Drill bit fishing device for well drilling

Abstract

The utility model provides a drilling bit fishing device, which relates to the technical field of petroleum drilling application and comprises a spindle, a fixed barrel with a downward opening is fixedly connected to the bottom end of the spindle, a liftable movable plate is arranged in the fixed barrel, a plurality of clamping jaws distributed in an annular array are hinged to the bottom surface of the movable plate, and the clamping jaws are arranged on the bottom surface of the movable plate. The side, facing the side wall of the fixing barrel, of the clamping jaw is fixedly connected with wedge-shaped blocks, the inner side of the fixing barrel is provided with a plurality of limiting blocks corresponding to the wedge-shaped blocks in position and number in a one-to-one mode, and by arranging a matching structure of the adjusting bolts, the threaded sleeves, the limiting blocks and the wedge-shaped blocks, an operator can adjust the size of the drill bits according to the drill bits with different size radiuses; the position of the limiting block is accurately adjusted, then the rotatable angle of the clamping jaw is changed, the clamping stability of drill bits of different specifications is effectively improved, and the problems that in the prior art, the rotation angle of the clamping jaw is limited, and clamping of the drill bits of different specifications is unstable are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of petroleum drilling application, especially to a drilling bit fishing device for drilling. BACKGROUND

[0002] Petroleum drilling refers to the work of drilling a cylindrical hole of a certain diameter downward or to one side at a surface position and drilling to a subsurface oil and gas layer, and drilling work needs to be performed by a drilling bit during petroleum drilling, and the drilling bit needs to be fished out after drilling is completed.

[0003] Therefore, a drilling bit fishing device for petroleum drilling in the prior art, with publication number CN212642654U, connects the movable pipe to the main shaft, positions the movable pipe by the sleeve pipe, rotates the sleeve pipe to the bottom end of the main shaft, positions the movable pipe when the sleeve pipe is tightened at the bottom of the main shaft, lowers the main shaft and the movable pipe into the well mouth after operation is completed, positions the drilling bit that needs to be fished out by the movable pipe, moves the drilling bit between the clamping jaws, pulls the movable pipe to move the fixed ring at the same time, makes the movable ring contact the inclined surface of the wedge-shaped block, and moves the wedge-shaped block to drive the clamping jaw to rotate around the bottom end of the fixed shaft, so that the clamping jaw clamps and fixes the drilling bit by the anti-slip pad when the rubber strip and the rubber ring are elastically deformed.

[0004] The size and position of the wedge-shaped block and the limiting ring in the device are fixed structures, which limits the rotation angle of the clamping jaw, and thus the problem of unstable clamping may occur when clamping drilling bits of different radius specifications. INVENTION CONTENTS

[0005] The utility model aims at solving the problems in the prior art and provides a drilling bit fishing device.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a drilling bit fishing device, comprising a main shaft, the bottom end of the main shaft is fixedly connected with a fixed barrel with an opening facing downward, a liftable movable plate is arranged in the fixed barrel, a plurality of clamping jaws arranged in a ring array are hinged to the bottom surface of the movable plate, a wedge-shaped block is fixedly connected to the side of the clamping jaw facing the side wall of the fixed barrel, a plurality of limiting blocks corresponding in position and number to the wedge-shaped blocks are arranged on the inner side of the fixed barrel, a threaded sleeve is fixedly connected to the side of the limiting block facing the side wall of the fixed barrel, a plurality of adjusting bolts are threadedly connected to the side wall of the fixed barrel, and the plurality of adjusting bolts are respectively threadedly connected with the plurality of threaded sleeves.

[0007] Preferably, a hydraulic rod is arranged through the top of the fixed barrel, the piston end of the hydraulic rod is fixedly connected with the movable plate, a prolonging plate is fixedly connected to the fixed end of the hydraulic rod, and a spring is fixedly connected between the prolonging plate and the fixed barrel and is sleeved with the hydraulic rod.

[0008] Preferably, one side of the limiting block facing the fixed barrel side wall is fixedly connected with a limiting sleeve, the fixed barrel side wall is fixedly connected with a plurality of limiting rods, and the plurality of limiting rods are respectively inserted with the plurality of limiting sleeves.

[0009] Preferably, the fixed barrel top is fixedly connected with a square sleeve arranged around the main shaft sleeve, and four dampers are fixedly connected to the side surface of the square sleeve.

[0010] Preferably, the piston end of the damper is fixedly connected with a mounting plate parallel to the main shaft, and the mounting plate is rotatably connected with a roller at both ends.

[0011] Preferably, the outer side of the fixed barrel is fixedly connected with a protective sleeve for protecting the adjusting bolt.

[0012] Compared with the prior art, the advantages and positive effects of the utility model lie in,

[0013] 1、The utility model discloses a cooperation structure of adjusting bolt, threaded sleeve, limiting block and wedge block, and the position of the limiting block can be accurately adjusted according to drill bits of different sizes, and the angle of the clamping jaw can be changed, so that the clamping stability of different specifications of drill bits is effectively improved, and the problems of the limited rotation angle of the clamping jaw and the instability of clamping different specifications of drill bits in the prior art are solved.

[0014] 2、The utility model discloses a hydraulic rod and a spring, after the clamping jaw clamps the drill bit, the hydraulic rod continues to extend and makes the spring relax, the drill bit drives the hydraulic rod and the clamping jaw downward under the action of gravity when lifting, the spring resets, the clamping jaw drives the wedge block to increase the abutting force with the limiting block, the clamping force is increased, the drill bit is prevented from falling off in the fishing process, and the safety of the fishing work is ensured. ACCURACY OF DRAWINGS

[0015] Figure 1 A three-dimensional structure schematic diagram of a drill bit fishing device for drilling is provided for the utility model;

[0016] Figure 2 A side cross-sectional three-dimensional structure schematic diagram of the utility model is provided for Figure 1 ;

[0017] Figure 3 A bottom view three-dimensional structure schematic diagram of the utility model is provided for Figure 1 ;

[0018] Figure 4 An enlarged view of Figure 2 A is provided for

[0019] Legend: 1. Fixed barrel; 2. Main shaft; 3. Damper; 4. Mounting plate; 5. Roller; 6. Protective sleeve; 7. Square sleeve; 8. Hydraulic rod; 9. Spring; 10. Movable plate; 11. Gripper; 12. Wedge block; 13. Circular block; 14. Adjusting bolt; 15. Threaded sleeve; 16. Limit block; 17. Limit rod; 18. Limit sleeve. Detailed Implementation

[0020] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0021] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0022] like Figures 1-4 As shown, a drilling bit retrieval device includes a main shaft 2. A fixed barrel 1 with its opening facing downward is fixedly connected to the bottom end of the main shaft 2. A movable plate 10 that can be raised and lowered is provided inside the fixed barrel 1. Multiple grippers 11 arranged in a circular array are hinged to the bottom surface of the movable plate 10. Wedge blocks 12 are fixedly connected to the side of the grippers 11 facing the side wall of the fixed barrel 1. Multiple limiting blocks 16 are provided inside the fixed barrel 1, which correspond one-to-one with the position and number of the wedge blocks 12. Threaded sleeves 15 are fixedly connected to the side of the limiting blocks 16 facing the side wall of the fixed barrel 1. Multiple adjusting bolts 14 are threadedly connected to the side wall of the fixed barrel 1. The multiple adjusting bolts 14 are threadedly engaged with the multiple threaded sleeves 15 respectively.

[0023] In this technical solution, the main shaft 2 serves as the main supporting component of the entire device. The fixed barrel 1 connected to its bottom provides installation space for the internal components. The liftable movable plate 10 installed inside the fixed barrel 1 provides a power transmission basis for the movement of the gripper 11.

[0024] When the drill bit needs to be retrieved, the movable plate 10 descends. Since the movable plate 10 is hinged to the gripper 11, the gripper 11 descends accordingly. During the descent, the wedge block 12 abuts against the limiting block 16, thereby causing the gripper 11 to rotate. By rotating the adjusting bolt 14, the position of the limiting block 16 can be changed. When dealing with drill bits of different radii, the operator can accurately adjust the position of the limiting block 16 according to the actual specifications of the drill bit by adjusting the adjusting bolt 14, thereby changing the rotatable angle of the gripper 11 and improving the clamping stability.

[0025] like Figure 2As shown, the top of the fixed barrel 1 is provided with a hydraulic rod 8, the piston end of the hydraulic rod 8 is fixedly connected with the movable plate 10, the fixed end of the hydraulic rod 8 is fixedly connected with the extension plate 13, and the extension plate 13 is fixedly connected with the fixed barrel 1, and the spring 9 is sleeved and installed on the hydraulic rod 8.

[0026] In the technical solution, by setting the spring 9, in the process that the hydraulic rod 8 is stretched to drive the rotation of the clamping jaw 11, the clamping jaw 11 clamps the drill bit, at this time, the hydraulic rod 8 continues to stretch a certain length to drive the spring 9 to relax, then the main shaft 1 drives the drill bit to move upward, at this time, under the action of gravity, the drill bit moves downward, the clamping jaw 11 is clamped and fixed with the drill bit, so as to move downward and drive the hydraulic rod 8 to move downward and the spring 9 to reset, at this time, the clamping jaw 11 moves downward to drive the wedge block 12 to move downward, so as to increase the abutting force with the limiting block 16, thereby increasing the clamping force of the clamping jaw 11 on the drill bit, so as to form stable clamping.

[0027] As shown in the figure, Figure 4 The limiting block 16 is fixedly connected with a limiting sleeve 18 on the side facing the side wall of the fixed barrel 1, the side wall of the fixed barrel 1 is fixedly connected with a plurality of limiting rods 17, and the plurality of limiting rods 17 are respectively inserted with the plurality of limiting sleeves 18.

[0028] In the technical solution, the limiting sleeve 18 and the limiting rod 17 are arranged to limit the movement direction of the limiting block 16.

[0029] As shown in the figure, Figure 1 The top of the fixed barrel 1 is fixedly connected with a square sleeve 7 sleeved with the main shaft 2, four dampers 3 are fixedly connected with the side of the square sleeve 7, the four dampers 3 are arranged circumferentially around the side of the square sleeve 7, the piston end of the damper 3 is fixedly connected with the mounting plate 4 parallel to the main shaft 2, and the two ends of the mounting plate 4 are rotatably connected with the rollers 5.

[0030] In the technical solution, the damper 3 can effectively absorb the vibration and impact energy, the rollers 5 are arranged, the rolling friction of the rollers 5 is smaller than the direct sliding friction, the friction between the device and the well wall is reduced, and the movement of the fishing device in the well is more smooth.

[0031] As shown in the figure, Figure 1 The outer side of the fixed barrel 1 is fixedly connected with a protective sleeve 6 for protecting the adjusting bolt 14.

[0032] Working principle: according to the size of the fishing bit, rotate the adjusting bolt 14 to the size of the fishing bit, lower the main shaft 2 with the fishing device into the well, make the fixed barrel 1 close to the bit, start the hydraulic rod 8, the piston end of the hydraulic rod 8 pushes the movable plate 10 to descend. Because the movable plate 10 is hinged with the clamp jaw 11, the clamp jaw 11 descends, the wedge block 12 abuts against the limiting block 16 in the descending process, promotes the rotation of the clamp jaw 11, gradually approaches and clamps the bit, when the clamp jaw 11 clamps the bit, the hydraulic rod 8 continues to extend a certain length, drives the spring 9 to relax, then pulls up the main shaft 2, under the action of gravity, the bit has a downward movement tendency, but the clamp jaw 11 has clamped the bit, so the clamp jaw 11 drives the hydraulic rod 8 to move downward, at the same time, the spring 9 resets, in this process, the downward movement of the clamp jaw 11 drives the wedge block 12 to move downward, increases the abutting force of the wedge block 12 and the limiting block 16, thereby increasing the clamping force of the clamp jaw 11 on the bit, realizing stable clamping.

[0033] The wiring diagram of the hydraulic rod 8 and the damper 3 in the utility model belongs to the common knowledge in the field, and the working principle is a known technology, and the model is selected according to actual use, so the control mode and wiring arrangement of the hydraulic rod 8 and the damper 3 are not explained in detail.

[0034] The above is only the preferred embodiment of the utility model, and does not limit the utility model in other forms, and any skilled person in the art can change or modify the above disclosed technical content into equivalent embodiments applied to other fields, but any simple modification, equivalent change and modification made according to the technical essence of the utility model to the above embodiments still belong to the protection scope of the utility model technical scheme.

Claims

1. A drill bit fishing device for use in drilling a well, comprising a main shaft (2), characterised in that: The bottom end of the main shaft (2) is fixedly connected with a fixed barrel (1) with an opening downward, the inside of the fixed barrel (1) is provided with a liftable movable plate (10), the bottom surface of the movable plate (10) is hingedly connected with a plurality of clamping jaws (11) arranged in an annular array, one side of the clamping jaw (11) facing the side wall of the fixed barrel (1) is fixedly connected with a wedge block (12), the inside of the fixed barrel (1) is provided with a plurality of limiting blocks (16) corresponding in position and number to the wedge blocks (12), one side of the limiting block (16) facing the side wall of the fixed barrel (1) is fixedly connected with a threaded sleeve (15), the side wall of the fixed barrel (1) is threadedly connected with a plurality of adjusting bolts (14), and the plurality of adjusting bolts (14) are respectively threadedly sleeved with the plurality of threaded sleeves (15).

2. The drill bit fishing device for drilling a well of claim 1, wherein: The top of the fixed barrel (1) is provided with a hydraulic rod (8) penetrating through, the piston end of the hydraulic rod (8) is fixedly connected with the movable plate (10), and the fixed end of the hydraulic rod (8) is fixedly connected with an extension plate (13), and the extension plate (13) and the fixed barrel (1) are fixedly connected with a spring (9) sleeved with the hydraulic rod (8).

3. The drill bit fishing device for drilling a well of claim 1, wherein: One side of the limiting block (16) facing the side wall of the fixed barrel (1) is fixedly connected with a limiting sleeve (18), and the side wall of the fixed barrel (1) is fixedly connected with a plurality of limiting rods (17), and the plurality of limiting rods (17) are respectively inserted with the plurality of limiting sleeves (18).

4. The drill bit fishing device of claim 1, wherein: The top of the fixed barrel (1) is fixedly connected with a square sleeve (7) sleeved with the main shaft (2), four dampers (3) are fixedly connected to the side of the square sleeve (7).

5. The drill bit fishing device of claim 4, wherein: The piston end of the damper (3) is fixedly connected with a mounting plate (4) parallel to the main shaft (2), and the both ends of the mounting plate (4) are rotatably connected with a roller (5).

6. The drill bit fishing device of claim 1, wherein: The outside of the fixed barrel (1) is fixedly connected with a protective sleeve (6) for protecting the adjusting bolt (14).

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