A high-temperature resistant and recyclable downhole packer

Abstract

The present invention discloses a high-temperature-resistant recoverable downhole packer, which comprises a first assembled housing. The inner wall of the first assembled housing is fixedly connected with a second assembled housing. An oil delivery pipe is movably connected to the inner wall of the second assembled housing. A slip portion is arranged on the outer wall of the second assembled housing. A plurality of plugging rubber cylinders, high-temperature-resistant rubber cylinders and plugging plates are fixedly connected to the bottom outer wall of the slip portion. Among them, the slip portion is divided into an anchoring structure and a plugging structure. In the present invention, after the present invention is lowered to a predetermined pumping position in the oil well, the plugging rubber cylinder and the high-temperature-resistant rubber cylinder are pressurized to complete the layered plugging of the downhole channel. And the anchoring structure can be synchronously deployed to tighten and fix the present invention in the downhole channel, which can prevent the loosening of the present invention in the downhole channel caused by vibration during oil pumping. And after the anchoring structure is fixed, a secondary layered plugging is formed in cooperation with the plugging structure to further enhance the structural stability of the present invention.

Description

Technical Field

[0001] The invention belongs to the technical field of packers, and in particular relates to a high-temperature resistant and recyclable downhole packer. Background Art

[0002] Downhole packer refers to a downhole tool connected to the downhole pipe string, used to isolate the annular space between the oil pipe and the oil and gas well casing or the open hole wall. It uses external force to shorten the length of the rubber tube and enlarge the diameter to seal the oil and annular space, separate the upper and lower oil (gas, water) layers of the packer, and thus realize the layered testing, layered oil production, layered transformation and water layer plugging of oil and water wells. It is widely used in drilling, cementing, testing, and completion, and can be used for oil and gas well production, water (gas) injection, interlayer isolation, separate injection and production, multi-layer testing, and production enhancement operations.

[0003] For example, the national patent publication number CN113236178A discloses a high-temperature and pressure-resistant oil drill using a packer, which includes a first assembly tube, the lower end of which is fixedly connected to a rubber tube, the upper end of which is slidably connected to a pressure tube, the bottom end of which is equipped with a pressure-bearing deformation member, a support ring is provided between the pressure-bearing deformation member and the rubber tube, the support ring has deformability, so that it can fit the rubber tube more closely, thereby improving the sealing of the rubber tube, and after the pressure-bearing deformation member is deformed, the elastic body inside the support ring drives the support plate and the inner slide plate to unfold, and after the support plate and the inner slide plate are unfolded, the diameter of the support ring expands, thereby driving the rubber tube to expand and deform along the folding groove of the rubber tube, thereby fixing the rubber tube.

[0004] However, the conventional device still has the following problems when used:

[0005] Traditional packers are usually fixed by supporting structures directly against the inner wall of the downhole channel. When the wellbore pump vibrates up and down, the packer may loosen and slip, affecting the airtightness. The stability of the supporting structure needs to be strengthened. Summary of the invention

[0006] In view of the deficiencies in the prior art, the object of the present invention is to provide a high temperature resistant and retrievable downhole packer, which has the advantages of further improving the stability of the supporting structure and the overall airtightness.

[0007] To achieve the above object, the present invention provides the following technical solution: a high-temperature resistant and recyclable downhole packer, including a first assembled housing, wherein the inner wall of the first assembled housing is fixedly connected with a second assembled housing, the inner wall of the second assembled housing is movably connected with an oil delivery pipe, the outer wall of the second assembled housing is provided with a slip part, and the bottom outer wall of the slip part is fixedly connected with a plurality of plugging rubber cylinders, high-temperature resistant rubber cylinders and plugging plates. Among them, the slip part is divided into an anchoring structure and a plugging structure. The anchoring structure includes a sealing ring, multiple groups of anchoring plates, a pressing plate, a connecting bracket, a multi-stage threaded sleeve rod and a limiting roller. The plugging structure includes an elastic sealing rubber cylinder and an elastic folding rubber ring.

[0008] Preferably, the second assembled housing includes a pressure application sleeve and a protection pipe. The inner wall of the sealing ring is movably connected with the outer wall of the protection pipe. One side outer walls of multiple groups of connecting brackets are respectively fixedly connected with the outer walls around the protection pipe. The top outer walls of multiple pressing plates are fixedly connected with the bottom outer wall of the sealing ring. The outer walls around the pressing plate are slidably connected with the inner walls of the connecting brackets. One end outer wall of the multi-stage threaded sleeve rod is fixedly connected with the outer wall of the pressing plate. The end outer wall of the multi-stage threaded sleeve rod far from the pressing plate is fixedly connected with the inner shaft sleeve of the limiting roller. Multiple groups of counterclockwise threaded grooves are formed in the inner walls of the anchoring plates. The inner walls of the counterclockwise threaded grooves are movably connected with the outer walls of the limiting rollers. Limiting clamping grooves are formed in the inner walls of the counterclockwise threaded grooves. The inner walls of the limiting clamping grooves are in limiting clamping connection with the outer walls of the limiting rollers.

[0009] Preferably, clockwise threaded grooves are formed in the outer walls of the anchoring plates. The clockwise threaded grooves on the outer walls of multiple groups of anchoring plates are mutually coherent patterns. The counterclockwise threaded grooves in the inner walls of multiple groups of anchoring plates are mutually coherent patterns. The heights of multiple multi-stage threaded sleeve rods on the pressing plate are different, and the heights of the counterclockwise threaded grooves on the opposite sides are horizontal.

[0010] Preferably, a connecting bearing is fixedly connected to the outer wall of the protection pipe. The inner shaft sleeve of the connecting bearing is fixedly connected with the outer wall of the protection pipe. The top outer wall of the outer shaft sleeve of the connecting bearing is fixedly connected with a receiving base. Multiple limiting guide rails are formed in the top outer wall of the receiving base. A fixing block is fixedly connected to the bottom outer wall of the anchoring plate. A sliding block is fixedly connected to the bottom outer wall of the fixing block. The outer wall of the sliding block is slidably connected with the inner wall of the limiting guide rail.

[0011] Preferably, the outer walls on both sides of the elastic folding rubber ring are respectively fixedly connected with the outer walls on one side of the adjacent anchoring plates. The outer walls of the anchoring plates and the elastic folding rubber ring are both fixedly connected with the elastic sealing rubber cylinder. The top outer walls of the anchoring plates and the elastic folding rubber ring are fixedly connected with the bottom outer wall of the sealing ring through the elastic sealing rubber cylinder.

[0012] Preferably, the oil pipeline includes a pipe body and a retaining end. A first installation channel is provided on the outer wall of the top of the first assembly housing. The outer wall of the retaining end is movably connected to the inner wall of the first installation channel. A second installation channel is provided on the outer wall of the bottom of the first installation channel. The outer wall of the pipe body is movably connected to the inner wall of the second installation channel. An installation inner cavity is provided on the outer wall of the bottom of the first assembly housing. The outer wall of the second assembly housing is fixedly connected to the inner wall of the installation inner cavity.

[0013] Preferably, the outer wall of the pipe body is movably connected to the inner wall of the protective pipe. A hydraulic cavity is provided on the outer wall of the bottom of the pressure application sleeve. A bottom plate is provided on the inner wall of the hydraulic cavity. A sealing rubber pad is fixedly connected to the outer wall of the top of the bottom plate. The outer wall of the sealing rubber pad is slidably connected to the inner wall of the hydraulic cavity. A graphite ring plate is fixedly connected to the outer wall of the bottom of the bottom plate. The outer wall of the bottom of the graphite ring plate is movably connected to the outer wall of the top of the sealing connecting ring. Communication holes are provided on both outer walls of the first assembly housing. A placement cavity is provided on the inner wall of the first assembly housing. A first hydraulic pipe is fixedly connected to the inner wall of the communication hole. One end of the inner wall of the first hydraulic pipe is connected to the inner wall of the hydraulic cavity through the pressure application sleeve. A first regulating valve is fixedly connected to the outer wall of the first hydraulic pipe.

[0014] Preferably, both the pressure application sleeve and the bottom plate are in a "C" shape to form a through channel.

[0015] Preferably, a second hydraulic pipe communicating with the inner wall of the elastic sealing rubber cylinder is fixedly connected to the outer wall of the first assembly housing through the communication hole and the through channel. A second regulating valve is fixedly connected to the outer wall of the second hydraulic pipe.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] In the present invention, after the present invention is lowered to the predetermined pumping position of the oil well, the layered plugging of the downhole channel is completed by pressurizing the plugging rubber cylinder and the high-temperature resistant rubber cylinder, and the anchoring structure can be simultaneously deployed to tighten and fix the present invention in the downhole channel, which can prevent the loosening of the present invention in the downhole channel caused by vibration during pumping, ensure the stability of the anchoring structure, and after the anchoring structure is fixed, a secondary layered plugging is formed in cooperation with the plugging structure to further enhance the structural stability of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 is a schematic diagram of the internal structure of the first assembly housing of the present invention;

[0020] Figure 3 is a schematic diagram of the internal structure of the second assembly housing of the present invention;

[0021] Figure 4 It is a schematic diagram of the upper left structure inside the second assembly housing of the present invention;

[0022] Figure 5 It is a schematic diagram of the internal structure of the placement chamber of the present invention;

[0023] Figure 6 It is a schematic diagram of the internal structure of the anchor plate of the present invention;

[0024] Figure 7 It is a schematic diagram of the structure of the multi-stage threaded sleeve rod of the present invention;

[0025] Figure 8 It is a schematic diagram of the structure explosion of the present invention;

[0026] Figure 9 It is a schematic diagram of the explosion of the half-section structure of the present invention.

[0027] In the figure:

[0028] 1. First assemble the shell;

[0029] 11. First installation channel; 12. Second installation channel; 13. Placement cavity; 14. Installation inner cavity; 15. Communication hole; 16. Second hydraulic pipe; 17. Second regulating valve;

[0030] 2. Second assembly shell;

[0031] 211, bottom plate; 212, sealing rubber pad; 213, graphite ring plate; 22, pressure sleeve; 23, protection pipe; 24, hydraulic chamber; 251, first hydraulic pipe; 252, first regulating valve;

[0032] 3. Oil pipeline;

[0033] 31. Pipe body; 32. Retention end;

[0034] 4. Kava Department;

[0035] 41. Sealing chain; 421. Elastic sealing rubber tube; 422. Elastic folding rubber ring; 43. Anchor plate; 431. Counterclockwise thread groove; 432. Limiting card slot; 44. Pressing plate; 45. Connecting bracket; 461. Multi-stage thread sleeve rod; 462. Limiting roller; 47. Connecting bearing; 48. Undertaking base; 491. Fixed block; 492. Sliding block;

[0036] 5. Sealing rubber cylinder; 6. High temperature resistant rubber cylinder; 7. Sealing partition plate. DETAILED DESCRIPTION

[0037] In order to clearly and completely describe the objectives, technical solutions of the present invention, and make the advantages more clearly understood, the following further details the embodiments of the present invention with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, rather than all of the embodiments, and are only used to explain the embodiments of the present invention, not to limit the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention. Embodiment

[0038] Please refer to Figures 1 to 9 , the present invention provides a technical solution: a high-temperature-resistant recyclable downhole packer, including a first assembled housing 1, characterized in that: the inner wall of the first assembled housing 1 is fixedly connected with a second assembled housing 2, the inner wall of the second assembled housing 2 is movably connected with an oil delivery pipe 3, the outer wall of the second assembled housing 2 is provided with a slip part 4, and the bottom outer wall of the slip part 4 is fixedly connected with a plurality of plugging rubber cylinders 5, high-temperature-resistant rubber cylinders 6 and plugging plates 7. Among them, the slip part 4 is divided into an anchoring structure and a plugging structure. The anchoring structure includes a sealing link 41, multiple groups of anchoring plates 43, a pressing plate 44, a connecting bracket 45, a multi-stage threaded sleeve rod 461 and a limiting roller 462. The plugging structure includes an elastic sealing rubber cylinder 421 and an elastic folding rubber ring 422.

[0039] In the present invention, after the present invention is lowered to the predetermined pumping position of the oil well, the layered plugging of the downhole channel is completed by pressurizing the plugging rubber cylinder 5 and the high-temperature-resistant rubber cylinder 6, and the anchoring structure can be simultaneously deployed to tighten and fix the present invention in the downhole channel, which can prevent the loosening of the present invention in the downhole channel caused by vibration during pumping, ensure the stability of the anchoring structure, and after the anchoring structure is fixed, cooperate with the plugging structure to form a secondary layered plugging, further strengthening the structural stability of the present invention. Embodiment

[0040] On the basis of the first embodiment, the second assembly housing 2 includes a pressure sleeve 22 and a protective tube 23. The inner wall of the sealing ring 41 is movably connected to the outer wall of the protective tube 23. One side outer walls of multiple connecting brackets 45 are respectively fixedly connected to the outer walls around the protective tube 23. The top outer walls of multiple pressing plates 44 are fixedly connected to the bottom outer wall of the sealing ring 41. The outer walls around the pressing plates 44 are slidably connected to the inner walls of the connecting brackets 45. One end outer wall of a multi-stage threaded sleeve rod 461 is fixedly connected to the outer wall of the pressing plate 44. The end outer wall of the multi-stage threaded sleeve rod 461 away from the pressing plate 44 is fixedly connected to the inner bushing of a limit roller 462. Counterclockwise threaded grooves 431 are formed in the inner walls of multiple anchoring plates 43. The inner wall of the counterclockwise threaded groove 431 is movably connected to the outer wall of the limit roller 462. A limit card slot 432 is formed in the inner wall of the counterclockwise threaded groove 431. The inner wall of the limit card slot 432 is in limit clamping connection with the outer wall of the limit roller 462. A clockwise threaded groove is formed in the outer wall of the anchoring plate 43. The clockwise threaded grooves on the outer walls of multiple anchoring plates 43 are coherent patterns. The counterclockwise threaded grooves 431 in the inner walls of multiple anchoring plates 43 are coherent patterns. The heights of multiple multi-stage threaded sleeve rods 461 on the pressing plate 44 are different and are horizontal with the height of the counterclockwise threaded groove 431 on the opposite side. A connecting bearing 47 is fixedly connected to the outer wall of the protective tube 23. The inner bushing of the connecting bearing 47 is fixedly connected to the outer wall of the protective tube 23. The top outer wall of the outer bushing of the connecting bearing 47 is fixedly connected to a receiving base 48. Multiple limit guide rails are formed in the top outer wall of the receiving base 48. A fixing block 491 is fixedly connected to the bottom outer wall of the anchoring plate 43. A slider 492 is fixedly connected to the bottom outer wall of the fixing block 491. The outer wall of the slider 492 is slidably connected to the inner wall of the limit guide rail.

[0041] In the present invention, when the pressing plate 44 moves downward, it will drive the multi-stage threaded sleeve rod 461 and the limit roller 462 to move downward synchronously. Since the counterclockwise threaded groove 431 of the anchoring plate 43 has a certain inclination angle, the downward pressing force of the limit roller 462 on the inner wall of the counterclockwise threaded groove 431 will cause the limit roller 462 to roll and drive the anchoring plate 43 to rotate reversely. At the same time, since the rolling of the limit roller 462 drives the multi-stage threaded sleeve rod 461 to rotate, the multi-stage threaded sleeve rod 461 extends out by rotation, pushing the anchoring plate 43 to extend outward. In this way, the anchoring plate 43 is pushed to the position of the underground passage and abuts against it. At the same time, the outward extension of the anchoring plate 43 combined with its own reverse rotation enables the anchoring plate 43 to be screwed tightly along the thread on the inner wall of the underground passage. By setting the thread tightening, the present invention further tightens the thread while abutting, embedding the anchoring plate 43 into the inner wall of the underground passage, being able to effectively resist vibration during vibration and not being easily loosened, and having a better stabilizing effect. Embodiment

[0042] On the basis of the second embodiment, the outer wall of the tube body 31 is movably connected to the inner wall of the protective tube 23, the bottom outer wall of the pressure sleeve 22 is provided with a hydraulic chamber 24, the inner wall of the hydraulic chamber 24 is provided with a bottom plate 211, the top outer wall of the bottom plate 211 is fixedly connected with a sealing rubber pad 212, the outer wall of the sealing rubber pad 212 is slidably connected to the inner wall of the hydraulic chamber 24, the bottom outer wall of the bottom plate 211 is fixedly connected with a graphite ring plate 213, the bottom outer wall of the graphite ring plate 213 is connected to the top of the sealing link 41, and the bottom outer wall of the bottom plate 211 is fixedly connected with a graphite ring plate 213. The outer walls of the first assembly shell 1 are movably connected, connecting holes 15 are opened on the outer walls on both sides, and a placement cavity 13 is opened on the inner wall of the first assembly shell 1. The inner wall of the connecting hole 15 is fixedly connected to the first hydraulic pipe 251, and the inner wall of one end of the first hydraulic pipe 251 is connected to the inner wall of the hydraulic cavity 24 through the pressure sleeve 22. The outer wall of the first hydraulic pipe 251 is fixedly connected to the first regulating valve 252, and the pressure sleeve 22 and the bottom plate 211 are both "C"-shaped structures to form a through channel.

[0043] Hydraulic oil is pumped into the hydraulic chamber 24 through the first hydraulic pipe 251. The bottom plate 211 is pressed and pushed downward along the inner wall of the hydraulic chamber 24. The graphite ring plate 213 presses against the sealing link 41 to drive the pressing plate 44 to be pressed downward, thereby completing the extension and pushing of the anchor plate 43. Example

[0044] On the basis of Example 3, the outer walls of both sides of the elastic folded rubber ring 422 are fixedly connected to the outer wall of one side of the adjacent side anchoring plate 43, the outer walls of the anchoring plate 43 and the elastic folded rubber ring 422 are fixedly connected to the elastic sealing rubber tube 421, and the top outer walls of the anchoring plate 43 and the elastic folded rubber ring 422 are fixedly connected to the bottom outer wall of the sealing link 41 through the elastic sealing rubber tube 421. The oil pipeline 3 includes a tube body 31 and a fixed end 32. A first installation channel 11 is opened on the top outer wall of the first assembly shell 1. The outer wall of the fixed end 32 is movably connected to the inner wall of the first installation channel 11. A second installation channel 12 is opened on the bottom outer wall of the first installation channel 11. The outer wall of the tube body 31 is movably connected to the inner wall of the second installation channel 12. An installation inner cavity 14 is opened on the bottom outer wall of the first assembly shell 1. The outer wall of the second assembly shell 2 is fixedly connected to the inner wall of the installation inner cavity 14. The outer wall of the first assembly shell 1 is fixedly connected to a second hydraulic pipe 16 connected to the inner wall of the elastic sealing rubber cylinder 421 through a connecting hole 15 and a through-channel. The outer wall of the second hydraulic pipe 16 is fixedly connected to a second regulating valve 17.

[0045] In the present invention, the "C"-shaped pressing sleeve 22 structure reserves an installation channel for the second hydraulic pipe 16. The elastic sealing rubber cylinder 421 and the elastic folding rubber ring 422 have a certain resilience toughness. When the anchoring plate 43 extends, hydraulic oil is injected into the internal extension cavity of the anchoring plate 43 through the second hydraulic pipe 16. The amount of this hydraulic oil can ensure that the elastic stretching of the elastic sealing rubber cylinder 421 and the elastic folding rubber ring 422 can be satisfied. After the anchoring plate 43 is completely fixed in the underground channel, the elastic folding rubber ring 422 can also resist against the inner wall of the underground channel. Through this sealing structure combined with the anchoring structure, the secondary sealing of the underground channel is completed, further strengthening the overall stability of the present invention. When the present invention needs to be recovered, only by recovering the hydraulic oil at all levels through the second hydraulic pipe 16 and the first hydraulic pipe 251, the present invention can be loosened from the underground channel for recovery.

[0046] Working principle and usage process of the present invention: In the present invention, after the present invention is lowered to the predetermined pumping position of the oil well, the layered plugging of the downhole channel is completed by pressurizing the plugging rubber cylinder 5 and the high-temperature resistant rubber cylinder 6, and the anchoring structure can be simultaneously deployed to tighten and fix the present invention in the downhole channel, which can prevent loosening of the present invention in the downhole channel caused by vibration during pumping, ensure the stability of the support structure, and after the anchoring structure is fixed, cooperate with the plugging structure to form a secondary layered plugging, further strengthening the structural stability of the present invention. In the present invention, when the pressing plate 44 moves downward, it will drive the multi-stage threaded sleeve rod 461 and the limiting roller 462 to move downward synchronously. Since the counterclockwise threaded groove 431 of the anchoring plate 43 has a certain inclination angle, the downward pressing force of the limiting roller 462 on the inner wall of the counterclockwise threaded groove 431 will cause the limiting roller 462 to roll and drive the anchoring plate 43 to rotate reversely. At the same time, since the rolling of the limiting roller 462 drives the multi-stage threaded sleeve rod 461 to rotate, the multi-stage threaded sleeve rod 461 rotates out and extends, pushing the anchoring plate 43 to extend outward. In this way, the anchoring plate 43 is pushed to the position of the downhole channel and abuts against it. At the same time, the outward extension of the anchoring plate 43 combined with its own reverse rotation enables the anchoring plate 43 to be screwed tightly along the thread on the inner wall of the downhole channel. By setting the thread tightening, the present invention is further tightened by threading while abutting, embedding the anchoring plate 43 into the inner wall of the downhole channel, being able to effectively resist vibration during vibration and not being easily loosened, having a better stabilizing effect. By pumping hydraulic oil into the hydraulic cavity 24 through the first hydraulic pipe 251, the bottom plate 211 is pushed downward along the inner wall of the hydraulic cavity 24 after being pressurized, and the graphite ring plate 213 abuts against the sealing link 41 to drive the pressing plate 44 to press down, completing the extension and pushing of the anchoring plate 43. In the present invention, the "C"-shaped pressure sleeve 22 structure reserves an installation channel for the second hydraulic pipe 16. The elastic sealing rubber cylinder 421 and the elastic folding rubber ring 422 have a certain resilience. When the anchoring plate 43 extends, hydraulic oil is injected into the inner extension cavity of the anchoring plate 43 through the second hydraulic pipe 16. This amount of hydraulic oil can ensure the elastic extension of the elastic sealing rubber cylinder 421 and the elastic folding rubber ring 422. After the anchoring plate 43 is completely fixed in the downhole channel, the elastic folding rubber ring 422 can also abut against the inner wall of the downhole channel. Through this plugging structure combined with the anchoring structure, the secondary sealing of the downhole channel is completed, further strengthening the overall stability of the present invention. When the present invention needs to be recovered, only by recovering the hydraulic oil at all levels through the second hydraulic pipe 16 and the first hydraulic pipe 251, the present invention can be loosened from the downhole channel for recovery.

[0047] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high temperature resistant retrievable downhole packer, comprising a first assembly shell (1), characterized in that: The inner wall of the first assembly shell (1) is fixedly connected to the second assembly shell (2), the inner wall of the second assembly shell (2) is movably connected to the oil pipeline (3), the outer wall of the second assembly shell (2) is provided with a slip portion (4), the bottom outer wall of the slip portion (4) is fixedly connected to a plurality of sealing rubber cylinders (5) and high temperature resistant rubber cylinders (6) and a sealing plate (7), wherein the slip portion (4) is divided into an anchoring structure and a sealing structure, the anchoring structure comprises a sealing chain (41), a plurality of anchoring plates (43), a pressing plate (44), a connecting bracket (45), a multi-stage threaded sleeve rod (461) and a limiting roller (462), and the sealing structure comprises an elastic sealing rubber cylinder (421) and an elastic folding rubber ring (422); The second assembly shell (2) includes a pressure sleeve (22) and a protective tube (23); the inner wall of the sealing link (41) is movably connected to the outer wall of the protective tube (23); the outer walls of one side of the plurality of connecting brackets (45) are respectively fixedly connected to the outer walls of the surrounding areas of the protective tube (23); the top outer walls of the plurality of pressing plates (44) are fixedly connected to the bottom outer walls of the sealing link (41); the outer walls of the surrounding areas of the pressing plates (44) are slidably connected to the inner wall of the connecting bracket (45); the outer wall of one end of the multi-stage threaded sleeve (461) is connected to the pressing plate (461); The outer wall of the pressure plate (44) is fixedly connected, the outer wall of one end of the multi-stage threaded sleeve (461) away from the pressure plate (44) is fixedly connected to the inner sleeve of the limiting roller (462), the inner walls of the plurality of groups of anchor plates (43) are provided with counterclockwise thread grooves (431), the inner walls of the counterclockwise thread grooves (431) are movably connected to the outer wall of the limiting roller (462), the inner walls of the counterclockwise thread grooves (431) are provided with limiting clamping grooves (432), and the inner walls of the limiting clamping grooves (432) are limitedly clamped with the outer wall of the limiting roller (462); The outer wall of the protection tube (23) is fixedly connected to a connecting bearing (47), the inner sleeve of the connecting bearing (47) is fixedly connected to the outer wall of the protection tube (23), the top outer wall of the outer sleeve of the connecting bearing (47) is fixedly connected to a receiving base (48), the top outer wall of the receiving base (48) is provided with a plurality of limiting guide rails, the bottom outer wall of the anchor plate (43) is fixedly connected to a fixing block (491), the bottom outer wall of the fixing block (491) is fixedly connected to a sliding block (492), and the outer wall of the sliding block (492) is slidably connected to the inner wall of the limiting guide rail; The outer walls of both sides of the elastic folded rubber ring (422) are respectively fixedly connected to the outer wall of one side of the adjacent side anchoring plate (43); the outer walls of the anchoring plate (43) and the elastic folded rubber ring (422) are both fixedly connected to the elastic sealing rubber tube (421); the top outer walls of the anchoring plate (43) and the elastic folded rubber ring (422) are fixedly connected to the bottom outer wall of the sealing link (41) via the elastic sealing rubber tube (421).

2. A high temperature resistant retrievable downhole packer according to claim 1, characterized in that: The outer wall of the anchor plate (43) is provided with a clockwise thread groove, and multiple groups of the clockwise thread grooves on the outer wall of the anchor plate (43) are mutually connected patterns, and multiple groups of the counterclockwise thread grooves (431) on the inner wall of the anchor plate (43) are mutually connected patterns. The multiple multi-stage threaded sleeves (461) are located at different heights on the pressing plate (44) and are at the same height as the counterclockwise thread grooves (431) on the opposite side.

3. A high temperature resistant retrievable downhole packer according to claim 1, characterized in that: The oil delivery pipe (3) comprises a pipe body (31) and a fixed end head (32); a first installation channel (11) is provided on the top outer wall of the first assembly shell (1); the outer wall of the fixed end head (32) is movably connected to the inner wall of the first installation channel (11); a second installation channel (12) is provided on the bottom outer wall of the first installation channel (11); the outer wall of the pipe body (31) is movably connected to the inner wall of the second installation channel (12); a mounting inner cavity (14) is provided on the bottom outer wall of the first assembly shell (1); and the outer wall of the second assembly shell (2) is fixedly connected to the inner wall of the mounting inner cavity (14).

4. A high temperature resistant retrievable downhole packer according to claim 3, characterized in that: The outer wall of the tube body (31) is movably connected to the inner wall of the protective tube (23); a hydraulic cavity (24) is provided on the bottom outer wall of the pressure sleeve (22); a bottom plate (211) is provided on the inner wall of the hydraulic cavity (24); a sealing rubber pad (212) is fixedly connected to the top outer wall of the bottom plate (211); the outer wall of the sealing rubber pad (212) is slidably connected to the inner wall of the hydraulic cavity (24); a graphite ring plate (213) is fixedly connected to the bottom outer wall of the bottom plate (211); The bottom outer wall is movably connected to the top outer wall of the sealing link (41); the outer walls on both sides of the first assembly shell (1) are provided with connecting holes (15); the inner wall of the first assembly shell (1) is provided with a placement cavity (13); the inner wall of the connecting hole (15) is fixedly connected to a first hydraulic pipe (251); the inner wall of one end of the first hydraulic pipe (251) is connected to the inner wall of the hydraulic cavity (24) via a pressure sleeve (22); and the outer wall of the first hydraulic pipe (251) is fixedly connected to a first regulating valve (252).

5. A high temperature resistant retrievable downhole packer according to claim 4, characterized in that: The pressure sleeve (22) and the bottom plate (211) are both "C"-shaped structures, forming a through passage.

6. A high temperature resistant retrievable downhole packer according to claim 5, characterized in that: The outer wall of the first assembly housing (1) is fixedly connected to a second hydraulic pipe (16) which is in communication with the inner wall of the elastic sealing rubber cylinder (421) via a connecting hole (15) and a through-channel, and the outer wall of the second hydraulic pipe (16) is fixedly connected to a second regulating valve (17).

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