Anchoring and supporting device for well drilling

Abstract

The invention provides an anchoring and supporting device for well drilling, and relates to the technical field of lateral drilling of branch wells in oil and gas fields, the anchoring and supporting device comprises a first anchoring mechanism, a second anchoring mechanism, a third anchoring mechanism and a fourth anchoring mechanism, a first connecting structure connected with an upper drilling tool is arranged on the first side of the first main body; the second anchoring mechanism comprises a second main body and a second slip arranged on the second main body, the upper end face of the second main body is arranged to be a second wedge-shaped inclined face capable of being matched with the first wedge-shaped inclined face, and the first side of the second main body is provided with a second connecting structure used for being connected with a lower drilling tool; the piston motion mechanism is arranged between the first anchoring mechanism and the second anchoring mechanism and used for enabling the first anchoring mechanism and the second anchoring mechanism to be staggered in the radial direction. In the tripping-in process, a gap between the piston motion mechanism and a casing pipe is large, the drilling tool can be effectively prevented from being blocked, the piston motion mechanism has the recycling function, and the requirement that other tools are re-entered into a main well hole can be met.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas field side-drilling branch wells, in particular to an anchoring support device for drilling. Background Art

[0002] In order to solve the problems of increasing difficulty in tapping potential, high oil production costs, low single well production, and prominent conflicts in sea use in the process of stabilizing production in old oil fields, side drilling branch well technology is being widely used.

[0003] Through the side-drilling branch well technology, new wells can be added on the basis of old wells, and isolated and scattered small fault blocks and small oil layers around the old wells can be exploited to increase the production capacity of the old wells; ultra-deep wells can also be designed as multi-branch wells to reduce operating costs and increase the production capacity of single wells.

[0004] During the sidetracking of branch wells, the whipstock needs to be fixed into the main wellbore to provide lateral force for the sidetracking drill bit. Therefore, an anchoring support tool needs to be set below the whipstock. The anchoring support tool is anchored to the casing to ensure that the whipstock does not move axially or rotate circumferentially in the well, thereby ensuring that the sidetracking direction meets the drilling requirements.

[0005] The applicant has found that the existing anchoring support tools have at least the following technical problems:

[0006] The outer diameter of the tool is too large, and the gap with the casing is small, so there is a risk of the drill bit getting stuck during the lowering process; and the tools are mainly non-recoverable and cannot meet the needs of other tools for re-entry into the main wellbore.

[0007] Therefore, there is an urgent need for an anchor support device for drilling to solve the above technical problems. Summary of the invention

[0008] The purpose of the present invention is to provide an anchor support device for drilling, which has a small outer diameter, a simple structure, a recyclable function, and can be self-locked after being recycled. The preferred technical solutions among the many technical solutions provided by the present invention can produce many technical effects as described below.

[0009] To achieve the above object, the present invention provides the following technical solutions:

[0010] The present invention provides an anchor support device for drilling, comprising:

[0011] A first anchoring mechanism comprises a first body and a first slip arranged on the first body, wherein the lower end surface of the first body is arranged as a first wedge-shaped inclined surface, and a first side of the first body is arranged as a first connecting structure for connecting with an upper drilling tool;

[0012] A second anchoring mechanism comprises a second body and a second slip disposed on the second body, wherein the upper end surface of the second body is disposed as a second wedge-shaped inclined surface capable of cooperating with the first wedge-shaped inclined surface, and a first side of the second body is disposed with a second connecting structure for connecting with a lower drilling tool;

[0013] The piston movement mechanism is arranged between the first anchoring mechanism and the second anchoring mechanism, and is used to make the first anchoring mechanism and the second anchoring mechanism radially misaligned.

[0014] Preferably, a first semicircular groove is arranged in the middle of the first wedge-shaped inclined surface, and a second semicircular groove is arranged in the middle of the second wedge-shaped inclined surface, and a piston movement mechanism accommodating groove is formed between the first semicircular groove and the second semicircular groove for accommodating the piston movement mechanism.

[0015] Preferably, the piston movement mechanism comprises:

[0016] a base, connected to the second anchoring mechanism;

[0017] A piston assembly capable of driving the first anchoring mechanism to move along the second wedge-shaped inclined surface so that the first anchoring mechanism and the second anchoring mechanism are radially misaligned;

[0018] The pressure transmission component can pass through the base to act on the piston component.

[0019] Preferably, the base includes an integrally formed first body, a second body and a first boss, the first boss is arranged between the first body and the second body, and the cross-sectional diameters of the first boss, the first body and the second body decrease in sequence, wherein:

[0020] A pressure transmission channel is arranged in the base;

[0021] The outer surface of the first body is provided with a groove for connecting with the second anchoring mechanism;

[0022] The outer surface of the second body defines a first sealing groove for accommodating a sealing structure.

[0023] Preferably, the piston assembly includes a piston rod and a limiting rod, a limiting ring capable of extending into the second semicircular groove is provided on the second side of the first body, the limiting rod can extend from the limiting ring, and the piston rod is provided between the base and the limiting rod.

[0024] Preferably, the piston movement mechanism further comprises:

[0025] The elastic limiting body comprises a hollow structure, one end of which is provided with a second boss connected to the base, and the other end of which is provided with an elastic limiting claw; the piston assembly is arranged in the hollow structure;

[0026] A limiting sleeve, one end of which is sleeved on the outside of the elastic limiting body and abuts against the second boss, and the other end of which extends out of the limiting ring and is sleeved on the outside of the limiting rod, and a groove for accommodating the elastic limiting claw is arranged inside the limiting sleeve;

[0027] The spring is arranged on the outside of the limiting sleeve and is located between the base and the limiting sleeve.

[0028] Preferably, the piston movement mechanism further comprises:

[0029] A first sealing structure, disposed between the base and the elastic limiting body;

[0030] The second sealing structure is arranged between the piston rod and the elastic limiting body.

[0031] Preferably, the pressure transmission component comprises:

[0032] A pipeline joint, arranged on the base and connected to the pressure transmission channel;

[0033] A pressure transmission pipeline is connected to the pipeline joint.

[0034] Preferably, the anchor support device for drilling further includes a limit block, a travel pin, a shear pin and a release pin, wherein:

[0035] The limiting block is arranged in the second semicircular groove through a limiting pin;

[0036] The travel pin, shear pin and release pin are arranged on the limit sleeve in sequence, and the travel pin is arranged close to the piston rod.

[0037] Preferably, a first groove is provided on the circumferential surface of the first body, and the first slip is installed in the first groove and fixed by a slip fixing pin;

[0038] A second groove is arranged on the circumferential surface of the second main body, and the second slip is installed in the second groove and fixed by a slip fixing pin.

[0039] The present invention provides an anchoring support device for drilling, including a first anchoring mechanism, a second anchoring mechanism and a piston movement mechanism. The first anchoring mechanism includes a first main body and a first slip arranged on the first main body, and the second anchoring mechanism includes a second main body and a second slip arranged on the second main body, and the lower end surface of the first main body is set as a first wedge-shaped inclined surface, and the upper end surface of the second main body is set as a second wedge-shaped inclined surface that can cooperate with the first wedge-shaped inclined surface. The wedge-shaped structure design is adopted, the outer diameter of the tool is small, and the gap with the casing is large during the lowering process, which can effectively avoid the drilling tool from getting stuck. A piston movement mechanism is set between the first anchoring mechanism and the second anchoring mechanism to radially displace the first anchoring mechanism and the second anchoring mechanism, so that the anchoring support device for drilling has a recyclable function, which can meet the needs of re-entering other tools in the main wellbore and broaden the application scope of branch well technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0041] Figure 1 It is a structural schematic diagram of an embodiment of an anchor support device for drilling of the present invention;

[0042] Figure 2 yes Figure 1 Schematic diagram of the explosion structure;

[0043] Figure 3 It is a schematic structural diagram of the first main body in the anchor support device for drilling of the present invention;

[0044] Figure 4 It is a schematic structural diagram of the second main body in the anchor support device for drilling of the present invention;

[0045] Figure 5 It is a schematic structural diagram of a base in the anchor support device for drilling of the present invention;

[0046] Figure 6 It is a schematic cross-sectional view of the anchor support device for drilling of the present invention;

[0047] Figure 7 yes Figure 6 A schematic diagram of the enlarged structure at A in the middle;

[0048] Figure 8 It is a schematic diagram of the structure of the pin shear in the anchor support device for drilling of the present invention;

[0049] Fig. 9 yes Figure 8 A schematic diagram of the enlarged structure at B in the middle;

[0050] Fig.10 It is a structural schematic diagram of the limit rod in the anchor support device for drilling of the present invention touching the release pin;

[0051] Fig.11 yes Fig.10 Schematic diagram of the enlarged structure at C in the middle;

[0052] Fig.12 It is a schematic structural diagram of the elastic limiting claw in the anchor support device for drilling of the present invention being disengaged;

[0053] Fig.13 yes Fig.12 Schematic diagram of the enlarged structure at D in the middle;

[0054] Fig.14 It is a structural schematic diagram of the anchoring state of the anchoring support device for drilling of the present invention;

[0055] Fig.15 yes Fig.14 Schematic diagram of the enlarged structure at E in the middle.

[0056] In the figure: 1, first anchoring mechanism; 11, first main body; 110, first semicircular groove; 111, first wedge-shaped inclined surface; 112, first connecting structure; 113, first groove; 114, limiting ring; 12, first slip; 13, slip fixing pin;

[0057] 2. second anchoring mechanism; 21. second main body; 210. second semicircular groove; 211. second wedge-shaped inclined surface; 212. second connecting structure; 213. second groove; 214. step structure; 22. second slip;

[0058] 3. Piston movement mechanism; 31. Base; 310. Pressure transmission channel; 311. First body; 3110. Groove; 312. Second body; 3120. First sealing groove; 313. First boss; 32. Piston assembly; 321. Piston rod; 322. Limit rod; 33. Pressure transmission assembly; 331. Pipeline joint; 332. Pressure transmission pipeline; 34. Elastic limiting body; 341. Second boss; 342. Elastic limiting claw; 35. Limiting sleeve; 350. Groove; 351. Body; 352. Extension; 353. Limiting boss; 36. Spring; 37. First sealing structure; 38. Second sealing structure;

[0059] 4. Limit block; 5. Travel pin; 6. Shear pin; 7. Release pin. DETAILED DESCRIPTION

[0060] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0061] In the description of the present invention, it is to be understood that the terms “center”, “lateral”, “length”, “width”, “height”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “side”, etc., indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0062] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0063] Figure 1 Schematic diagram of the structure of this embodiment. Figure 1 As shown, this embodiment provides an anchoring support device for drilling, including a first anchoring mechanism 1, a second anchoring mechanism 2 and a piston movement mechanism 3.

[0064] Figure 2 yes Figure 1 Schematic diagram of the explosion structure, such as Figure 2 As shown, the first anchoring mechanism 1 includes a first body 11 and a first slip 12 arranged on the first body 11. The lower end surface of the first body 11 is arranged as a first wedge-shaped inclined surface 111. The first side of the first body 11 is arranged with a first connecting structure 112 for connecting with an upper drilling tool. In this embodiment, the first connecting structure 112 includes a threaded structure.

[0065] The second anchoring mechanism 2 includes a second body 21 and a second slip 22 disposed on the second body 21. The upper end surface of the second body 21 is provided as a second wedge-shaped inclined surface 211 capable of cooperating with the first wedge-shaped inclined surface 111. The first side of the second body 21 is provided with a second connecting structure 212 for connecting with a lower drilling tool. In this embodiment, the second connecting structure 212 includes a threaded structure.

[0066] The piston movement mechanism 3 is disposed between the first anchoring mechanism 1 and the second anchoring mechanism 2 , and is used to make the first anchoring mechanism 1 and the second anchoring mechanism 2 radially misaligned.

[0067] The anchoring support device for drilling includes a first anchoring mechanism 1, a second anchoring mechanism 2 and a piston movement mechanism 3. The first anchoring mechanism 1 includes a first main body 11 and a first slip 12 arranged on the first main body 11, and the second anchoring mechanism 2 includes a second main body 21 and a second slip 22 arranged on the second main body 21. The lower end surface of the first main body 11 is set as a first wedge-shaped inclined surface 111, and the upper end surface of the second main body 21 is set as a second wedge-shaped inclined surface 211 that can cooperate with the first wedge-shaped inclined surface 111. The wedge-shaped structure design is adopted, the outer diameter of the tool is small, and the gap with the casing is large during the lowering process, which can effectively avoid the drilling tool from getting stuck. The piston movement mechanism 3 is set between the first anchoring mechanism 1 and the second anchoring mechanism 2 to make the first anchoring mechanism 1 and the second anchoring mechanism 2 radially displaced, so that the anchoring support device for drilling has a recyclable function, which can meet the needs of re-entering other tools in the main wellbore and broaden the application scope of branch well technology.

[0068] Figure 3 is a schematic diagram of the structure of the first main body in this embodiment, such as Figure 3 As shown, a first semicircular groove 110 is provided in the middle of the first wedge-shaped inclined surface 111 ; a first groove 113 is provided on the circumferential surface of the first body 11 , and the first slip 12 is installed in the first groove 113 and fixed by a slip fixing pin 13 .

[0069] Figure 4 is a schematic diagram of the structure of the second main body in this embodiment, such as Figure 4 As shown, in this embodiment, a second semicircular groove 210 is provided in the middle of the second wedge-shaped inclined surface 211; a second groove 213 is provided on the circumferential surface of the second body 21, and the second slip 22 is installed in the second groove 213 and fixed by the slip fixing pin 13.

[0070] A piston movement mechanism accommodating groove is formed between the first semicircular groove 110 and the second semicircular groove 210 for accommodating the piston movement mechanism 3 .

[0071] As an optional implementation, Figure 1 and Figure 2 As shown, the piston movement mechanism 3 includes a base 31 , a piston assembly 32 and a pressure transmission assembly 33 .

[0072] Among them, the base 31 is connected to the second anchoring mechanism 2; the piston assembly 32 can drive the first anchoring mechanism 1 to move along the second wedge-shaped inclined surface 211, so that the first anchoring mechanism 1 and the second anchoring mechanism 2 are radially misaligned; the pressure transmission assembly 33 can pass through the base 31 to act on the piston assembly 32.

[0073] When the side-drilling branch well needs anchoring, the first anchoring mechanism 1 and the second anchoring mechanism 2 can achieve radial dislocation under the push of the piston movement mechanism 3, and push the slips to "bite" the casing to achieve hanging.

[0074] Specifically, Figure 5 Schematic diagram of the structure of the base in this embodiment. Figure 5 As shown, the base 31 in this embodiment includes an integrally formed first body 311, a second body 312 and a first boss 313, the first boss 313 is arranged between the first body 311 and the second body 312, and the cross-sectional diameters of the first boss 313, the first body 311 and the second body 312 decrease successively.

[0075] A pressure transmission channel 310 is disposed in the base 31 , and the pressure transmission channel 310 passes through the first body 311 , the second body 312 and the first boss 313 .

[0076] The outer surface of the first body 311 is provided with a groove 3110 for connecting to the second anchoring mechanism 2, and the outer surface of the second body 312 is provided with a first sealing groove 3120 for accommodating the first sealing structure 37. Optionally, in this embodiment, a step structure 214 is provided on the second side of the second body 21, and the groove 3110 is cooperatively connected with the step structure 214 to ensure the stability of the connection.

[0077] As an optional implementation, Figure 6 yes Figure 1 Schematic diagram of the cross-sectional structure, Figure 7 yes Figure 6 The enlarged structural diagram at A in the figure is as follows: Figure 2 , Figure 6 and Figure 7 As shown, the piston assembly 32 in this embodiment includes a piston rod 321 and a limiting rod 322. A limiting ring 114 capable of extending into the second semicircular groove 210 is provided on the second side of the first body 11. The limiting rod 322 can extend from the limiting ring 114. The piston rod 321 is provided between the base 31 and the limiting rod 322.

[0078] In order to avoid the problem that the slips of the existing recyclable tools are in a free-moving state after being unsealed, and the slips may fall out at any time during the recovery process, causing incorrect anchoring and causing the drill bit to get stuck, the piston movement mechanism 3 in this embodiment also includes an elastic limiting body 34, a limiting sleeve 35 and a spring 36.

[0079] The elastic limiting body 34 includes a hollow structure, one end of which is provided with a second boss 341 connected to the base 31 , and the other end of which is provided with an elastic limiting claw 342 .

[0080] Specifically, in this embodiment, the second body 312 of the base 31 extends into the second boss 341. Optionally, the base 31 is connected to the elastic limiting body 34 through threads. The piston assembly 32 is disposed in the hollow structure.

[0081] One end of the limiting sleeve 35 is sleeved on the outside of the elastic limiting body 34 and abuts against the second boss 341, and the other end extends out of the limiting ring 114 and is sleeved on the outside of the limiting rod 322. The inside of the limiting sleeve 35 is provided with a groove 350 for accommodating the elastic limiting claw 342. In this embodiment, by providing the limiting ring 114 at the lower end of the first body 11, cooperating with the axial hole of the limiting sleeve 35, and limiting in a step manner, stability during use can be ensured.

[0082] The spring 36 is arranged on the outside of the limiting sleeve 35, and is located between the base 31 and the limiting sleeve 35. In this embodiment, the limiting sleeve 35 includes a main body 351 and an extension portion 352, and a limiting boss 353 is arranged between the main body 351 and the extension portion 352. One end of the spring 36 abuts on the first boss 313, and the other end abuts on the limiting boss 353. The extension portion 352 is sleeved on the outside of the limiting rod 322.

[0083] By providing the elastic limiting body 34, the limiting sleeve 35 and the spring 36, the anchoring support device for drilling has a self-locking function, which can prevent the slips from moving freely.

[0084] As an optional implementation, in order to solve the problem that the existing anchoring support tools adopt a double piston structure or above, have numerous sealing mechanisms, high processing costs, and a high risk of sealing leakage, the piston movement mechanism 3 in this embodiment includes a first sealing structure 37 and a second sealing structure 38.

[0085] The first sealing structure 37 is disposed between the base 31 and the elastic limiting body 34 ; the second sealing structure 38 is disposed between the piston rod 321 and the elastic limiting body 34 .

[0086] With such a configuration, the anchor support device for drilling only uses a single piston and two sets of sealing structures. Under the premise of meeting the use requirements, there are fewer sealing mechanisms, the probability of sealing failure is low, and the processing cost is greatly reduced, the risk of sealing leakage is small, and it is safer and more reliable when used.

[0087] As an optional implementation, the pressure transmission assembly 33 in this embodiment includes a pipeline joint 331 and a pressure transmission pipeline 332. The pipeline joint 331 is arranged on the base 31 and communicates with the pressure transmission channel 310; the pressure transmission pipeline 332 is connected to the pipeline joint 331.

[0088] As an optional embodiment, the anchoring support device for drilling further includes a limit block 4, a travel pin 5, a shear pin 6 and a release pin 7.

[0089] The limit block 4 is arranged in the second semicircular groove 210 through the limit pin; the travel pin 5, the shear pin 6 and the release pin 7 are arranged on the limit sleeve 35 in sequence, and the travel pin 5 is arranged close to the piston rod 321.

[0090] Specifically, the travel pin 5, shear pin 6 and release pin 7 in this embodiment are all arranged on the extension portion 352 of the limit sleeve 35, and the limit sleeve 35 limits the movement range of the limit rod and the piston rod 321 through the travel pin 5, shear pin 6 and release pin 7.

[0091] The working principle of this embodiment is:

[0092] like Figure 6 and Figure 7 As shown, during the side drilling of the branch well, when the drilling anchoring support device is lowered, the radial displacement between the first anchoring mechanism 1 and the second anchoring mechanism 2 is small, which can ensure that the outer diameter of the tool is small. The limiting rod 322 limits the elastic limiting body 34 in the groove 350 of the limiting sleeve 35 to prevent the first anchoring mechanism 1 and the second anchoring mechanism 2 from freely displacing and causing premature cava anchoring.

[0093] like Figure 8-Figure 13 As shown, after the anchor support device for drilling is lowered into place, the pressure transmission pipeline 332 is pressurized by a mud pump, and the pressure is transmitted from the pipeline joint 331 through the pressure transmission channel 310 of the base 31, pushing the piston rod 321 to move, and the piston rod 321 pushes the limit rod 322 to move during the movement. When the pressure reaches a certain level, the limit rod 322 shears the shear pin 6, and the piston rod 321 pushes the limit rod 322 to continue moving until it hits the release pin 7, and the elastic limit claw 342 of the elastic limit body 34 escapes from the groove 350.

[0094] like Fig.14 and Fig.15 As shown, the pressure continues. Since the piston rod 321 and the limit rod 322 are limited by the release pin 7, the first anchoring mechanism 1 and the second anchoring mechanism 2 are radially displaced relative to each other, and the cava begins to bite into the casing. The first anchoring mechanism 1 continues to move until the lower end surface touches the limit block 4. At this time, the piston cavity no longer changes, and the pressure increases sharply, indicating that the cava is anchored in place.

[0095] The pressure transmission pipeline 332 is disconnected and the side drilling branch well operation is started. During the operation, the drilling anchor support device is always under pressure, and the radial displacement of the first anchor mechanism 1 and the second anchor mechanism 2 tends to increase, ensuring the reliability of the slip "biting" into the casing.

[0096] After completing the side drilling of the branch well, the radial displacement of the first anchoring mechanism 1 and the second anchoring mechanism 2 is reduced through the drilling anchoring support device, and the slip is separated from the casing. Under the action of the second anchoring mechanism 2's own weight, the base 31 pushes the elastic limiting body 34 back into the groove 350 of the limiting sleeve 35, and the elastic limiting claw 342 of the elastic limiting body 34 cooperates with the groove 350 to achieve self-locking, so as to prevent the first anchoring mechanism 1 and the second anchoring mechanism 2 from moving freely when the tool is recovered, resulting in mis-anchoring and causing drill jamming.

[0097] This drilling anchoring support device, on the one hand, reduces the outer diameter of the tool and the number of sealing mechanisms through structural design and optimization, reduces the risk of sticking and tool failure during the drilling process, and improves the success rate of the operation; on the other hand, through the design of a recoverable function and self-locking function, it can meet the needs of subsequent re-entry of other tools into the main wellbore and avoid accidental anchoring during the recovery of the anchoring tool.

[0098] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An anchor support device for drilling, characterized in that: include: A first anchoring mechanism comprises a first body and a first slip arranged on the first body, wherein the lower end surface of the first body is arranged as a first wedge-shaped inclined surface, and a first side of the first body is arranged as a first connecting structure for connecting with an upper drilling tool; A second anchoring mechanism comprises a second body and a second slip disposed on the second body, wherein the upper end surface of the second body is disposed as a second wedge-shaped inclined surface capable of cooperating with the first wedge-shaped inclined surface, and a first side of the second body is disposed with a second connecting structure for connecting with a lower drilling tool; The piston movement mechanism is arranged between the first anchoring mechanism and the second anchoring mechanism, and is used to make the first anchoring mechanism and the second anchoring mechanism radially misaligned.

2. The anchor support device for drilling according to claim 1, characterized in that: A first semicircular groove is arranged in the middle of the first wedge-shaped inclined surface, and a second semicircular groove is arranged in the middle of the second wedge-shaped inclined surface. A piston movement mechanism accommodating groove is formed between the first semicircular groove and the second semicircular groove for accommodating the piston movement mechanism.

3. The anchor support device for drilling according to claim 2, characterized in that: The piston movement mechanism comprises: a base connected to the second anchoring mechanism; A piston assembly capable of driving the first anchoring mechanism to move along the second wedge-shaped inclined surface so that the first anchoring mechanism and the second anchoring mechanism are radially misaligned; The pressure transmission component can pass through the base to act on the piston component.

4. The anchor support device for drilling according to claim 3, characterized in that: The base includes an integrally formed first body, a second body and a first boss, the first boss is arranged between the first body and the second body, and the cross-sectional diameters of the first boss, the first body and the second body decrease in sequence, wherein: A pressure transmission channel is arranged in the base; The outer surface of the first body is provided with a groove for connecting with the second anchoring mechanism; The outer surface of the second body defines a first sealing groove for accommodating a sealing structure.

5. An anchor support device for drilling according to claim 3 or 4, characterized in that: The piston assembly includes a piston rod and a limiting rod. The second side of the first body is provided with a limiting ring that can extend into the second semicircular groove. The limiting rod can extend from the limiting ring. The piston rod is arranged between the base and the limiting rod.

6. The anchor support device for drilling according to claim 5, characterized in that: The piston movement mechanism also includes: The elastic limiting body comprises a hollow structure, one end of which is provided with a second boss connected to the base, and the other end of which is provided with an elastic limiting claw; the piston assembly is arranged in the hollow structure; A limiting sleeve, one end of which is sleeved on the outside of the elastic limiting body and abuts against the second boss, and the other end of which extends out of the limiting ring and is sleeved on the outside of the limiting rod, and a groove for accommodating the elastic limiting claw is arranged inside the limiting sleeve; The spring is arranged on the outside of the limiting sleeve and is located between the base and the limiting sleeve.

7. The anchor support device for drilling according to claim 6, characterized in that: The piston movement mechanism also includes: A first sealing structure, disposed between the base and the elastic limiting body; The second sealing structure is arranged between the piston rod and the elastic limiting body.

8. The anchor support device for drilling according to claim 4, characterized in that: The pressure transmission component comprises: A pipeline joint, arranged on the base and connected to the pressure transmission channel; A pressure transmission pipeline is connected to the pipeline joint.

9. The anchor support device for drilling according to claim 6, characterized in that: The anchor support device for drilling also includes a limit block, a travel pin, a shear pin and a release pin, wherein: The limiting block is arranged in the second semicircular groove through a limiting pin; The travel pin, shear pin and release pin are arranged on the limit sleeve in sequence, and the travel pin is arranged close to the piston rod.

10. An anchor support device for drilling according to any one of claims 1 to 4, characterized in that: A first groove is provided on the circumferential surface of the first body, and the first slip is installed in the first groove and fixed by a slip fixing pin; A second groove is arranged on the circumferential surface of the second main body, and the second slip is installed in the second groove and fixed by a slip fixing pin.

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