Anchoring device

Abstract

The invention belongs to the technical field of petroleum drilling development, and discloses an anchoring device which comprises an anchoring assembly, a driving assembly and a resetting assembly. The anchoring assembly comprises a central pipe and a plurality of anchor flukes; the driving assembly comprises a middle sleeve and a plurality of driving parts, the driving parts are sequentially, coaxially and slidably arranged on the central pipe in a sleeving mode, guide rails are arranged on the driving parts, the outer surfaces of the guide rails are gradually close to the central axes of the driving parts in the first direction and towards the direction close to the first ends of the driving parts, and the anchor flukes are slidably connected to the guide rails; the driving piece can slide in the first direction relative to the middle sleeve to drive the anchor flukes to slide along the guide rails, so that the anchor flukes stretch out of the avoiding holes and are anchored to the inner wall of the expansion sleeve. According to the anchoring device, the number of the anchor flukes can be adjusted according to needs, concentrated stress of a single anchor fluke is reduced, and therefore damage of the concentrated stress to the expansion sleeve is avoided. The reset assembly can reset the driving piece, and the risk that the anchor fluke cannot retreat is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil drilling development, and in particular to an anchoring device. BACKGROUND

[0002] The expandable pipe technology refers to a technology of expanding an expandable pipe and tightly adhering the expandable pipe to a casing or a borehole wall to achieve the purposes of repairing a damaged casing or isolating a complex formation. The anchoring tool is a downhole operation tool for expanding the expandable pipe and adhering the expandable pipe to the casing or the borehole wall, and is commonly used in sand fracturing, gas testing and other working conditions. The working principle of the anchoring tool is that when pressure is applied from the tubing, the pressure pushes the slips to expand radially, and the slips are clamped to the inner wall of the casing to prevent the displacement of the pipe string and achieve the anchoring effect. After the pressure is released, the slips are retracted under the elastic force of the radial spring to release the anchoring.

[0003] In the expandable pipe construction process, if a mechanical expansion system is used, the pump needs to be started on the ground to provide pressure, and under the action of the hydraulic pressure, the anchoring tool provides anchoring force to anchor the central pipe and the expandable pipe, and the two are kept relatively fixed. Then, the multi-stage hydraulic cylinder pushes the expansion cone to walk in the expandable pipe, so that the expandable pipe is expanded. The anchoring of the central pipe and the expandable pipe needs to be firm, but the anchor claw cannot damage the inner wall of the expandable pipe, because the material of the expandable pipe is relatively soft compared with the anchor claw, and is prone to deformation and damage. At the same time, when unlocking, the anchor claw should be able to be released in time. In addition, in a small size expandable pipe system, due to the size limitation, the anchoring tool needs to be opened to a larger outer diameter in a smaller space.

[0004] The conventional anchoring tool has a small anchoring area, which is easy to cause concentrated stress, resulting in damage of the anchor claw to the expandable pipe, reduction of the strength of the expandable pipe, and influence on the subsequent expandable pipe construction. At the same time, once the slip is stuck with the body, the limited elastic force provided by the radial spring is not enough to release the slip, and a pipe sticking accident will also occur. SUMMARY

[0005] The purpose of the present application is to provide an anchoring device which can adjust the number of anchor claws as needed, reduce the concentrated stress of the single anchor claw, thereby avoiding the damage of the concentrated stress to the expandable casing, and also reducing the risk that the anchor claw cannot be retracted.

[0006] To achieve this purpose, the present application adopts the following technical solutions:

[0007] The anchoring device comprises:

[0008] The anchoring assembly comprises a central pipe and a plurality of anchor claws.

[0009] The driving assembly comprises a middle sleeve and a plurality of driving members, the plurality of driving members are coaxially and slidably sleeved on the central pipe in sequence, a guide rail is arranged on the first end of the driving member in the first direction, the first direction is parallel to the axis direction of the central pipe, the outer surface of the guide rail gradually approaches the central axis of the driving member in the first direction and towards the direction close to the first end of the driving member, the anchor claw is slidably connected on the guide rail, the middle sleeve is coaxially sleeved on the driving member, the middle sleeve is provided with a relief hole corresponding to the anchor claw, the two ends of the anchor claw in the first direction are respectively abutted on the middle sleeve, the driving member can slide in the first direction relative to the middle sleeve, driving the anchor claw to slide along the guide rail in the direction away from the first end of the driving member, so that the anchor claw extends out of the relief hole and is anchored on the inner wall of the expansion sleeve.

[0010] The reset assembly comprises a reset elastic member, the reset elastic member is coaxially sleeved on the central pipe, one end of the reset elastic member is abutted with the driving member at the downstream end portion in the first direction, and the other end of the reset elastic member is fixedly connected with the central pipe.

[0011] Optionally, a guide structure is arranged between the guide rail and the anchor claw, the guide structure is used for guiding the sliding of the anchor claw, the guide structure comprises a first guide structure and a second guide structure matched with each other, the first guide structure is arranged on the guide rail in the first direction, and the second guide structure is arranged on the anchor claw.

[0012] Optionally, one of the first guide structure and the second guide structure comprises a sliding block, and the other comprises a sliding groove matched with the sliding block in sliding.

[0013] Optionally, the sliding block comprises a fixedly connected connecting portion and a limiting portion, the width of the limiting portion is greater than the width of the connecting portion, and the side, away from the limiting portion, of the connecting portion is connected to the guide rail or the anchor claw.

[0014] Optionally, a plurality of first guide structures are arranged, the plurality of first guide structures are arranged in the circumferential direction of the driving member and uniformly spaced, and each first guide structure is correspondingly connected with one anchor claw.

[0015] Optionally, among the plurality of driving members, the driving member at the upstream end portion in the first direction is a driving driving member, and the rest are auxiliary driving members, the driving driving member and the plurality of auxiliary driving members are coaxially and slidably sleeved on the central pipe in sequence in the first direction.

[0016] The anchoring device further comprises a first end connecting sleeve coaxially sleeved on the driving member and in sliding seal with the driving member, the first end connecting sleeve is provided with the avoiding hole corresponding to the anchor claw on the first end of the driving member, and an oil storage cavity is formed between the second end of the driving member, the inner wall of the first end connecting sleeve and the central pipe, and the central pipe is provided with an oil passing hole in communication with the oil storage cavity.

[0017] Optionally, the anchoring device further comprises a sealing member, an outer wall of the second end of the driving member is provided with a sealing groove, and the sealing member is clamped between the groove wall of the sealing groove and the inner wall of the first end connecting sleeve.

[0018] Optionally, the anchoring device further comprises a second end connecting sleeve, the second end connecting sleeve is fixedly connected to the end of the central pipe close to the reset assembly and coaxially sleeved outside the reset elastic member, and the end of the reset elastic member abuts against the inner wall of the second end connecting sleeve.

[0019] Optionally, the reset assembly further comprises a limiting sleeve, the limiting sleeve is coaxially sleeved on the central pipe and clamped between the central pipe and the reset elastic member, and the length of the limiting sleeve is less than the length of the reset elastic member.

[0020] Optionally, the reset assembly further comprises a stop ring, the stop ring is coaxially and slidably sleeved on the central pipe and clamped between the end of the reset elastic member and the driving member, and the inner diameter of the stop ring is less than the outer diameter of the limiting sleeve.

[0021] The beneficial effects of the present application are as follows:

[0022] The anchor device provided by the application comprises an anchor assembly, a driving assembly and a reset assembly. The anchor assembly comprises a central pipe and a plurality of anchor claws, and the driving assembly comprises an intermediate sleeve and a plurality of driving members. Specifically, the plurality of driving members are coaxially and slidably sleeved on the central pipe, the first end of the driving member is provided with a guide rail in the first direction, the first direction is parallel to the axis direction of the central pipe, the outer surface of the guide rail gradually approaches the central axis of the driving member in the first direction and towards the direction close to the first end of the driving member, and the anchor claw is slidably connected to the guide rail. That is, by adjusting the number of driving members, the number of anchor claws can be changed to meet the anchoring requirements of the expansion sleeve of different lengths. The intermediate sleeve is coaxially sleeved on the driving member, the intermediate sleeve is provided with a plurality of avoiding holes corresponding to the anchor claws, the two ends of the anchor claw in the first direction are respectively abutted on the intermediate sleeve, the driving member can slide relative to the intermediate sleeve in the first direction, and the anchor claw slides along the guide rail in the direction away from the first end of the driving member, so that the anchor claw extends out of the avoiding hole and is anchored on the inner wall of the expansion sleeve. When the anchor claw slides, the radial direction of the anchor claw gradually deviates from the central axis of the central pipe, and then the anchor claw extends out of the avoiding hole to realize anchoring. The plurality of anchor claws jointly act to make the anchoring force more dispersed, reduce the anchoring concentration of a single anchor claw, and thus reduce the damage to the inner wall of the expansion sleeve when the anchor claw anchors. The reset assembly comprises a reset elastic member, the reset elastic member is coaxially sleeved on the central pipe, one end of the reset elastic member is abutted against the driving member at the downstream end in the first direction, and the other end of the reset elastic member is fixedly connected with the central pipe. The reset assembly can reset the driving member and reduce the risk that the anchor claw cannot be retracted. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the description of the embodiments of the present application will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art according to the contents of the embodiments of the present application and the drawings without creative labor.

[0024] Figure 1 is a structural schematic view of the anchor device provided by the embodiments of the present application;

[0025] Figure 2 is a structural schematic view of the anchor device provided by the embodiments of the present application when in use;

[0026] Figure 3 is a structural schematic view of the anchor claw provided by the embodiments of the present application;

[0027] Figure 4 is a structural schematic view of the auxiliary driving member provided by the embodiments of the present application.

[0028] In the drawings:

[0029] 1, anchor assembly; 11, center tube; 111, oil passage; 12, anchor jaw; 121, sliding groove;

[0030] 2, drive assembly; 21, main driving part; 22, auxiliary driving part; 23, intermediate sleeve; 24, guide rail; 241, sliding block; 2411, connecting part; 2412, limiting part;

[0031] 3, reset assembly; 31, reset elastic part; 32, limiting sleeve; 33, stop ring;

[0032] 4, first end connecting sleeve; 41, oil storage cavity;

[0033] 5, second end connecting sleeve;

[0034] 6, sealing part. DETAILED DESCRIPTION

[0035] The technical solutions of the present application will be further described below in combination with the accompanying drawings and through specific embodiments.

[0036] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be described clearly and completely below in combination with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. The components of the embodiments of the present application described and shown in the accompanying drawings can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative labor are within the scope of protection of the present application.

[0038] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0039] In the description of the present application, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings or the orientation or positional relationship in which the product of the present application is usually placed, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only used for differentiation and cannot be understood as indicating or implying relative importance. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0040] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "provided", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0041] In the present application, unless otherwise specified and limited, "on" or "under" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, "on", "above" and "above" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. "Below", "below" and "below" of the first feature to the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0042] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation on the present application.

[0043] Figure 1 A structural schematic diagram of an anchoring device provided by an embodiment of the present application is shown; Figure 2 A structural schematic diagram of the anchoring device provided by an embodiment of the present application when in use is shown, referring to Figure 1 and Figure 2 The present embodiment provides an anchoring device for anchoring the inner wall of an inflatable sleeve. The anchoring device comprises an anchoring assembly 1, a driving assembly 2 and a resetting assembly 3.

[0044] The anchor assembly 1 comprises a central pipe 11 and a plurality of anchor claws 12, and the driving assembly 2 comprises an intermediate sleeve 23 and a plurality of driving members. Specifically, the plurality of driving members are coaxially and slidably sleeved on the central pipe 11 in sequence, the first end of the driving member is provided with a guide rail 24 in the first direction, the first direction is parallel to the axis direction of the central pipe 11, and the outer surface of the guide rail 24 gradually approaches the central axis of the driving member in the first direction and towards the direction close to the first end of the driving member, and the anchor claw 12 is slidably connected to the guide rail 24. That is, by adjusting the number of driving members, the number of anchor claws 12 can be changed to adapt to the anchoring needs of the expansion sleeve of different lengths.

[0045] The intermediate sleeve 23 is coaxially sleeved on the driving member, the intermediate sleeve 23 is provided with a relief hole corresponding to the anchor claw 12, and the two ends of the anchor claw 12 in the first direction abut on the intermediate sleeve 23, respectively. The driving member can slide relative to the intermediate sleeve 23 in the first direction, driving the anchor claw 12 to slide along the guide rail 24 away from the first end of the driving member, so that the anchor claw 12 extends out of the relief hole and is anchored on the inner wall of the expansion sleeve. When the anchor claw 12 slides, it gradually moves away from the central axis of the central pipe 11 in the radial direction of the central pipe 11, and then extends out of the relief hole to achieve anchoring on the inner wall of the expansion sleeve. The plurality of anchor claws 12 act together to make the anchor force more dispersed, reducing the concentrated anchor force of a single anchor claw 12, thereby reducing the damage to the inner wall of the expansion sleeve when the anchor claw 12 is anchored.

[0046] Continuing to refer to Figure 1 and Figure 2 In the plurality of driving members of the embodiment, the driving member located at the upstream end in the first direction is the main driving member 21, and the rest are auxiliary driving members 22. The main driving member 21 and the plurality of auxiliary driving members 22 are coaxially and slidably sleeved on the central pipe 11 in sequence in the first direction, and the main driving member 21 can push the plurality of auxiliary driving members 22 to slide in the first direction. By adjusting the number of auxiliary driving members 22, the anchoring device can be adapted to the anchoring operation of expansion sleeves of various lengths.

[0047] Specifically, the anchoring device further comprises a first end connecting sleeve 4. The first end connecting sleeve 4 is coaxially sleeved on the main driving member 21 and is in sliding sealing with the main driving member 21. The first end connecting sleeve 4 is provided with the above-mentioned relief hole at the position corresponding to the anchor claw 12 on the first end of the main driving member 21, so that the anchor claw 12 can extend out. The second end of the main driving member 21, the inner wall of the first end connecting sleeve 4 and the central pipe 11 have an oil storage cavity 41, and the central pipe 11 has an oil passage 111 communicating with the oil storage cavity 41. Oil can be injected into the oil storage cavity 41 from the oil passage 111 on the central pipe 11, and the oil will drive the second end of the main driving member 21 to move, thereby realizing the sliding of the main driving member 21 and the plurality of auxiliary driving members 22 in the first direction.

[0048] Further, the anchoring device further comprises a sealing member 6. The outer wall of the second end of the driving member 21 is provided with a sealing groove, and the sealing member 6 is clamped between the groove wall of the sealing groove and the inner wall of the first end connecting sleeve 4. The sealing member 6 can be, but is not limited to, a rubber sealing ring commonly used in the prior art.

[0049] Optionally, as shown in the figure, a guide structure is arranged between the guide rail 24 and the anchor claw 12, and the guide structure is used for guiding the sliding of the anchor claw 12. The guide structure comprises a first guide structure and a second guide structure which are matched with each other. The first guide structure is arranged on the guide rail 24 along a first direction, and the second guide structure is arranged on the anchor claw 12. The guide structure can improve the stability of the anchor claw 12 when sliding. Figures 1-4

[0050] Exemplarily, one of the first guide structure and the second guide structure comprises a sliding block 241, and the other comprises a sliding groove 121 which is in sliding cooperation with the sliding block 241. In this embodiment, the sliding block 241 is arranged on the guide rail 24, and the sliding groove 121 is arranged at the bottom of the anchor claw 12. The sliding groove 121 cooperates with the sliding block 241, so that the anchor claw 12 can slide along the sliding block 241, and the smoothness during sliding is ensured. Of course, the positions of the sliding groove 121 and the sliding block 241 can be interchanged, and the guiding effect will not be affected.

[0051] Specifically, the sliding block 241 comprises a connecting portion 2411 and a limiting portion 2412 which are fixedly connected. The width of the limiting portion 2412 is greater than the width of the connecting portion 2411, and the side of the connecting portion 2411 away from the limiting portion 2412 is connected to the guide rail 24 or the anchor claw 12. That is, when the sliding block 241 is in sliding cooperation with the sliding groove 121, because the size of the limiting portion 2412 is larger, the limiting portion 2412 is always located in the sliding groove 121 and will not come out of the sliding groove 121 during sliding, thereby ensuring the stability and safety of the anchor claw 12 during sliding. For reference Figure 3 and Figure 4 In this embodiment, the sliding block 241 is a T-shaped block, and the sliding groove 121 is a T-shaped groove, so as to realize the limiting function on the premise of ensuring the smoothness of sliding.

[0052] Optionally, in other embodiments, the guide structure can also be a sliding rail and a pulley which are in rolling cooperation. One of the sliding rail and the pulley is arranged on the guide rail 24, and the other is arranged on the anchor claw 12, which can also guide the sliding of the anchor claw 12, and the rolling movement is more smooth than the sliding movement.

[0053] As preferred, a plurality of first guide structures are arranged, and the plurality of first guide structures are arranged along the circumference of the driving member and are uniformly arranged at intervals. Each first guide structure is correspondingly connected with one anchor claw 12. Arranging a plurality of anchor claws 12 along the circumference of the driving member can ensure the stability and uniformity of the force applied by the anchoring device to the inner wall of the expansion sleeve during anchoring.​

[0054] With reference to the above description Figure 1 and Figure 2 The reset assembly 3 comprises a reset elastic member 31 coaxially sleeved on the central pipe 11, one end of the reset elastic member 31 abuts against the driving member at the downstream end portion in the first direction, and the other end of the reset elastic member 31 is fixedly connected with the central pipe 11. The reset elastic member 31 can reset the driving member and reduce the risk that the anchor claw 12 cannot be retracted. In the embodiment, the reset elastic member 31 can be a reset spring.

[0055] Specifically, the reset assembly 3 further comprises a limiting sleeve 32. The limiting sleeve 32 is coaxially sleeved on the central pipe 11, and is clamped between the central pipe 11 and the reset elastic member 31. The length of the limiting sleeve 32 is less than the length of the reset elastic member 31. When the auxiliary driving member 22 slides in the first direction and compresses the reset elastic member 31, the limiting sleeve 32 is used to limit the travel distance of the auxiliary driving member 22. When the auxiliary driving member 22 abuts against the limiting sleeve 32, it is the farthest moving distance of the auxiliary driving member 22.

[0056] Further specifically, the reset assembly 3 further comprises a stop ring 33. The stop ring 33 is coaxially and slidably sleeved on the central pipe 11, and is clamped between the end portion of the reset elastic member 31 and the driving member. The inner diameter of the stop ring 33 is less than the outer diameter of the limiting sleeve 32. The stop ring 33 can push the reset elastic member 31 and stop on the end face of the limiting sleeve 32.

[0057] Optionally, the anchoring device further comprises a second end connecting sleeve 5. The second end connecting sleeve 5 is fixedly connected to the end portion of the central pipe 11 close to the reset assembly 3, and is coaxially sleeved outside the reset elastic member 31. The end portion of the reset elastic member 31 abuts against the inner wall of the second end connecting sleeve 5. The second end connecting sleeve 5 can also be connected with an external pipeline.

[0058] The use process of the anchoring device provided in the embodiment is as follows:

[0059] The anchoring device is lowered into the well along with the expansion casing system, and the ground pump is started. In this embodiment, the anchoring device is used vertically, the first direction is parallel to the vertical direction, and the vertical direction is upward. The driving member 21 is provided with a sealing member 6, and a piston structure is formed between the driving member 21 and the first end connecting sleeve 4. Under the action of the pump pressure, the driving member 21 moves upward, and the upper auxiliary driving member 22 is pushed to move upward. The auxiliary driving member 22 is a multi-stage structure, and a plurality of auxiliary driving members 22 are arranged in sequence. Each auxiliary driving member 22 is designed with a plurality of sliding blocks 241 uniformly distributed thereon, and the anchor claw 12 is designed with a sliding groove 121, and the anchor claw 12 and the auxiliary driving member 22 are in sliding fit. When the auxiliary driving member 22 moves upward, the anchor claw 12 is pushed to open radially by the sliding block 241. The first end connecting sleeve 4 and the intermediate sleeve 23 are both provided with a relief hole, which is matched with the shape of the anchor claw 12, so as to serve as a space for installing the anchor claw 12, and also serves to fix the anchor claw 12.

[0060] In the process of upward movement of the driving member 21 and the multi-stage auxiliary driving member 22, the auxiliary driving member 22 also pushes the stop ring 33 upward, and compresses the reset elastic member 31. When the stop ring 33 moves to the limiting sleeve 32, it is blocked and no longer moves upward. This position is the limit of the piston structure movement of the driving member 21, and is also the limit of the opening of the anchor claw 12. By optimizing the travel of the stop ring 33, the opening diameter of the anchor claw 12 can be changed. After the anchor claw 12 is opened, the anchor claw 12 is anchored in the inner wall of the outer expansion casing through the uniformly distributed tooth structure on the anchor claw 12, so as to realize the anchoring of the central pipe 11 and the expansion casing. Since the multi-stage auxiliary driving member 22 structure is adopted, and a plurality of anchor claws 12 are distributed circumferentially on each auxiliary driving member 22, the number of auxiliary driving members 22 can be increased according to the well conditions, and the number of anchor claws 12 is increased, thereby reducing the anchoring concentrated force of a single anchor claw 12, and reducing the damage to the inner wall of the expansion casing during anchoring.

[0061] When an expansion stroke is completed and the anchoring device needs to be unlocked, the ground pump is stopped and the pressure is released. The upper reset elastic member 31 pushes the stop ring 33 to move downward, and promotes the downward movement of the multi-stage auxiliary driving member 22 and the driving member 21. The multi-stage auxiliary driving member 22 and the driving member 21 make the anchor claw 12 radially contract through the guide rail 24 structure, so that the split anchor claw 12 returns to the initial state smoothly, and the unlocking is realized.

[0062] Obviously, the above embodiments of the present application are merely example for clearly explaining the present application, and are not intended to limit the embodiments of the present application. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, it is not necessary and also impossible to enumerate all the embodiments. Any modification, equivalent replacement and improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. An anchoring device, characterized in that, The utility model relates to an anchor assembly (1) comprising a central tube (11) and a plurality of anchor claws (12), a driving assembly (2) comprising an intermediate sleeve (23) and a plurality of driving members, the plurality of driving members being coaxially and slidably sleeved on the central tube (11) in sequence, the first end of the driving member being provided with a guide rail (24) in a first direction, the first direction being parallel to the axial direction of the central tube (11), the outer surface of the guide rail (24) gradually approaching the central axis of the driving member in the first direction and towards the direction close to the first end of the driving member, the anchor claw (12) being slidably connected on the guide rail (24), the intermediate sleeve (23) being coaxially sleeved on the driving member, the intermediate sleeve (23) being provided with a relief hole corresponding to the anchor claw (12), the two ends of the anchor claw (12) in the first direction abutting on the intermediate sleeve (23) respectively, the driving member being capable of sliding in the first direction relative to the intermediate sleeve (23) to drive the anchor claw (12) to slide along the guide rail (24) in the direction away from the first end of the driving member so that the anchor claw (12) extends out of the relief hole and is anchored on the inner wall of the expansion sleeve. The utility model relates to a reset assembly (3) comprising a reset elastic member (31), the reset elastic member (31) being coaxially sleeved on the central tube (11), one end of the reset elastic member (31) abutting on the driving member at the downstream end in the first direction, the other end of the reset elastic member (31) being fixedly connected with the central tube (11). A guide structure is arranged between the guide rail (24) and the anchor claw (12), the guide structure being used for guiding the sliding of the anchor claw (12), the guide structure comprising a first guide structure and a second guide structure matched with each other, the first guide structure being arranged on the guide rail (24) in the first direction, the second guide structure being arranged on the anchor claw (12). One of the first guide structure and the second guide structure comprises a sliding block (241), and the other comprises a sliding groove (121) slidably matched with the sliding block (241).

2. The anchoring device of claim 1, wherein, The sliding block (241) comprises a fixedly connected connecting portion (2411) and a limiting portion (2412), the width of the limiting portion (2412) being greater than the width of the connecting portion (2411), the side, away from the limiting portion (2412), of the connecting portion (2411) being connected to the guide rail (24) or the anchor claw (12).

3. An anchoring device according to claim 2, characterized in that A plurality of first guide structures are arranged, the plurality of first guide structures being arranged in a circumferential direction of the driving member and uniformly spaced, each of the first guide structures being correspondingly connected with one of the anchor claws (12).

4. An anchoring device according to claim 3, characterized in that Among the plurality of driving members, the driving member at the upstream end in the first direction is a driving driving member (21), and the rest are auxiliary driving members (22), the driving driving member (21) and the plurality of auxiliary driving members (22) being coaxially and slidably sleeved on the central tube (11) in sequence in the first direction.

5. The anchoring device of claim 2, wherein, ​ 6. The anchoring device of claim 1, wherein, ​ The anchor device further comprises a first end connecting sleeve (4) coaxially sleeved on the driving member (21) and in sliding seal with the driving member (21), the first end connecting sleeve (4) is provided with the avoiding hole corresponding to the anchor claw (12) on the first end of the driving member (21), and an oil storage cavity (41) is formed between the second end of the driving member (21), the inner wall of the first end connecting sleeve (4) and the center pipe (11), and the center pipe (11) is provided with an oil passing hole (111) in communication with the oil storage cavity (41).

7. An anchoring device according to claim 6, characterized in that Further comprising a sealing member (6), the outer wall of the second end of the driving member (21) is provided with a sealing groove, and the sealing member (6) is clamped between the groove wall of the sealing groove and the inner wall of the first end connecting sleeve (4).

8. An anchoring device according to any one of claims 1-7, characterised in that Further comprising a second end connecting sleeve (5) fixedly connected to the end of the center pipe (11) close to the reset assembly (3) and coaxially sleeved outside the reset elastic member (31), and the end of the reset elastic member (31) abuts against the inner wall of the second end connecting sleeve (5).

9. An anchoring device according to any one of claims 1-7, characterised in that The reset assembly (3) further comprises a limiting sleeve (32) coaxially sleeved on the center pipe (11) and clamped between the center pipe (11) and the reset elastic member (31), and the length of the limiting sleeve (32) is less than the length of the reset elastic member (31).

10. The anchoring device of claim 9, wherein, The reset assembly (3) further comprises a stop ring (33) coaxially and slidably sleeved on the center pipe (11) and clamped between the end of the reset elastic member (31) and the driving member, and the inner diameter of the stop ring (33) is less than the outer diameter of the limiting sleeve (32).

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