A tool for preventing stuck tubing

Abstract

This utility model discloses a coiled tubing anti-jamming tool, including an installation cylinder and a guide head. A guiding mechanism is provided on the outer side of the installation cylinder, comprising a sliding sleeve and guide wheels. The sliding sleeve slides on the outer wall of the installation cylinder and has a hinge frame on its outer side. Multiple sets of the hinge frame are provided, with both ends rotatably connected to the installation cylinder and the sliding sleeve. A connecting rod is rotatably connected to the outer wall of the installation cylinder. Multiple sets of the connecting rods are rotatably connected to the top of the hinge frame, each with an installation rod. Multiple sets of guide wheels are rotatably mounted on the outer wall of the installation rods. A quick-connect mechanism is provided between the guide head and the installation cylinder. The quick-connect mechanism includes a fixed sleeve and a locking block. The fixed sleeve is fixed to the bottom end of the installation cylinder. The hinge frame pushes the sliding sleeve to compress the compression spring, causing the multiple sets of guide wheels to adaptively adjust to the wellbore's inner wall. This articulated flexible adaptable structure effectively solves the problem that traditional fixed guiding structures cannot adaptively adjust according to changes in wellbore diameter.

Description

Technical Field

[0001] This utility model relates to the technical field, and more specifically, to a tool for preventing continuous tubing from jamming. Background Technology

[0002] In oil extraction operations, coiled tubing needs to be deployed thousands of meters deep into wells for downhole operations. Because the wellbore is not perfectly vertical, the tubing is prone to friction and collision with the well wall during descent, leading to wear and even jamming. Existing anti-jamming tools have significant shortcomings in wellbore guidance. Traditional anti-jamming tools mostly use fixed guide structures, which cannot adaptively adjust to changes in the wellbore diameter. When there are deviations in the well's inner diameter or local expansion or contraction, the fixed guide device either loses its guiding function due to excessive clearance with the well wall, or the contact is too tight, increasing descent resistance and even causing jamming. Some anti-jamming tools... Although the tool is equipped with guide wheels, there is a lack of an effective adaptive adjustment mechanism between the guide wheels and the tool body. It cannot automatically adjust the radial position of the guide wheels according to the actual size of the wellbore inner wall. As a result, the tubing will still deviate and collide during the lowering process due to poor guidance. Especially in deviated and horizontal well operations, the guide structure, which lacks flexible adaptability, cannot ensure that the tubing is always in the center of the wellbore. Frequent wellbore friction not only accelerates the wear of the tubing and guide device, but also increases the resistance and energy consumption of the lowering operation. In severe cases, it can even cause the tubing to jam, resulting in significant economic losses and operation delays.

[0003] During downhole operations, the guide head, as a key component at the bottom of the tubing, needs frequent replacement to adapt to different operational requirements or to replace worn parts. Existing anti-sticking tools have many limitations in the guide head connection methods. Although traditional threaded connections are strong, the threads are prone to adhesion and corrosion under the long-term effects of high temperature, high pressure and corrosive media downhole. Disassembly requires the use of large wrenches or special tools, and operators must perform heavy disassembly and assembly operations in the narrow wellhead space, which is not only time-consuming and labor-intensive but also poses safety hazards. Although snap ring connections are relatively easy to disassemble and assemble, the clamping force is often insufficient, and they are prone to loosening or even falling off under high-speed tubing descent and complex downhole conditions. Once the guide head detaches downhole, it will cause the entire operation system to fail and may cause downhole falling object accidents. Although some anti-sticking tools have a connection device between the guide head and the tool body, these connection devices lack reliable locking mechanisms and convenient unlocking methods. Either the locking force is insufficient to withstand the impact load of downhole operations, or the unlocking operation is complicated and requires multiple people to cooperate or multiple steps to complete, resulting in low on-site operation efficiency. Utility Model Content

[0004] (a) Technical problems to be solved In view of the problems existing in the prior art, this utility model provides a continuous tubing anti-jamming tool to solve the technical problems mentioned in the background art.

[0005] (II) Technical Solution To achieve the above objectives, this utility model provides the following technical solution: a continuous tubing anti-jamming tool, comprising an installation cylinder and a guide head. A guiding mechanism is provided on the outer side of the installation cylinder. The guiding mechanism includes a sliding sleeve and guide wheels. The sliding sleeve slides on the outer wall of the installation cylinder and has a hinge frame on its outer side. Multiple sets of hinge frames are provided, with both ends rotatably connecting the installation cylinder and the sliding sleeve. A connecting rod is rotatably connected to the outer wall of the installation cylinder. Multiple sets of connecting rods are rotatably connected to the top of the hinge frame, and installation rods are respectively provided. Multiple sets of guide wheels are rotatably mounted on the outer walls of multiple sets of installation rods. A quick-connect mechanism is provided between the guide head and the installation cylinder. The quick-connect mechanism includes a fixed sleeve and a locking block. The fixed sleeve is fixed to the bottom end of the installation cylinder. Multiple sets of locking blocks are provided, all rotatably mounted on the inner wall of the fixed sleeve. A locking groove is provided on the outer wall of the guide head, with multiple sets of locking grooves. An unlocking sleeve slides on the inner side of the fixed sleeve. A sliding groove is provided on the outer wall of the fixed sleeve, with multiple sets of sliding grooves. A control sleeve is fixed on the outer side of the unlocking sleeve, and the control sleeve slides within the multiple sets of sliding grooves.

[0006] The present invention is further configured such that the inner wall of the fixed sleeve is provided with a movable groove, the movable groove is provided with multiple sets and is rotatably connected to the locking blocks, and the outer wall of each set of locking blocks is connected to the movable groove with a push spring, the push spring is provided with multiple sets, the push spring provides elastic thrust to ensure that the locking blocks are reliably locked into the locking groove, the movable groove provides rotation space to realize radial contraction and expansion, and the multiple sets of locking blocks are evenly distributed to ensure balanced clamping force.

[0007] The present invention is further configured such that a force-applying spring is provided between the control sleeve and the fixed sleeve. The force-applying spring applies a pushing force to the control sleeve, and the force-applying spring keeps the control sleeve in a locked position to prevent accidental unlocking. Overcoming the pushing force allows for active unlocking, and the reset function ensures automatic return to the original position for easy installation next time.

[0008] The present invention is further configured such that an outer sleeve is fixedly and slidably provided on the outer wall of the fixed sleeve, and a return spring is provided between the outer sleeve and the fixed sleeve. The outer sleeve provides an operation interface for easy pushing, and the return spring stores elastic potential energy to push the outer sleeve and the control sleeve to automatically reset, eliminating the need for manual restoration and improving convenience.

[0009] The present invention is further configured such that a guide block is fixedly provided on the outer wall of the fixed sleeve, and a guide groove is provided on the inner wall of the outer sleeve. Multiple sets of guide blocks and guide grooves are provided and slidably connected. The cooperation between the guide blocks and guide grooves ensures that the outer sleeve moves smoothly along the axial direction, limits radial offset to ensure operational accuracy, and the multiple sets of design disperse the force to improve stability.

[0010] The present invention is further configured such that a compression spring is connected to the bottom surface of the fixed sleeve, and multiple compression springs are provided, with an abutment sleeve fixed at the bottom end. The compression spring pushes the abutment sleeve to realize the automatic separation of the sealing sleeve and the control sleeve. The elastic force ensures that the separation action is completed quickly, and the abutment sleeve evenly transmits the thrust to avoid local overload.

[0011] The present invention is further configured such that a sealing sleeve is fixedly provided on the outside of the guide head, and the sealing sleeve is inserted into the control sleeve to achieve a sealed connection to prevent well fluid leakage. It slides with the control sleeve to facilitate quick separation and protects the connection interface from corrosion by downhole media.

[0012] The present invention is further configured such that a compression spring is provided between the sliding sleeve and the mounting sleeve. The compression spring provides elastic thrust to keep the guide wheel in contact with the well wall. When the well diameter changes, the position of the sliding sleeve is automatically adjusted to achieve radial self-adaptation. The buffering effect absorbs collision impact and protects the guide structure.

[0013] (III) Beneficial Effects Compared with the prior art, this utility model provides a continuous tubing anti-jamming tool, which has the following beneficial effects: 1. This device employs a guiding mechanism on the outside of the mounting cylinder, comprising a sliding sleeve and guide wheels. When the mounting cylinder is placed inside the oil well, multiple sets of guide wheels abut against the inner wall of the well. The sliding sleeve, pushed by the hinged frame, compresses the compression spring, allowing the multiple sets of guide wheels to adaptively adjust to the inner wall of the well. This hinged, flexible, and adaptable structure effectively solves the problem of traditional fixed guiding structures being unable to adaptively adjust to changes in the wellbore diameter. It overcomes the issue that fixed guiding devices either lose their guiding function due to excessive clearance with the well wall or become too tight when there are deviations in the inner diameter of the oil well or local expansion or contraction. The drawback of reduced lowering resistance and even jamming is addressed by overcoming the shortcomings of existing guide wheels, which lack an effective adaptive adjustment mechanism between the guide wheel and the tool body and cannot automatically adjust the radial position of the guide wheel according to the actual size of the wellbore. This ensures that the tubing remains centered in the wellbore during lowering, preventing deviation and collision due to poor guidance. It is particularly suitable for the flexible adaptation requirements of deviated and horizontal well operations, effectively reducing wellbore friction and wear on the tubing and guide device, significantly reducing lowering resistance and energy consumption, and avoiding the risk of tubing jamming in the wellbore, resulting in significant economic losses and operational delays.

[0014] 2. This device features a quick-connect mechanism between the guide head and the mounting sleeve. This mechanism includes a fixed sleeve and multiple sets of locking blocks. When the guide head is inserted into the fixed sleeve, the outer wall of the guide head pushes the multiple sets of locking blocks to rotate and compress the push spring. After the guide head is fully inserted, the multiple sets of push springs reset and push the locking blocks into the slots to secure the guide head. This spring-driven self-locking locking structure changes the traditional threaded connection method, which requires large wrenches or special tools for disassembly. It overcomes the serious defects of ring-type connections, such as insufficient clamping force, which can easily loosen or even fall off during high-speed tubing descent and complex downhole conditions, leading to failure of the entire operating system and potential downhole debris accidents. The meshing of the multiple sets of locking blocks and slots provides strong clamping force to ensure it can withstand the impact loads of downhole operations. The automatic reset function of the push springs ensures reliable locking of the locking blocks, effectively avoiding the risk of the guide head detaching downhole.

[0015] 3. The quick-connect mechanism of this device has an outer sleeve fixedly sliding on the outer wall of the fixed sleeve and a return spring connected to the fixed sleeve. When disassembly is required, the control sleeve is pushed to compress the force spring and drive the unlocking sleeve to move. The unlocking sleeve pushes multiple sets of locking blocks to disengage from the locking slots and release the locking of the guide head. At the same time, the control sleeve pushes the outer sleeve to slide along the guide block through multiple sets of guide grooves and compresses the return spring. Multiple sets of compression springs push the abutment sleeve to push the sealing sleeve to separate from the control sleeve, thus completing the disassembly. The entire disassembly and assembly process is quick and simple, requiring no special tools such as wrenches, and can be completed independently by a single person. It effectively solves the problem of existing connection devices lacking a reliable locking mechanism and convenient unlocking means. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a continuous tubing anti-jamming tool according to the present invention; Figure 2 This is a schematic diagram of the disassembly structure of the guide head in this utility model; Figure 3 This is a cross-sectional view of the quick-connect mechanism in this utility model; Figure 4 This is a cross-sectional view of the outer sleeve in this utility model; Figure 5 This is a cross-sectional view of the guiding mechanism in this utility model.

[0017] In the diagram: 1. Mounting cylinder; 2. Guide head; 3. Sliding sleeve; 4. Guide wheel; 5. Hinge frame; 6. Connecting rod; 7. Mounting rod; 8. Fixing sleeve; 9. Locking block; 10. Locking groove; 11. Unlocking sleeve; 12. Sliding groove; 13. Control sleeve; 14. Movable groove; 15. Push spring; 16. Force spring; 17. Outer sleeve; 18. Return spring; 19. Guide block; 20. Guide groove; 21. Compression spring; 22. Abutment sleeve; 23. Sealing sleeve; 24. Compression spring. Detailed Implementation

[0018] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0019] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0020] In this utility model, unless otherwise stated, the orientations used, such as "up" and "down", usually refer to the direction shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0021] Please see Figures 1-5 A continuous tubing anti-jamming tool includes an installation cylinder 1 and a guide head 2. A guiding mechanism is provided on the outer side of the installation cylinder 1, including a sliding sleeve 3 and guide wheels 4. The sliding sleeve 3 slides on the outer wall of the installation cylinder 1, and a hinge frame 5 is provided on its outer side. Multiple sets of hinge frames 5 are provided, with both ends rotatably connecting the installation cylinder 1 and the sliding sleeve 3. Connecting rods 6 are rotatably connected to the outer wall of the installation cylinder 1. Multiple sets of connecting rods 6 are rotatably connected to the top ends of the hinge frames 5, and installation rods 7 are respectively rotatably connected to the top ends of the multiple sets of installation rods 7. Multiple sets of guide wheels 4 are provided and rotatably mounted on the outer sides of the multiple sets of installation rods 7. A quick-connect mechanism is provided between the guide head 2 and the mounting cylinder 1. The quick-connect mechanism includes a fixed sleeve 8 and a locking block 9. The fixed sleeve 8 is fixed to the bottom end of the mounting cylinder 1. The locking block 9 is provided in multiple sets and rotates on the inner wall of the fixed sleeve 8. The outer wall of the guide head 2 is provided with a locking groove 10. The locking groove 10 is provided in multiple sets. An unlocking sleeve 11 is slidably provided on the inner side of the fixed sleeve 8. A sliding groove 12 is provided on the outer wall of the fixed sleeve 8. The sliding groove 12 is provided in multiple sets. A control sleeve 13 is fixedly provided on the outer side of the unlocking sleeve 11. The control sleeve 13 slides in multiple sets of sliding grooves 12.

[0022] The inner wall of the fixed sleeve 8 is provided with a movable groove 14. The movable groove 14 is provided with multiple sets of rotatably connected locking blocks 9. The outer walls of the multiple sets of locking blocks 9 are all connected to the movable groove 14 with push springs 15. There are multiple sets of push springs 15.

[0023] A force-applying spring 16 is provided between the control sleeve 13 and the fixed sleeve 8, and the force-applying spring 16 applies a thrust to the control sleeve 13. An outer sleeve 17 is fixedly and slidably provided on the outer wall of the fixed sleeve 8, and a return spring 18 is provided between the outer sleeve 17 and the fixed sleeve 8.

[0024] The outer wall of the fixed sleeve 8 is fixedly provided with a guide block 19, and the inner wall of the outer sleeve 17 is provided with a guide groove 20. Multiple sets of guide blocks 19 and guide grooves 20 are provided and are slidably connected.

[0025] The bottom surface of the fixed sleeve 8 is connected to a compression spring 21. Multiple compression springs 21 are provided, and the bottom end is fixedly provided with an abutment sleeve 22.

[0026] A sealing sleeve 23 is fixedly provided on the outside of the guide head 2.

[0027] A compression spring 24 is provided between the sliding sleeve 3 and the mounting sleeve.

[0028] In this embodiment, during use, the guide head 2 is connected to the bottom end of the coiled tubing and installed using a quick-connect mechanism. The guide head 2 is inserted into the fixed sleeve 8. The outer wall of the guide head 2 pushes multiple sets of locking blocks 9 to rotate and compress the push spring 15. At the same time, the sealing sleeve 23 is inserted into the control sleeve 13 and slidably connected. When the guide head 2 is fully inserted into the fixed sleeve 8, the multiple sets of push springs 15 reset and push the locking blocks 9 to engage in the slots 10 to engage the guide head 2. Then, the installation cylinder 1 is placed in the oil well, and the multiple sets of guide wheels 4 abut against the inner wall of the oil well. The hinge frame 5 pushes the sliding sleeve 3 to compress the compression spring 24, so that the multiple sets of guide wheels 4 are adapted to the inner wall of the oil well. Then, the placement of the coiled tubing can be guided.

[0029] More specifically, when it is necessary to disassemble the guide head 2, the control sleeve 13 is pushed to compress the force spring 16 and drive the unlocking sleeve 11 to move. The unlocking sleeve 11 pushes multiple sets of locking blocks 9 to disengage from the locking slot 10 and release the locking of the guide head 2. At the same time, the control sleeve 13 pushes the outer sleeve 17 to slide along the guide block 19 through multiple sets of guide grooves 20 and compress the reset spring 18. The multiple sets of compression springs 21 push the abutment sleeve 22, and the abutment sleeve 22 pushes the sealing sleeve 23 to separate from the control sleeve 13, so that the guide head 2 can be disassembled.

[0030] In summary, the overall equipment is used or operated as follows: During use, the guide head 2 is connected to the bottom end of the coiled tubing and installed using the quick-connect mechanism. The guide head 2 is inserted into the fixed sleeve 8. The outer wall of the guide head 2 pushes multiple sets of locking blocks 9 to rotate and compress the push spring 15. At the same time, the sealing sleeve 23 is inserted into the control sleeve 13 and slidably connected. When the guide head 2 is fully inserted into the fixed sleeve 8, the multiple sets of push springs 15 reset and push the locking blocks 9 to engage in the slots 10 to engage the guide head 2. Then, the installation cylinder 1 is placed in the oil well, and the multiple sets of guide wheels 4 abut against the inner wall of the oil well. The hinge frame 5 pushes the sliding sleeve 3 to compress the compression spring 24, so that the multiple sets of guide wheels 4 are adapted to the inner wall of the oil well. Then, the placement of the coiled tubing can be guided.

[0031] When it is necessary to disassemble the guide head 2, push the control sleeve 13 to compress the force spring 16 and drive the unlocking sleeve 11 to move. The unlocking sleeve 11 pushes multiple sets of locking blocks 9 to disengage from the locking slot 10 and release the locking of the guide head 2. At the same time, the control sleeve 13 pushes the outer sleeve 17 to slide along the guide block 19 through multiple sets of guide grooves 20 and compress the reset spring 18. Through multiple sets of compression springs 21, push the abutment sleeve 22. The abutment sleeve 22 pushes the sealing sleeve 23 to separate from the control sleeve 13, so that the guide head 2 can be disassembled.

[0032] Of all the solutions mentioned above, those involving connections between two components can be selected based on the actual situation, such as welding, bolt and nut connection, bolt or screw connection, or other well-known connection methods. These will not be elaborated on here. For all the fixed connections mentioned above, welding is the preferred option. In all the solutions mentioned above, the operation of electrical components, unless otherwise specified, is controlled by a controller. Since the devices matched with the controllers are common devices, their control principles and wiring connections are existing, well-known, and mature technologies, and their specific circuit structures will not be described in detail here. The specific models and specifications of the electrical components involved in this solution need to be selected and determined according to the actual specifications of the device. The specific selection and calculation methods adopt existing technologies in this field, and therefore will not be described in detail. Of all the solutions mentioned above, those involving motors can be combined with reducers if necessary. The connection structure and working principle between the motor and the reducer are existing known technologies and will not be described in detail in this utility model. Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A coiled tubing anti-jamming tool, comprising an installation cylinder (1) and a guide head (2), characterized in that: A guiding mechanism is provided on the outside of the mounting cylinder (1). The guiding mechanism includes a sliding sleeve (3) and a guide wheel (4). The sliding sleeve (3) slides on the outer wall of the mounting cylinder (1) and is provided with a hinge frame (5) on the outside. The hinge frame (5) is provided in multiple sets and is rotatably connected at both ends to the mounting cylinder (1) and the sliding sleeve (3). A connecting rod (6) is rotatably connected to the outer wall of the mounting cylinder (1). The multiple sets of connecting rods (6) are rotatably connected to the top of the hinge frame (5) and are respectively provided with mounting rods (7). The guide wheel (4) is provided in multiple sets and is rotatably installed on the outer wall of the multiple sets of mounting rods (7). The guide head (2) is connected to the mounting cylinder (1). A quick-connect mechanism is provided between them. The quick-connect mechanism includes a fixed sleeve (8) and a locking block (9). The fixed sleeve (8) is fixed to the bottom end of the mounting cylinder (1). The locking block (9) is provided in multiple sets and rotates on the inner wall of the fixed sleeve (8). The outer wall of the guide head (2) is provided with a locking groove (10). The locking groove (10) is provided in multiple sets. The inner side of the fixed sleeve (8) is provided with an unlocking sleeve (11). The outer wall of the fixed sleeve (8) is provided with a sliding groove (12). The sliding groove (12) is provided in multiple sets. The outer side of the unlocking sleeve (11) is fixed with a control sleeve (13). The control sleeve (13) slides in multiple sets of sliding grooves (12).

2. The coiled tubing backoff tool of claim 1, wherein: The inner wall of the fixed sleeve (8) is provided with a movable groove (14). The movable groove (14) is provided with multiple sets of rotatably connected locking blocks (9). The outer walls of the multiple sets of locking blocks (9) are connected to the movable groove (14) with push springs (15). The push springs (15) are provided with multiple sets.

3. The coiled tubing backoff tool of claim 2, wherein: A force-applying spring (16) is provided between the control sleeve (13) and the fixed sleeve (8), and the force-applying spring (16) applies a thrust to the control sleeve (13).

4. The coiled tubing backoff tool of claim 3, wherein: An outer sleeve (17) is fixedly and slidably provided on the outer wall of the fixed sleeve (8), and a return spring (18) is provided between the outer sleeve (17) and the fixed sleeve (8).

5. The coiled tubing backoff tool of claim 4, wherein: The outer wall of the fixed sleeve (8) is fixedly provided with a guide block (19), and the inner wall of the outer sleeve (17) is provided with a guide groove (20). The guide block (19) and the guide groove (20) are provided with multiple sets and are slidably connected.

6. A coiled tubing backoff tool as defined in claim 5, characterized by: The bottom surface of the fixed sleeve (8) is connected to a compression spring (21), and multiple sets of the compression spring (21) are provided, with an abutment sleeve (22) fixed at the bottom end.

7. The coiled tubing backoff tool of claim 6, wherein: A sealing sleeve (23) is fixedly provided on the outside of the guide head (2).

8. The coiled tubing backoff tool of claim 7, wherein: A compression spring (24) is provided between the sliding sleeve (3) and the mounting sleeve.

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