Introduction type high-hardness female tap

Abstract

The utility model relates to the technical field of lead-in type female taps, and discloses a lead-in type high-hardness female tap which comprises a protective cover, a clamping assembly is arranged in the protective cover and comprises a hydraulic cylinder, the output end of the hydraulic cylinder is fixedly connected with a push rod, the bottom of the push rod is fixedly connected with a movable block, and the movable block is fixedly connected with a nut. A plurality of rotating seats are fixedly connected to the outer walls of the hydraulic cylinder and the movable block, rocker arms are rotatably connected to the inner walls of the rotating seats, connecting arms are arranged on the side walls of the rocker arms, clamps are fixedly connected to the bottoms of the side walls of the connecting arms, and a plurality of anti-skid balls are fixedly connected to the side walls of the clamps. According to the utility model, the hydraulic cylinder at the top of the protective cover pulls the movable block to move upwards through the push rod, drives the rotating seat to ascend, promotes the rocker arm to rotate, further drives the connecting arm to move downwards, and drives the bottom clamp to move downwards and towards the center, so that the underground tool is clamped and fixed, and the problems of infirm clamping and low efficiency are solved; and the fishing success rate and the operation efficiency are improved.

Description

Technical Field

[0001] This utility model relates to the field of lead-in female cone technology, and in particular to a lead-in high-hardness female cone. Background Technology

[0002] With the increasing demand for deep well operations, downhole tool retrieval operations are becoming increasingly complex. While traditional retrieval tools can perform basic functions during operations, they have certain shortcomings in tool clamping and fixation, especially in terms of operational efficiency and success rate. Traditional equipment has failed to effectively solve the problems of weak gripping and unstable fixation. In order to improve the success rate of downhole operations, reduce equipment failures, and improve work efficiency, developing a more efficient and stable mechanical device has become an urgent problem to be solved. This utility model, through innovative design, solves the shortcomings of existing technologies and significantly improves operational efficiency and reliability.

[0003] In existing technologies, mechanical structures used for retrieving downhole tools often employ relatively simple gripping designs. Commonly, simple chucks are installed inside the main cone. When the main cone contacts the downhole tool, gravity or simple mechanical transmission causes the chucks to close, thereby gripping the tool. The technical principle is mainly based on the basic mechanical lever principle or a simple hydraulic drive principle to control the opening and closing of the chucks. In terms of connection methods, relatively cumbersome threaded connections or bolt fixings are often used to connect different components.

[0004] However, existing fishing equipment suffers from problems in practical applications, such as insecure gripping of downhole tools and low fishing efficiency. Due to the complex downhole environment and the varying shapes and positions of tools, traditional gripper structures struggle to accurately and securely grasp them, often resulting in tools falling off during the gripping process. This significantly reduces the success rate of fishing. Furthermore, the relatively cumbersome operation process, requiring a considerable amount of time from tool positioning to successful gripping, leads to overall low fishing efficiency. Each failed attempt means restarting the operation, wasting significant time and resources and impacting the progress of the entire mining project. These problems severely restrict the efficient implementation of downhole fishing operations. To address these issues, an introductory high-hardness mother cone is proposed. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides an introduced high-hardness female cone, which aims to improve the problems of weak grip and low efficiency in the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An inlet-type high-hardness mother cone includes a protective cover, and a clamping assembly is provided inside the protective cover for clamping and fixing downhole tools;

[0008] The clamping assembly includes a hydraulic cylinder. The top of the hydraulic cylinder is fixedly connected to the top of the inner wall of the protective cover. A push rod is fixedly connected to the output end of the hydraulic cylinder. A movable block is fixedly connected to the bottom of the push rod. Multiple rotating seats are fixedly connected to the outer walls of both the hydraulic cylinder and the movable block. The rotating seats are distributed in a circumferential shape. A rocker arm is rotatably connected to the inner wall of each rotating seat. A connecting arm is provided on the side wall of each rocker arm. One end of each rocker arm is rotatably connected to the inside of the connecting arm. A clamp is fixedly connected to the bottom of the side wall of each connecting arm. Multiple anti-slip balls are fixedly connected to the side wall of each clamp. The anti-slip balls are distributed in an array.

[0009] As a further description of the above technical solution:

[0010] The outer wall of the protective cover is provided with multiple flow guide grooves, which are distributed in a circular shape, and the outer wall of the protective cover is provided with multiple water holes, which are distributed in an array in a circular shape.

[0011] As a further description of the above technical solution:

[0012] The top of the protective cover is provided with a connecting seat, the bottom of the connecting seat is fixedly connected to the top of the protective cover, a sliding hollow column is slidably connected to the inner wall of the connecting seat, and a limit block is fixedly connected to the inner wall of the sliding hollow column.

[0013] As a further description of the above technical solution:

[0014] A fixed seat is fixedly connected to the bottom of the inner wall of the connecting seat, and a limiting spring is sleeved on the outer wall of the fixed seat. One end of the limiting spring is fixedly connected to the bottom of the inner wall of the connecting seat, and the other end of the limiting spring is fixedly connected to the bottom of the limiting block.

[0015] As a further description of the above technical solution:

[0016] The inner wall of the fixed seat is slidably connected with a plurality of ball bearings, which are distributed in a circumferential shape.

[0017] As a further description of the above technical solution:

[0018] The inner wall of the fixed base is provided with multiple guide grooves, which are distributed in a circular shape, and an extension rod is slidably connected to the inner wall of the fixed base;

[0019] As a further description of the above technical solution:

[0020] The extension rod has multiple protruding blocks fixedly connected to its outer wall. The protruding blocks are distributed in a circumferential shape, and their positions correspond to the positions of the guide grooves.

[0021] As a further description of the above technical solution:

[0022] A limiting groove is provided at the middle of the outer wall of the extension rod, and a connecting column is fixedly connected to the top of the extension rod.

[0023] This utility model has the following beneficial effects:

[0024] 1. In this utility model, the hydraulic cylinder at the top of the protective cover pulls the movable block upward through the push rod, which drives the rotating seat to rise, causing the rocker arm to rotate, and then drives the connecting arm to move downward. The connecting arm drives the bottom clamp to move downward and towards the center, thus completing the clamping and fixing of the downhole tool. This solves the problems of unstable clamping and low efficiency, and improves the success rate of salvage and the efficiency of operation.

[0025] 2. In this utility model, firstly, the rope or other device is connected to the connecting column. Pressing down the sliding hollow column causes the limiting block to move downward, loosening the ball bearings inside the fixed seat and compressing the limiting spring. Aligning the protrusion with the guide groove, the extension rod is inserted into the fixed seat. Once the extension rod is in place, the sliding hollow column is released, and the limiting spring rebounds, pushing the limiting block upward, causing the ball bearings to be squeezed into the limiting groove. This quickly completes the connection between the connecting column and the connecting seat, solving the previous problems of inconvenient and time-consuming connection, and improving the efficiency of salvage operation preparation. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of an introductory high-hardness mother cone proposed in this utility model;

[0027] Figure 2 This is a schematic diagram of a protective cover structure for an introductory high-hardness mother cone proposed in this utility model;

[0028] Figure 3 This is an exploded view of the connecting seat structure of the high-hardness female cone introduced in this utility model.

[0029] Legend:

[0030] 1. Connecting seat; 2. Protective cover; 3. Guide channel; 4. Water hole; 5. Connecting column; 6. Sliding hollow column; 7. Hydraulic cylinder; 8. Push rod; 9. Movable block; 10. Rotating seat; 11. Rocker arm; 12. Connecting arm; 13. Clamp; 14. Anti-slip ball; 15. Extension rod; 16. Limiting groove; 17. Protrusion; 18. Limiting block; 19. Fixed seat; 20. Ball bearing; 21. Limiting spring; 22. Guide groove. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Reference Figure 1 and Figure 2 The present invention provides an embodiment of an introductory high-hardness mother cone, comprising a protective cover 2. The protective cover 2 is made of high-strength, high-hardness chromium-molybdenum alloy steel, which has good wear resistance and compressive strength. It can provide reliable protection for the internal clamping components in the complex environment of the well, preventing them from being damaged by factors such as downhole rocks and water flow. At the same time, the protective cover 2 also guides the downhole tools to enter, ensuring that the tools can slide smoothly into the interior for subsequent clamping operations. The protective cover 2 is provided with a clamping component, which is used to clamp and fix the downhole tools.

[0033] The clamping assembly includes a hydraulic cylinder 7, which serves as the power source. Made of high-strength metal, the hydraulic cylinder 7 possesses excellent sealing and pressure resistance. The top of the hydraulic cylinder 7 is welded and fixedly connected to the top of the inner wall of the protective cover 2, ensuring its stable position during operation. A push rod 8 is fixedly connected to the output end of the hydraulic cylinder 7. The function of the hydraulic cylinder 7 is to generate a strong thrust or pull force through pressure changes in the internal hydraulic oil, driving the push rod 8 to move, thereby providing power for the entire clamping action. A movable block 9 is fixedly connected to the bottom of the push rod 8. Multiple rotating seats 10, made of metal, are fixedly connected to the outer walls of both the hydraulic cylinder 7 and the movable block 9. Its inner wall is equipped with smooth bearings for connection with rocker arms 11. The function of the rotating seat 10 is to provide a stable rotation fulcrum for the rocker arms 11, ensuring that the rocker arms 11 can rotate flexibly during movement, and at the same time converting the linear motion of the movable block 9 into the rotational motion of the rocker arms 11. The rotating seat 10 is circumferentially distributed, and rocker arms 11 are rotatably connected to the inner wall of the rotating seat 10. The function of the rocker arms 11 is to rotate under the drive of the rotating seat 10, and through their own rotation, convert the upward displacement of the movable block 9 into the downward displacement of the connecting arm 12, realizing the transmission of force and the change of motion direction. Connecting arms 12 are provided on the side walls of the rocker arms 11, connecting... The function of arm 12 is to move under the drive of rocker arm 11, converting the rotational motion of rocker arm 11 into the linear motion of clamp 13, thereby realizing the clamping operation of downhole tools. One end of each rocker arm 11 is rotatably connected to the inside of connecting arm 12. Clamps 13 are fixedly connected to the bottom of the side wall of connecting arm 12. Multiple anti-slip balls 14 are fixedly connected to the side wall of clamp 13. The anti-slip balls 14 are made of high-hardness, high-friction coefficient rubber or metal alloy. Their function is to increase the friction between the clamp 13 and the tool surface when clamping the downhole tool, preventing the tool from slipping during the clamping process, and improving the stability and reliability of the clamping. The anti-slip balls 14 are arranged in an array. The protective cover 2 has multiple guide channels 3 on its outer wall. These channels guide the flow of water or mud along a specific path during the lowering of the mother cone, reducing the resistance of the liquid to the mother cone and preventing the liquid from affecting the clamping components. This ensures that the mother cone can be lowered smoothly and approach the downhole tool. The guide channels 3 are arranged in a circular pattern. The protective cover 2 also has multiple water holes 4 on its outer wall. These holes further regulate the flow of the downhole liquid, allowing the liquid to be distributed more evenly around the protective cover 2. They also help balance the pressure inside and outside the protective cover 2, improving the stability of the mother cone in the downhole environment. The water holes 4 are arranged in an array in a circular pattern.

[0034] Specifically, after connecting the mother cone to the relevant lowering and connecting devices, the mother cone is placed into the corresponding pipe using specialized equipment. As the mother cone continues to be lowered and rotated, the protective cover 2 gradually approaches the outer wall of the downhole tool. The downhole tool will gradually slide into the interior of the protective cover 2 along its inner wall. When the downhole tool reaches the appropriate position, the hydraulic cylinder 7 at the top of the protective cover 2 starts to work, pulling the push rod 8 at the output end upward. The upward movement of the push rod 8 causes the movable block 9 fixedly connected at the bottom to also move upward. The displacement of the movable block 9 causes multiple rotating seats 10 on its side wall to also move upward. The upward movement of the rotating seats 10 causes the rocker arm 11 rotatably connected to it to rotate. The upward movement of 0 is equivalent to applying an upward force to one end of the rocker arm 11. The rocker arm 11 rotates with its connection point with the rotating seat 10 as the fulcrum. During the rotation, the end of the rocker arm 11 connected to the connecting arm 12 moves downward, thereby pulling the connecting arm 12 to move downward in the vertical direction. The displacement of the connecting arm 12 causes the rocker arm 11 on the side wall of the hydraulic cylinder 7 to rotate as well. Since there is a mechanical relationship between the connecting arm 12 and the rocker arm 11 on the side wall of the hydraulic cylinder 7, the downward displacement of the connecting arm 12 will generate a force on the rocker arm 11 on the side wall of the hydraulic cylinder 7, causing it to rotate with the corresponding rotating seat 10 as the fulcrum, thereby assisting the displacement of the connecting arm 12 and further enhancing the movement effect of the connecting arm 12. Simultaneously, the displacement of the connecting arm 12 also causes the clamp 13 at its bottom to move downward and towards the center. Due to the coordinated action of multiple connecting arms 12, the clamp 13 moves downward and towards the center. As the clamp 13 moves downward and towards the center, the anti-slip ball 14 on its side wall gradually contacts the surface of the downhole tool. When the clamp 13 is in full contact with the downhole tool, the anti-slip ball 14 generates a large friction force with the tool surface, and the clamp 13 tightly holds the downhole tool, thus completing the clamping and fixing of the downhole tool. This achieves rapid and firm clamping of the downhole tool, improving the efficiency and success rate of the salvage operation.

[0035] Reference Figure 3The protective cover 2 has a connecting seat 1 on its top. The connecting seat 1 serves as a component connecting external equipment to the female cone. It is made of high-strength metal material, possessing good mechanical strength and corrosion resistance, and can maintain a stable structure in harsh downhole environments. The bottom of the connecting seat 1 is fixedly connected to the top of the protective cover 2. A sliding hollow column 6 is slidably connected to the inner wall of the connecting seat 1. A limit block 18 is fixedly connected to the inner wall of the sliding hollow column 6. The function of the limit block 18 is to cooperate with the ball bearing 20 inside the fixed seat 19 to lock the extension rod 15. The unlocking function includes a fixed base 19 fixedly connected to the bottom of the inner wall of the connecting base 1, which is used to accommodate and fix multiple balls 20 and the lower end of the extension rod 15. A limiting spring 21 is sleeved on the outer wall of the fixed base 19. One end of the limiting spring 21 is fixedly connected to the bottom of the inner wall of the connecting base 1, and the other end is fixedly connected to the bottom of the limiting block 18. The function of the limiting spring 21 is to provide elastic force during the operation of sliding the hollow column 6 and the limiting block 18, so as to realize the automatic reset of the limiting block 18, thereby completing the locking of the extension rod 15. In operation, multiple ball bearings 20 are slidably connected to the inner wall of the fixing base 19. Their function is to fix and release the extension rod 15 under the action of the limiting block 18. The ball bearings 20 are distributed in a circumferential shape. Multiple guide grooves 22 are formed on the inner wall of the fixing base 19. The guide grooves 22 cooperate with the protrusions 17 on the outer wall of the extension rod 15 to provide precise guidance for the insertion of the extension rod 15, ensuring that the extension rod 15 can be accurately inserted into the fixing base 19 and maintain a stable posture during insertion. The guide grooves 22 are distributed in a circumferential shape. An extension rod 15 is slidably connected to the inner wall of the fixed base 19. Multiple protrusions 17 are fixedly connected to the outer wall of the extension rod 15. These protrusions 17 are circumferentially distributed and their positions correspond to the guide grooves 22. Their function is to guide the insertion direction of the extension rod 15 when it is inserted into the fixed base 19, and to restrict the circumferential rotation of the extension rod 15 after insertion, ensuring connection stability. A limiting groove 16 is formed in the middle of the outer wall of the extension rod 15, its shape and size matching the ball bearing 20. The limiting groove 16 locks the extension rod 15 axially when the ball bearing 20 is inserted, preventing accidental pull-out during operation. A connecting post 5 is fixedly connected to the top of the extension rod 15. The connecting post 5 is made of metal and its shape and structure are designed according to actual usage requirements. It is used to connect external ropes or other retrieval devices, enabling the connection between the main cone and external equipment for downhole tool retrieval operations.

[0036] Specifically, when using this high-hardness mother cone fishing tool, the operator first connects the rope or other fishing device to the connecting column 5. Then, the operator holds the upper part of the sliding hollow column 6 and applies a vertical downward force. Under this force, the sliding hollow column 6 moves downward along the smooth track on the inner wall of the connecting seat 1. The downward movement of the sliding hollow column 6 causes the limiting block 18, which is fixedly connected to it, to also move downward. At the same time, due to the downward movement of the limiting block 18, the limiting block 1... The side wall no longer exerts a squeezing effect on the ball bearings 20 inside the fixed seat 19. The ball bearings 20, which were originally squeezed and in a relatively fixed position by the limiting block 18, become loose due to the disappearance of pressure and can roll freely on the inner wall of the fixed seat 19. At the same time, the limiting spring 21 is affected by the downward displacement of the sliding hollow column 6 and the limiting block 18 and begins to be compressed. At this time, the operator aligns the protrusion 17 on the outer wall of the extension rod 15 with the guide groove 22. After alignment, the operator continues to apply downward force to move the extension rod 15 along the guide groove 22. The extension rod 15 is inserted downwards into the fixed base 19. As the extension rod 15 gradually extends into the fixed base 19, the limiting groove 16 in the middle of its outer wall also moves to the position of the ball 20. When the limiting groove 16 reaches the position of the ball 20, the operator releases the sliding hollow column 6. After releasing the sliding hollow column 6, the limiting spring 21, which had stored elastic potential energy due to previous compression, begins to return to its original state, generating an upward counterforce. The counterforce of the limiting spring 21 pushes the limiting block 18 upwards to its original position, and the side wall of the limiting block 18 again presses against the fixed base 19. The ball bearings 20 inside the fixed seat 19 exert a squeezing effect. Under the squeezing of the limiting block 18, the originally loose ball bearings 20 are squeezed into the limiting groove 16, thereby achieving axial locking of the extension rod 15. Since the top of the extension rod 15 is fixedly connected to the connecting column 5, and the extension rod 15 is reliably connected to the fixed seat 19 through the ball bearings 20, the connection between the connecting column 5 and the connecting seat 1 is completed, realizing the quick connection of the introduction type mother cone. This greatly improves the preparation efficiency of the mother cone in actual fishing operations and provides a strong guarantee for efficient fishing of downhole tools.

[0037] Working principle: When using this high-hardness mother cone fishing tool, the operator first connects the rope or other device to the connecting column 5, then manually presses down the sliding hollow column 6. The downward displacement of the sliding hollow column 6 causes the limiting block 18 to also move downward, simultaneously causing the side wall of the limiting block 18 to stop pressing the ball 20 inside the fixed seat 19, making the ball 20 loose. At the same time, the limiting spring 21 is compressed. Then, the protrusion 17 is aligned with the guide groove 22, and the extension rod 15 is inserted downward into the fixed seat 19. As the extension rod 15 moves into the fixed seat 19, the limiting groove 16 is positioned to the ball 20. At this point, the sliding hollow column 6 is released, and the limiting spring 21 returns to its original position, pushing the limiting block 18 upward to its original position, and compressing the ball 20 again, causing the ball 20 to be squeezed into the limiting groove 16. This completes the connection between the connecting column 5 and the fixed seat 19. The connection of the connecting seat 1 achieves the effect of quickly connecting the lead-in female cone. After the connection is completed, the female cone is placed into the corresponding pipe. As the female cone continues to be lowered and rotated, the protective cover 2 will gradually approach the outer wall of the downhole tool. The downhole tool slides into the protective cover 2. At this time, the hydraulic cylinder 7 located at the top of the protective cover 2 pulls the movable block 9 upward through the push rod 8. The displacement of the movable block 9 causes the multiple rotating seats 10 on its side wall to also move upward. The displacement of the rotating seats 10 causes the rocker arm 11 to rotate, and through the rocker arm 11, it drives the connecting arm 12 to move downward. The displacement of the connecting arm 12 causes the rocker arm 11 on the side wall of the hydraulic cylinder 7 to rotate as well, in order to assist the displacement of the connecting arm 12. At the same time, the displacement of the connecting arm 12 also drives the clamp 13 at its bottom to move downward and in the middle, thereby completing the clamping and fixing of the downhole tool, thus achieving the effect of quickly and firmly gripping the downhole tool.

[0038] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model 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 spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An inlet-type high-hardness female cone, comprising a protective cover (2), characterized in that: The protective cover (2) is provided with a clamping assembly inside, which is used to clamp and fix the downhole tool; The clamping assembly includes a hydraulic cylinder (7), the top of which is fixedly connected to the top of the inner wall of the protective cover (2). A push rod (8) is fixedly connected to the output end of the hydraulic cylinder (7). A movable block (9) is fixedly connected to the bottom of the push rod (8). Multiple rotating seats (10) are fixedly connected to the outer walls of the hydraulic cylinder (7) and the movable block (9). The rotating seats (10) are distributed in a circumferential shape. A rocker arm (11) is rotatably connected to the inner wall of each rotating seat (10). A connecting arm (12) is provided on the side wall of each rocker arm (11). One end of each rocker arm (11) is rotatably connected to the inside of the connecting arm (12). A clamp (13) is fixedly connected to the bottom of the side wall of each connecting arm (12). Multiple anti-slip balls (14) are fixedly connected to the side wall of each clamp (13). The anti-slip balls (14) are distributed in an array.

2. The high-hardness mother cone introduced according to claim 1, characterized in that: The outer wall of the protective cover (2) is provided with multiple guide grooves (3), which are distributed in a circular shape. The outer wall of the protective cover (2) is provided with multiple water holes (4), which are distributed in an array in a circular shape.

3. The high-hardness mother cone introduced according to claim 2, characterized in that: The protective cover (2) is provided with a connecting seat (1) at the top. The bottom of the connecting seat (1) is fixedly connected to the top of the protective cover (2). A sliding hollow column (6) is slidably connected to the inner wall of the connecting seat (1). A limit block (18) is fixedly connected to the inner wall of the sliding hollow column (6).

4. The high-hardness female cone introduced according to claim 3, characterized in that: A fixed seat (19) is fixedly connected to the bottom of the inner wall of the connecting seat (1). A limiting spring (21) is sleeved on the outer wall of the fixed seat (19). One end of the limiting spring (21) is fixedly connected to the bottom of the inner wall of the connecting seat (1), and the other end of the limiting spring (21) is fixedly connected to the bottom of the limiting block (18).

5. The high-hardness female cone introduced according to claim 4, characterized in that: The inner wall of the fixed seat (19) is slidably connected with a plurality of balls (20), which are distributed in a circumferential shape.

6. The high-hardness female cone introduced according to claim 5, characterized in that: The inner wall of the fixed base (19) is provided with a plurality of guide grooves (22), which are distributed in a circular shape, and an extension rod (15) is slidably connected to the inner wall of the fixed base (19).

7. The high-hardness female cone introduced according to claim 6, characterized in that: The extension rod (15) has multiple protrusions (17) fixedly connected to its outer wall. The protrusions (17) are distributed in a circular shape, and their positions correspond to the positions of the guide grooves (22).

8. The high-hardness female cone introduced according to claim 7, characterized in that: A limiting groove (16) is provided at the middle of the outer wall of the extension rod (15), and a connecting column (5) is fixedly connected to the top of the extension rod (15).

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