A downhole pollution prevention and well washing device for load reduction
By using a combination of tubing peristaltic expansion compensator, multi-functional screen pipe and self-draining seal in oil wells, the problem of hot washing fluid entering the oil layer and contaminating it was solved, achieving efficient anti-contamination well washing and reducing operating costs and difficulty.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- LIAONING HUAYE ENERGY TECH SERVICE CO LTD
- Filing Date
- 2025-07-10
- Publication Date
- 2026-05-26
AI Technical Summary
In existing technologies, hot washing fluid can easily enter the oil layer when cleaning oil wells, leading to oil layer contamination, reduced hot washing effect, and increased energy waste. Furthermore, traditional anti-contamination devices have poor sealing performance, short service life, and are difficult to operate.
The well-washing device, which includes a peristaltic expansion compensator for the tubing string, a multi-functional screen pipe, a self-draining sealer, and a leak-proof single-flow valve, is used to reduce pressure and prevent contamination during well workover. It achieves sealing by raising and lowering the production tubing string to prevent hot washing fluid from entering the oil layer and to reduce pressure and load during well workover.
It effectively prevents hot washing fluid from entering the oil layer, improves the hot washing effect, reduces operating costs, simplifies operation, reduces the risk of pipe jamming, and improves operation efficiency.
Smart Images
Figure CN224282594U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of oilfield production technology, specifically to a downhole anti-pollution well washing device for reducing load. Background Technology
[0002] During oil well production, the vast majority of wells use mechanical pumping, where crude oil in the formation is drawn to the surface through tubing by a pump. As the crude oil flows through the tubing and the temperature gradually decreases, some wax precipitates out and adheres to the inner wall of the tubing and the outer surface of the sucker rod. As the amount of wax adhering to these surfaces increases, hot washing fluid, such as hot water, is typically used for cleaning. The usual cleaning method involves the hot washing fluid entering the well through the annular space between the casing and tubing, then returning to the surface from the bottom of the pump through the same annular space. Because the formation pressure is lower than the hydrostatic pressure at the same depth during oil production, some hot washing fluid inevitably enters the oil layer during the wax removal process. The lower the pressure, the more hot washing fluid enters the oil layer, causing varying degrees of contamination. Simultaneously, because some hot washing fluid enters the oil layer, the amount of cleaning fluid used to clean the inner wall of the tubing and the outer surface of the sucker rod decreases, significantly reducing the effectiveness of the hot washing. After hot washing and wax removal, the hot washing fluid that entered the oil layer must first be extracted, resulting in energy waste and reduced effective oil production time, thus lowering the well's production efficiency. Other anti-contamination hot washing and wax removal technologies for pumping wells have also been used in oilfields, such as rubber cup-type anti-contamination washing devices and anti-contamination washing tubing strings containing packers. However, these technologies have not been widely adopted due to problems such as poor sealing, short service life, excessive load on the tubing string during well workover operations, easy jamming, and difficulty in operating downhole tools.
[0003] To address the aforementioned problems, a downhole anti-pollution well-washing device with reduced load was invented. Utility Model Content
[0004] In view of the problems existing in the prior art, this utility model discloses a downhole anti-pollution well washing device for load reduction. The technical solution adopted includes a tubing peristaltic expansion compensator, a multi-functional screen pipe, a self-draining seal, and a leak-proof check valve. The top of the leak-proof check valve is sequentially provided with a self-draining seal, a multi-functional screen pipe, and a tubing peristaltic expansion compensator. The bottom of the self-draining seal is threadedly connected to the top of the leak-proof check valve. The top of the self-draining seal is threadedly connected to the bottom of the multi-functional screen pipe. The top of the multi-functional screen pipe is threadedly connected to the bottom of the tubing peristaltic expansion compensator.
[0005] As a preferred embodiment of this utility model, the multifunctional screen pipe includes a screen pipe upper connector, a screen pipe body, and fluid transmission holes. The screen pipe upper connector is located at the top of the screen pipe body, and fluid transmission holes are evenly arranged in an array around the screen pipe body. The main function of the multifunctional screen pipe is to cooperate with the leak-proof check valve to form an oil flow channel connecting the upper and lower interfaces of the self-draining seal, ensuring that the dynamic fluid level can be tested during oil well production and that the well-washing fluid can enter the tubing and sucker rod annulus during well washing.
[0006] As a preferred embodiment of this utility model, the peristaltic expansion compensator for the production tubing includes an upper connector, an outer tubing, an inner tubing, a clutch clamp, a tubing pin, and a lower connector. The inner tubing is slidably installed inside the outer tubing. The upper connector is located at the top of the inner tubing. Clutch clamps are located at the bottom of the inner tubing and the top of the outer tubing, respectively, and the clutch clamps at the bottom of the inner tubing and the top of the outer tubing engage with each other. At least one tubing pin is located at the top of the outer side of the outer tubing, and the pin is inserted into the bottom of the outer side of the inner tubing. The lower connector at the bottom of the outer tubing is threadedly connected to the upper connector of the screen tube. The main function of the peristaltic expansion compensator is to compensate for the peristaltic expansion distance of the production tubing during production, preventing damage to the seals of the self-leaking seal due to the peristalsis of the production tubing and maintaining a sealed state.
[0007] As a preferred embodiment of this utility model, the self-draining sealer includes an upper sealer connector, an outer sealer tube, a central sealer tube, a sealer pin, a sealing element, a cone, a locking tooth, a pressure relief hole, a straightening body, a straightening block, a track groove, and a lower sealer connector. The upper sealer connector at the top of the outer sealer tube is threadedly connected to the bottom of the screen tube body. A sealing element is fixedly installed on the middle of the outer side of the outer sealer tube. A cone and a straightening body are provided at the bottom of the outer sealer tube, and the cone is fixedly connected to the outer sealer tube. A pressure relief hole is provided in the middle of the cone. The central sealer tube is slidably installed on the inner side of the outer sealer tube. At least one sealer pin is provided at the top of the outer side of the outer sealer tube, and the sealer pin is inserted into the top of the outer side of the central sealer tube. A track groove is formed at the middle and bottom of the outer side of the central sealer tube. The track groove is slidably connected to the straightening block provided on the straightening body. A locking tooth is provided on the outer side of the straightening body. The lower sealer connector is provided at the bottom of the central sealer tube. The main function of the self-draining seal is to prevent the washing fluid from entering the oil layer and causing oil layer contamination during hot well washing; at the same time, it can release the liquid load of the annulus above it during well workover operations, which is beneficial to prevent the workover machine from being overloaded when running the tubing string and to successfully complete the work task.
[0008] As a preferred embodiment of this utility model, sealing rings are fixedly installed at both ends of the pressure relief hole.
[0009] As a preferred embodiment of this utility model, the leak-proof check valve includes an upper check valve connector, a check valve body, and a lower check valve connector. The upper check valve connector is located at the top of the check valve body and is threadedly connected to the lower seal connector. The lower check valve connector is located at the bottom of the check valve body. The main function of the leak-proof check valve is to serve as the inlet for oil flow from the wellbore into the production tubing.
[0010] The beneficial effects of this utility model are as follows: Compared with the current similar hot washing processes, the reduced-load downhole anti-pollution well washing device and hot washing method are simpler to operate. Similar processes either require rotating the tubing multiple times before setting or pressurizing with a pump truck before setting, and the results after setting are not very noticeable. The setting method of this utility model appears to only require one action of lifting and lowering the production tubing string, but in reality, the lifting and lowering action triggers a linkage between the clutch clamp on the tubing string creep expansion compensator, the tubing string pin, and the sealing pin, sealing element, cone, locking teeth, straightening block, and straightening body on the self-draining sealer to complete the setting.
[0011] The setting load required is low, which is not likely to cause the tubing to jam. In similar processes, standard packers are used as sealers. To ensure a true seal, the setting must be performed according to the technical specifications of the packer. The load is relatively large, and if the production time is slightly longer, the tubing will jam, resulting in damage to the rubber sleeve. In this method, the setting load of the sealer is only about half of the setting load of the packer. Therefore, the load is low and it is not likely to cause the tubing to jam.
[0012] It features self-relief and load reduction functions, improving operational efficiency and saving operating costs. Similar processes do not have self-relief and load reduction functions. During well workover operations, they either need to lower the fluid level to reduce the annular fluid load before proceeding, or they need to increase the lifting load of the operating equipment. This affects operational efficiency and increases operating costs. This device and method only requires lifting the tubing string to directly release the annular fluid load above the self-relief seal, without the need for other methods, thus saving operating costs. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the structure of the tubular creep expansion compensator of this utility model;
[0014] Figure 2 This is a partial cross-sectional structural diagram of the clutch clamp of this utility model;
[0015] Figure 3 This is a schematic diagram of the multifunctional screen tube structure of this utility model;
[0016] Figure 4 This is a schematic diagram of the self-draining seal of this utility model;
[0017] Figure 5 This is a schematic diagram of the leak-proof single-flow valve structure of this utility model;
[0018] Figure 6 This is a schematic diagram of the backwashing process of this utility model;
[0019] Figure 7 This is a schematic diagram of the unpacking and unloading process of this utility model.
[0020] In the diagram: 1. Peristaltic expansion joint of the tubing string; 11. Upper connector of the tubing string; 12. Outer tube of the tubing string; 13. Inner tube; 14. Clutch clamp; 15. Tubing string pin; 16. Lower connector of the tubing string; 2. Multifunctional screen tube; 21. Upper connector of the screen tube; 22. Screen tube body; 23. Liquid transfer hole; 3. Self-draining seal; 31. Upper connector of the seal; 32. Outer tube of the seal; 33. Central tube of the seal; 34. Seal 35. Seal; 36. Cone; 37. Clamping tooth; 38. Pressure relief hole; 39. Centralizing body; 310. Centralizing block; 311. Track groove; 312. Lower connector of seal; 4. Leak-proof check valve; 41. Upper connector of check valve; 42. Check valve body; 43. Lower connector of check valve; 5. Oil layer casing; 6. Sucker rod; 7. Production tubing; 8. Oil pump; 9. Sand anchor; 10. Plug. Detailed Implementation
[0021] Example 1
[0022] like Figures 1 to 5As shown, this utility model discloses a downhole anti-pollution well washing device for reduced load. The technical solution adopted includes a tubing peristaltic expansion compensator 1, a multi-functional screen pipe 2, a self-draining seal 3, and a leak-proof check valve 4. The top of the leak-proof check valve 4 is sequentially equipped with the self-draining seal 3, the multi-functional screen pipe 2, and the tubing peristaltic expansion compensator 1. The bottom of the self-draining seal 3 is threadedly connected to the top of the leak-proof check valve 4. The leak-proof check valve 4 includes a check valve upper connector 41, a check valve body 42, and a check valve lower connector 43. The top of the check valve body 42 is equipped with the check valve upper connector 41, which is threadedly connected to the seal lower connector 312. The bottom of the check valve body 42 is equipped with the check valve lower connector 43. During hot well washing, the leak-proof check valve... The installation of the flow valve 4 and the sealing of the self-draining seal 3, along with the sealing element 35 sealing the annular space between the oil layer casing 5 and the production tubing 7, prevent hot washing fluid from entering the oil layer. The self-draining seal 3 includes an upper seal 31, an outer seal 32, a central seal 33, a seal pin 34, a seal 35, a cone 36, a locking tooth 37, a pressure relief hole 38, a centralizing body 39, a centralizing block 310, a track groove 311, and a lower seal 312. The upper seal 31, located at the top of the outer seal 32, is threaded to the bottom of the screen tube body 22. The seal 35 is fixedly installed on the middle of the outer side of the outer seal 32. The cone 36 and the centralizing body 39 are located at the bottom of the outer seal 32, and the cone 36 is connected to the seal. The outer tube 32 is fixedly connected, and a pressure relief hole 38 is provided in the middle of the cone body 36. A sealer center tube 33 is slidably installed on the inner side of the sealer outer tube 32. At least one sealer pin 34 is provided on the top of the outer side of the sealer outer tube 32, and the sealer pin 34 is inserted into the top of the outer side of the sealer center tube 33. Track grooves 311 are opened in the middle and bottom of the outer side of the sealer center tube 33. Track grooves 311 are slidably connected to the straightening block 310 provided on the straightening body 39. The outer side of the straightening body 39 is provided with a locking tooth 37. A sealer lower connector 312 is provided at the bottom of the sealer center tube 33. During the sealing process, the straightening block 310 on the straightening body 39 rubs against the oil layer sleeve 5, causing the straightening block 310 to slide along the short groove at the bottom of the track groove 311. The reversal is completed, allowing the locking teeth 37 on the straightening body 39 to expand outward. Conversely, when the straightening block 310 slides to the long groove at the top of the track groove 311, the locking teeth 37 on the straightening body 39 can retract inward. Secondly, during the pipe lowering process, when the load on the sealing pin 34 exceeds 3 tons, the sealing pin 34 on the outer pipe 32 of the sealing device is sheared, causing the sealing element 35 and the cone 36 to be forced downward. The locking teeth 37 expand outward under this downward force, achieving a seat seal. After the seat seal is achieved, the sealing element 35 also expands outward under this downward force, sealing the passage of the annular space between the oil layer casing 5 and the production tubing 7, thus blocking the fluid passage between the upper and lower end faces of the self-draining sealer 3, the oil layer casing 5, and the production tubing 7.In conjunction with the leak-proof check valve 4, it prevents fluid from entering the oil layer through the annular space of the self-draining seal 3, thus preventing oil layer contamination. Sealing rings are fixedly installed at both ends of the pressure relief hole 38. After the self-draining seal 3 completes its setting, the sealing element 35 and the cone 36 will be forced downwards, and the locking teeth 37 will open outwards, thereby sealing the passage in the annular space of the oil sleeve. At this time, the sealing rings at both ends of the pressure relief hole 38 fit tightly with the surrounding components, forming a reliable sealing barrier to ensure that fluid will not leak through the pressure relief hole 38. Only when well workover operations are required and the production tubing is pulled up, the outer sealing tube 32 and the central sealing tube of the self-draining seal 3... Only when relative displacement occurs at point 33 will the pressure relief hole 38 be opened, thus achieving the self-pressure relief function; the top of the self-releasing seal 3 is threadedly connected to the bottom of the multi-functional screen tube 2. The multi-functional screen tube 2 includes a screen tube upper connector 21, a screen tube body 22, and a liquid transmission hole 23. The top of the screen tube body 22 is provided with the screen tube upper connector 21, and the liquid transmission holes 23 are evenly arrayed around the screen tube body 22. The top of the multi-functional screen tube 2 is threadedly connected to the bottom of the tubing peristaltic expansion compensator 1. The tubing peristaltic expansion compensator 1 includes a tubing upper connector 11, a tubing outer tube 12, an inner tube 13, a clutch clamp 14, a tubing pin 15, and a tubing lower connector 16. The tubing outer tube 12... An inner tube 13 is slidably installed on the inner side of the screen. A pipe column upper connector 11 is provided at the top of the inner tube 13. Clutches 14 are respectively provided at the bottom of the inner tube 13 and the top of the outer pipe 12, and the clutches 14 at the bottom of the inner tube 13 and the clutches 14 at the top of the outer pipe 12 are interlocked. At least one pipe column pin 15 is provided at the top outer side of the outer pipe 12, and the pipe column pin 15 is inserted into the bottom outer side of the inner tube 13. A pipe column lower connector 16 is provided at the bottom of the outer pipe 12 and is threadedly connected to the screen pipe upper connector 21. As the load on the lowered pipe column gradually increases after setting, when the load borne by the pipe column pin 15 exceeds 4 tons, the pipe column on the outer pipe 12... The pin 15 is sheared off, allowing relative sliding between the inner tube 13 and the outer tube 12. During production in a mechanically operated oil well, the production tubing 7 will move up and down, and simultaneously, the inner tube 13 and the outer tube 12 will also slide and adjust synchronously. This compensates for the creeping extension distance of the production tubing 7 during production, preventing damage to the seal 35 of the self-leaking seal 3 due to the creeping of the production tubing 7. When the well needs to rotate the production tubing 7 due to special circumstances, simply lift the production tubing 7. When the lower end of the inner tube 13 and the upper end of the outer tube 12 overlap, the clutch clamps 14 will engage, allowing the production tubing 7 to rotate.
[0023] like Figure 6 , Figure 7 As shown, the hot washing method of the above-mentioned unloaded downhole pollution prevention and washing device is achieved through the following steps:
[0024] Step 1: Prepare tools and tubing: 1. Tubing creep expansion compensator, 2. Multi-functional screen pipe, 3. Self-draining seal, 4. Leak-proof check valve, 6. Sucker rod, 7. Production tubing, 8. Oil pump, 9. Sand anchor, and 10. Plug.
[0025] Step 2: Connect the leak-proof single-flow valve 4, self-draining seal 3, multi-functional screen pipe 2, and tubing peristaltic expansion compensator 1 from bottom to top with threaded connections to form a downhole anti-pollution washing device for load reduction. Connect the lower end of the downhole anti-pollution washing device to the upper end of the tailpipe of the oil pump 8 in the production tubing string 7, and connect the upper end of the downhole anti-pollution washing device to the lower end of the oil pump 8 in the production tubing string 7. Then, run the production tubing string 7 into the well according to the tubing string structure sequence designed in the engineering design. The bottom of the production tubing string 7 is connected with a sand anchor 9 and a plug 10.
[0026] Step 3: After the production string 7 equipped with the downhole anti-contamination well-washing device is lowered to the designed position, first raise the production string 7 by 1.6 meters, then lower it by 1 meter. During the lowering process, the load on the production string 7 is controlled by the load indicator on the surface workover rig, allowing the operator to maintain the load within a suitable range. This single action completes the device's function of preventing well-washing fluid from entering the oil layer and causing oil layer contamination during hot well washing; it also compensates for the creeping extension and contraction of the production string 7 during production, preventing the self-leaking seal 3 from leaking. The seal is designed to prevent damage due to the creep of the production tubing 7. This is achieved through a lifting and lowering action. First, the centering block 310 on the centering body 39 of the self-draining seal 3 rubs against the oil layer casing 5, causing the centering block 310 to slide along the short groove at the bottom of the track groove 311, completing the reversal. This allows the locking teeth 37 on the centering body 39 to extend outwards. Second, during the lowering process, when the load on the seal pin 34 exceeds 3 tons, the seal pin 34 on the outer tube 32 of the seal is sheared off, allowing... The sealing element 35 and the cone 36 are forced downwards, and the locking tooth 37 is forced outwards by this downward force, achieving a setting seal. After setting, the sealing element 35 is also forced outwards by this downward force, sealing the annular space between the oil layer casing 5 and the production tubing 7. This blocks the fluid passage between the upper and lower end faces of the self-draining seal 3, the oil layer casing 5, and the production tubing 7. With the cooperation of the anti-leakage check valve 4, the function of preventing fluid from entering the oil layer through the annular space on the upper end face of the self-draining seal 3 and causing oil layer contamination is achieved. Then, the production tubing is lowered again after setting. As the load on the production column 7 gradually increases, when the load on the pin 15 exceeds 4 tons, the pin 15 on the outer tube 12 is sheared off, causing relative sliding between the inner tube 13 and the outer tube 12. When the lower end of the inner tube 13 and the upper end of the outer tube 12 overlap, the clutches 14 engage with each other to prevent rotation. At the same time, the sliding adjustment between the inner tube 13 and the outer tube 12 compensates for the creeping expansion and contraction distance during the production of the production column 7, preventing the sealing element 35 of the self-leaking seal 3 from being damaged by the creeping of the production column 7.
[0027] Step 4: During hot washing and dewaxing of the oil well, the hot washing fluid enters the well through the annular space between the oil layer casing 5 and the production tubing 7. Due to the sealing effect of the seal 35 on the self-draining sealer 3 and the sealing function of the leak-proof check valve 4 at this time, the hot washing fluid cannot enter the oil layer through the self-draining sealer 3. The hot washing fluid can only enter the lower part of the pumping pump 8 through the fluid transmission hole 23 on the multi-functional screen pipe 2. The pumping pump 8 then returns the liquid to the surface through the production tubing 7. Figure 6 In the middle, the direction of the flow of hot water injected during backwashing between the oil layer casing 5 and the production tubing 7 is shown by the arrows; thus, the hot washing liquid is prevented from entering the oil layer, avoiding contamination of the oil layer by external media.
[0028] Step 5: When a problem occurs in the oil well requiring a workover operation, first lift the production tubing 7. Since the weight of the well-washing fluid is applied to the seal 35 of the self-draining seal 3 during this operation, lifting the production tubing 7 will cause relative displacement between the outer seal tube 32 and the central seal tube 33 of the self-draining seal 3. This will open the pressure relief hole 38 on the self-draining seal 3, allowing the fluid in the annular space between the oil layer casing 5 and the production tubing 7 to flow along the self-draining seal. The water flows into the upper end face of the upper connector 31 of the outer tube 32 of the sealer 3, and flows down along the annular channel between the outer tube 32 and the central tube 33 of the sealer, and finally flows out from the pressure relief hole 38. This completes the self-pressure relief and load reduction function. As shown in 7, the water column in the annulus between the oil layer casing 5 and the production tubing 7 flows in the direction of the arrow shown, so that the well workover operation can be carried out normally. This solves the problems of excessive load on the tubing string or easy jamming during well workover operations and the difficulty of operating the downhole tools during operations.
[0029] Components not described in detail in this article are existing technologies.
[0030] While the specific embodiments of this utility model have been described in detail above, this utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this utility model. Modifications or variations that do not involve creative labor are still within the protection scope of this utility model.
Claims
1. A downhole decontamination cleanout device for load relief, characterized in that, The device includes a tubing peristaltic expansion compensator (1), a multi-functional screen tube (2), a self-draining seal (3), and a leak-proof check valve (4). The top of the leak-proof check valve (4) is sequentially provided with the self-draining seal (3), the multi-functional screen tube (2), and the tubing peristaltic expansion compensator (1). The bottom of the self-draining seal (3) is threadedly connected to the top of the leak-proof check valve (4). The top of the self-draining seal (3) is threadedly connected to the bottom of the multi-functional screen tube (2). The top of the multi-functional screen tube (2) is threadedly connected to the bottom of the tubing peristaltic expansion compensator (1).
2. A downhole decontamination cleanout device of claim 1, wherein: The multifunctional sieve tube (2) includes a sieve tube upper connector (21), a sieve tube body (22) and a liquid transfer hole (23). The sieve tube upper connector (21) is provided on the top of the sieve tube body (22), and the liquid transfer holes (23) are uniformly arranged in an array around the sieve tube body (22).
3. A downhole decontamination cleanout device of claim 2, wherein: The tubing creep expansion compensator (1) includes an upper tubing connector (11), an outer tubing (12), an inner tubing (13), a clutch clamp (14), a tubing pin (15), and a lower tubing connector (16). The inner tubing (13) is slidably installed on the inner side of the outer tubing (12). The upper tubing connector (11) is provided at the top of the inner tubing (13). The bottom of the inner tubing (13) and the top of the outer tubing (12) are respectively provided with... There is a clutch clamp (14), and the clutch clamp (14) at the bottom of the inner tube (13) and the clutch clamp (14) at the top of the outer tube (12) of the tube column are engaged with each other. At least one tube column pin (15) is provided on the top of the outer side of the outer tube (12), and the tube column pin (15) is inserted into the bottom of the outer side of the inner tube (13). The lower tube column connector (16) provided at the bottom of the outer tube (12) is threadedly connected to the upper connector (21) of the screen tube.
4. The downhole decontamination clean-out device of claim 2, wherein: The self-draining seal (3) includes an upper seal connector (31), an outer seal tube (32), a central seal tube (33), a seal pin (34), a seal element (35), a cone (36), a locking tooth (37), a pressure relief hole (38), a straightening body (39), a straightening block (310), a track groove (311), and a lower seal connector (312). The upper seal connector (31) at the top of the outer seal tube (32) is threaded to the bottom of the screen tube body (22). A seal element (35) is fixedly installed on the middle of the outer side of the outer seal tube (32). A cone (36) and a straightening body (39) are provided at the bottom of the outer seal tube (32), and the cone (36) is connected to the outer seal tube. (32) Fixed connection, the middle part of the vertebra (36) is provided with a pressure relief hole (38), the inner side of the outer tube (32) of the sealer is slidably installed with a central tube (33), at least one sealer pin (34) is provided on the top of the outer side of the outer tube (32), and the sealer pin (34) is inserted into the top of the outer side of the central tube (33). The middle and bottom of the outer side of the central tube (33) of the sealer are provided with a track groove (311), the track groove (311) is slidably connected with the straightening block (310) provided on the straightening body (39), the outer side of the straightening body (39) is provided with a locking tooth (37), and the bottom of the central tube (33) of the sealer is provided with a lower sealer connector (312).
5. A downhole decontamination cleanout device of claim 4, wherein: Sealing rings are fixedly installed at both ends of the pressure relief hole (38).
6. A downhole decontamination cleanout device of claim 4, wherein: The leak-proof check valve (4) includes a check valve upper connector (41), a check valve body (42), and a check valve lower connector (43). The check valve upper connector (41) is provided on the top of the check valve body (42), and the check valve upper connector (41) is threadedly connected to the seal lower connector (312). The check valve lower connector (43) is provided on the bottom of the check valve body (42).