A sleeve

Abstract

This invention discloses a casing, relating to the field of oil production equipment technology. The casing body has connecting pipe sections at both ends. One end of a female coupling is threaded to one connecting pipe section, and the other end is threaded to another connecting pipe section. The casing body has two first key blocks, and the female coupling has two second key blocks at each end. A reset element is provided between the first key blocks and the casing body. Under the pressure of the reset element, the first one-way tooth engages with the groove of the second one-way tooth, restricting the casing body from rotating relative to the female coupling in the first direction. It also drives the first key block to overcome the pressure of the reset element and move away from the second key block along the length of the casing body, causing the first and second one-way teeth to disengage. Therefore, this device can avoid the risk of reverse disengagement and stably transmit the bidirectional torque required for torsional drilling, enabling the casing body drilling to safely adapt to the torsional process, improving operational safety and drilling efficiency.

Description

Technical Field

[0001] This invention relates to the field of oil production equipment technology, and in particular to a casing. Background Technology

[0002] In oil drilling operations, the torsion pendulum drilling process converts static friction into dynamic friction by driving the drill pipe to rotate in both directions via a top drive, significantly improving drilling efficiency and becoming a common technique for drilling in complex formations. However, when this process is applied to casing drilling, the casing threaded joints are far less resistant to vibration and loosening than conventional drill pipe joints. Under conditions of sudden release of drill string reverse torque, the casing is highly susceptible to reverse rotation and loosening, potentially leading to serious downhole accidents such as drill string falling into the well. This severely limits the widespread application of the torsion pendulum process in casing drilling.

[0003] Although existing technologies have developed casing body structures that use anti-torque release joints, which release anti-torque through the relative rotation of internal and external threaded joints to reduce the risk of loosening, such structures cannot effectively transmit working torque while releasing torque. They can only passively unload and cannot actively stop rotation, and there is still a risk of reverse disengagement. They cannot meet the requirements of alternating transmission of forward and reverse torque during the torsional drilling process of the casing body and absolutely prohibiting reverse loosening. Summary of the Invention

[0004] The purpose of this invention is to provide a casing that solves the problems existing in the prior art, avoids the risk of reverse disengagement, and can stably transmit the bidirectional torque required for torsional drilling, so that the casing body can be safely adapted to the torsional process, thereby improving operational safety and drilling efficiency.

[0005] To achieve the above objectives, the present invention provides the following solution: This invention provides a casing, including a casing body and a female coupling. Both ends of the casing body have connecting pipe sections. One end of the female coupling is threaded to one of the connecting pipe sections, and the other end is threaded to a connecting pipe section of another casing. The casing body has two first key blocks located between and close to the two connecting pipe sections. Two second key blocks are respectively provided at both ends of the female coupling. The first key blocks are connected to the casing body via a first fixing member, which provides circumferential and radial positioning and fixation of the first key blocks relative to the casing body along its length. A space is provided between the first key blocks and the casing body. A reset component is provided. The first key block has a first one-way tooth at one end facing the female coupling, and the second key block has a second one-way tooth at one end facing the first key block. Under the pressure of the reset component, the first one-way tooth engages with the groove of the second one-way tooth to restrict the sleeve body from rotating relative to the female coupling in a first direction. When the sleeve body rotates relative to the female coupling in a second direction opposite to the first direction, the first one-way tooth, under the pressure of the tooth surface of the second one-way tooth, can drive the first key block to overcome the pressure of the reset component and move away from the second key block along the length direction of the sleeve body, so that the first one-way tooth disengages from the second one-way tooth, and the sleeve body can rotate relative to the female coupling in the second direction.

[0006] In some embodiments, the first one-way tooth is a ratchet tooth, and the second direction is the sleeve tightening direction.

[0007] In some embodiments, two male couplings are fixedly fitted on the outside of the sleeve body. The two male couplings are located between the two connecting pipe segments and close to the two connecting pipe segments respectively. A first fixing groove is opened at the end of the male coupling near the corresponding connecting pipe segment. The first fixing groove is used to accommodate the first key block. The size of the first fixing groove is larger than the size of the first key block.

[0008] In some embodiments, a first groove is provided on both sides of the first key block. One end of the first fixing member passes through the first fixing groove and is fixedly connected to the sleeve body. The other end of the first fixing member is placed outside the first key block to fix the first key block and the sleeve body in a circumferential and radial direction. Along the length direction of the sleeve body, the size of the first groove is larger than the size of the first fixing member so that the first key block can move relative to the sleeve body in the length direction of the sleeve body, so as to realize the engagement or disengagement of the first one-way tooth with the second one-way tooth.

[0009] In some embodiments, a second fixing member is also included. A second groove is provided on one side of the second key block. One end of the second fixing member passes through the second groove and is fixedly connected to the female coupling. The other end of the second fixing member is placed outside the second key block to limit and fix the second key block and the female coupling in a circumferential and radial direction. Along the length direction of the female coupling, the size of the second groove is equal to the size of the second fixing member so that the second key block is fixed on the female coupling.

[0010] In some embodiments, a fixing hole is provided on the first key block, one end of the reset member is disposed in the fixing hole, and the other end is in contact with the bottom of the first fixing groove.

[0011] In some embodiments, the first fastener includes a first screw and a first pressure cap. The first pressure cap is fixed to one end of the first screw, and the other end of the first screw is threadedly connected to the sleeve body. The outer diameter of the first pressure cap is smaller than the inner diameter of the first groove, and the bottom surface of the first pressure cap contacts the bottom of the first groove.

[0012] In some embodiments, the second fastener includes a second screw and a second pressure cap, the second pressure cap being fixed to one end of the second screw, the other end of the second screw being threadedly connected to the female coupling, and the outer diameter of the second pressure cap being equal to the inner diameter of the second groove.

[0013] In some embodiments, the reset element is a compression spring, with one end of the compression spring abutting against the inside of the fixing hole and the other end abutting against the inner wall of the first fixing groove.

[0014] In some embodiments, a second fixing groove is provided at each end of the female coupling, and the second fixing groove is used to fix the second key block. The present invention achieves the following technical effects compared to the prior art: This invention provides a sleeve, which achieves a one-way locking rotation function between the sleeve body and the female coupling by correspondingly setting a first key block and a second key block with a one-way tooth structure on the sleeve body and the female coupling, in conjunction with the circumferential and radial limiting of the first key block by the first fixing member and the elastic reset function of the axially movable assembly structure and the reset member. Under the pushing action of the reset member, the first one-way tooth and the second one-way tooth can be stably engaged, effectively limiting the reverse rotation of the sleeve body 1 relative to the female coupling 4, ensuring the assembly tightness and overall stability of the sleeve after connection, and preventing loosening and disconnection during use. At the same time, when tightening the sleeve in the forward rotation, the inclined surface of the one-way tooth can be used to drive the first key block 31 to slide axially and break away from the tooth engagement constraint, so as to realize the sleeve can rotate freely in the forward direction and tighten the sleeve. The overall structure is simple and compact, and easy to disassemble and assemble. At the same time, the limiting assembly structure ensures the running stability of the key block, effectively improving the assembly accuracy and connection reliability of the sleeve. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the sleeve structure in one embodiment of the present invention; Figure 2 As one embodiment of the present invention Figure 1 Cross-sectional view along section AA; Figure 3 This is a schematic diagram of the mating structure of the first key block and the second key block in one embodiment of the present invention; Figure 4 This is a schematic diagram of the first pressure cap structure in one embodiment of the present invention; Figure 5 As one embodiment of the present invention Figure 4 A sectional view along section BB; Figure 6 This is a schematic diagram of the female coupling structure in one embodiment of the present invention; Figure 7 As one embodiment of the present invention Figure 6 Cross-sectional view along section AA; Figure 8 This is a top view of the female coupling in one embodiment of the present invention; Figure 9 This is a schematic diagram of the male coupling structure in one embodiment of the present invention; Figure 10 As one embodiment of the present invention Figure 9Cross-sectional view along section AA; Figure 11 As one embodiment of the present invention Figure 9 A sectional view along section BB.

[0017] Wherein: 1-Sleeve body; 2-Male coupling; 3-Key block; 4-Female coupling; 31-First key block; 32-Second key block; 33-First screw; 34-First pressure cap; 35-Reset component. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] This invention provides a sleeve, such as Figure 1-11As shown, the casing includes a casing body 1 and a female coupling 4. Both ends of the casing body 1 have connecting pipe sections. One end of the female coupling 4 is threaded to one connecting pipe section, and the other end is threaded to one connecting pipe section of another casing. Two first key blocks 31 are provided on the casing body 1, located between and close to the two connecting pipe sections. Two second key blocks 32 are provided at each end of the female coupling 4. The first key blocks 31 are connected to the casing body 1 via a first fixing member, which is used to circumferentially and radially limit and fix the first key blocks 31 to the casing body 1, and to ensure the first key blocks... Block 31 can move relative to the sleeve body 1 along the length direction of the sleeve body 1, the length direction of the sleeve body 1 being parallel to the axial direction of the sleeve body 1. A reset member 35 is provided between the first key block 31 and the sleeve body 1. The end of the first key block 31 facing the female coupling 4 is provided with a first one-way tooth, and the end of the second key block 32 facing the first key block 31 is provided with a second one-way tooth. Under the pressure of the reset member 35, the first one-way tooth engages with the groove of the second one-way tooth to restrict the sleeve body 1 from rotating relative to the female coupling 4 in a first direction. When the sleeve body 1 rotates relative to the female coupling 4 in a second direction opposite to the first direction, Under the pressure of the tooth surface of the first one-way tooth, the first key block 31 can overcome the pressure of the reset member 35 and move along the length direction of the sleeve body 1 away from the second key block 32, so that the first one-way tooth and the second one-way tooth disengage, and the sleeve body 1 can rotate relative to the female coupling 4 in the second direction. In this embodiment, by correspondingly setting the first key block 31 and the second key block 32 with one-way tooth structure on the sleeve body 1 and the female coupling 4, and cooperating with the first fixing member to limit the circumferential and radial movement of the first key block 31 and the axial movable assembly structure and the elastic reset effect of the reset member 35, the sleeve body 1 and the female coupling 4 are realized. The one-way locking rotation function of the clamp 4 can stably mesh the first one-way tooth and the second one-way tooth under the pushing action of the reset piece 35, effectively restricting the reverse rotation of the sleeve body 1 relative to the female clamp 4, ensuring the assembly tightness and overall stability of the sleeve connection, and preventing loosening and disconnection during use. At the same time, when tightening the upper buckle in the forward rotation, the first key block 31 can be driven to slide axially and break away from the tooth engagement constraint by the pressure of the inclined surface of the one-way tooth, so as to realize the sleeve can rotate freely in the forward direction to tighten the upper buckle. The overall structure is simple and compact, and easy to disassemble and assemble. At the same time, the limit assembly structure ensures the running stability of the key block, effectively improving the assembly accuracy and connection reliability of the sleeve docking.

[0021] In some embodiments of this example, the first one-way tooth is a ratchet tooth, and the second direction is the sleeve tightening direction. By setting the first one-way tooth as a ratchet tooth and setting the second direction as the sleeve tightening direction, the structural characteristics of the ratchet tooth's one-way meshing and one-way sliding can be utilized to allow the first one-way tooth to smoothly pass over the second one-way tooth to achieve free tightening assembly when the sleeve is tightened. After tightening, the ratchet teeth engage and lock each other, effectively preventing the sleeve from loosening in the opposite direction. This ensures that the sleeve can be smoothly tightened and connected, and also greatly improves the reliability of the anti-loosening after connection. The structure is simple and the one-way locking effect is stable.

[0022] In some embodiments of this example, two male couplings 2 are fixedly fitted on the outside of the sleeve body 1. The two male couplings 2 are located between two connecting pipe sections and close to the two connecting pipe sections respectively. The end of the male coupling 2 near the corresponding connecting pipe section has a first fixing groove. The first fixing groove is used to accommodate the first key block 31. The size of the first fixing groove is larger than the size of the first key block 31. By fixing the male coupling 2 on the outside of the sleeve body 1 and opening the first fixing groove with a size larger than the first key block 31, a regular installation and movement space can be provided for the first key block 31. This can not only provide circumferential protection and limit the first key block 31 to avoid collision damage during operation, but also ensure that the first key block 31 slides smoothly along the length direction of the sleeve body 1 without affecting the normal operation of one-way gear engagement and disengagement. At the same time, the structure of the first key block 31 is integrated into the area of ​​the male coupling 2, which improves the overall structural compactness, optimizes the stress distribution, and enhances the structural stability and service life of the sleeve connection part.

[0023] In some embodiments of this example, the first key block 31 has first grooves on both sides. One end of the first fixing member passes through the first fixing groove and is fixedly connected to the sleeve body 1. The other end of the first fixing member is placed outside the first key block 31 to fix the first key block 31 and the sleeve body 1 circumferentially and radially. Along the length of the sleeve body 1, the size of the first groove is larger than the size of the first fixing member, so that the first key block 31 can move relative to the sleeve body 1 in the length of the sleeve body 1, realizing the engagement or disengagement of the first one-way tooth and the second one-way tooth. By opening the first grooves on both sides of the first key block 31, the first fixing member is used to fix the first key block 31. The first key block 31 is circumferentially and radially limited to the sleeve body 1 by passing through the first groove. At the same time, the size of the first groove along the length of the sleeve is set to be larger than that of the first fixing member, which precisely limits the first key block 31 to move only axially. This effectively prevents the first key block 31 from circumferentially deflecting or radially disengaging, ensuring the one-way tooth meshing alignment accuracy. It also allows for axial sliding margin, enabling the first key block 31 to smoothly complete axial displacement and realize the meshing and disengagement of the first one-way tooth and the second one-way tooth. This ensures the stable and reliable one-way locking and reverse loosening function of the sleeve. The structure is simple and the limiting is precise, improving the overall motion reliability and connection stability.

[0024] In some embodiments of this example, the sleeve further includes a second fixing member. A second groove is provided on one side of the second key block 32. One end of the second fixing member passes through the second groove and is fixedly connected to the female coupling 4. The other end of the second fixing member is placed outside the second key block 32 to limit and fix the second key block 32 and the female coupling 4 in a circumferential and radial direction. Along the length direction of the female coupling 4, the size of the second groove is equal to the size of the second fixing member, so that the second key block 32 is fixed on the female coupling 4. By using the second fixing member to pass through the second groove of the second key block 32 and connect to the female coupling 4, the circumferential and radial limiting and fixing of the second key block 32 is achieved. At the same time, the size of the second groove along the length direction is consistent with the size of the second fixing member, so that the second key block 32 is fixed in position on the female coupling 4 and cannot move axially. This can ensure the accurate and stable position of the second one-way tooth, avoid its displacement or movement, and thus form a stable and reliable one-way meshing fit with the axially movable first key block 31. This improves the alignment accuracy and overall operational stability of the sleeve one-way locking structure, prevents the second key block 32 from loosening and failing, and ensures the long-lasting and effective anti-loosening effect of the sleeve connection.

[0025] In some embodiments of this example, a fixing hole is provided on the top of the first key block 31, and one end of the reset member 35 is disposed in the fixing hole, while the other end contacts the bottom of the first fixing groove. By placing one end of the reset member 35 in the fixing hole of the first key block 31 and the other end abutting against the bottom of the first fixing groove, the reset member 35 can be precisely positioned and constrained, preventing the reset member 35 from shifting, falling off, or getting stuck. This ensures that the reset member 35 stably outputs axial elastic force, enabling the first key block 31 to reliably achieve axial reset and ensuring precise meshing and locking of the first one-way tooth and the second one-way tooth. At the same time, this installation method has a compact structure, does not occupy extra space, improves the overall structural stability, and ensures the continuous effectiveness of the sleeve's one-way anti-loosening function.

[0026] In some embodiments of this example, the first fixing member includes a first screw 33 and a first pressure cap 34. The first pressure cap 34 is fixed to one end of the first screw 33, and the other end of the first screw 33 is threadedly connected to the sleeve body 1. The outer diameter of the first pressure cap 34 is smaller than the inner diameter of the first groove, and the bottom surface of the first pressure cap 34 contacts the bottom of the first groove. The first fixing member adopts a combination structure of the first screw 33 and the first pressure cap 34. The first screw 33 is threadedly connected to the sleeve body 1 to achieve reliable fixing. The outer diameter of the first pressure cap 34 is smaller than the inner diameter of the first groove, which can not only limit the first key block 31 circumferentially and radially to prevent it from deflecting or dislodging, but also will not interfere with the axial sliding of the first key block 31 along the length direction of the sleeve body 1, ensuring smooth movement of the first key block 31 and accurately realizing the engagement and disengagement of the one-way teeth. This structure is convenient to disassemble and assemble, simple to assemble, and has a stable limiting effect, which can effectively improve the operational reliability and maintenance convenience of the sleeve one-way locking structure.

[0027] In some embodiments of this example, the second fixing member includes a second screw and a second pressure cap. The second pressure cap is fixed to one end of the second screw, and the other end of the second screw is threadedly connected to the female coupling 4. The outer diameter of the second pressure cap is equal to the inner diameter of the second groove. The second fixing member adopts a combination structure of the second screw and the second pressure cap. The second screw is threadedly connected to the female coupling 4 to achieve a firm assembly. The outer diameter of the second pressure cap is equal to the inner diameter of the second groove, which can limit the second key block 32 in all directions in the circumferential, radial and axial directions, so that the second key block 32 is completely fixed on the female coupling 4 without displacement or movement, ensuring that the position of the second one-way tooth is accurate and stable, and accurately aligning and meshing with the axially movable first key block 31, improving the reliability of the one-way locking structure. At the same time, this structure is easy to disassemble and assemble, and is firmly fixed, effectively preventing the second key block 32 from loosening and shifting, and ensuring that the anti-loosening locking effect of the sleeve is stable and durable.

[0028] In some embodiments of this example, the reset element 35 is a compression spring, with one end abutting against the fixing hole and the other end abutting against the inner wall of the first fixing groove. The reset element 35 is a compression spring, which has a simple structure and stable and reliable elastic force. It can stably provide axial reset thrust for the first key block 31, so that the first one-way tooth always remains engaged and locked with the second one-way tooth. At the same time, the axial deformation of the compression spring is smooth, and it can be stably compressed when the sleeve is loosened in the reverse direction, allowing the first key block 31 to slide axially to disengage the teeth, ensuring that the sleeve can rotate smoothly in the reverse direction. The overall structure is durable and suitable for frequent tightening and loosening of the sleeve, effectively improving the stability and service life of the one-way anti-loosening structure.

[0029] In some embodiments of this example, the female coupling 4 has second fixing grooves at both ends for fixing the second key block 32. The second fixing grooves at both ends of the female coupling 4 provide a regular installation and positioning space for the second key block 32, enabling precise embedding and fixing of the second key block 32, effectively preventing circumferential displacement and radial wobbling of the second key block 32. At the same time, it keeps the position of the second one-way tooth stable and ensures precise alignment and meshing with the first one-way tooth on the first key block 31, improving the fitting accuracy of the one-way locking structure, enhancing the anti-loosening reliability after sleeve connection, and making the overall structure compact and easy to assemble and process.

[0030] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A sleeve, characterized by: The casing includes a casing body and a female coupling. Both ends of the casing body have connecting pipe sections. One end of the female coupling is threaded to one of the connecting pipe sections, and the other end of the female coupling is threaded to one of the connecting pipe sections of another casing. The casing body is provided with two first key blocks, which are located between the two connecting pipe sections and close to the two connecting pipe sections respectively. Both ends of the female coupling are provided with two second key blocks respectively. The first key block is connected to the sleeve body via a first fixing member. The first fixing member is used to circumferentially and radially limit and fix the first key block and the sleeve body, and to allow the first key block to move relative to the sleeve body in the length direction of the sleeve body. A reset member is provided between the first key block and the sleeve body. The end of the first key block facing the female coupling is provided with a first one-way tooth, and the end of the second key block facing the first key block is provided with a second one-way tooth. Under the pressure of the reset member, the first one-way tooth engages with the groove of the second one-way tooth to restrict the sleeve body from rotating relative to the female coupling in a first direction. When the sleeve body rotates relative to the female coupling in a second direction opposite to the first direction, the first one-way tooth, under the pressure of the tooth surface of the second one-way tooth, can drive the first key block to overcome the pressure of the reset member and move away from the second key block along the length direction of the sleeve body, so that the first one-way tooth and the second one-way tooth disengage, and the sleeve body can rotate relative to the female coupling in the second direction.

2. The sleeve of claim 1, wherein: The first one-way tooth is a ratchet tooth, and the second direction is the tightening direction of the sleeve.

3. The sleeve according to claim 1, characterized in that: Two male couplings are fixedly sleeved on the outside of the sleeve body. The two male couplings are located between the two connecting pipe sections and close to the two connecting pipe sections respectively. A first fixing groove is opened at the end of the male coupling close to the corresponding connecting pipe section. The first fixing groove is used to accommodate the first key block. The size of the first fixing groove is larger than the size of the first key block.

4. The sleeve according to claim 3, characterized in that: The first key block has a first groove on both sides. One end of the first fixing member passes through the first fixing groove and is fixedly connected to the sleeve body. The other end of the first fixing member is placed outside the first key block and is used to fix the first key block and the sleeve body in a circumferential and radial direction. Along the length direction of the sleeve body, the size of the first groove is larger than the size of the first fixing member, so that the first key block can move relative to the sleeve body in the length direction of the sleeve body, so as to realize the engagement or disengagement of the first one-way tooth with the second one-way tooth.

5. The sleeve according to claim 3, characterized in that: It also includes a second fixing member. A second groove is provided on one side of the second key block. One end of the second fixing member passes through the second groove and is fixedly connected to the female coupling. The other end of the second fixing member is placed outside the second key block to limit and fix the second key block and the female coupling in a circumferential and radial direction. Along the length direction of the female coupling, the size of the second groove is equal to the size of the second fixing member so that the second key block is fixed on the female coupling.

6. The sleeve according to claim 3, characterized in that: The first key block has a fixing hole, one end of the reset member is disposed in the fixing hole, and the other end is in contact with the bottom of the first fixing groove.

7. The sleeve according to claim 4, characterized in that: The first fixing member includes a first screw and a first pressure cap. The first pressure cap is fixed to one end of the first screw, and the other end of the first screw is threadedly connected to the sleeve body. The outer diameter of the first pressure cap is smaller than the inner diameter of the first groove, and the bottom surface of the first pressure cap contacts the bottom of the first groove.

8. The sleeve according to claim 5, characterized in that: The second fastener includes a second screw and a second pressure cap. The second pressure cap is fixed to one end of the second screw, and the other end of the second screw is threadedly connected to the female coupling. The outer diameter of the second pressure cap is equal to the inner diameter of the second groove.

9. The sleeve according to claim 3, characterized in that: The reset component is a compression spring, with one end of the compression spring abutting against the inside of the fixing hole and the other end abutting against the inner wall of the first fixing groove.

10. The sleeve according to claim 1, characterized in that: The female coupling has a second fixing groove at each end, and the second fixing groove is used to fix the second key block.

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