Retractable spiral retrieval cylinder

Abstract

This utility model discloses a retractable spiral retrieval cylinder, including an installation cylinder, a guiding mechanism, and a sealing mechanism. The installation cylinder is equipped with a retractable retrieval mechanism and a convenient connection mechanism. The retractable retrieval mechanism includes a conical groove, inside which a spiral claw is engaged. The inner side of the spiral claw has a threaded groove. A claw controller is fixedly connected to the lower side of the spiral claw, and the claw controller is fixedly connected inside the installation cylinder. The convenient connection mechanism includes a top connecting cylinder with a top groove and a limit groove inside. Through the retractable retrieval mechanism, if jamming occurs during retrieval, the drill bit is suddenly lowered and torque is applied. The claw controller receives a reverse thrust, causing the spiral claw to slide upwards along the conical groove. At this time, the conical expansion increases the inner diameter of the spiral claw, and the threaded groove gradually disengages from the object, allowing the retrieval cylinder to be safely removed from the object, avoiding the risk of secondary drill jamming.

Description

Technical Field

[0001] This utility model relates to the field of oil pumping unit parts salvage technology, specifically a retractable spiral salvage cylinder. Background Technology

[0002] A retrieval barrel is an important tool used in oil and gas drilling and well workover operations to retrieve objects that have fallen into the well. Its core function is to grab and extract drill strings, tools, or other objects that have fallen into the well through a specific structure. It is mainly used to recover pipe and string objects (such as drill pipes, tubing, tool joints, etc.) that have fallen into the well during the drilling process. The falling objects are clamped or locked by a mechanical structure and then lifted out by the drill string to restore wellbore access or recover valuable equipment.

[0003] In oil drilling and well workover operations, current mainstream fishing barrels mostly employ a spiral slip structure to ensure clamping reliability and accommodate regular cylindrical objects such as drill pipes and tubing. However, existing spiral slip fishing barrels are primarily non-removable, presenting two major drawbacks: firstly, they cannot be retracted when encountering obstruction, easily leading to the risk of secondary stuck drill bit; secondly, the disassembly and assembly process of the connecting components with the drill string is cumbersome, requiring frequent use of auxiliary tools (such as hydraulic tongs), which reduces construction efficiency and increases labor costs in the high-intensity working environment of the well site, resulting in poor practicality. Therefore, to solve the above problems, a removable spiral fishing barrel is proposed. Utility Model Content

[0004] The present invention mainly addresses the technical problems existing in the prior art by providing a retractable spiral retrieval cylinder.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a retractable spiral retrieval cylinder, comprising an installation cylinder, a guiding mechanism, and a sealing mechanism. The installation cylinder is equipped with a retractable retrieval mechanism and a convenient connection mechanism. The retractable retrieval mechanism includes a conical groove, inside which a spiral claw is engaged. The inner side of the spiral claw is engaged with a threaded groove. A claw controller is fixedly connected to the lower side of the spiral claw, and the claw controller is fixedly connected inside the installation cylinder. The convenient connection mechanism includes a top-connecting cylinder, inside which a top groove is formed. A limit groove is formed inside the top-connecting cylinder, and a sliding groove is formed inside the top-connecting cylinder. A sliding plate is provided inside the sliding groove. The cylinder has a first docking groove inside, and the slide has a second docking groove through it. A connecting plate is fixedly connected to the upper side of the slide, and a first fixing hole is through it on the surface of the connecting plate. A locking block is set inside the limiting groove, and a connecting rod is fixedly connected to the upper side of the locking block. A second fixing hole is through it on the inside of the connecting rod. The spiral claw is a conical elastic component with a threaded groove on its inner wall that matches the outer surface of the object. When the drill bit is suddenly lowered and torque is applied, the claw controller slides along the conical surface of the cylinder due to the reverse thrust. The conical surface expands, increasing the inner diameter of the jaw. The thread slowly disengages from the object, allowing the retrieval cylinder to be removed from the object. The first fixing hole matches the second fixing hole.

[0006] Preferably, the card block is slidably connected to the first docking groove and the second docking groove, and the slide plate is slidably connected to the slide groove. After the card block is docked through the first docking groove and the second docking groove, the card block can slide into the limiting groove. Then the first docking groove and the second docking groove are offset, so that the card block can be restricted in the limiting groove.

[0007] Preferably, four connecting plates are provided. The sliding groove is located on the upper side of the limiting groove, and the limiting groove is located on the upper side of the top groove. With four connecting plates, after rotating the connecting plate to 45 degrees, the first fixing hole and the second fixing hole are aligned. During docking, the first docking groove and the second docking groove are staggered. The connecting plate and the connecting rod can be locked together by bolts passing through the first fixing hole and the second fixing hole.

[0008] Preferably, the conical groove is formed inside the mounting cylinder, and the upper end of the connecting rod is fixedly connected to a flange. The upper part of the connecting rod extends to the upper side of the top connecting cylinder. The connecting rod can be connected to the transmission device through the flange, and the transmission device can drive the retrieval cylinder to move down into the oil well.

[0009] Preferably, the guiding mechanism includes a first threaded ring, which is fixedly connected to the lower side of the mounting cylinder. The external thread of the first threaded ring is connected to a lip-type guide shoe. The guide shoe is an important auxiliary component of downhole tools such as fishing cylinders, casings, and tubing. It is installed at the lower end of the tool and its main function is to guide the tool to be smoothly lowered into the well and aligned with the object, so as to avoid the tool getting stuck due to irregular wellbore or displacement of the object position.

[0010] Preferably, the sealing mechanism includes a second threaded ring, which is fixedly connected to the upper side of the mounting cylinder. The outer thread of the second threaded ring is connected to a connecting cylinder, and a rubber barrier ring is fixedly connected inside the connecting cylinder. After the object enters the mounting cylinder, it can continue to move into the connecting cylinder and pass through the rubber barrier ring, thereby achieving layer separation.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0012] 1. This utility model, through the design of a retractable retrieval mechanism, allows for easy removal of the retrieval cylinder if jamming occurs during the retrieval process. A sudden drop of the drill bit with applied torque generates a reverse thrust on the chuck controller, causing the spiral chuck to slide upwards along the conical groove. The expansion of the conical surface increases the inner diameter of the spiral chuck, gradually disengaging the threaded groove from the object, thus safely removing the retrieval cylinder from the object and avoiding the risk of secondary drill jamming.

[0013] 2. This utility model, through the setting of a convenient connection mechanism, inserts the locking block at the lower end of the connecting rod into the first docking groove inside the top connecting cylinder, then pushes the sliding plate to align its second docking groove with the first docking groove, and the locking block slides into the second docking groove and enters the limiting groove; then rotates the four connecting plates forty-five degrees to offset the first docking groove from the second docking groove, and the locking block is restricted in the limiting groove; finally, the connecting plate and the connecting rod are locked by bolts passing through the first fixing hole and the second fixing hole, and the connection between the retrieval cylinder and the drilling tool can be completed with only one bolt; this greatly improves construction efficiency and makes installation and disassembly more convenient. Attached Figure Description

[0014] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0015] Figure 1 This is a frontal view of the overall structure of this utility model;

[0016] Figure 2 This is a frontal view of the overall explosion structure of this utility model;

[0017] Figure 3 This is a structural schematic diagram of the exploded cross-section of this utility model.

[0018] In the diagram: 1. Mounting cylinder; 2. Conical groove; 3. Spiral claw; 4. Threaded groove; 5. Claw controller; 6. Top connecting cylinder; 7. Top groove; 8. Limiting groove; 9. Sliding groove; 10. Sliding plate; 11. First mating groove; 12. Second mating groove; 13. Connecting plate; 14. First fixing hole; 15. Clamping block; 16. Connecting rod; 17. Second fixing hole; 18. Flange; 19. First threaded ring; 20. Cut-lip type guide shoe; 21. Second threaded ring; 22. Connecting cylinder; 23. Rubber barrier ring. Detailed Implementation

[0019] 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.

[0020] Please see Figure 1-3The retractable spiral retrieval cylinder includes an installation cylinder 1, a guiding mechanism, and a sealing mechanism. The installation cylinder 1 is equipped with a retractable retrieval mechanism and a convenient connection mechanism. The retractable retrieval mechanism includes a conical groove 2, inside which a spiral claw 3 is engaged. The inner side of the spiral claw 3 is equipped with a threaded groove 4. A claw controller 5 is fixedly connected to the lower side of the spiral claw 3 and is fixedly connected inside the installation cylinder 1. The convenient connection mechanism includes a top-connecting cylinder 6, inside which a top groove 7, a limit groove 8, and a sliding groove 9 are provided. A sliding plate 10 is installed inside the sliding groove 9. A first docking groove 11 is engaged inside the top-connecting cylinder 6, and the sliding plate 10 is penetrated internally. A second docking groove 12 is provided. A connecting plate 13 is fixedly connected to the upper side of the slide plate 10. A first fixing hole 14 is provided through the surface of the connecting plate 13. A locking block 15 is provided inside the limiting groove 8. A connecting rod 16 is fixedly connected to the upper side of the locking block 15. A second fixing hole 17 is provided through the interior of the connecting rod 16. The locking block 15 is slidably connected to the first docking groove 11 and the second docking groove 12. The slide plate 10 is slidably connected to the sliding groove 9. Four connecting plates 13 are provided. The sliding groove 9 is located on the upper side of the limiting groove 8. The limiting groove 8 is located on the upper side of the top groove 7. When the retrieval cylinder is aligned with the object in the well through the guide mechanism, when the drill string is lifted, the spiral claw 3 slides down the conical locking groove 2 inside the mounting cylinder 1 under the action of the pulling force. Due to the compression of the conical groove 2, the inner diameter of the spiral chuck 3 contracts, and the threaded groove 4 on its inner side tightly engages with the outer surface of the object, forming a "tighter the more you lift" clamping effect similar to tightening a bolt, thus firmly gripping the object. If the retrieval process encounters obstruction, the drill bit is suddenly lowered and torque is applied. The chuck controller 5 receives a reverse thrust, causing the spiral chuck 3 to slide upward along the conical groove 2. At this time, the conical expansion increases the inner diameter of the spiral chuck 3, and the threaded groove 4 gradually disengages from the object, allowing the retrieval cylinder to be safely removed from the object, avoiding the risk of secondary drill jamming. The locking block 15 at the lower end of the connecting rod 16 is aligned with the first docking groove 11 inside the top connecting cylinder 6 and inserted. Then, the sliding plate 10 is pushed to align its second docking groove 12 with the first docking groove 11. The locking block 15 slides into the second docking groove 12 and enters the limiting groove 8. Next, rotate the four connecting plates 13 by 45 degrees to offset the first docking groove 11 from the second docking groove 12, thus restricting the locking block 15 within the limiting groove 8. Finally, by passing bolts through the first fixing hole 14 and the second fixing hole 17, the connecting plate 13 and the connecting rod 16 are locked together, completing the connection between the retrieval cylinder and the drill bit. Unscrew the fixing bolts, rotate the connecting plate 13 in the opposite direction to align the first docking groove 11 and the second docking groove 12 again, and pull the slide plate 10 to disengage the locking block 15 from the limiting groove 8, thus quickly separating the retrieval cylinder from the drill bit. Compared to the cumbersome disassembly and assembly methods that require the use of hydraulic pliers and other tools, this structure significantly improves construction efficiency.

[0021] In one aspect of this embodiment, the conical groove 2, as the core structure of the retractable retrieval mechanism, is built into the mounting cylinder 1. Its inclined inner wall forms a sliding fit with the outer conical surface of the spiral claw 3, providing a mechanical basis for clamping during retrieval and unlocking during cylinder retraction. The flange 18 at the upper end of the connecting rod 16, as the hub connecting the retrieval cylinder to the external power equipment, can be stably connected to the transmission device, making the lowering and raising operations of the retrieval cylinder in the oil well more precise and ensuring the smooth progress of the retrieval operation.

[0022] In one aspect of this embodiment, the first threaded ring 19 on the lower side of the mounting cylinder 1 is connected to the lip-type guide shoe 20. During the descent into the well, the lip-type guide shoe 20 uses its streamlined structure to guide the retrieval cylinder to slide down the well wall, accurately aligning it with the object, avoiding tool jamming due to irregular wellbore, and laying the foundation for the retrieval operation.

[0023] In one aspect of this embodiment, the second threaded ring 21 on the upper side of the mounting cylinder 1 is connected to the connecting cylinder 22 with a rubber barrier ring 23. When the object enters the mounting cylinder 1, it continues to move upward through the rubber barrier ring 23, which can separate different layers in the well barrel, prevent interlayer fluid interference, and further expand the functional applicability of the retrieval cylinder.

[0024] The working principle of this utility model is as follows: When using this retractable spiral retrieval cylinder, the guide shoe 20 of the guide mechanism cooperates with the first threaded ring 19 to smoothly guide the installation cylinder 1 into the well and align it with the fallen object. During retrieval, the drill string is lifted, and the spiral chuck 3 slides down along the conical groove 2. Under the compression of the conical surface, the inner diameter shrinks, and the inner threaded groove 4 of the spiral chuck tightly engages with the outer surface of the fallen object, achieving a firm grip. If there is any obstruction and it needs to be withdrawn, the drill string is suddenly lowered and torque is applied. The chuck controller 5 drives the spiral chuck 3 to slide up along the conical groove 2, increasing the inner diameter of the chuck and disengaging it from the fallen object. The locking block 15 at the lower end of the connecting rod 16 is aligned with the first docking groove 11 in the top connecting cylinder 6 and inserted. Then, the sliding plate 10 is pushed so that its second docking groove 12 aligns with the first docking groove 11. The locking block 15 slides into the second docking groove 12 and enters the limiting groove 8. Next, rotate the four connecting plates 13 by 45 degrees to offset the first docking groove 11 from the second docking groove 12, thus restricting the locking block 15 within the limiting groove 8. Finally, by passing bolts through the first fixing hole 14 and the second fixing hole 17, the connecting plate 13 and the connecting rod 16 are locked together, completing the connection between the retrieval cylinder and the drill bit; disassembly is performed by reversing the operation.

[0025] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the 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 this utility model should be included within the protection scope of this utility model.

Claims

1. A retractable spiral retrieval cylinder, comprising an installation cylinder (1), a guiding mechanism, and a sealing mechanism, characterized in that: The mounting cylinder (1) is equipped with a retractable retrieval mechanism and a convenient connection mechanism. The retractable retrieval mechanism includes a conical groove (2), inside which a spiral claw (3) is engaged. The inner side of the spiral claw (3) is engaged with a threaded groove (4). A claw controller (5) is fixedly connected to the lower side of the spiral claw (3). The claw controller (5) is fixedly connected inside the mounting cylinder (1). The convenient connection mechanism includes a top connecting cylinder (6), inside which a top groove (7) is opened. Inside the top connecting cylinder (6) a limit groove (8) is opened. (6) has a sliding groove (9) inside, and a sliding plate (10) is provided inside the sliding groove (9). The top connecting cylinder (6) has a first docking groove (11) inside, and a second docking groove (12) is provided through the sliding plate (10). A connecting plate (13) is fixedly connected to the upper side of the sliding plate (10). A first fixing hole (14) is provided through the surface of the connecting plate (13). A locking block (15) is provided inside the limiting groove (8). A connecting rod (16) is fixedly connected to the upper side of the locking block (15). A second fixing hole (17) is provided through the interior of the connecting rod (16).

2. The retractable spiral retrieval cylinder according to claim 1, characterized in that: The card block (15) is slidably connected to the first docking groove (11) and the second docking groove (12), and the slide plate (10) is slidably connected to the slide groove (9).

3. The retractable spiral retrieval cylinder according to claim 1, characterized in that: The connecting plate (13) is provided in four parts, the sliding groove (9) is provided on the upper side of the limiting groove (8), and the limiting groove (8) is provided on the upper side of the top groove (7).

4. The retractable spiral retrieval cylinder according to claim 1, characterized in that: The conical groove (2) is opened inside the mounting cylinder (1), and the upper end of the connecting rod (16) is fixedly connected to the flange (18).

5. The retractable spiral retrieval cylinder according to claim 1, characterized in that: The guiding mechanism includes a first threaded ring (19), which is fixedly connected to the lower side of the mounting cylinder (1), and the external thread of the first threaded ring (19) is connected to a cut-lip type guide shoe (20).

6. The retractable spiral retrieval cylinder according to claim 1, characterized in that: The sealing mechanism includes a second threaded ring (21), which is fixedly connected to the upper side of the mounting cylinder (1). The external thread of the second threaded ring (21) is connected to a connecting cylinder (22), and a rubber barrier ring (23) is fixedly connected inside the connecting cylinder (22).

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