Oil well pump jam releasing system and working method thereof

Abstract

The invention belongs to the technical field of oil field oil production engineering, and relates to an oil well pump jam releasing system and a working method thereof. Comprising a pump truck which is communicated with an oil well and used for pumping the blocking remover into an oil pipe of the oil well. And the recovery tank is used for recovering the blocking remover in the blocking removal process. The fourth Christmas tree valve is used for controlling connection and disconnection between the oil well and the pump truck. The second Christmas tree valve is used for controlling connection and disconnection between the oil well and the recovery tank. The pump truck is connected with the thin oil tank and the blocking remover tank, thin oil in the thin oil tank and a blocking remover in the blocking remover tank are mixed and then injected into the oil pipe through the pump truck, a second valve is arranged between the thin oil tank and the pump truck and used for controlling connection and disconnection between the thin oil tank and the pump truck, and a third valve is arranged between the blocking remover tank and the pump truck and used for controlling connection and disconnection between the blocking remover tank and the pump truck. The third valve is used for controlling connection and disconnection between the blocking remover tank and the pump truck. The problem that an oil well pump is stuck or an oil pipe is blocked can be solved, the blocking removal effect is good, the cost is low, and the construction site is prevented from being occupied.

Description

Technical Field

[0001] The present invention belongs to the technical field of oilfield production engineering, and relates to a stuck-pump releasing system for a sucker rod pump and its working method. Background Art

[0002] During the development of sandstone oilfields, blockages often occur in oil and water wells, which is a common production phenomenon. Due to the different degrees of blockage, the impact on production is also different; with the extension of the waterflooding development time, sand production and scaling in oil wells, as well as various operations and measures implemented, have brought solid blockage substances to the formation. After these blockage substances enter the oil well, they cause frequent pump jams in the sucker rod pump, affecting oil production, and even leading to the scrapping of the sucker rod pump. Measures must be taken in a timely manner to reduce the impact of such events on oilfield development.

[0003] Pulling the tubing and checking the pump is the main measure to relieve such blocked pump jams, that is, pulling out the original well production string, dealing with the stuck pump, and then re-lowering the string. The entire process requires a large amount of operation costs and has several disadvantages:

[0004] 1. Long construction period, complex construction, and high cost;

[0005] 2. Occupying the construction site, there is a certain risk of environmental pollution;

[0006] 3. Affecting the normal production of oil wells and reducing production. Summary of the Invention

[0007] In order to overcome the above-mentioned disadvantages of the prior art, the purpose of the present invention is to provide a stuck-pump releasing system for a sucker rod pump and its working method. The present invention can relieve the stuck pump of the sucker rod pump or the blockage of the tubing, has a good blockage removal effect, low cost, and avoids occupying the construction site.

[0008] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0009] The present invention discloses a stuck-pump releasing system for a sucker rod pump, including a pump truck, the pump truck is connected to an oil well, the oil well is connected to a recovery tank, a sucker rod is arranged in the oil well, the sucker rod is connected to a tubing, a sucker rod pump is arranged in the tubing, a fourth production tree valve is provided between the oil well and the pump truck, a second production tree valve is provided between the oil well and the recovery tank, the pump truck is respectively connected to a dilution oil tank and a plugging agent tank, a second valve is provided between the dilution oil tank and the pump truck, and a third valve is provided between the plugging agent tank and the pump truck.

[0010] Further, the sucker rod is connected to a pumping unit.

[0011] Further, a blowout preventer box is provided on the sucker rod.

[0012] Further, the tubing is located inside the casing.

[0013] Further, the recovery tank is connected to the plugging agent tank.

[0014] Further, a first valve is provided between the recovery tank and the plug removal agent tank.

[0015] Further, the thin oil tank is connected to the plug removal agent tank.

[0016] Further, a fourth valve is provided between the thin oil tank and the plug removal agent tank.

[0017] Based on the above structure, the present invention also discloses a working method of a sucker rod pump unblocking system, including the following steps:

[0018] When a blockage and pump jamming occur, pull out the sucker rod, add plug removal agent into the tubing, soak and lubricate after filling up.

[0019] Open the second Christmas tree valve, the fourth Christmas tree valve, the second valve and the third valve, start the pump truck, inject the plug removal agent in the plug removal agent tank into the casing through the fourth Christmas tree valve. When the plug removal agent reaches the tail position of the tubing, stop the pump truck and let the sucker rod pump soak and lubricate for at least 2 hours.

[0020] Put back the sucker rod, start the pumping device, the pumping device drives the sucker rod pump to work, the plug removal agent is sucked through the tubing to wash the sucker rod pump, taking out the blockage, the plug removal agent flows out through the tubing, and flows into the recovery tank through the second Christmas tree valve.

[0021] After successful unblocking, close the third valve, open the second valve, and use thin oil through the pump truck to backflush the plug removal agent in the tubing to the recovery tank.

[0022] Further, when the plug removal agent flows out through the tubing and flows into the recovery tank through the second Christmas tree valve, open the first valve to connect the recovery tank and the plug removal agent tank, so that the plug removal agent in the recovery tank flows into the plug removal agent tank, and the plug removal agent is cyclically injected into the tubing for unblocking.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The present invention includes a pump truck, the pump truck is connected to the oil well, and the pump truck is used to pump the plug removal agent into the tubing of the oil well. The recovery tank is used to recover the plug removal agent during the unblocking process. The fourth Christmas tree valve is used to control the on-off between the oil well and the pump truck. The second Christmas tree valve is used to control the on-off between the oil well and the recovery tank. The pump truck is respectively connected to the thin oil tank and the plug removal agent tank. The thin oil in the thin oil tank and the plug removal agent in the plug removal agent tank are mixed and then injected into the tubing through the pump truck. A second valve is provided between the thin oil tank and the pump truck, and the second valve is used to control the on-off between the thin oil tank and the pump truck. A third valve is provided between the plug removal agent tank and the pump truck, and the third valve is used to control the on-off between the plug removal agent tank and the pump truck. The present invention can solve the problems of sucker rod pump jamming or tubing blockage, has a good unblocking effect, low cost, and avoids occupying the construction site.

[0025] In the method of the present invention, when blockage and pump jamming occur, the sucker rod is pulled out, and a plugging remover is added into the tubing 12. After filling it up, it is soaked for lubrication. The second Christmas tree valve, the fourth Christmas tree valve, the second valve and the third valve are opened, and the pump truck is started. The plugging remover in the plugging remover tank is injected into the casing through the fourth Christmas tree valve. When the plugging remover reaches the tail position of the tubing, the pump truck is stopped, and the submersible pump is soaked for lubrication for at least 2 hours. The sucker rod is put back, and the pumping device is started. The pumping device drives the submersible pump to work. The plugging remover is inhaled through the tubing to wash the submersible pump, bringing out the blockage. The plugging remover flows out through the tubing and flows into the recovery tank through the second Christmas tree valve 6. After successful plugging removal, the third valve is closed, the second valve is opened, and the plugging remover in the tubing is backflushed into the recovery tank with thin oil by the pump truck. The present invention can thoroughly solve the problems of submersible pump jamming or tubing blockage by injecting the plugging remover for soaking and lubrication, then moving the submersible pump while pumping to slowly bring out the blockage. The plugging removal effect is good, the cost is low, and it avoids occupying the construction site. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 is a flowchart of the method of the present invention.

[0028] Wherein: 1. thin oil tank; 2. plugging remover tank; 3. pump truck; 4. blowout preventer box; 5. first Christmas tree valve; 6. second Christmas tree valve; 7. third Christmas tree valve; 8. fourth Christmas tree valve; 9. sucker rod; 10. recovery tank; 11. first valve; 12. tubing; 13. casing; 14. submersible pump; 15. plugging remover; 16. pumping unit; 17. second valve; 18. third valve; 19. fourth valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] It should be noted that the terms "first", "second", etc. in the description, claims and above-mentioned drawings of the present invention are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such data used can be interchanged under appropriate circumstances, so that the embodiments of the present invention described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0031] The present invention will be further described in detail below with reference to the accompanying drawings:

[0032] See Figure 1 , the present invention discloses a stuck pump release system for a sucker rod pump, which includes a pump truck 3. The pump truck 3 is connected to an oil well, and the pump truck 3 is used to pump a plugging removal agent into the tubing 12 of the oil well. The oil well is connected to a recovery tank 10, and the recovery tank 10 is used to recover the plugging removal agent during the plugging removal process. A sucker rod 9 is arranged in the oil well, the sucker rod 9 is connected to the tubing 12, a sucker rod pump 14 is arranged in the tubing 12, a fourth Christmas tree valve 8 is provided between the oil well and the pump truck 3, and the fourth Christmas tree valve 8 is used to control the on-off between the oil well and the pump truck 3. A second Christmas tree valve 6 is provided between the oil well and the recovery tank 10, and the second Christmas tree valve 6 is used to control the on-off between the oil well and the recovery tank 10. The pump truck 3 is respectively connected to a thin oil tank 1 and a plugging removal agent tank 2. The thin oil in the thin oil tank 1 and the plugging removal agent in the plugging removal agent tank 2 are mixed and then injected into the tubing 12 through the pump truck 3. A second valve 17 is provided between the thin oil tank 1 and the pump truck 3, and the second valve 17 is used to control the on-off between the thin oil tank 1 and the pump truck 3. A third valve 18 is provided between the plugging removal agent tank 2 and the pump truck 3, and the third valve 18 is used to control the on-off between the plugging removal agent tank 2 and the pump truck 3. The present invention can thoroughly solve the problem of pump jamming or tubing blockage of the sucker rod pump by injecting a plugging removal agent for soaking and lubrication, and then pumping and moving the sucker rod pump while pumping, slowly bringing out the blockage, with good plugging removal effect, low cost, and avoiding occupying the construction site.

[0033] See Figure 1 , in another feasible embodiment of the present invention, the following is adaptively modified according to the situation. It includes a pump truck 3. The pump truck 3 is connected to an oil well, the oil well is connected to a recovery tank 10, a sucker rod 9 is arranged in the oil well, the sucker rod 9 is connected to the tubing 12, a sucker rod pump 14 is arranged in the tubing 12, a fourth Christmas tree valve 8 is provided between the oil well and the pump truck 3, a second Christmas tree valve 6 is provided between the oil well and the recovery tank 10, the pump truck 3 is respectively connected to a thin oil tank 1 and a plugging removal agent tank 2, a second valve 17 is provided between the thin oil tank 1 and the pump truck 3, and a third valve 18 is provided between the plugging removal agent tank 2 and the pump truck 3.

[0034] During specific operation, when blockage occurs and the pump is stuck, pull out the sucker rod 9, add a plugging removal agent into the tubing 12. After filling the plugging removal agent, soak and lubricate the subsurface pump 14 and the tubing 12. After the soaking and lubrication are completed, open the second production tree valve 6, the fourth production tree valve 8, the second valve 17 and the third valve 18, start the pump truck 3, inject the plugging removal agent in the plugging removal agent tank 2 into the casing 13 through the fourth production tree valve 8. When the plugging removal agent reaches the tail position of the tubing 12, stop the pump truck 3 and let the subsurface pump 14 soak and lubricate for at least 2 hours. Put back the sucker rod 9, start the pumping device. The pumping device drives the subsurface pump 14 to suck the plugging removal agent through the tubing 12 to flush the subsurface pump 14 and bring out the blockage. The plugging removal agent flows into the recovery tank 10 through the tubing 12 and the second production tree valve 6. After successful plugging removal, close the third valve 18, open the second valve 17, and use the thin oil through the pump truck 3 to backflush the plugging removal agent in the tubing into the recovery tank 10 to ensure the normal use of the pumping device after plugging removal.

[0035] Example 1:

[0036] See Figure 1 , this example discloses a stuck pump release system for a subsurface pump, including a pump truck 3. The pump truck 3 is connected to an oil well, the oil well is connected to a recovery tank 10. A sucker rod 9 is arranged in the oil well, the sucker rod 9 is connected to a tubing 12, a subsurface pump 14 is arranged in the tubing 12. A fourth production tree valve 8 is provided between the oil well and the pump truck 3, a second production tree valve 6 is provided between the oil well and the recovery tank 10. The pump truck 3 is respectively connected to a thin oil tank 1 and a plugging removal agent tank 2. A second valve 17 is provided between the thin oil tank 1 and the pump truck 3, and a third valve 18 is provided between the plugging removal agent tank 2 and the pump truck 3.

[0037] The sucker rod 9 is connected to a pumping unit 16.

[0038] Example 2:

[0039] See Figure 1 , this example discloses a stuck pump release system for a subsurface pump, including a pump truck 3. The pump truck 3 is connected to an oil well, the oil well is connected to a recovery tank 10. A sucker rod 9 is arranged in the oil well, the sucker rod 9 is connected to a tubing 12, a subsurface pump 14 is arranged in the tubing 12. A fourth production tree valve 8 is provided between the oil well and the pump truck 3, a second production tree valve 6 is provided between the oil well and the recovery tank 10. The pump truck 3 is respectively connected to a thin oil tank 1 and a plugging removal agent tank 2. A second valve 17 is provided between the thin oil tank 1 and the pump truck 3, and a third valve 18 is provided between the plugging removal agent tank 2 and the pump truck 3.

[0040] A blowout preventer box 4 is provided on the sucker rod 9. The blowout preventer box 4 is used for workover operations to prevent blowout accidents during the process of lifting the sucker rod.

[0041] Example 3:

[0042] SeeFigure 1 , this embodiment discloses a stuck sucker rod releasing system, including a pump truck 3 which is connected to an oil well. The oil well is connected to a recovery tank 10. A sucker rod 9 is arranged in the oil well, and the sucker rod 9 is connected to a tubing 12. A sucker rod pump 14 is arranged in the tubing 12. A fourth Christmas tree valve 8 is provided between the oil well and the pump truck 3, and a second Christmas tree valve 6 is provided between the oil well and the recovery tank 10. The pump truck 3 is respectively connected to a dilution oil tank 1 and a plugging removal agent tank 2. A second valve 17 is provided between the dilution oil tank 1 and the pump truck 3, and a third valve 18 is provided between the plugging removal agent tank 2 and the pump truck 3.

[0043] The tubing 12 is located inside the casing 13.

[0044] Embodiment 4:

[0045] See Figure 1 , this embodiment discloses a stuck sucker rod releasing system, including a pump truck 3 which is connected to an oil well. The oil well is connected to a recovery tank 10. A sucker rod 9 is arranged in the oil well, and the sucker rod 9 is connected to a tubing 12. A sucker rod pump 14 is arranged in the tubing 12. A fourth Christmas tree valve 8 is provided between the oil well and the pump truck 3, and a second Christmas tree valve 6 is provided between the oil well and the recovery tank 10. The pump truck 3 is respectively connected to a dilution oil tank 1 and a plugging removal agent tank 2. A second valve 17 is provided between the dilution oil tank 1 and the pump truck 3, and a third valve 18 is provided between the plugging removal agent tank 2 and the pump truck 3.

[0046] The recovery tank 10 is connected to the plugging removal agent tank 2, for returning the plugging removal agent in the recovery tank 10 to the plugging removal agent tank 2 to realize the reuse of the plugging removal agent.

[0047] Embodiment 5:

[0048] See Figure 1 , this embodiment discloses a stuck sucker rod releasing system, including a pump truck 3 which is connected to an oil well. The oil well is connected to a recovery tank 10. A sucker rod 9 is arranged in the oil well, and the sucker rod 9 is connected to a tubing 12. A sucker rod pump 14 is arranged in the tubing 12. A fourth Christmas tree valve 8 is provided between the oil well and the pump truck 3, and a second Christmas tree valve 6 is provided between the oil well and the recovery tank 10. The pump truck 3 is respectively connected to a dilution oil tank 1 and a plugging removal agent tank 2. A second valve 17 is provided between the dilution oil tank 1 and the pump truck 3, and a third valve 18 is provided between the plugging removal agent tank 2 and the pump truck 3.

[0049] A first valve 11 is provided between the recovery tank 10 and the plugging removal agent tank 2. The first valve 11 is used to control the on-off between the recovery tank 10 and the plugging removal agent tank 2.

[0050] Embodiment 6:

[0051] See Figure 1, this embodiment discloses a stuck pump release system for a sucker rod pump, which includes a pump truck 3. The pump truck 3 is connected to an oil well, and the oil well is connected to a recovery tank 10. A sucker rod 9 is arranged in the oil well, the sucker rod 9 is connected to a tubing 12, and a sucker rod pump 14 is arranged in the tubing 12. A fourth Christmas tree valve 8 is provided between the oil well and the pump truck 3, and a second Christmas tree valve 6 is provided between the oil well and the recovery tank 10. The pump truck 3 is respectively connected to a diluent tank 1 and a plugging agent tank 2. A second valve 17 is provided between the diluent tank 1 and the pump truck 3, and a third valve 18 is provided between the plugging agent tank 2 and the pump truck 3.

[0052] The diluent tank 1 is connected to the plugging agent tank 2. The diluent in the diluent tank 1 enters the plugging agent tank 2. The diluent is used to dilute the plugging agent to facilitate the entry of the plugging agent into the tubing 12.

[0053] Embodiment Seven:

[0054] See Figure 1 , this embodiment discloses a stuck pump release system for a sucker rod pump, which includes a pump truck 3. The pump truck 3 is connected to an oil well, and the oil well is connected to a recovery tank 10. A sucker rod 9 is arranged in the oil well, the sucker rod 9 is connected to a tubing 12, and a sucker rod pump 14 is arranged in the tubing 12. A fourth Christmas tree valve 8 is provided between the oil well and the pump truck 3, and a second Christmas tree valve 6 is provided between the oil well and the recovery tank 10. The pump truck 3 is respectively connected to a diluent tank 1 and a plugging agent tank 2. A second valve 17 is provided between the diluent tank 1 and the pump truck 3, and a third valve 18 is provided between the plugging agent tank 2 and the pump truck 3.

[0055] A fourth valve 19 is provided between the diluent tank 1 and the plugging agent tank 2. The fourth valve 19 is used to control the on-off between the diluent tank 1 and the plugging agent tank 2.

[0056] See Figure 2 , based on the above structure, the present invention also discloses a working method of a stuck pump release system for a sucker rod pump, which includes the following steps:

[0057] S1. When a pump is blocked and stuck, pull out the sucker rod 9, add a plugging agent into the tubing 12, and soak and lubricate it after filling.

[0058] S2. Open the second Christmas tree valve 6, the fourth Christmas tree valve 8, the second valve 17 and the third valve 18, start the pump truck 3, inject the plugging agent in the plugging agent tank 2 into the casing 13 through the fourth Christmas tree valve 8. When the plugging agent reaches the tail position of the tubing 12, stop the pump truck 3 and let the sucker rod pump 14 soak and lubricate for at least 2 hours.

[0059] S3. Put back the sucker rod 9, start the pumping device, the pumping device drives the sucker rod pump 14 to work, the plugging agent is sucked through the tubing 12 to wash the sucker rod pump 14, and the blockage is carried out. The plugging agent flows out through the tubing 12 and flows into the recovery tank 10 through the second Christmas tree valve 6.

[0060] At the same time, the first valve 11 is opened to connect the recovery tank 10 with the blocking agent tank 2, so that the blocking agent in the recovery tank 10 flows into the blocking agent tank 2, and the blocking agent is circulated and injected into the oil pipe 12 for unblocking;

[0061] S4. After the blockage is removed successfully, the third valve 18 is closed, the second valve 17 is opened, and the blockage remover in the oil pipe is discharged back to the recovery tank 10 by the pump truck 3 with thin oil.

[0062] See also Figure 2 In another feasible embodiment of the present invention, the following is adaptively modified according to the situation. When the pump is blocked, pull out the sucker rod 9, add the unblocking agent into the oil pipe 12, and soak it for lubrication after filling it up. Open the second Christmas tree valve 6, the fourth Christmas tree valve 8, the second valve 17 and the third valve 18, start the pump truck 3, and inject the unblocking agent in the unblocking agent tank 2 into the casing 13 through the fourth Christmas tree valve 8. When the unblocking agent reaches the tail position of the oil pipe 12, stop the pump truck 3 and let the pump 14 soak for lubrication for at least 2 hours. Put back the sucker rod 9, start the pumping device, and the pumping device drives the pump 14 to work. The unblocking agent is sucked through the oil pipe 12 to flush the pump 14, bringing out the blockage, and the unblocking agent flows out through the oil pipe 12 and flows into the recovery tank 10 through the second Christmas tree valve 6. After the unblocking is successful, close the third valve 18, open the second valve 17, and use thin oil to return the unblocking agent in the oil pipe to the recovery tank 10 through the pump truck 3. The invention can completely solve the problem of oil pump jam or oil pipe blockage, has good unblocking effect, low cost and avoids occupying construction sites.

[0063] Embodiment eight:

[0064] In order to solve the problem of pump sticking, the present embodiment discloses a working method of a pump unstuck system. The present invention changes the traditional method of handling pump sticking. It is not necessary to lift out the pipe string and the pump. The pipe string and the pump are first soaked and lubricated with a plugging remover, and then the pump is moved while pumping to slowly remove the blockage, thereby handling the problem of pump sticking. Not only is the on-site construction simple, the plugging remover can be returned and recycled, and the pump sticking problem can be completely solved, thereby increasing the oil well production.

[0065] The specific steps are as follows:

[0066] S1. Pull out the sucker rod 9, add the unblocking agent 15 into the oil pipe 12, and soak and lubricate it for 1 hour after filling it up.

[0067] S2, connect the unblocking agent tank, recovery tank, thin oil tank and pump truck through pipelines; open the second Christmas tree valve 6 and the fourth Christmas tree valve 8, and close the first Christmas tree valve 5 and the third Christmas tree valve 7;

[0068] S3. Open the outlet valves of the plugging remover tank 2 and the recovery tank, start the pump truck 3, and let the plugging remover enter the casing 13 through the fourth production tree valve 8. When the plugging remover 15 reaches the tail position of the tubing 12, stop the pump and soak and lubricate for 2 hours. Replace the sucker rod 9, start the pumping unit 16, the pumping unit 16 drives the subsurface pump 14 to work, the tubing 12 will suck the plugging remover into it, flush the subsurface pump 14, and slowly carry out the blockage. The plugging remover 15 flows out through the tubing, flows into the recovery tank 10 through the second production tree valve 6. During plugging removal, the first valve 11 between the recovery tank and the plugging remover tank 2 can be opened to let the plugging remover 15 flow into the plugging remover tank 2 for cyclic injection of plugging removal.

[0069] S4. After the tubing plugging removal is successful, open the thin oil tank, start the pump, and use the thin oil to backflush the plugging remover in the tubing into the recovery tank.

[0070] The flow path of the plugging remover is as follows: The space between the tubing and the casing is abbreviated as the annulus. It flows from the plugging remover tank 2 to the fourth production tree valve 8. The fourth production tree valve 8 is connected to the casing 13 and enters the casing annulus. It flows downward from the casing annulus to the tail end position of the tubing 12 and enters the tubing. The tail end of the tubing is open. Then it flows from the tubing to the second production tree valve 6 and flows out to the recovery tank. Finally, by opening the first valve 11, it can flow to the plugging remover tank 2 for such cycling.

[0071] The object of the present invention is to solve the problems that the current construction period of the subsurface pump stuck pump inspection pump is long, the construction is complex, the cost is high, there is a certain risk of environmental pollution, which affects the normal production of oil wells and reduces the output. By injecting the plugging remover for soaking and lubricating, and then moving the subsurface pump while pumping, the blockage is slowly carried out, and the blockage problem of the subsurface pump stuck pump or the tubing is completely solved. The plugging removal effect is good and the cost is low.

[0072] The above content is only to illustrate the technical idea of the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution according to the technical idea proposed by the present invention fall within the protection scope of the claims of the present invention.

Claims

1. A stuck pump release system, characterized in that, It includes a pump truck (3). The pump truck (3) is connected to an oil well, and the oil well is connected to a recovery tank (10). A sucker rod (9) is arranged in the oil well. The sucker rod (9) is connected to a tubing string (12). A subsurface pump (14) is arranged in the tubing string (12). A fourth Christmas tree valve (8) is provided between the oil well and the pump truck (3), and a second Christmas tree valve (6) is provided between the oil well and the recovery tank (10). The pump truck (3) is respectively connected to a thin oil tank (1) and a plugging removal agent tank (2). A second valve (17) is provided between the thin oil tank (1) and the pump truck (3), and a third valve (18) is provided between the plugging removal agent tank (2) and the pump truck (3).

2. The tubing pump sticking releasing system according to claim 1, wherein The sucker rod (9) is connected to a pumping unit (16).

3. The pipe extractor unjamming system according to claim 2, wherein, A blowout preventer box (4) is provided on the sucker rod (9).

4. A stuck pump release system according to claim 1, wherein, The tubing string (12) is located inside a casing (13).

5. The stuck pipe releasing system for a sucker rod pump according to claim 1, wherein, The recovery tank (10) is connected to the plugging removal agent tank (2).

6. The pipe extractor unjamming system according to claim 5, wherein, A first valve (11) is provided between the recovery tank (10) and the plugging removal agent tank (2).

7. The tubing pump sticking releasing system according to claim 1, wherein, The thin oil tank (1) is connected to the plugging removal agent tank (2).

8. The oil pump unjamming system according to claim 7, characterized in that, A fourth valve (19) is provided between the thin oil tank (1) and the plugging removal agent tank (2).

9. A working method of the stuck pump release system according to any one of claims 1 to 8, characterized in that, It includes the following steps: When a pump is blocked, pull out the sucker rod (9), add a plugging removal agent into the tubing string (12), soak and lubricate it after filling it up; Open the second Christmas tree valve (6), the fourth Christmas tree valve (8), the second valve (17) and the third valve (18), start the pump truck (3), inject the plugging removal agent in the plugging removal agent tank (2) into the casing (13) through the fourth Christmas tree valve (8). When the plugging removal agent reaches the tail position of the tubing string (12), stop the pump truck (3) to soak and lubricate the subsurface pump (14) for at least 2 hours; Put back the sucker rod (9), start the pumping device. The pumping device drives the subsurface pump (14) to work. The plugging removal agent is sucked through the tubing string (12) to wash the subsurface pump (14), bringing out the blockage. The plugging removal agent flows out through the tubing string (12) and flows into the recovery tank (10) through the second Christmas tree valve (6); After successful plugging removal, close the third valve (18), open the second valve (17), and use thin oil through the pump truck (3) to backflush the plugging removal agent in the tubing into the recovery tank (10).

10. The working method of a sucker rod pump unjamming system as described in claim 9, characterized in that, While the plugging removal agent flows out through the tubing string (12) and flows into the recovery tank (10) through the second Christmas tree valve (6), open the first valve (11) to connect the recovery tank (10) and the plugging removal agent tank (2), so that the plugging removal agent in the recovery tank (10) flows into the plugging removal agent tank (2), and the plugging removal agent is cyclically injected into the tubing string (12) for plugging removal.

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