string can be prevented from being blown up. And after the rod string is lifted, the string is prevented from being lifted in the state, and when the string is lifted, if the pressure in the shaft is lower than the pressure in the oil pipe, the check valve is automatically opened to realize oil drainage.
If the well is used for pump inspection operation due to the fact that the sucker rod string breaks off, the lower rod string below the breaking point is pressed on the central tube 1, the lower liquid through hole 16 in the central tube 1 is blocked as described above, the device is changed from a production state to a leakage prevention state, the device is also operated as described above during pump inspection operation, and the sucker rod string can be lifted up normally after being put down.
In summary, when the rail nail is at the position corresponding to a (i.e. the central tube 1 is at the bottom dead center) and the position corresponding to C (i.e. the central tube 1 is at the top dead center) shown in fig. 2, the device is in a leakage-proof state. When the rail nail is in the position corresponding to B shown in fig. 2 (i.e., the central tube is at the middle position of the top dead center and the bottom dead center), the device is in a longitudinally communicated production state.
Claims (4)
1. The utility model provides a dual-purpose device is prevented leaking by pumping well whole period, includes center tube (1), goes up urceolus (2), urceolus (7) down, its characterized in that: a valve body (5) is arranged outside the central tube (1), the upper outer tube (2) and the lower outer tube (7) are respectively connected to the upper end and the lower end of the valve body (5), a fold-line-shaped track groove (12) is formed in the outer surface of the upper portion of the central tube (1), a track nail (4) is arranged in the track groove (12), the track nail (4) is connected to the valve body (5), and a valve body liquid through hole (17) is formed in the side wall of the valve body (5) corresponding to the lower outer tube (7); an upper liquid through hole (13) and a lower liquid through hole (16) are formed in the central pipe (1), and a check valve (6) connected with one of the liquid through holes is arranged on the valve body (5); a spring (9) is arranged between the bottom end of the central tube (1) and an inner boss (10) of the lower outer barrel (7);
the track groove (12) comprises a plurality of vertical longitudinal grooves and inclined chutes, the number of the longitudinal grooves and the number of the inclined chutes are even, the inclined chutes and the longitudinal grooves are arranged at intervals in the circumferential direction, and the inclined chutes are positioned at the upper parts of the longitudinal grooves; the longitudinal groove is divided into a long groove and a short groove which are arranged at intervals;
when the oil pumping well full-time leakage and prevention dual-purpose device works, the oil pumping well full-time leakage and prevention dual-purpose device is connected between a fixed valve of an oil well pump and a pump barrel and is put into a well, when the oil pumping well full-time leakage and prevention dual-purpose device works, in an initial state, a track nail (4) is positioned at the lower end of a long groove, an upper liquid through hole (13) is in a blocked state, a lower liquid through hole (16) is communicated with a check valve (6), and the check valve (6) is in a closed state to play a role in blowout prevention;
after the pipe column is completely lowered, the pipe column is pressed on a central pipe (1) after the pipe column is completely lowered, the central pipe (1) compresses a spring (9) to move downwards to a bottom dead center, an upper liquid through hole (13) corresponds to a flow channel (15) at a check valve (6), a lower liquid through hole (16) is in a blocked state, a track nail (4) is at the top dead center of a track groove (12), when the oil pumping rod column is lifted and fixed by an upper lifting and preventing impact distance, the central pipe (1) moves upwards under the action of the spring (9) due to the loss of the weight of the pipe column, the track nail (4) enters a short groove lower end point of the track groove (12), the lower liquid through hole (16) corresponds to a valve body liquid through hole (17), the flow channel (15) of the check valve (6) is blocked, and then the device enters a state during oil pumping production;
and (3) after the rod string is started, the string is started, and when the string is started, if the pressure in the shaft is lower than the pressure in the oil pipe, the check valve (6) is automatically opened to realize oil drainage.
2. The dual-purpose device for full-time leakage and prevention of pumping well according to claim 1, characterized in that: the side wall of the upper part of the central tube (1) is provided with a plurality of liquid outlet holes (11).
3. The device for preventing and controlling the full time leakage of the pumping well according to claim 2, wherein: the track spike (4) is connected with the rotating ring (3) through external threads, and the rotating ring (3) is positioned on the annular groove in the inner wall of the valve body (5).
4. The device of claim 3, wherein the device comprises: the lower end of the central tube (1) is connected with a spring seat (8), and the upper end of the spring (9) is pressed against the spring seat (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110238789.4A CN113294117B (en) | 2021-05-10 | 2021-05-10 | Full-time leakage and prevention dual-purpose device for pumping well |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110238789.4A CN113294117B (en) | 2021-05-10 | 2021-05-10 | Full-time leakage and prevention dual-purpose device for pumping well |
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| CN113294117A CN113294117A (en) | 2021-08-24 |
| CN113294117B true CN113294117B (en) | 2022-12-30 |
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| CN2232975Y (en) * | 1995-05-24 | 1996-08-14 | 玉环县石油机械厂 | Well hydraulic programme controller |
| GB0106538D0 (en) * | 2001-03-15 | 2001-05-02 | Andergauge Ltd | Downhole tool |
| CN2591223Y (en) * | 2002-12-17 | 2003-12-10 | 大庆石油管理局 | Contact switch |
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