A downhole plug-and-abandonment assembly

Abstract

This invention discloses a downhole insertion-type long-lasting isolating production combination tool, relating to the field of long-lasting isolator technology. It includes a central tube, with a fixing block fixed at an equal angle on the outer side of the upper end of the central tube. The fixing block is fixed to a connector, and a sealing mechanism for sealing the production pipe is slidably connected to the inner side of the connector. This downhole insertion-type long-lasting isolating production combination tool employs a cleaning mechanism that converts axial gravity into rotational torque through a combination of spirally distributed rollers. When the tool is lowered, the arc-shaped panel adheres tightly to the pipe wall under the thrust of the airbag. The friction between the spiral rollers (30°-60° rise angle) and the pipe wall generates a tangential component force that causes the entire rotating assembly (ring, arc-shaped panel, scraper) to rotate around the central tube. The scraper rotates accordingly, scraping away the circumferential attachments. This process continues throughout the entire lowering stroke, achieving a pretreatment effect on the well wall of the sealing section, significantly improving the contact quality and working life of the subsequent sealing sleeve and metal slips.

Description

Technical Field

[0001] This invention relates to the field of long-term barrier technology, specifically to a downhole insertion-type long-term barrier production combination tool. Background Technology

[0002] In oilfield development, downhole tubing packer technology is widely used in stratified oil production, water shut-off, and testing operations. Existing long-life packers, such as the novel high-compression-ratio water injection long-life packer (publication number CN217976156U), include an upper connector, lower connector, upper mandrel, lower mandrel, setting shear pin, and releasing shear pin. The packer incorporates a rubber sleeve sealing mechanism, consisting of a rubber sleeve and a protective device. The protective device is a basket-like structure made of a high-strength, elastic material, possessing both high elasticity and the ability to enclose the rubber sleeve under significant compression deformation, thereby improving the sleeve's compression performance. This existing technology allows the packer to be run into the target formation through a smaller casing-to-wellbore configuration. The first and second stage piston cylinders enable the rubber sleeve to generate a high compression ratio during pressurization and setting, effectively sealing a large annulus. When pressurization stops, the packer can maintain its setting state for an extended period. This packer has a simple structure and is easy to maintain.

[0003] The aforementioned existing devices still have some shortcomings in practical use:

[0004] Traditional tool sealing elements (such as rubber sleeves) are in direct contact with the inner wall of the production pipe. Since the downhole pipe wall is often covered with composite deposits such as wax, scale, and sand, the tool itself cannot remove these contaminants during the tool running process. This causes the rubber sleeve to sit on foreign objects, resulting in poor initial sealing or accelerated wear under long-term alternating loads, which can easily lead to early failure.

[0005] After the tool is lost, the central tube channel is directly exposed to formation pressure. If an effective shut-off mechanism is not designed, fluids (oil, water, sand) in the well are very likely to surge upwards when the upper tubing is pulled out. This not only pollutes the work site and brings safety risks, but may also affect the formation or the tool that has been set due to sudden changes in fluid column pressure. Summary of the Invention

[0006] The purpose of this invention is to provide a downhole tubing-type long-lasting isolation and production combination tool to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a downhole insertion type long-term isolation production combination tool, including a central tube, a fixing block fixed at an equal angle on the outer side of the upper end of the central tube, the fixing block being fixed to a connector, a sealing mechanism for sealing the production tube being slidably connected to the inner side of the connector, an anchoring mechanism installed on the outer side of the central tube on the lower side of the sealing mechanism for anchoring the device, and a ball seat installed on the lower inner side of the central tube;

[0008] An anti-backflow mechanism is used to prevent backflow when the device is released; the anti-backflow mechanism is installed on the lower end face of the central pipe.

[0009] The cleaning mechanism is used to perform a rotating cleaning action on the inner wall of the production pipe when the device is lowered. The cleaning mechanism is installed outside the anti-backflow mechanism.

[0010] Preferably, the central tube has several liquid inlets at equal angles on the lower outer side, and the liquid inlets are located on the lower side of the ball seat. Through the function of the liquid inlets, a basic guarantee can be provided for the normal operation of subsequent oil production.

[0011] Preferably, the sealing mechanism includes a first movable sleeve that is slidably connected to the inner side of the connector, and the first movable sleeve is fixed to the toothed sleeve. Furthermore, a plurality of sealing rubber tubes are evenly spaced on the side of the toothed sleeve. Through the action of the sealing rubber tubes, a basic guarantee can be provided for the sealing of the production pipe, thereby ensuring the normal operation of the device.

[0012] Preferably, a second movable sleeve is slidably connected to the inner side of the first movable sleeve, and the second movable sleeve is slidably connected to the outer wall of the central tube. The sliding action of the second movable sleeve can provide a basic guarantee for unlocking the first movable sleeve.

[0013] Preferably, the lower side of the second movable sleeve is provided with an installation ring fixed to the outer wall of the central tube, and a first pin is slidably connected to the installation ring. One end of the first pin is nested with the central tube, while the other end of the first pin is fixed to the installation plate. The installation plate is fixed to one end of the first spring, and the other end of the first spring is fixed to the toothed plate. The toothed plate is slidably connected to the installation ring, and the toothed plate and the toothed sleeve form a locking connection. Through the locking action between the toothed plate and the toothed sleeve, a basic locking force can be provided for the first movable sleeve, and through the elastic action of the first spring, the stability of the locking action between the toothed plate and the toothed sleeve can be ensured.

[0014] Preferably, the anchoring mechanism includes a movable inclined ring that contacts the lowermost sealing sleeve, and the movable inclined ring is slidably connected to the mounting sleeve. A slip is slidably connected to the mounting sleeve, and a second spring is fixed between the slip and the mounting sleeve. The inclined surface of the movable inclined ring is slidably connected to the upper inclined surface of the slip, and the lower inclined surface of the slip is slidably connected to the inclined surface of the fixed inclined ring. The fixed inclined ring is fixed to the central tube. The movable inclined ring is driven to move downward by the first movable sleeve. The sliding action between the inclined surface of the movable inclined ring and the upper inclined surface of the slip, and the sliding action between the lower inclined surface of the slip and the inclined surface of the fixed inclined ring, can provide a basic force for the movement of the slip, thereby providing a basic guarantee for locking between the device and the production tube.

[0015] Preferably, the ball seat is locked to the central tube by a second pin, and the strength of the second pin is less than that of the first pin. A guide rod is fixed on the second pin, and a rotatable elastic clip is connected to the guide rod. A torsion spring is also connected between the elastic clip and the guide rod. Through the function of the ball seat, a basic guarantee can be provided for the subsequent device to use steel balls for sealing. Through the function of the elastic clip, a basic guarantee can be provided for the subsequent positioning and locking of the ball seat.

[0016] Preferably, the anti-backflow mechanism includes a connecting sleeve fixed to the lower end of the central tube, and a circular sleeve is provided inside the connecting sleeve. The circular sleeve is nested with the central tube and slides. At the same time, through grooves are opened at equal angles on the circular sleeve. A third spring is fixed between the circular sleeve and the connecting sleeve. The circular sleeve is slidably connected to the guide rod, and the circular sleeve is engaged with the elastic clip. Through the elastic action of the third spring, a basic force can be provided for the reset of the circular sleeve. Through the cooperation and separation between the through groove on the circular sleeve and the liquid inlet, the anti-backflow function can be realized, ensuring the normal operation of the device.

[0017] Preferably, the cleaning mechanism includes a ring slidably connected to the outer side of the connecting sleeve, and sliding rings symmetrically fixed to the inner side of the ring. The sliding rings and the connecting sleeve are slidably connected. As the ring rotates around the connecting sleeve, the sliding guide effect between the sliding rings and the connecting sleeve can ensure the stability of the ring's rotation.

[0018] Preferably, a support plate is fixed at equal angles on the outer side of the ring, and the support plate and the slide plate are slidably connected. The slide plate and the arc panel are fixed to each other, and a high-temperature resistant elastic airbag is fixed between the arc panel and the ring. Rollers are evenly installed on the outer surface of the arc panel, and the rollers are distributed in a spiral shape with a spiral helix angle of 30°-60°. A scraper is also connected to the upper end of the arc panel by a bearing. Through the action of the rollers, a basic guarantee can be provided for the rotation of the ring. Through the sliding action between the support plate and the slide plate, the position of the arc panel can be adjusted to adapt to the use of production pipes of different sizes, so as to better meet the actual use needs.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. This downhole insertion-type long-lasting isolation production combination tool adopts a cleaning mechanism. It converts axial gravity into rotational torque through a combination of spiral distributed rollers. When the tool is lowered, the arc panel is pressed tightly against the pipe wall under the thrust of the airbag. The friction between the spiral roller (30°-60° rise angle) and the pipe wall generates a tangential component force that causes the entire rotating component (ring, arc panel, scraper) to rotate around the central pipe. The scraper rotates accordingly, scraping off the attached material in the circumferential direction. This process continues throughout the entire lowering stroke, realizing the pretreatment of the well wall of the sealing section, and significantly improving the contact quality and working life of the subsequent sealing rubber sleeve and metal slips.

[0021] 2. This downhole insertion-type long-lasting isolation production combination tool uses the same pressure source to control both sealing and anchoring. During initial pressurization, the second movable sleeve is locked by a high-strength first pin. The pressure pushes the first movable sleeve and the toothed sleeve downwards, preferentially compressing the sealing rubber sleeve to achieve initial sealing. After the initial seal is formed, the pressure continues to rise, and the expansion force of the lowest rubber sleeve pushes the movable inclined ring downwards. The double inclined wedge mechanism formed by the inclined ring and the fixed inclined ring converts the axial force into radial force, evenly pushing open multiple slips so that they bite into the pipe wall. Moreover, the anchoring force is positively correlated with the sealing pressure, thus preventing tool creep.

[0022] 3. After the well casing long-term isolation production combination tool is sealed and anchored, the toothed plate rebounds under the action of the spring and is inserted into the toothed sleeve, mechanically locking the setting state to prevent backing after pressure relief. The pressure continues to increase until the low-strength second pin is sheared, and the ball seat moves down, creating conditions for the subsequent activation of the anti-backflow mechanism and the opening of the oil production channel. No external intervention is required, which greatly improves the reliability and consistency of the setting process.

[0023] 4. The core of this downhole tubing-type long-lasting isolating production tool for preventing backflow lies in controlling the opening and closing of the fluid inlet on the central tubing. The circular sleeve inside the connecting sleeve is usually in the upper position under the action of the third spring. At this time, its wall blocks the fluid inlet, and the channel is closed. When producing oil, the push rod on the external oil production head pushes down the locked ball seat and circular sleeve, overcoming the spring force and causing the through groove on the circular sleeve to move down and align with the fluid inlet, thus passively opening the channel. After the oil production head is pulled out, the spring force immediately resets the circular sleeve, and the channel automatically closes, effectively eliminating the risk of backflow when pulling out the tubing string. Moreover, no additional operation is required, resulting in high safety and better meeting the actual use needs. Attached Figure Description

[0024] Figure 1 This is a frontal three-dimensional structural diagram of the overall composition of the device of the present invention;

[0025] Figure 2 This is a front view of the three-dimensional structure of the sealing mechanism of the present invention.

[0026] Figure 3 This is a three-dimensional structural diagram of the mounting ring of the present invention, viewed from the front and cross-sectional perspective.

[0027] Figure 4 This is a frontal cross-sectional three-dimensional structural diagram of the anchoring mechanism of the present invention;

[0028] Figure 5 This is a three-dimensional structural diagram of the ball seat of the present invention, viewed from the front and in cross-section.

[0029] Figure 6 This is a frontal three-dimensional structural diagram of the ball seat of the present invention;

[0030] Figure 7This is a frontal cross-sectional three-dimensional structural diagram of the cleaning mechanism of the present invention.

[0031] In the diagram: 1. Central tube; 101. Liquid inlet; 2. Fixing block; 3. Connector; 4. Sealing mechanism; 401. First movable sleeve; 402. Gear sleeve; 403. Sealing sleeve; 404. Second movable sleeve; 405. Mounting ring; 406. First pin; 407. Mounting plate; 408. First spring; 409. Gear plate; 5. Anchoring mechanism; 501. Movable inclined ring; 502. Mounting sleeve; 503. Slip; 504. Fixing... 505. Fixed inclined surface ring; 6. Second spring; 7. Ball seat; 8. Second pin; 9. Guide rod; 10. Elastic clip; 11. Anti-backflow mechanism; 12. Connecting sleeve; 13. Circular sleeve; 14. Through groove; 15. Third spring; 16. Cleaning mechanism; 17. Circular ring; 18. Slip ring; 19. Support plate; 10. Slide plate; 10. Arc panel; 11. High temperature resistant elastic airbag; 12. Roller; 13. Scraper. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Please see Figures 1-7 The present invention provides a technical solution: a downhole insertion type long-term isolation production combination tool, including a central tube 1, a fixing block 2 fixed at an equal angle on the outer side of the upper end of the central tube 1, the fixing block 2 and the connector 3 being fixed to each other, a sealing mechanism 4 for sealing the production pipe being slidably connected on the inner side of the connector 3, an anchoring mechanism 5 installed on the outer side of the central tube 1 on the lower side of the sealing mechanism 4 for realizing the anchoring function of the device, and a ball seat 6 installed on the lower inner side of the central tube 1;

[0034] The anti-backflow mechanism 7 is used to prevent backflow when the device is released. The anti-backflow mechanism 7 is installed on the lower end face of the central pipe 1.

[0035] The cleaning mechanism 8 is used to achieve the rotational cleaning of the inner wall of the production pipe when the device is lowered. The cleaning mechanism 8 is installed outside the anti-backflow mechanism 7.

[0036] The cleaning mechanism 8 includes a circular ring 801 slidably connected to the outer side of the connecting sleeve 701, and a sliding ring 802 symmetrically fixed to the inner side of the circular ring 801, with the sliding ring 802 and the connecting sleeve 701 being slidably connected; a support plate 803 is fixed at equal angles to the outer side of the circular ring 801, with the support plate 803 and the sliding plate 804 being slidably connected, and the sliding plate 804 and the arc panel 805 being fixed to each other; at the same time, a high-temperature resistant elastic airbag 806 is fixed between the arc panel 805 and the circular ring 801; rollers 807 are evenly installed on the outer surface of the arc panel 805, and the rollers 807 are distributed in a spiral shape, with the spiral angle of the rollers 807 being 30°-60°; a scraper 808 is also connected to the upper end of the arc panel 805 by a bearing.

[0037] When using this downhole insertion-type long-lasting isolating production tool, such as Figures 1-7 As shown, the oil pipe and connector 3 are first connected and fixed together by threads. Then, the entire device is sent into the production pipe through the oil pipe. With the elastic effect of the high-temperature resistant elastic airbag 806 and the inclined structure of the lower end face of the arc panel 805 and the sliding action between the support plate 803 and the slide plate 804, the position of the arc panel 805 can be adaptively adjusted to ensure that the roller 807 and scraper 808 are in contact with the inner wall of the production pipe. When the device moves down in the production pipe, the roller 807 is driven to rotate by gravity and the spirally distributed roller 807 as it slides down the inner wall of the production pipe. With the sliding action between the slip ring 802 and the connecting sleeve 701, the rotation stability of the arc panel 805, scraper 808 and ring 801 can be ensured. Moreover, the rotation of the scraper 808 can remove residual impurities and foreign objects from the inner wall of the production pipe, so as to avoid the sealing effect of the device being affected by the presence of impurities and foreign objects.

[0038] Several liquid inlets 101 are provided at equal angles on the lower outer side of the central tube 1, and the liquid inlets 101 are located on the lower side of the ball seat 6; the sealing mechanism 4 includes a first movable sleeve 401 slidably connected to the inner side of the connector 3, and the first movable sleeve 401 is fixed to the retaining sleeve 402, and several sealing rubber cylinders 403 are provided at equal intervals on the side of the retaining sleeve 402; a second movable sleeve 404 is slidably connected to the inner side of the first movable sleeve 401, and the second movable sleeve 404 is slidably connected to the outer wall of the central tube 1; a fixed... A mounting ring 405 is fixed to the outer wall of the central tube 1, and a first pin 406 is slidably connected to the mounting ring 405. One end of the first pin 406 is nested with the central tube 1, while the other end of the first pin 406 is fixed to the mounting plate 407. The mounting plate 407 is fixed to one end of the first spring 408, and the other end of the first spring 408 is fixed to the toothed plate 409. The toothed plate 409 is slidably connected to the mounting ring 405, and the toothed plate 409 and the toothed sleeve 402 are engaged.

[0039] After the entire device moves to the preset position, such as Figures 1-7 As shown, a steel ball is dropped into the central tube 1 through an oil pipe. Under the action of its own weight, the steel ball cooperates with the ball seat 6 to achieve the sealing effect of the ball seat 6. Then, pressure (air pressure or hydraulic pressure) is injected into the connector 3 through the oil pipe. At this time, since the ball seat 6 is sealed, the pressure on the upper side of the ball seat 6 begins to increase. At this time, since the second movable sleeve 404 is locked to the central tube 1 by the first pin 406, the second movable sleeve 404 will not move under pressure. However, the first movable sleeve 401 begins to move downward under air pressure, which simultaneously drives the toothed sleeve 402 to move downward. By moving the toothed sleeve 402 downward, the sealing rubber cylinder 403 can be squeezed, causing the sealing rubber cylinder 403 to expand under pressure and contact the inner wall of the production tube, thereby achieving the sealing effect of the production tube. When the toothed sleeve 402 moves downward, the elastic action of the first spring 408 can separate the toothed plate 409 from the toothed sleeve 402, ensuring the normal operation of the toothed sleeve 402 downward.

[0040] The anchoring mechanism 5 includes a movable inclined ring 501 that contacts the lowermost sealing rubber cylinder 403, and the movable inclined ring 501 is slidably connected to the mounting sleeve 502. A slip 503 is slidably connected to the mounting sleeve 502, and a second spring 505 is fixed between the slip 503 and the mounting sleeve 502. The inclined surface of the movable inclined ring 501 is slidably connected to the upper inclined surface of the slip 503, and the lower inclined surface of the slip 503 is slidably connected to the inclined surface of the fixed inclined ring 504. The fixed inclined ring 504 is fixed to the central tube 1.

[0041] When the toothed sleeve 402 moves downward, causing the sealing rubber sleeve 403 to expand, as Figures 1-7 As shown, as the pressure increases, the bottom sealing sleeve 403 simultaneously exerts a force on the movable inclined ring 501, causing the movable inclined ring 501 to slide downward relative to the central tube 1. Combined with the sliding action between the movable inclined ring 501, the fixed inclined ring 504, and the slip 503, the slip 503 can be moved outward from the mounting sleeve 502 under force. Combined with the sliding action between the slip 503 and the mounting sleeve 502, the stability of the movement of the slip 503 can be ensured until the slip 503 contacts the inner wall of the production tube and generates a certain pressure, thus achieving the anchoring effect between the entire device and the production tube, thereby ensuring the stability of the entire device. Furthermore, as the pressure continues to increase, the anchoring force between the slip 503 and the inner wall of the production tube and the sealing effect between the sealing sleeve 403 and the inner wall of the production tube can be guaranteed.

[0042] The ball seat 6 is locked to the central tube 1 by the second pin 601, and the strength of the second pin 601 is less than that of the first pin 406. A guide rod 602 is fixed on the second pin 601, and a rotatable elastic clip 603 is connected to the guide rod 602. A torsion spring is also connected between the elastic clip 603 and the guide rod 602. The anti-backflow mechanism 7 includes a connecting sleeve 701 fixed to the lower end of the central tube 1. A circular sleeve 702 is provided on the inner side of the connecting sleeve 701. The circular sleeve 702 is nested with the central tube 1 and slides. A through groove 703 is opened at equal angles on the circular sleeve 702. A third spring 704 is fixed between the circular sleeve 702 and the connecting sleeve 701. The circular sleeve 702 is slidably connected to the guide rod 602, and the circular sleeve 702 is engaged with the elastic clip 603.

[0043] After the device and production pipe are anchored and sealed, such as Figures 1-7 As shown, at this time, the first spring 408 can engage the toothed plate 409 with the toothed sleeve 402 to ensure the stability of the device. By continuing to increase the pressure, the pressure on the ball seat 6 increases. When the pressure is greater than the shearing force of the second pin 601, the second pin 601 can break under the pressure, causing the ball seat 6 to move downward. Combined with the sliding action between the guide rod 602 and the round sleeve 702, the stability of the movement of the ball seat 6 can be ensured. When the elastic clip 603 moves to contact the round hole on the round sleeve 702, the elastic clip 603 can retract into the guide rod 602. When the elastic clip 603 moves to the lower side of the round sleeve 702, the torsion spring can make the elastic clip 603 spring open, thereby locking the ball seat 6 and the round sleeve 702 to prevent the ball seat 6 from being lost, thus completing the installation, anchoring and sealing function of the device.

[0044] After the device is installed, such as Figures 1-7 As shown, by disengaging the oil pipe from the connector 3, the elastic action of the third spring 704 causes the through groove 703 on the sleeve 702 to be separated from the inlet 101. This effectively prevents backflow of crude oil when the oil pipe is disengaged from the connector 3. During oil extraction, the oil extraction head is connected to the connector 3. By installing a push rod at the end of the oil extraction head, the push rod can contact the ball seat 6 and generate pressure after the oil extraction head is connected to the connector 3. Since the ball seat 6 is locked to the sleeve 702 by the elastic clip 603, the sleeve 702 can be moved downward under the action of the push rod, thereby aligning the through groove 703 on the sleeve 702 with the inlet 101 for oil extraction operation.

[0045] After oil extraction is completed, when it is necessary to remove the entire unit, such as... Figures 1-7As shown, by separating the oil extraction head from the connector 3, the through groove 703 is separated from the inlet 101 under the action of the third spring 704, and the oil pipe is brought into contact with the connector 3 and pressurized. As the internal pressure of the device increases, when the pressure exceeds the shearing force of the first pin 406, the first pin 406 breaks under force, causing the second movable sleeve 404 to move downward under force. Due to the breakage of the first pin 406, the supporting effect on the mounting plate 407 and the toothed plate 409 is released. At this time, through the elastic action of the sealing sleeve 403 and the second spring 505, the sealing sleeve 403 and the slip 503 can be separated from the inner wall of the production pipe, thereby contacting the anchoring and sealing effect of the device. Finally, the device can be moved out of the production pipe through the oil pipe.

[0046] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0047] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only for the purpose of helping to understand the method and core ideas of the present invention. The above descriptions are only preferred embodiments of the present invention. It should be noted that due to the limitations of textual expression, while there are objectively infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of the present invention.

Claims

1. A downhole tubing-type long-lasting isolating production combination tool, comprising a central tube (1), characterized in that: A fixing block (2) is fixed at an equal angle on the outer side of the upper end of the central tube (1). The fixing block (2) is fixed to the connector (3). A sealing mechanism (4) for sealing the production tube is slidably connected to the inner side of the connector (3). An anchoring mechanism (5) installed on the outer side of the central tube (1) is provided on the lower side of the sealing mechanism (4) to realize the anchoring function of the device. A ball seat (6) is installed on the lower inner side of the central tube (1). An anti-backflow mechanism (7) is used to prevent backflow when the device is released. The anti-backflow mechanism (7) is installed on the lower end face of the central tube (1). The cleaning mechanism (8) is used to achieve the rotational cleaning effect on the inner wall of the production pipe when the device is lowered. The cleaning mechanism (8) is installed on the outside of the anti-backflow mechanism (7). The sealing mechanism (4) includes a first movable sleeve (401) slidably connected to the inner side of the connector (3), and the first movable sleeve (401) is fixed to the retaining sleeve (402). A plurality of sealing rubber cylinders (403) are evenly spaced on the side of the retaining sleeve (402). A second movable sleeve (404) is slidably connected to the inner side of the first movable sleeve (401), and the second movable sleeve (404) is slidably connected to the outer wall of the central tube (1). A mounting ring (405) fixed to the outer wall of the central tube (1) is provided on the lower side of the second movable sleeve (404). A first pin (406) is slidably connected to the mounting ring (405), and one end of the first pin (406) is nested with the central tube (1). At the same time, the other end of the first pin (406) is fixed to the mounting plate (407). The mounting plate (407) is fixed to one end of the first spring (408), and the other end of the first spring (408) is fixed on the toothed plate (409). The toothed plate (409) is slidably connected to the mounting ring (405), and the toothed plate (409) and the toothed sleeve (402) are engaged.

2. The downhole insertion-type long-term isolation production combination tool according to claim 1, characterized in that: The central tube (1) has several liquid inlets (101) at equal angles on the lower outer side, and the liquid inlets (101) are located on the lower side of the ball seat (6).

3. The downhole insertion-type long-term isolation production combination tool according to claim 1, characterized in that: The anchoring mechanism (5) includes a movable inclined ring (501) that contacts the lowermost sealing rubber cylinder (403), and the movable inclined ring (501) is slidably connected to the mounting sleeve (502). A slip (503) is slidably connected to the mounting sleeve (502), and a second spring (505) is fixed between the slip (503) and the mounting sleeve (502). The inclined surface of the movable inclined ring (501) is slidably connected to the upper inclined surface of the slip (503), and the lower inclined surface of the slip (503) is slidably connected to the inclined surface of the fixed inclined ring (504). The fixed inclined ring (504) is fixed to the central tube (1).

4. The downhole insertion-type long-term isolation production combination tool according to claim 1, characterized in that: The ball seat (6) is locked to the center tube (1) by the second pin (601), and the strength of the second pin (601) is less than that of the first pin (406). A guide rod (602) is fixed on the second pin (601), and a rotatable elastic clip (603) is connected to the guide rod (602). A torsion spring is also connected between the elastic clip (603) and the guide rod (602).

5. The downhole insertion-type long-term isolation production combination tool according to claim 1, characterized in that: The anti-backflow mechanism (7) includes a connecting sleeve (701) fixed to the lower end of the central tube (1), and a circular sleeve (702) is provided inside the connecting sleeve (701). The circular sleeve (702) is nested with the central tube (1) and slides. At the same time, a through groove (703) is opened at an equal angle on the circular sleeve (702). A third spring (704) is fixed between the circular sleeve (702) and the connecting sleeve (701). The circular sleeve (702) is slidably connected to the guide rod (602), and the circular sleeve (702) is engaged with the elastic clip (603).

6. The downhole insertion-type long-term isolation production combination tool according to claim 5, characterized in that: The cleaning mechanism (8) includes a ring (801) slidably connected to the outer side of the connecting sleeve (701), and a sliding ring (802) is symmetrically fixed on the inner side of the ring (801), and the sliding ring (802) and the connecting sleeve (701) are slidably connected.

7. A downhole insertion-type long-term isolation production combination tool according to claim 6, characterized in that: A support plate (803) is fixed at equal angles on the outer side of the ring (801), and the support plate (803) is slidably connected to the slide plate (804). The slide plate (804) is fixed to the arc panel (805), and a high-temperature resistant elastic airbag (806) is fixed between the arc panel (805) and the ring (801). Rollers (807) are evenly installed on the outer surface of the arc panel (805), and the rollers (807) are distributed in a spiral shape. The spiral angle of the rollers (807) is 30°-60°. A scraper (808) is also connected to the upper end of the arc panel (805) by a bearing.

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