Gas injection anti-channeling interference device and method for shale gas reservoir

Abstract

The present application relates to shale oil and gas development technical field, propose a kind of shale gas reservoir gas injection anti channeling interference device and method, including wellbore annulus, main oil pipe located in wellbore annulus, and packer placed between wellbore annulus and the interlayer of main oil pipe, the packer includes: framework, it is set to the outside of main oil pipe;Rotary sleeve, set to the outside of framework and can rotate outside framework;Driving device, for driving rotary sleeve relative to framework rotation;Pneumatic assembly, can be driven under the length direction transverse motion of framework by rotary sleeve;In the present application, rotary sleeve is driven relative to framework rotation by driving device, positioning assembly is driven under the rotation of rotary sleeve and is in contact with the inner tube wall of wellbore annulus and the outer tube wall of main oil pipe, realize the positioning action of packer, relative to prior art, the packer used in the present application has good positioning effect, prevent displacement during gas injection pressurization and affect the operation of in-well gas injection pressurization.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of shale oil and gas development, in particular, to a shale gas reservoir gas injection anti-channeling interference device and method. BACKGROUND

[0002] Shale gas reservoir gas injection anti-channeling interference is a method specially designed for the problem of channeling and interwell interference in the process of shale gas exploitation. The main purpose of this technology is to reduce the pressure difference between the corresponding two wells (for example, a new fracturing well and an old production well) by injecting high-pressure gas (such as CO2) into the production well, thereby preventing interwell channeling interference. This method can significantly improve the gas production rate of shale gas wells, reduce the ineffective use of fracturing fluid in fracturing wells, and thus effectively improve the economic benefits of shale gas reservoir exploitation.

[0003] For example, the patent technology with publication number CN118088138A discloses a shale gas reservoir gas injection anti-channeling interference method, which includes the following steps: connecting a gas injection pressurization system to the target shale gas well, which is in sealed communication with the wellbore annulus; closing the oil production and gas injection channels to stop production; obtaining the gas injection amount based on the formation pressure and pore volume parameters in the well logging and logging data; injecting carbon dioxide gas into the target formation based on the gas injection pressurization system according to the obtained gas injection amount; after completing the gas injection pressurization, opening the gas production valve of the target shale gas well to implement production. This technical solution reduces the pressure difference between the corresponding two wells by injecting high-pressure gas into the production well without controlling the scale of fracturing fluid, effectively preventing interwell channeling interference.

[0004] The above-mentioned shale gas reservoir gas injection anti-channeling interference technology needs to place a packer at the starting position of the first fracturing in the target formation before using the gas injection pressurization system to pressurize the shale gas well, to prevent gas from entering the tubing through the annulus during the later gas injection pressurization process, thereby causing ineffective gas injection pressurization.

[0005] However, the existing packer is mostly of an integrated structure made of rubber, such as the patent technology with publication number CN114075940B, which discloses a packer structure, including a packer body, a setting ring and a stop ring are arranged on the packer body; a packer rubber sleeve assembly is arranged on the packer body, and the packer rubber sleeve assembly is arranged between the setting ring and the stop ring; wherein the stop ring is fixedly connected with the packer body, and the setting ring slides on the packer body under the action of the setting force and pushes the packer rubber sleeve assembly to deform, thereby completing the setting. Although this packer structure is simple in structure, low in manufacturing cost and good in sealing performance, it has poor mobility. Since the environment in the well is complex and there is a certain deformation in the tubing due to changes in gas pressure, the integrated packer is difficult to travel in the well.

[0006] In addition, the existing packer also appears an expansion structure, such as the patent technology with the announcement number CN107829705B discloses an expansion type packer assembly and a packer, the packer assembly includes an expansion pipe, the expansion pipe includes a framework, an inner layer and an outer layer, the inner layer is arranged on the inner side of the framework, the outer layer is arranged on the outer side of the framework, the framework is made of metal, the expansion pipe is further provided with a protective pipe made of rubber, which can reduce the jamming caused by the deformation and expansion of the expansion pipe during the downhole process of the packer, make the downhole process of the packer easier, and improve the reliability of the packer. Although the structure of the packer can realize expansion and facilitate the travel of the packer in the well, the sealing performance of the wellbore annulus and the double pipes of the main oil pipe cannot be guaranteed by the structure design. SUMMARY

[0007] The present application provides a shale gas reservoir gas injection anti-channeling interference device and method, which solves the problems of packer travel and sealing performance of wellbore annulus and double pipes of main oil pipe in the prior art.

[0008] The technical scheme of the present application is as follows: a shale gas reservoir gas injection anti-channeling interference device, comprising a wellbore annulus, a main oil pipe located in the wellbore annulus, and a packer placed between the wellbore annulus and the main oil pipe, the packer comprising:

[0009] a framework, sleeved on the outside of the main oil pipe;

[0010] a rotating sleeve, sleeved on the outside of the framework and capable of rotating outside the framework;

[0011] a driving device for driving the rotating sleeve to rotate relative to the framework;

[0012] a pneumatic assembly capable of moving transversely along the length direction of the framework under the driving of the rotating sleeve;

[0013] a positioning assembly abutting against the inner pipe wall of the wellbore annulus and the outer pipe wall of the main oil pipe under the synchronous driving of the rotating sleeve;

[0014] a reset spring for elastically connecting the pneumatic assembly and the framework;

[0015] a first elastic membrane inflated and in sealing contact with the inner pipe wall of the wellbore annulus under the action of the pneumatic assembly;

[0016] a second elastic membrane inflated and in sealing contact with the outer pipe wall of the main oil pipe under the action of the pneumatic assembly.

[0017] Preferably, the frame comprises an outer sleeve and an inner sleeve sleeved in the outer sleeve, one end of the outer sleeve is fixed with a first fixed disc, the other end of the outer sleeve is fixed with a second fixed disc, one end of the inner sleeve towards the first fixed disc is fixed with a cover, both ends of the first elastic film are fixed with the first fixed disc and the cover respectively, both ends of the second elastic film are fixed with the second fixed disc and the inner sleeve respectively, the top and the bottom of the outer sleeve are provided with a strip-shaped limiting slot, and the second fixed disc is provided with a plurality of arc-shaped limiting slots arranged in a ring shape.

[0018] Preferably, the first fixed disc, the cover and the first elastic film form a first cavity, and the cover is provided with a first through hole communicating with the first cavity.

[0019] Preferably, the first fixed disc, the second fixed disc, the outer sleeve and the inner sleeve form a second cavity, and the first fixed disc is provided with a second through hole communicating with the second cavity.

[0020] Preferably, both ends of the rotating sleeve are rotationally connected to the first fixed disc and the second fixed disc respectively, the outer surface of the rotating sleeve is fixed with an arc-shaped tooth segment, and the rotating sleeve is provided with two spiral limiting slots corresponding to the strip-shaped limiting slot.

[0021] Preferably, the driving device comprises a motor, the motor is fixed on the second fixed disc, and the output end of the motor is fixed with a gear engaged with the arc-shaped tooth segment.

[0022] Preferably, the pneumatic assembly comprises a slip ring, one end of the slip ring is provided with a sliding piece slidingly penetrating the first fixed disc, the outer end of the sliding piece is fixed with a first compression plug slidingly limited in the first cavity, the other end of the slip ring is fixed with a second compression plug slidingly limited in the second cavity, the top and the bottom of the slip ring are fixed with fixed rods respectively, and the two fixed rods respectively penetrate the two strip-shaped limiting slots and are limited in the two spiral limiting slots.

[0023] Preferably, one end of the reset spring abuts against the second compression plug, and the other end of the reset spring abuts against the second fixed disc.

[0024] Preferably, the positioning assembly comprises a first clamping block and a second clamping block, the first clamping block and the second clamping block are rotationally arranged on the second fixed disc through a rotating shaft, the proximal ends of the first clamping block and the second clamping block are provided with fan-shaped teeth engaged with each other, the distal ends of the first clamping block and the second clamping block are fixed with anti-skid strips, one end of the rotating sleeve close to the positioning assembly is fixed with a second hinge shaft limited in the arc-shaped limiting slot, the outer end of the second hinge shaft is hingedly connected with a connecting rod, and one end of the connecting rod away from the second hinge shaft is hingedly connected to the first clamping block through a first hinge shaft.

[0025] Based on the shale gas reservoir gas injection anti-channeling interference device, the application further provides a shale gas reservoir gas injection anti-channeling interference method.

[0026] Step one, the packer is arranged between the annulus of the wellbore and the interlayer of the main oil pipe;

[0027] Step two, the driving device is opened to drive the rotating sleeve to rotate relative to the framework;

[0028] Step three, the pneumatic assembly starts to move transversely along the length direction of the framework to overcome the elastic force of the reset spring under the driving of the rotating sleeve;

[0029] Step four, the positioning assembly is driven to abut against the inner pipe wall of the annulus of the wellbore and the outer pipe wall of the main oil pipe under the rotation of the rotating sleeve, so that the positioning action of the packer is realized;

[0030] Step five, the transverse movement of the pneumatic assembly promotes the first elastic membrane to expand and seal with the inner pipe wall of the annulus of the wellbore, and promotes the second elastic membrane to expand and seal with the outer pipe wall of the main oil pipe, so that the interlayer between the annulus of the wellbore and the main oil pipe is sealed.

[0031] The application has the following beneficial effects:

[0032] 1. In the application, the rotating sleeve is driven to rotate relative to the framework by the driving device, and the positioning assembly is driven to abut against the inner pipe wall of the annulus of the wellbore and the outer pipe wall of the main oil pipe under the rotation of the rotating sleeve, so that the positioning action of the packer is realized. Compared with the prior art, the packer adopted by the application has good positioning effect, and displacement during gas injection and pressure boosting is prevented, so that the gas injection and pressure boosting operation in the well is affected.

[0033] 2. In the application, when the rotating sleeve rotates relative to the framework, the pneumatic assembly can move transversely along the length direction of the framework to overcome the elastic force of the reset spring under the driving of the rotating sleeve, so that the first elastic membrane is expanded and sealed with the inner pipe wall of the annulus of the wellbore, and the second elastic membrane is expanded and sealed with the outer pipe wall of the main oil pipe. Compared with the prior art, the application adopts the double-sealing mode to realize the interlayer sealing between the annulus of the wellbore and the main oil pipe. BRIEF DESCRIPTION OF DRAWINGS

[0034] The application will be further described in detail below in combination with the drawings and specific embodiments.

[0035] Figure 1 The packer arrangement position schematic diagram provided by the application;

[0036] Figure 2 The packer structure schematic diagram provided by the application;

[0037] Figure 3 The packer half-section structure schematic diagram provided by the application;

[0038] Figure 4 The skeleton half-section view of the application;

[0039] Figure 5 The rotating sleeve structure view of the application;

[0040] Figure 6 The pneumatic assembly structure view of the application;

[0041] Figure 7 The positioning assembly structure view of the application;

[0042] In the figure: 1, wellbore annulus; 2, main oil pipe; 3, packer; 31, skeleton; 311, outer sleeve; 312, first fixed disc; 313, second fixed disc; 314, inner sleeve; 315, cover; 316, first cavity; 317, strip-shaped limiting groove; 318, arc-shaped limiting groove; 319, second cavity; 3110, first through hole; 3111, second through hole; 32, rotating sleeve; 321, arc-shaped tooth segment; 322, spiral limiting groove; 33, driving device; 331, motor; 332, gear; 34, pneumatic assembly; 341, slip ring; 342, slip sheet; 343, first compression plug; 344, second compression plug; 345, fixed rod; 35, positioning assembly; 351, first clamping block; 352, second clamping block; 353, rotating shaft; 354, fan-shaped tooth; 355, first hinged shaft; 356, connecting rod; 357, second hinged shaft; 358, anti-skid strip; 36, reset spring; 37, first elastic film; 38, second elastic film. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments of the application, all the other embodiments obtained by those skilled in the art without creative work, are involved in the protection scope of the application.

[0044] Please refer to Figure 1 , Figure 2 and Figure 3The application provides a technical scheme: a shale gas reservoir gas injection anti-channeling interference device, which comprises a wellbore annulus 1, a main oil pipe 2 located in the wellbore annulus 1, and a packer 3 arranged between the wellbore annulus 1 and the main oil pipe 2. The packer 3 comprises a framework 31, a rotating sleeve 32, a driving device 33, a pneumatic assembly 34, a positioning assembly 35, a reset spring 36, a first elastic film 37 and a second elastic film 38. The framework 31 is sleeved on the outside of the main oil pipe 2, the rotating sleeve 32 is sleeved on the outside of the framework 31 and can rotate outside the framework 31, the driving device 33 is used for driving the rotating sleeve 32 to rotate relative to the framework 31, the pneumatic assembly 34 can move transversely along the length direction of the framework 31 under the driving of the rotating sleeve 32, the positioning assembly 35 is in contact with the inner pipe wall of the wellbore annulus 1 and the outer pipe wall of the main oil pipe 2 under the synchronous driving of the rotating sleeve 32, the reset spring 36 is used for elastically connecting the pneumatic assembly 34 and the framework 31, the first elastic film 37 expands under the action of the pneumatic assembly 34 and is in sealing contact with the inner pipe wall of the wellbore annulus 1, and the second elastic film 38 expands under the action of the pneumatic assembly 34 and is in sealing contact with the outer pipe wall of the main oil pipe 2.

[0045] Based on the above embodiment, the application further provides a shale gas reservoir gas injection anti-channeling interference method, which comprises the following steps:

[0046] Step one, the packer 3 is arranged between the wellbore annulus 1 and the main oil pipe 2.

[0047] Step two, the driving device 33 is started to drive the rotating sleeve 32 to rotate relative to the framework 31.

[0048] Step three, the pneumatic assembly 34 starts to move transversely along the length direction of the framework 31 against the elastic force of the reset spring 36 under the driving of the rotating sleeve 32.

[0049] Step four, the positioning assembly 35 is in contact with the inner pipe wall of the wellbore annulus 1 and the outer pipe wall of the main oil pipe 2 under the driving of the rotating sleeve 32, so that the positioning action of the packer 3 is realized.

[0050] Step five, the transverse movement of the pneumatic assembly 34 causes the first elastic film 37 to expand and be in sealing contact with the inner pipe wall of the wellbore annulus 1 and causes the second elastic film 38 to expand and be in sealing contact with the outer pipe wall of the main oil pipe 2, so that the interlayer sealing of the wellbore annulus 1 and the main oil pipe 2 is realized.

[0051] Please refer to Figure 3 and Figure 4, the skeleton 31 comprises an outer sleeve 311 and an inner sleeve 314 sleeved in the outer sleeve 311, one end of the outer sleeve 311 is fixed with a first fixed disc 312, the other end of the outer sleeve 311 is fixed with a second fixed disc 313, one end of the inner sleeve 314 towards the first fixed disc 312 is fixed with a cover 315, both ends of the first elastic film 37 are fixed with the first fixed disc 312 and the cover 315 respectively, both ends of the second elastic film 38 are fixed with the second fixed disc 313 and the inner sleeve 314 respectively, the top and the bottom of the outer sleeve 311 are both provided with a strip-shaped limiting groove 317, the second fixed disc 313 is provided with a plurality of annularly distributed arc-shaped limiting grooves 318, the first fixed disc 312, the cover 315 and the first elastic film 37 form a first cavity 316, the cover 315 is provided with a first through hole 3110 communicating with the first cavity 316, the first fixed disc 312, the second fixed disc 313, the outer sleeve 311 and the inner sleeve 314 form a second cavity 319, the first fixed disc 312 is provided with a second through hole 3111 communicating with the second cavity 319.

[0052] Please refer to Figure 3 and Figure 5 , both ends of the rotating sleeve 32 are rotatably connected to the first fixed disc 312 and the second fixed disc 313 respectively, the outer surface of the rotating sleeve 32 is fixed with an arc-shaped tooth segment 321, the rotating sleeve 32 is provided with two spiral limiting grooves 322 corresponding to the strip-shaped limiting grooves 317.

[0053] Please refer to Figure 3 and Figure 4 , the driving device 33 comprises a motor 331, the motor 331 is fixed on the second fixed disc 313, the output end of the motor 331 is fixed with a gear 332 engaged with the arc-shaped tooth segment 321, the motor 331 drives the gear 332 to rotate, by the meshing action of the gear 332 and the arc-shaped tooth segment 321 on the surface of the rotating sleeve 32, as shown in the direction of Figure 2 、 Figure 3 , the rotating sleeve 32 can be driven to rotate counterclockwise relative to the skeleton 31.

[0054] Please refer to Figure 3 and Figure 6The pneumatic assembly 34 includes a slip ring 341. One end of the slip ring 341 is provided with a sliding plate 342 that slides through the first fixed plate 312. The outer end of the sliding plate 342 is fixed with a first pressure plug 343 that slides and is limited in the first chamber 316. The other end of the slip ring 341 is fixed with a second pressure plug 344 that slides and is limited in the second chamber 319. The top and bottom of the slip ring 341 are both fixed with fixing rods 345. The two fixing rods 345 pass through two strip-shaped limiting grooves 317 and are limited in two spiral limiting grooves 322. When the rotating sleeve 32 rotates counterclockwise relative to the frame 31, the fixing rods 345 of the pneumatic assembly 34 are pushed by the spiral limiting grooves 322 on the rotating sleeve 32 and the fixing rods 345 are slidably limited by the strip-shaped limiting grooves 317 on the outer sleeve 311. This allows the pneumatic assembly 34 to move laterally along the length of the frame 31, overcoming the elastic force of the return spring 36.

[0055] It should be noted that one end of the return spring 36 abuts against the second pressure plug 344, and the other end of the return spring 36 abuts against the second fixed plate 313.

[0056] Please see Figure 3 and Figure 7 The positioning component 35 includes a first locking block 351 and a second locking block 352. Both the first locking block 351 and the second locking block 352 are rotatably mounted on the second fixed disk 313 via a rotating shaft 353. The proximal ends of the first locking block 351 and the second locking block 352 are each provided with meshing sector teeth 354. The distal ends of the first locking block 351 and the second locking block 352 are each fixed with anti-slip strips 358. The end of the rotating sleeve 32 closest to the positioning component 35 is fixed with a second hinge shaft 357, which is limited by an arc-shaped limiting groove 318. The second hinge shaft 357... A connecting rod 356 is hinged to the outer end. The end of the connecting rod 356 away from the second hinge shaft 357 is hinged to the first locking block 351 through the first hinge shaft 355. When the rotating sleeve 32 rotates counterclockwise relative to the frame 31, it can drive the second hinge shaft 357 to rotate. Under the push of the connecting rod 356 on the first locking block 351, the first locking block 351 rotates counterclockwise around the rotating shaft 353. Under the mutual meshing of the sector teeth 354 of the first locking block 351 and the second locking block 352, the second locking block 352 can be driven to rotate clockwise synchronously.

[0057] The working principle and usage process of this invention are as follows: Before injecting gas to increase pressure for shale gas reservoir anti-channeling, the packer 3 is placed between the annulus 1 and the main tubing 2 in the fracturing section. The motor 331 is turned on to drive the gear 332 to rotate. Through the meshing action of the gear 332 and the arc-shaped tooth segment 321 on the surface of the rotating sleeve 32, as shown... Figure 2 , Figure 3In the indicated direction, the rotating sleeve 32 can be driven to rotate counterclockwise relative to the frame 31, thereby driving the second hinge shaft 357 to rotate. Under the push of the connecting rod 356 on the first locking block 351, the first locking block 351 rotates counterclockwise around the rotating shaft 353. Under the mutual meshing of the fan-shaped teeth 354 of the first locking block 351 and the second locking block 352, the second locking block 352 can be driven to rotate clockwise synchronously. That is, the first locking block 351 expands from the inside to the outside and abuts against the inner wall of the wellbore annulus 1, while the second locking block 352 expands from the outside to the inside and abuts against the outer wall of the main tubing 2, thereby realizing the positioning action of the packer 3 between the wellbore annulus 1 and the main tubing 2.

[0058] During the aforementioned process, as the rotating sleeve 32 rotates counterclockwise relative to the frame 31, the fixed rod 345 of the pneumatic component 34 is pushed by the spiral limiting groove 322 on the rotating sleeve 32, and the fixed rod 345 is slidably limited by the strip limiting groove 317 on the outer sleeve 311. This drives the pneumatic component 34 to move laterally along the length of the frame 31, overcoming the elastic force of the return spring 36. Then, the first pressure plug 343 moves and compresses within the first chamber 316, causing the first elastic membrane 37 to expand and seal against the inner wall of the wellbore annulus 1. The second pressure plug 344 moves and compresses within the second chamber 319, causing the second elastic membrane 38 to expand and seal against the outer wall of the main tubing 2, thus achieving a sandwich seal between the wellbore annulus 1 and the main tubing 2.

[0059] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for preventing pressure channeling interference during gas injection in a shale gas reservoir, comprising a wellbore annulus (1), a main tubing (2) located within the wellbore annulus (1), and a packer (3) placed between the wellbore annulus (1) and the main tubing (2), characterized in that, The packer (3) includes: The skeleton (31) is fitted onto the outside of the main oil pipe (2); A rotating sleeve (32) is fitted over the frame (31) and can rotate outside the frame (31); A drive device (33) is used to drive the rotating sleeve (32) to rotate relative to the frame (31); The pneumatic assembly (34) is capable of moving laterally along the length of the frame (31) under the drive of the rotating sleeve (32); The positioning component (35) abuts against the inner wall of the wellbore annulus (1) and the outer wall of the main tubing (2) under the synchronous drive of the rotating sleeve (32); A return spring (36) is used to elastically connect the pneumatic assembly (34) to the frame (31); The first elastic membrane (37) expands under the action of the pneumatic component (34) and seals in contact with the inner wall of the wellbore annulus (1); The second elastic membrane (38) expands under the action of the pneumatic component (34) and seals against the outer wall of the main oil pipe (2); The frame (31) includes an outer tube (311) and an inner tube (314) fitted inside the outer tube (311). One end of the outer tube (311) is fixed with a first fixing plate (312), and the other end of the outer tube (311) is fixed with a second fixing plate (313). One end of the inner tube (314) facing the first fixing plate (312) is fixed with a cap (315). The two ends of the first elastic membrane (37) are fixed to the first fixing plate (312) and the cap (315) respectively. The two ends of the second elastic membrane (38) are fixed to the second fixing plate (313) and the inner tube (314) respectively. The top and bottom of the outer tube (311) are provided with strip-shaped limiting grooves (317). The second fixing plate (313) is provided with a plurality of annularly distributed arc-shaped limiting grooves (318). The first fixed plate (312), the cover (315) and the first elastic membrane (37) surround to form a first chamber (316), and the cover (315) is provided with a first through hole (3110) communicating with the first chamber (316); The first fixing plate (312), the second fixing plate (313), the outer sleeve (311) and the inner sleeve (314) enclose to form a second chamber (319), and the first fixing plate (312) is provided with a second through hole (3111) communicating with the second chamber (319); The two ends of the rotating sleeve (32) are rotatably connected to the first fixed plate (312) and the second fixed plate (313) respectively. The outer surface of the rotating sleeve (32) is fixed with an arc-shaped tooth segment (321). The rotating sleeve (32) has two spiral limiting grooves (322) that correspond to the strip-shaped limiting groove (317). The pneumatic assembly (34) includes a slip ring (341). One end of the slip ring (341) is provided with a sliding plate (342) that slides through the first fixed plate (312). The outer end of the sliding plate (342) is fixed with a first pressure plug (343) that slides within the first chamber (316). The other end of the slip ring (341) is fixed with a second pressure plug (344) that slides within the second chamber (319). The top and bottom of the slip ring (341) are both fixed with fixing rods (345), and the two fixing rods (345) respectively pass through two strip-shaped limiting grooves (317) and are limited within two spiral limiting grooves (322).

2. The shale gas reservoir gas injection anti-pressure channeling interference device according to claim 1, characterized in that, The drive device (33) includes a motor (331), which is fixed on a second fixed plate (313). The output end of the motor (331) is fixed with a gear (332) that meshes with the arc-shaped tooth segment (321).

3. The shale gas reservoir gas injection anti-pressure channeling interference device according to claim 1, characterized in that, One end of the return spring (36) abuts against the second pressure plug (344), and the other end of the return spring (36) abuts against the second fixed plate (313).

4. The shale gas reservoir gas injection anti-pressure channeling interference device according to claim 1, characterized in that, The positioning component (35) includes a first locking block (351) and a second locking block (352). Both the first locking block (351) and the second locking block (352) are rotatably mounted on the second fixed disk (313) via a rotating shaft (353). The first locking block (351) and the second locking block (352) are provided with mutually meshing sector teeth (354) at their proximal ends. The first locking block (351) and the second locking block (352) are fixed with anti-slip strips (358) at their distal ends. The rotating sleeve (32) is fixed with a second hinge shaft (357) that is limited to an arc-shaped limiting groove (318) at its proximal end. A connecting rod (356) is hinged to the outer end of the second hinge shaft (357). The connecting rod (356) is hinged to the first locking block (351) via a first hinge shaft (355) at its distal end.

5. A method for preventing pressure channeling interference during gas injection in a shale gas reservoir, comprising a device for preventing pressure channeling interference during gas injection in a shale gas reservoir according to claim 1, characterized in that, Includes the following steps: Step 1: Place the packer (3) between the annulus (1) and the main tubing (2) in the wellbore; Step 2: Activate the drive device (33) to drive the rotating sleeve (32) to rotate relative to the frame (31); Step 3: The pneumatic assembly (34) begins to move laterally along the length of the frame (31) under the drive of the rotating sleeve (32), overcoming the elastic force of the return spring (36); Step 4: The positioning component (35) is driven by the rotation of the rotating sleeve (32) to abut against the inner wall of the wellbore annulus (1) and the outer wall of the main tubing (2), thereby realizing the positioning action of the packer (3). Step 5: The lateral movement of the pneumatic component (34) causes the first elastic membrane (37) to expand and seal against the inner wall of the wellbore annulus (1), while simultaneously causing the second elastic membrane (38) to expand and seal against the outer wall of the main tubing (2), thereby achieving a sandwich seal between the wellbore annulus (1) and the main tubing (2).

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