Anchoring device for a lateral drilling system

Abstract

The utility model discloses a kind of anchor jaw formula open hole lateral drilling whip-lay, it includes the guide inclined surface of being equipped with guide inclined body, guide inclined body is connected with central rod, the lower part of central rod is sequentially connected with the center tube equipped with anchor jaw retraction mechanism and the guide shoe equipped with ball-throwing press mechanism in proper order;Anchor jaw retraction mechanism is mainly composed of anchor jaw and piston, anchor jaw installed in center tube is connected with connecting pin through connecting rod installed in piston, piston and limit ring are installed in the outer sleeve connected with center tube;Ball seat is provided in ball-throwing press mechanism, and the sealed ball is seated on ball seat. The whip-lay in the utility model greatly improves the vertical anchoring force to open hole well wall. In open hole lateral drilling construction, the construction mode of cement plug as vertical support is avoided, and the whip-lay is directly used for lateral drilling, and the construction efficiency of open hole lateral drilling well and multi-lateral drilling well can be greatly improved.

Description

Technical Field

[0001] This utility model relates to a guide tool for side-drilling in oil and gas fields, and in particular to an anchor claw type open-hole side-drilling guide tool. Background Technology

[0002] As major domestic oilfields enter the mid-to-late stages of development, reducing costs and increasing efficiency to achieve stable and increased production has become a key objective. Sidetracking is a good development method to achieve this goal. It can rely on existing wellbores to form sidetracked branch wells, utilizing the reservoir around the existing wellbore. This saves on initial exploration costs and main wellbore drilling costs, and has the advantages of low cost and improved reservoir recovery.

[0003] Sidetracking involves drilling into an existing wellbore using either casing-based or open-hole sidetracking to create a sidetracked wellbore. Regardless of the method, a directional drilling rig must be run and set to achieve the desired directional direction. Currently used directional drilling rigs employ a slip mechanism driven by mechanical or fluid pressure for setting. Slips are suitable for securing metal casing walls and perform well in casing-based sidetracking. However, open-hole sidetracking primarily relies on cement plugs to support the directional drilling rig. This is because slips are designed for metal casing walls; for open-hole wells, the inner diameter is larger, and the surface roughness and brittleness increase significantly. Due to limitations in the radial extension length, shape, and contact method with the wellbore, the vertical support effect is poor.

[0004] The directional drilling tools currently used in sidetracking have certain shortcomings for open-hole sidetracking operations, mainly in the following aspects: 1. Insufficient vertical support for open hole wellbore by slip-type directional drilling devices: The directional drilling devices currently used in sidetracking operations are all slip-type. Axial and circumferential fixation is achieved by slips extending from the directional drilling device cylinder and engaging with the casing. Slips are suitable for engaging with metal surfaces. However, for open hole wellbore walls, due to the increased inner diameter of the wellbore, the irregularity of the wall surface, and the brittleness of the rock, the slips are limited by factors such as the extension length and shape, resulting in poor direct engagement with the open hole wellbore. This reduces the effectiveness of fixing the directional drilling device, especially in providing effective vertical support for the directional drilling tool assembly used on the guide plane. 2. Low efficiency and difficulty in moving the tubing string in the main wellbore during open-hole sidetracking: Due to insufficient vertical support force of the directional drilling rig, cement plugs are currently the primary method used to provide vertical support for the directional drilling rig during open-hole sidetracking. However, cement plugging complicates the drilling process and reduces the efficiency of sidetracking. Furthermore, it makes it difficult to achieve unimpeded vertical movement of the tubing string when drilling multi-branch sidetracking wells, sometimes requiring the removal of the cement plug.

[0005] Currently, the following related patent technologies have emerged: Patent authorization announcement number CN207538786U discloses a directional drilling tool for open-eye side drilling. The technical solution is as follows: a lower conical body is provided inside the main body, and three lower slips are provided at the lower part of the lower conical body. The lower slips are fixed by lower slip pins. A stop pin is provided at the upper part of the lower conical body, and a sealing ring is provided at the upper part of the stop pin. The upper part of the main body is an inclined body, and a locking pin is provided between the inclined body and the main body. An input connector is connected to the upper part of the input pipe, and the input connector is fixed by an input pin. A limiting tube is provided at the lower part of the input pipe, and an upper slip is provided at the lower part of the limiting tube.

[0006] The beneficial effects of the above-mentioned utility model are: it allows side-drilling operations to be completed in a single trip-up and down-drilling operation, avoiding the problem of insufficient hardness of cement plugs in conventional cement plug drilling. This open-hole side-drilling directional tool has two anchoring positions; after anchoring, the directional tool will not shake or rotate, thus making the depth and direction of the side-drilling point more precise, and also eliminating the operation time occupied by waiting for the cement plug to harden. However, the directional tool's anchoring mechanism still uses a slip-type design, which makes it difficult to overcome the drawbacks of vertical anchoring.

[0007] Patent authorization announcement number CN110397419B discloses a setter for open-hole side-drilling in air drilling, relating to a setter for open-hole side-drilling used in the air drilling field of the oil and gas industry. It solves the problem of difficult fixation of the directional drilling rig in open-hole drilling. The upper end of the control short connector is threadedly connected to the lower end of the directional drilling rig, and the lower end of the control short connector is threadedly connected to the upper end of the oil reservoir body. The air inlet channel and the internal air supply channel of the directional drilling rig are connected. The lower end of the oil reservoir body and the upper end of the pressure boosting cylinder body are fastened with plug screws, and the pressure piston is placed in the inner cavity of the oil reservoir body. The piston end of the pressure boosting piston is placed in the exhaust chamber of the pressure boosting cylinder body, and the piston rod of the pressure boosting piston is placed in the oil inlet throat of the pressure boosting cylinder body. The upper end of the actuating piston is placed in the pressure oil chamber of the pressure boosting cylinder body. The upper end of the anchoring cylinder body and the lower end of the pressure boosting cylinder body are threadedly connected, and the lower end of the anchoring cylinder body and the upper end of the guide shoe are threadedly connected. A cone is placed in the inner cavity of the anchoring cylinder body, and the upper end of the cone is threadedly connected to the lower end of the actuating piston.

[0008] The aforementioned invention converts low-pressure compressed air into high-pressure pressurized oil, ensuring reliable setting of the directional diverter in open-hole sections. However, the aforementioned directional diverter anchoring mechanism still uses a slip-type design, which makes it difficult to overcome the drawbacks of slips for vertical anchoring.

[0009] Patent authorization announcement number CN201071682Y discloses an open-hole side-drilling directional tool, which changes the traditional directional tool slips to needle-shaped ones. Although it has the shape of an anchor claw, it is still a slip-type horizontal telescopic method with limited extension length. Moreover, the needle-shaped anchor claw is subjected to vertical force, which is prone to shearing failure and makes it difficult to apply sufficient clamping force to the open-hole well wall. Summary of the Invention

[0010] The purpose of this invention is to provide an anchor-claw type open-hole sidetracking directional drilling tool, which solves the problems of existing open-hole sidetracking directional drilling tools where the anchoring mechanism uses slips with limited extension length, is prone to shear failure, has difficulty applying sufficient clamping force to the open-hole wellbore, and is difficult to overcome vertical anchoring limitations. Utilizing the large extension diameter of the anchor claw, its easy embedding into the open-hole wellbore, and its strong mechanical strength, it independently and effectively provides vertical support within the open-hole wellbore, eliminating the need for cement plugs, thus improving the efficiency of open-hole sidetracking operations and increasing the economic benefits of sidetracking wells.

[0011] The technical solution of this utility model is: An anchor-claw type open-hole side-drilling directional tool includes a guide body with a guide surface, wherein: The guide body is connected to the central rod, and the lower part of the central rod is connected in sequence to the central tube equipped with the anchor claw tensioning mechanism and the guide shoe equipped with the ball throwing and pressing mechanism. The anchor claw tensioning mechanism mainly consists of an anchor claw and a piston. The anchor claw installed in the central tube is connected to the connecting rod installed in the piston by a connecting pin. The piston and the limiting ring are installed in the outer sleeve connected to the central tube. The ball-throwing and pressing mechanism has a ball seat on which the sealed ball is thrown.

[0012] Preferably, the upper end of the center rod is threaded to the upper connector and the lower end is threaded to the center pipe; the guide surface on the upper part of the guide body is connected to the straightening ring installed outside the center rod by a straightening ring shear pin.

[0013] Preferably, the outer circle of the central tube is a stepped outer circle with the outer diameter decreasing sequentially from top to bottom; the anchor claw is installed in the anchor claw mounting groove on the upper outer circle of the central tube by the anchor claw mounting pin; the internal thread of the lower central hole of the outer sleeve is connected to the thread on the lower outer circle of the central tube; the ball throwing and pressing mechanism is connected to the lower part of the central tube through the connecting sleeve therein.

[0014] Preferably, the anchor claw mounting groove is a groove set in the outer circular step of the upper part of the central tube, and a downwardly penetrating longitudinal groove for anchor claw extension is opened on the outer wall of the anchor claw mounting groove; the number of the longitudinal grooves for anchor claw extension is equal to the number of anchor claws installed, and the anchor claw mounting pin is fixed in the longitudinal groove for anchor claw extension and connected to the anchor claw; the anchor claw with a wedge-shaped claw tip can extend and retract in the longitudinal groove for anchor claw extension.

[0015] Preferably, the connecting rod has a fork-shaped structure, the upper body is a U-shaped groove, and the connecting pin is installed in the U-shaped groove of the connecting rod and connected to the lower body of the anchor claw installed in the U-shaped groove; the lower body of the connecting rod is connected to the connecting rod mounting pin installed in the upper body of the piston; the anchor claw and the connecting rod are provided in three or more sets.

[0016] Preferably, the upper body of the piston is provided with a connecting rod mounting groove, the connecting rod mounting groove is connected to the upper end of the piston and has a longitudinal groove that is connected to the outer circle of the piston; the lower body of the connecting rod can be inserted into the longitudinal groove and connected to the connecting rod mounting pin installed in the longitudinal groove.

[0017] Preferably, the inner circle of the outer sleeve is a stepped inner circle and the lower central hole is provided with an internal thread that is connected to the central pipe thread. One or more shear pins are installed between the limiting ring installed inside the outer sleeve and the outer sleeve.

[0018] Preferably, the piston has a sealing ring on its inner circle and its upper body is mounted on the upper end of the outer sleeve, allowing the piston to move up and down along the central tube.

[0019] Preferably, the central hole of the guide shoe 12 is threadedly connected to the lower tube of the ball seat, and the outer circle of the upper tube of the ball seat is threadedly connected to the connecting sleeve installed in the guide shoe. The guide shoe and the ball-throwing and pressing mechanism are connected to the lower part of the central tube through the connecting sleeve.

[0020] Preferably, the open-hole side-drilling directional tool is connected to the lower end of the drill rod column via the upper internal thread in the upper connector.

[0021] Compared with the prior art, the significant advantages of this utility model are as follows: This invention is specifically designed for open-hole sidetracking operations. Due to the piston and connecting rod incorporated in this directional drilling tool, the extension length of the anchor claw can be significantly increased. The design of the anchor claw tip, especially under the weight of the tubing string, makes it easier to embed into the open-hole wall. Simultaneously, the high mechanical strength of the anchor claw arm allows it to independently and effectively provide vertical support within the open-hole wall, eliminating the need for cement plugs and significantly improving the efficiency of open-hole sidetracking operations.

[0022] This invention utilizes an anchor claw tensioning mechanism comprised of an anchor claw, connecting rod, and piston as the support structure for the directional drilling rig in open-hole sidetracking. This significantly increases the opening diameter of the anchor claw, enhances the contact adaptability and mechanical strength between the anchor claw tensioning mechanism and the wellbore, and substantially improves the vertical anchoring force on the open-hole wellbore. It eliminates the need for cement plugs as vertical supports in open-hole sidetracking operations, allowing for direct use of this directional drilling rig and resulting in a significant improvement in construction efficiency for both open-hole and multi-branch sidetracking.

[0023] This invention solves the problem of traditional slip-type directional drilling tools being difficult to anchor, especially longitudinally, in open holes. It eliminates the need for cement plugging during open-hole sidetracking, reducing construction steps. The expandable and retractable anchor claw mechanism also enables multi-depth, multi-directional drilling within the same wellbore using the same directional tool, meeting the needs of multiple directional drilling operations in open-hole multi-branch sidetracking and improving operational efficiency and safety. This significantly improves the construction efficiency of open-hole multi-branch sidetracking, reduces production costs, and increases economic benefits. Attached Figure Description

[0024] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the structure of this utility model.

[0025] Figure 2 yes Figure 1 A schematic diagram of the middle anchoring mechanism.

[0026] Figure 3 yes Figure 2 A schematic diagram of the middle anchor claw in the open state.

[0027] In the picture: 1. Upper connector; 2. Straightening ring shear nail; 3. Straightening ring; 4. Guide slope; 5. Guide slope body; 6. Center rod; 7. Center tube; Anchor claw tensioning mechanism 8: Anchor claw mounting pin 81, anchor claw 82, connecting pin 83, connecting rod 84, connecting rod mounting pin 85, piston 86, rubber ring 87; Outerwear 9, Limiting ring 10; Throwing and pressing mechanism 11: sealing ball 111, ball seat 112, connecting sleeve 113; Shoe 12. Detailed Implementation

[0028] The accompanying drawings are for reference and illustration only and are not intended to limit the scope of protection of this utility model. The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0030] In the description of this utility model, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, in the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0031] See Figure 1 - Figure 3 An anchor-claw type open-hole side-drilling directional tool includes a guide body 5 with a guide surface 4, wherein: The guide body 5 is connected to the central rod 6, and the lower part of the central rod 6 is sequentially connected to the central tube 7 equipped with the anchor claw tensioning mechanism 8 and the guide shoe 12 equipped with the ball throwing and pressing mechanism 11. The anchor claw tensioning mechanism 8 is mainly composed of anchor claw 82 and piston 86. The anchor claw 82 installed in the central tube 7 is connected to the connecting rod 84 installed in the piston 86 by a connecting pin 83. The piston 86 and the limiting ring 10 are installed in the outer sleeve 9 connected to the central tube 7. The ball-throwing and pressing mechanism 11 is equipped with a ball seat 112, on which the sealed ball 111 is thrown and sits.

[0032] To address the shortcomings of existing open-hole sidetracking directional drilling anchoring mechanisms, such as limited slip extension length, difficulty in applying sufficient clamping force to the open-hole wellbore, and susceptibility to shear failure, which hinder vertical anchoring, this invention utilizes an anchor claw tensioning mechanism 8. Leveraging the large extension length of the commonly used anchor claw 82, its easily embedded claw tip shape within the open-hole wellbore, and the strong mechanical strength of the claw arm formed with the connecting rod 84, this device can independently and effectively provide vertical support for the sidetracking tool assembly within the open-hole wellbore, eliminating the need for cement plugs and significantly improving the efficiency of open-hole sidetracking operations.

[0033] In this invention, the anchor claw 82 is connected to the connecting rod 84 via a connecting pin 83. The connecting pin 83 moves together with the opening and closing of the anchor claw 82 and the connecting rod 84. The opening and closing of the anchor claw 82 and the connecting rod 84 is achieved by inserting the sealing ball 111 to pressurize the system, using hydraulic pressure to push the piston 86 upward, which in turn causes the connecting rod 84 installed in the piston 86 to move upward, pushing out the anchor claw 82 and embedding it in the wellbore wall of the open-hole side-drilling well. Its operation is reliable. The piston 86, combined with the connecting rod 84, has a long stroke, giving the anchor claw 82 sufficient extension length. The shape of the anchor claw 82's claw tip makes it easy to embed into the rock of the open-hole wellbore wall, especially under the pressure of the upper tubing string, ensuring it is firmly fixed in the wellbore wall of the open-hole side-drilling well. Its claw arm has sufficient mechanical strength to prevent shearing damage. No cement plug is needed, and it does not affect the vertical movement of the construction tubing string in the main wellbore. The effect is significant, effectively improving the economic efficiency of open-hole side-drilling operations.

[0034] Based on the above embodiment one, the present invention also has the following embodiments: In a preferred embodiment: the upper end of the central rod 6 is threaded to the upper connector 1, and the lower end is threaded to the central tube 7; the guide surface 4 on the upper part of the guide body 5 is connected to the straightening ring 3 installed outside the central rod 6 by a straightening ring shear pin 2.

[0035] In a preferred embodiment: the outer circle of the central tube 7 is a stepped outer circle with the outer diameter decreasing sequentially from top to bottom; the anchor claw 82 is installed in the anchor claw mounting groove on the upper outer circle of the central tube 7 through the anchor claw mounting pin 81; the internal thread of the lower central hole of the outer sleeve 9 is connected to the thread on the lower outer circle of the central tube 7; the ball throwing and pressing mechanism 11 is connected to the lower part of the central tube 7 through the connecting sleeve 113 therein.

[0036] In a preferred embodiment: the anchor claw mounting groove is a groove set in the outer circular step of the upper part of the central tube 7, and a downwardly penetrating longitudinal groove for anchor claw extension is opened on the outer wall of the anchor claw mounting groove; the number of the longitudinal grooves for anchor claw extension is equal to the number of anchor claws 82 installed, and the anchor claw mounting pin 81 is fixed in the longitudinal groove for anchor claw extension and connected to the anchor claw 82; the anchor claw 82 with a wedge-shaped claw tip can extend and retract in the longitudinal groove for anchor claw extension.

[0037] In a preferred embodiment: the connecting rod 84 has a fork-shaped structure and an upper body with a U-shaped groove. A connecting pin 83 is installed in the U-shaped groove of the connecting rod 84 and connects to the lower body of the anchor claw 82 installed in the U-shaped groove. The lower body of the connecting rod 84 is connected to a connecting rod mounting pin 85 installed in the upper body of the piston 86. The anchor claw 82 and the connecting rod 84 are provided in three or more sets.

[0038] In a preferred embodiment: the upper body of the piston 86 is provided with a connecting rod mounting groove, which communicates with the upper end of the piston 86 and has a longitudinal groove communicating with the outer circle of the piston 86; the lower body of the connecting rod 84 can be inserted into the longitudinal groove and connected to the connecting rod mounting pin 85 installed in the longitudinal groove. When the piston 86 is pushed upward by hydraulic pressure, the connecting rod 84 and the anchor claw 82 are pushed out from outside the central tube 7, locked, and inserted into the well wall of the side-drilled open hole well.

[0039] In a preferred embodiment, the inner circle of the outer sleeve 9 is a stepped inner circle, and the lower central hole is threaded to connect with the central tube 7. One or more shear pins are installed between the limiting ring 10 installed inside the outer sleeve 9 and the outer sleeve 9. When the sealing ball 111 is injected into the ground and pressurized, the shear pins between the limiting ring 10 and the outer sleeve 9 are broken, and the high-pressure liquid pushes the limiting ring 10 and the piston 86 upward, pushing out the anchor claw 82. When the anchor claw 82 is embedded and supported in the well wall of the side-drilled open hole, the limiting ring 10 falls and sits on the inner stepped inner circle of the outer sleeve 9. The limiting ring 10 prevents the piston 86 from moving upward prematurely when the pressure is insufficient.

[0040] In a preferred embodiment, the piston 86 has a sealing ring 87 on its inner circle and its upper body is mounted on the upper end of the outer sleeve 9, and the piston 86 can move up and down along the central tube 7.

[0041] In a preferred embodiment: the central hole of the guide shoe 12 is threadedly connected to the lower tube of the ball seat 112, and the outer circle of the upper tube of the ball seat 112 is threadedly connected to the connecting sleeve 113 installed in the guide shoe 12. The guide shoe 12 and the ball-throwing and pressing mechanism are connected to the lower part of the central tube 7 through the connecting sleeve 113.

[0042] In a preferred embodiment, the open-hole side-drilling directional tool is connected to the lower end of the drill rod column via the upper internal thread in the upper connector 1.

[0043] The method of using this utility model includes the following steps: (1) Lowering the device into the well: Connect the device to the lower end of the drill string via the upper connector 1 and send it to the designed well depth. Adjust the orientation of the guide surface 4 to the designed orientation. (2) Insert the sealing ball 111 into the drill string: After the sealing ball 111 reaches the ball seat 112 at the bottom of the present invention, a sealed space is formed in the wellbore; pressurize at the wellhead to cut the shear pin between the limiting ring 10 and the outer sleeve 9, push the piston 86 and the connecting rod 84 upward, so that the anchor claw 82 opens and anchors to the open hole well wall, press down the drill string so that the anchor claw 82 is fully seated and firmly supported; (3) Perform open-hole side-drilling: Run in the side-drilling tool assembly, and perform directional drilling under the action of the guide face 4, followed by stabilizing drilling to drill out the side-drilled wellbore; (4) End of construction: After the side drilling is completed, the utility model is lifted by the drill string. Since the central rod 6 is threadedly connected to the central pipe 7 which is equipped with the anchor claw retraction mechanism 8, the anchor claw 82 can be retracted. The open hole side drilling directional device can be recycled and re-entered to the designed well depth and azimuth of another branch well. (5) Repeat the above steps to realize the side drilling construction of another branch well of a single main well using this utility model.

[0044] The embodiments described above are merely typical examples, but the present invention is not limited to these embodiments. Those skilled in the art can make modifications without departing from the spirit and teachings of the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the inventive spirit and concept of the present invention should be included within the protection scope of the present invention. Therefore, the protection scope is not limited to the above description.

Claims

1. An anchor-claw type open-hole side-drilling directional tool, comprising a guide body with a guide surface, characterized in that, The guide body is connected to the central rod, and the lower part of the central rod is connected in sequence to the central tube equipped with the anchor claw tensioning mechanism and the guide shoe equipped with the ball throwing and pressing mechanism. The anchor claw tensioning mechanism mainly consists of an anchor claw and a piston. The anchor claw installed in the central tube is connected to the connecting rod installed in the piston by a connecting pin. The piston and the limiting ring are installed in the outer sleeve connected to the central tube. The ball-throwing and pressing mechanism has a ball seat on which the sealed ball is thrown.

2. The anchor-claw type open-hole side-drilling directional tool as described in claim 1, characterized in that, The upper end of the central rod is threaded to the upper connector, and the lower end is threaded to the central pipe; the guide surface on the upper part of the guide body is connected to the straightening ring installed outside the central rod by a straightening ring shear pin.

3. A claw-type open-hole side-drilling directional tool as described in claim 1 or 2, characterized in that, The outer circle of the central tube is a stepped outer circle with the outer diameter decreasing from top to bottom; the anchor claw is installed in the anchor claw mounting groove on the upper outer circle of the central tube by the anchor claw mounting pin; the internal thread of the lower central hole of the outer sleeve is connected to the thread on the lower outer circle of the central tube; the ball throwing and pressing mechanism is connected to the lower part of the central tube through the connecting sleeve therein.

4. The anchor-claw type open-hole side-drilling directional tool as described in claim 3, characterized in that, The anchor claw mounting groove is a groove set in the outer circular step of the upper part of the central tube, and a downward through-groove longitudinal groove for anchor claw expansion is opened on the outer wall of the anchor claw mounting groove; the number of the anchor claw expansion longitudinal grooves is equal to the number of anchor claws installed, and the anchor claw mounting pin is fixed in the anchor claw expansion longitudinal groove and connected to the anchor claw. Anchor claws with wedge-shaped tips can extend and retract within the longitudinal groove for anchor claw extension and retraction.

5. The anchor-claw type open-hole side-drilling directional tool as described in claim 4, characterized in that, The connecting rod has a fork-shaped structure and an upper body with a U-shaped groove. A connecting pin is installed in the U-shaped groove of the connecting rod and connects to the lower body of the anchor claw installed in the U-shaped groove. The lower body of the connecting rod is connected to the connecting rod mounting pin installed in the upper body of the piston. There are three or more sets of anchor claws and connecting rods.

6. The anchor-claw type open-hole side-drilling directional tool as described in claim 5, characterized in that, The upper body of the piston is provided with a connecting rod mounting groove, which is connected to the upper end of the piston and has a longitudinal groove that is connected to the outer circle of the piston. The lower body of the connecting rod can be inserted into the longitudinal groove and connected to the connecting rod mounting pin installed in the longitudinal groove.

7. The anchor-claw type open-hole side-drilling directional tool as described in claim 3, characterized in that, The inner circle of the outer sleeve is a stepped inner circle and the lower central hole is provided with an internal thread that connects to the central pipe thread. The limiting ring installed inside the outer sleeve is fitted with one or more shear pins between the outer sleeve and the outer sleeve.

8. The anchor-claw type open-hole side-drilling directional tool as described in claim 6, characterized in that, The piston has a sealing ring on its inner circle and its upper body is mounted on the upper end of the outer sleeve. The piston can move up and down along the central tube.

9. The anchor-claw type open-hole side-drilling directional tool as described in claim 3, characterized in that, The central hole of the guide shoe (12) is threadedly connected to the lower tube of the ball seat, and the outer circle of the upper tube of the ball seat is threadedly connected to the connecting sleeve installed in the guide shoe. The guide shoe and the ball-throwing and pressing mechanism are connected to the lower part of the central tube through the connecting sleeve.

10. The anchor-claw type open-hole side-drilling directional tool as described in claim 2, characterized in that, The open-hole side-drilling directional tool is connected to the lower end of the drill rod column via the upper internal thread in the upper connector.

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