Drill tool limiting elastic caliper steel ball

Abstract

The utility model discloses a drill tool limit elastic clamp forceps steel ball, aims at solving the technical problem of downhole stable fixation of drill tool. In the prior art, the traditional fixed mode has obvious defects: manual locking operation is cumbersome, and response lag, and is easy to fail in deep well or complex formation, and the hydraulic drive device structure is complex, and needs to be matched with hydraulic system, and is easy to break down in the downhole harsh environment, and the maintenance cost is high. At the same time, the existing structure locking and unlocking switching reliability is insufficient, and is easy to appear " false lock " " card stagnation ", and causes the drill tool fracture or accidental slide, and the spacing piece friction is big, and the energy consumption is high, and the life is short. The utility model cooperates through drill pipe, fishing pipe, limit ball, adjusting part and reset part, utilizes the block and the sliding slot to limit both only can move up and down. Reset part cooperates with adjusting part limiting surface, and control limit ball protrude or embed in the card slot: when the block is in the top of sliding slot, limit ball protrude and realize fixed, when in the bottom, limit ball embed and remove fixed. Its structure is simple, and need not complex drive system, and adapts to the harsh environment, and improves the reliability and operating efficiency of locking and unlocking.

Description

Technical Field

[0001] This utility model relates to the field of geological exploration, and in particular to a drill bit limiting spring caliper steel ball. Background Technology

[0002] In existing technologies, in fields such as geological exploration, oil and gas drilling, and mineral extraction, drilling tools need to penetrate deep into underground rock formations to complete tasks such as sampling, drilling, and operations. The stable fixation of the drilling tools at the target rock formation is a core element in ensuring operational accuracy and safety. For example, during core sampling, the drill string must be precisely positioned at a predetermined depth and remain stable to avoid positional deviations caused by ground vibrations, fluid impacts, or its own gravity; otherwise, it could lead to sampling depth deviations, sample contamination, or damage to the drilling tools. In directional drilling, temporary fixation of the drilling tools is a prerequisite for operations such as trajectory correction and pressure testing.

[0003] Existing technologies for securing and releasing drilling tools present numerous challenges. On one hand, traditional securing methods often rely on manual mechanical locking (such as pins or clips) or hydraulic drives. Manual locking requires remote operation by personnel via surface equipment or the deployment of auxiliary tools, resulting in cumbersome procedures and delayed response times. Especially in deep wells or complex formations, delays in signal transmission or mechanical jamming can easily lead to securing failure. While hydraulic drives offer automated control, their complex structure requires integrated hydraulic piping and power systems. In high-temperature, high-pressure, and highly corrosive downhole environments, leaks and pipe blockages are common, leading to high maintenance costs.

[0004] On the other hand, the reliability of locking and unlocking switching in existing fixed structures is insufficient. The fitting accuracy between the limiting components (such as locking blocks and chucks) and the drill pipe in some devices is low, which can easily lead to "false locking" (appearing to be fixed but not actually locked) or "jamming" (unable to unlock smoothly) under vibration conditions. For example, when the drill string needs to switch from a fixed state to a retractable state, if the limiting components cannot retract in time, it will cause a sudden increase in the resistance to pulling the drill pipe, or even cause the drill string to break; while if the limiting components retract prematurely, it will cause the drill string to slip unexpectedly, endangering the safety of downhole equipment.

[0005] Traditional fixed structures often use block-shaped or claw-shaped limiting components. These structures have surface or line contact with the drill pipe or related components, generating significant friction during the pulling up or lowering of the drill string. This not only increases energy consumption during operation, requiring more power to drive the drill string, but also accelerates component wear due to friction, shortening its service life. Furthermore, the high friction can cause the drill string to jam during movement, affecting the smoothness and accuracy of operation, especially in operations requiring precise control of the drill string's position. Utility Model Content

[0006] This application provides a drill string limiting spring caliper ball, which solves the obvious defects of traditional fixing methods in the prior art: manual locking is cumbersome, has a slow response, and is prone to failure in deep wells or complex formations; the hydraulic drive device has a complex structure, requires a matching hydraulic system, is prone to failure in harsh downhole environments, and has high maintenance costs. At the same time, the existing structure has insufficient reliability in switching between locking and unlocking, easily resulting in "false locking" or "jamming," leading to drill string breakage or accidental slippage, and the limiting component has high friction, high energy consumption, and short lifespan. This utility model uses a combination of drill pipe, fishing pipe, limiting ball, adjusting component, and reset component, utilizing a caliper block and a sliding groove to restrict the movement of both only up and down. The reset component, in conjunction with the adjusting component's limiting surface, controls the limiting ball to protrude or embed in the caliper groove: when the caliper block is at the top of the sliding groove, the limiting ball protrudes to achieve fixation; when it is at the bottom, the limiting ball embeds to release fixation. Its structure is simple, requires no complex drive system, is adaptable to harsh environments, and improves the reliability and operational efficiency of locking and unlocking.

[0007] The technical solutions adopted in the embodiments of this application are as follows.

[0008] A drill bit positioning spring caliper ball includes a drill pipe, a retrieval tube disposed on the drill pipe, a positioning ball that limits the position of the drill pipe, an adjusting member that causes the positioning ball to protrude or retract, and a resetting member that resets the position of the positioning ball. A first through groove is formed inside the drill pipe. The adjusting member is disposed on the end face of the retrieval tube facing the drill pipe and is located within the first through groove. A locating groove is formed on the side wall of the first through groove, and several positioning balls are located within the locating groove and arranged in a circumferential array. The side wall of the first through groove is provided with... The device includes a locking block, and the adjusting member has a sliding groove. The locking block slides within the sliding groove, and several sets of locking blocks and sliding grooves are arranged in a circumferential array. The locking block and the sliding groove restrict the drill pipe and the retrieval pipe to move only up and down. The adjusting member has a limiting surface, and one end of the resetting member abuts against the locking block, while the other end abuts against the limiting surface. When the locking block is at the top of the sliding groove, the limiting ball protrudes from the groove. When the locking block is at the bottom of the sliding groove, the limiting ball is embedded in the groove.

[0009] As a further improvement to the above technical solution:

[0010] The adjusting member has a limiting groove, which corresponds to the limiting ball, and the adjusting member has two sets of the limiting grooves; when the limiting ball is located in the upper limiting groove, the limiting ball protrudes; when the limiting ball is located in the lower limiting groove, the limiting ball is embedded.

[0011] When the drill pipe needs to be fixed, the adjusting member causes the limiting ball to protrude, thereby restricting the position of the drill pipe; when the drill pipe needs to be retrieved after sampling is completed, the retrieval pipe is pulled to raise the adjusting member relative to the drill pipe, thereby compressing the reset member and causing the limiting ball to move to the lower limiting groove, at which point the limiting ball loses its limiting ability.

[0012] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0013] 1. By employing a circumferential array of limiting balls (steel balls) as the limiting core, the contact method changes from surface or line contact to point contact compared to traditional block or claw-shaped limiting components, significantly reducing friction during drill string movement. This design reduces component wear, extends service life, and avoids jamming caused by excessive friction, making the drill string smoother during fixing and unlocking, especially suitable for operational scenarios requiring precise position control. Through the linkage mechanism of the adjusting and resetting components, pulling the retrieval pipe drives the limiting balls to quickly switch between "protruding lock" and "embedded unlock" states, eliminating the need for manual pins or complex hydraulic systems. When fixed, the limiting balls automatically pop out and lock; during retrieval, only a pulling action triggers unlocking, with a response speed far faster than traditional manual operation, effectively reducing operational lag issues in deep well operations. The limiting ball, through the cooperation of upper and lower limiting grooves and the locking groove, combined with the stabilizing elasticity of the reset component, ensures that the limiting ball accurately protrudes and remains locked when locked, avoiding "false locking"; when unlocking, the limiting ball is fully embedded in the locking groove, eliminating the risk of "jamming". The circumferential array design of the locking block and the sliding groove restricts the relative rotation of the drill pipe and the fishing pipe, retaining only the axial movement degree of freedom, further improving structural stability. All core components (limiting ball, adjusting component, reset component, etc.) are integrated inside the drill pipe, eliminating the need for an additional external locking mechanism, significantly reducing the radial dimension, and making it suitable for operations in confined downhole spaces. Its purely mechanical linkage structure does not rely on hydraulic pipelines or electronic components, and can withstand harsh environments with high temperature, high pressure, and high corrosion, reducing the probability of failure. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the drill bit limiting spring caliper steel ball in this utility model.

[0015] Figure 2 This is a cross-sectional view of the drill bit limiting spring caliper steel ball in this utility model.

[0016] In the diagram: 1. Drill pipe; 11. First through groove; 12. Slot; 13. Locking block; 2. Retrieval pipe; 3. Limiting ball; 4. Adjusting component; 41. Slide groove; 42. Limiting surface; 43. Limiting groove; 5. Reset component Detailed Implementation

[0017] This application provides a drill string limiting spring caliper ball, which solves the obvious defects of traditional fixing methods in the prior art: manual locking is cumbersome, has a slow response, and is prone to failure in deep wells or complex formations; the hydraulic drive device has a complex structure, requires a matching hydraulic system, is prone to failure in harsh downhole environments, and has high maintenance costs. At the same time, the existing structure has insufficient reliability in switching between locking and unlocking, easily resulting in "false locking" or "jamming," leading to drill string breakage or accidental slippage, and the limiting component has high friction, high energy consumption, and short lifespan. This utility model uses a combination of drill pipe, fishing pipe, limiting ball, adjusting component, and reset component, utilizing a caliper block and a sliding groove to restrict the movement of both only up and down. The reset component, in conjunction with the adjusting component's limiting surface, controls the limiting ball to protrude or embed in the caliper groove: when the caliper block is at the top of the sliding groove, the limiting ball protrudes to achieve fixation; when it is at the bottom, the limiting ball embeds to release fixation. Its structure is simple, requires no complex drive system, is adaptable to harsh environments, and improves the reliability and operational efficiency of locking and unlocking.

[0018] The technical solution in this application embodiment is to solve the above problems, and the overall idea is as follows:

[0019] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0020] A drill bit positioning spring caliper ball includes a drill pipe 1, a retrieval tube 2 disposed on the drill pipe 1, a positioning ball 3 for limiting the position of the drill pipe 1, an adjusting member 4 for protruding or retracting the positioning ball 3, and a resetting member 5 for resetting the position of the positioning ball 3; a first through groove 11 is formed inside the drill pipe 1; the adjusting member 4 is disposed on the end face of the retrieval tube 2 facing the drill pipe 1 and is located within the first through groove 11; a cladding groove 12 is formed on the side wall of the first through groove 11, and the positioning balls 3 are located within the cladding groove 12, and a plurality of them are arranged in a circumferential array; the side wall of the first through groove 11 is provided with There is a locking block 13, and the adjusting member 4 has a sliding groove 41. The locking block 13 slides in the sliding groove 41, and several sets of locking blocks 13 and sliding groove 41 are arranged in a circumferential array. The locking block 13 and sliding groove 41 restrict the drill pipe 1 and the fishing pipe 2 to move only up and down. The adjusting member 4 has a limiting surface 42. One end of the resetting member 5 abuts against the locking block 13, and the other end abuts against the limiting surface 42. When the locking block 13 is at the top of the sliding groove 41, the limiting ball 3 protrudes out of the locking groove 12. When the locking block 13 is at the bottom of the sliding groove 41, the limiting ball 3 is embedded in the locking groove 12.

[0021] The adjusting member 4 has a limiting groove 43, which corresponds to the limiting ball 3, and the adjusting member 4 has two sets of limiting grooves 43; when the limiting ball 3 is located in the upper limiting groove 43, the limiting ball 3 protrudes; when the limiting ball 3 is located in the lower limiting groove 43, the limiting ball 3 is embedded.

[0022] When the drill pipe 1 needs to be fixed, the adjusting component 4 causes the limiting ball 3 to protrude, thereby restricting the position of the drill pipe 1; when the sampling is completed and the drill pipe 1 needs to be retrieved, the retrieval pipe 2 is pulled to make the adjusting component 4 rise relative to the drill pipe 1, thereby compressing the reset component 5 and causing the limiting ball 3 to move to the lower limiting groove 43. At this time, the limiting ball 3 loses its limiting ability.

[0023] By employing a circular array of limiting balls 3 (steel balls) as the limiting core, the contact method changes from surface or line contact to point contact compared to traditional block or claw-shaped limiting components, significantly reducing friction during drill string movement. This design reduces component wear, extends service life, and avoids jamming caused by excessive friction, making the drill string smoother during fixing and unlocking, especially suitable for operational scenarios requiring precise position control. Through the linkage mechanism of the adjusting component 4 and the resetting component 5, pulling the retrieval pipe 2 drives the limiting balls 3 to quickly switch between the "protruding lock" and "embedded unlock" states, eliminating the need for manual pins or complex hydraulic systems. When fixed, the limiting balls 3 automatically pop out and lock; during retrieval, only a pulling action is needed to trigger unlocking, with a response speed far faster than traditional manual operation, effectively reducing operational lag issues in deep well operations. The limiting ball 3 engages with the slot 12 via two sets of limiting grooves 43, combined with the stabilizing elasticity of the reset component 5, ensuring that the limiting ball 3 precisely protrudes and remains locked when locked, avoiding "false locking"; when unlocking, the limiting ball 3 is fully embedded in the slot 12, eliminating the risk of "jamming". The circumferential array design of the locking block 13 and the sliding groove 41 restricts the relative rotation between the drill pipe 1 and the fishing pipe 2, retaining only the axial movement degree of freedom, further improving structural stability. All core components (limiting ball 3, adjusting component 4, reset component 5, etc.) are integrated inside the drill pipe 1, eliminating the need for an additional external locking mechanism, significantly reducing the radial dimension, and making it suitable for operations in confined downhole spaces. Its purely mechanical linkage structure does not rely on hydraulic pipelines or electronic components, and can withstand harsh environments with high temperature, high pressure, and high corrosion, reducing the probability of failure.

[0024] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0025] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A drill bit limiting spring caliper steel ball, characterized in that: The system includes a drill pipe (1), a retrieval pipe (2) mounted on the drill pipe (1), a limiting ball (3) that restricts the position of the drill pipe (1), an adjusting member (4) that causes the limiting ball (3) to protrude or retract, and a resetting member (5) that resets the position of the limiting ball (3). A first through groove (11) is provided inside the drill pipe (1). The adjusting member (4) is located on the end face of the retrieval pipe (2) facing the drill pipe (1) and is located inside the first through groove (11). A slot (12) is provided on the side wall of the first through groove (11), and the limiting ball (3) is located in the slot (12) and is arranged in a circumferential array. A locking block (13) is provided on the side wall of the first through groove (11), and the adjusting member (4) is provided with a locking block (13). A sliding groove (41) is provided, and the locking block (13) slides within the sliding groove (41). Several sets of the locking block (13) and the sliding groove (41) are arranged in a circumferential array. The locking block (13) and the sliding groove (41) restrict the drill pipe (1) and the retrieval pipe (2) to move only up and down. A limiting surface (42) is provided on the adjusting member (4). One end of the resetting member (5) abuts against the locking block (13), and the other end abuts against the limiting surface (42). When the locking block (13) is located at the top of the sliding groove (41), the limiting ball (3) protrudes from the groove (12). When the locking block (13) is located at the bottom of the sliding groove (41), the limiting ball (3) is embedded in the groove (12).

2. The drill bit limiting spring caliper steel ball according to claim 1, characterized in that: The adjusting member (4) has a limiting groove (43) which corresponds to the limiting ball (3), and the adjusting member (4) has two sets of the limiting grooves (43); when the limiting ball (3) is located in the upper limiting groove (43), the limiting ball (3) protrudes; when the limiting ball (3) is located in the lower limiting groove (43), the limiting ball (3) is embedded.

3. The drill bit limiting spring caliper steel ball according to claim 2, characterized in that: When the drill pipe (1) needs to be fixed, the adjusting member (4) drives the limiting ball (3) to protrude, thereby limiting the position of the drill pipe (1); when the sampling is completed and the drill pipe (1) needs to be retrieved, the retrieval pipe (2) is pulled to make the adjusting member (4) rise relative to the drill pipe (1), thereby compressing the reset member (5) and causing the limiting ball (3) to move to the lower limiting groove (43). At this time, the limiting ball (3) loses its limiting ability.

Images