Lightweight underwater tubing hanger lifting tool

Abstract

The invention provides a light underwater tubing hanger lifting tool, and belongs to the field of Christmas trees and tubing hangers, the light underwater tubing hanger lifting tool comprises a lifting lug, a lifting body, a driving assembly, a check ring and a lock pin, the lifting lug is in threaded connection with the lifting body, the upper end of the lifting lug is provided with a shackle, and the lower end of the lifting lug extends into the lifting body and is connected with the driving assembly; a plurality of check rings and lock pins are detachably installed on the side wall of the lifting body, the check rings and the lock pins are arranged in a one-to-one correspondence mode, a spring is arranged between each set of corresponding check ring and lock pin, the spring is arranged on a lock column of the lock pin in a sleeving mode, one end of the lock pin stretches into the correspondingly-arranged check ring, and the other end of the lock pin makes contact with the driving assembly. The device is simple in structure, convenient to operate and high in safety, and meanwhile, the working efficiency can be effectively improved.

Description

Technical Field

[0001] This invention relates to the field of wellheads and tubing hangers, and more particularly to a lightweight underwater tubing hoisting tool. Background Technology

[0002] Currently, the hoisting and transportation of tubing hangers / wear-resistant repair cores at sea or on land is cumbersome and poses safety hazards. During the connection process between the tools and the tubing hangers / wear-resistant repair cores, workers need to connect the connecting pins to the tubing hangers / wear-resistant repair cores one by one. This is not only time-consuming and labor-intensive, but also makes it difficult to ensure that the docking depth of each connecting pin is consistent with that of the tubing hanger / wear-resistant repair core. Therefore, it is easy for some connecting pins to bear excessive load, thus posing a safety hazard. Summary of the Invention

[0003] In view of this, the present invention aims to provide a lightweight underwater oil pipe hoisting tool with a simple structure, convenient operation, high safety, and effective improvement of work efficiency.

[0004] To achieve the above objectives, the technical solution of the present invention is as follows: A lightweight underwater oil pipe hoisting tool includes a lifting lug, a lifting body, a drive assembly, retaining rings, and locking pins. The lifting lug and the lifting body are threaded together. A shackle is installed at the upper end of the lifting lug, and the lower end extends into the interior of the lifting body and connects to the drive assembly. Multiple retaining rings and locking pins are detachably installed on the side wall of the lifting body. The retaining rings and locking pins are arranged in a one-to-one correspondence. A spring is provided between each set of corresponding retaining rings and locking pins. The spring is sleeved on the locking post of the locking pin, and one end of the locking pin extends into the corresponding retaining ring, while the other end contacts the drive assembly.

[0005] Furthermore, the drive assembly includes a drive ring and a connecting plate. The connecting plate is detachably mounted on the upper end of the drive ring. A central hole is provided at the center of the connecting plate, and the lower end of the lifting lug extends into the central hole of the connecting plate and can rotate within the central hole of the connecting plate.

[0006] Furthermore, a threaded structure is provided on the outer wall of the lifting lug, and a first threaded hole is provided at the lower end of the lifting lug along the central axis. A locking bolt is connected in the first threaded hole. The locking bolt is located below the connecting plate, and a thrust cylindrical roller bearing is sleeved on the locking bolt. The thrust cylindrical roller bearing is located between the connecting plate and the head of the locking bolt.

[0007] Furthermore, the upper end of the lifting body is threaded with a stop screw. When the stop screw rotates downward, the lower end of the stop screw can abut against the upper end of the connecting plate.

[0008] Furthermore, a rotating handle is installed at the top of the locking screw, the lever arm length of which is adjustable, and a protective cap is detachably installed on the rotating handle.

[0009] Furthermore, the rotating handle and the stop screw are threaded together and are arranged perpendicular to each other. The rotating handle is a fully threaded hexagonal head bolt, and the protective cap is a cap nut.

[0010] Furthermore, the top of the lifting body is provided with a second threaded hole and a third threaded hole. The second threaded hole is used to connect the stop screw, and the third threaded hole is used to connect the lifting lug. The side wall of the lifting body is provided with multiple first placement cavities and second placement cavities. The first placement cavity is used to place the retaining ring, and the second placement cavity is used to place the locking pin. The first placement cavity and the second placement cavity are provided in a one-to-one correspondence and are connected. The bottom end of the lifting body is provided with multiple fourth threaded holes. One fourth threaded hole is provided below a first placement cavity and is connected to the first placement cavity. The fourth threaded hole is used to install the first screw. The stud of the first screw extends into the retaining ring and is threadedly connected to the retaining ring.

[0011] Furthermore, the locking pin includes a lock head and a locking pin that are connected to each other. The end of the locking pin away from the lock head is provided with a connecting platform, and the end of the lock head away from the locking pin is provided with a first inclined surface and a mating end face. The first inclined surface and the mating end face are set at an angle.

[0012] Furthermore, the upper end of the drive ring is provided with multiple fifth threaded holes, which are used to install the second screw. The drive ring and the connecting plate are detachably connected by the second screw. The outer side wall of the drive ring is provided with a first mating surface, a second inclined surface, and a second mating surface. The diameter of the first mating surface is larger than the diameter of the second mating surface. The second inclined surface is located between the first mating surface and the second mating surface, and one end of the second inclined surface is connected to the first mating surface, while the other end is connected to the second mating surface.

[0013] Furthermore, when the drive ring moves upward to its highest position, the connecting platform of the locking pin retracts from outside the retaining ring into the inner cavity of the retaining ring. At this time, the mating end face of the locking pin abuts against the second mating surface of the drive ring, and the first inclined surface of the locking pin is located below the second inclined surface of the drive ring. When the drive ring moves downward to its lowest position, the connecting platform of the locking pin extends from inside the retaining ring to outside the retaining ring. At this time, the mating end face of the locking pin abuts against the first mating surface of the drive ring, and the first inclined surface of the locking pin is located above the second inclined surface of the drive ring.

[0014] Compared with existing technologies, the lightweight underwater oil pipe hoisting tool described in this invention has the following advantages: (1) The drive component provided in this invention can simultaneously drive all the locking pins to lock or unlock the oil pipe hanger / anti-wear repair core, which effectively improves work efficiency; (2) The lifting lug, lifting body and drive assembly are coaxially arranged. When the lifting lug drives the drive assembly to move up and down, the force exerted by the drive assembly on the locking pin is the same, which ensures that the length of the locking pin extending to the retaining ring is the same. This allows all the locking pins to distribute the load evenly, avoiding the breaking of a certain locking pin due to excessive load. This effectively strengthens the overall load-bearing capacity of the lifting tool and improves safety and reliability. (3) The present invention has a simple structure. Workers can achieve hoisting and docking with the oil pipe hanger / anti-wear repair core by rotating the lifting lug. The operation is simple and saves time and effort. (4) The present invention is equipped with a stop screw, which can effectively prevent the lifting lug from rotating in the opposite direction, thereby avoiding the tool from being separated from the oil pipe hanger / anti-wear core due to the retraction of the locking pin, thus effectively improving safety. Attached Figure Description

[0015] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the structure of a lightweight underwater oil pipe hoisting tool according to an embodiment of the present invention; Figure 2 for Figure 1 The left view; Figure 3 This is a schematic diagram of the lifting lug structure according to an embodiment of the present invention; Figure 4 for Figure 3 Schematic diagram of the cross section of AA; Figure 5 This is a schematic diagram of the lifting body structure according to an embodiment of the present invention; Figure 6 This is a front view of the locking pin described in an embodiment of the present invention; Figure 7 This is a left view of the locking pin described in an embodiment of the present invention; Figure 8 This is a schematic diagram of the drive ring structure according to an embodiment of the present invention; Figure 9 This is a schematic diagram of the locking bolt according to an embodiment of the present invention.

[0016] Explanation of reference numerals in the attached figures: 1. Lifting lug; 11. Threaded structure; 12. First threaded hole; 2. Lifting body; 21. Second threaded hole; 22. Third threaded hole; 23. First placement cavity; 24. Second placement cavity; 25. Fourth threaded hole; 26. First screw; 3. Retaining ring; 4. Locking pin; 41. Lock head; 42. Locking pin; 43. Connecting platform; 44. First inclined surface; 45. Mating end face; 5. Spring; 6. Drive ring; 61. Fifth threaded hole; 62. First mating surface; 63. Second inclined surface; 64. Second mating surface; 7. Stop screw; 71. Rotating handle; 72. Protective cap; 8. Connecting plate; 81. Second screw; 9. Locking bolt; 91. Thrust cylindrical roller bearing; 92. Locking thread; 93. Mounting part; 10. Shackle. Detailed Implementation

[0017] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0018] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0019] like Figures 1-9As shown, the present invention is a lightweight underwater oil pipe hoisting tool, including a lifting lug 1, a lifting body 2, a drive assembly, a retaining ring 3, and a locking pin 4. The lifting lug 1, the lifting body 2, and the drive assembly are coaxially arranged. The lifting lug 1 and the lifting body 2 are threadedly connected. The upper end of the lifting lug 1 is equipped with a shackle 10, and the lower end extends into the interior of the lifting body 2 and is connected to the drive assembly. Multiple retaining rings 3 and locking pins 4 are detachably installed on the side wall of the lifting body 2. The retaining rings 3 and locking pins 4 are arranged in a one-to-one correspondence. A spring 5 is arranged between each set of corresponding retaining rings 3 and locking pins 4. The spring 5 is sleeved on the locking post 42 of the locking pin 4, and one end of the locking pin 4 extends into the corresponding retaining ring 3, while the other end contacts the drive assembly. The retaining ring 3 has an inwardly recessed groove on the end face near the locking pin 4. When the retaining ring 3 and the locking pin 4 are installed together, a placement area is formed between the groove and the locking head 41 of the locking pin 4. The spring 5 is placed in this placement area. The groove of the retaining ring 3 can limit one end of the spring 5, and the locking head 41 of the locking pin 4 can limit the other end of the spring 5. In the description of this invention, it should be understood that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In addition, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0020] The lifting lug 1 is used to drive the locking pin 4 and provide a lifting point. By applying force to the shackle 10, the lifting lug 1 can be screwed on, allowing it to move up or down along the second threaded hole 21. When the lifting lug 1 moves up or down, it can drive the drive assembly to move up and down. Specifically, when the drive assembly moves down, the drive ring 6 of the drive assembly continuously applies an outward force to the locking pin 4, allowing the connecting platform 43 of the locking pin 4 to extend outside the retaining ring 3. When the locking pin 4 is forced to move towards the retaining ring 3, the spring 5 is compressed, thus accumulating energy. When the drive assembly moves up, the locking head 41 of the locking pin 4 gradually transitions from engaging with the first mating surface 62 of the drive ring 6 to engaging with the second mating surface 64 of the drive ring 6. At this time, the energy accumulated by the spring 5 is gradually released, causing the connecting platform 43 on the locking pin 4 to gradually retract from outside the retaining ring 3 to inside the retaining ring 3 under the action of the spring 5. Since the lifting lug 1, the lifting body 2 and the drive assembly are coaxially arranged, when the lifting lug 1 drives the drive assembly to move up and down, the force exerted by the drive assembly on the locking pin 4 is the same. This ensures that the length of the locking pin 4 extending to the retaining ring 3 is the same, so that all the locking pins 4 can be evenly distributed to bear the load, avoiding the breakage caused by excessive load on a certain locking pin 4, and effectively improving safety and reliability. Preferably, the drive assembly includes a drive ring 6 and a connecting plate 8, with the connecting plate 8 detachably mounted on the upper end of the drive ring 6. To save costs, in practical applications, the drive ring 6 is a forging, and the connecting plate 8 is a sheet metal part, and the two are detachably connected by a second screw 81. A central hole is provided at the center of the connecting plate 8, and the lower end of the lifting lug 1 extends into the central hole of the connecting plate 8 and can rotate within the central hole. Preferably, the connection between the lifting lug 1 and the connecting plate 8 is a clearance fit.

[0021] Preferably, a threaded structure 11 is provided on the outer wall of the lifting lug 1, and a first threaded hole 12 is provided at the lower end of the lifting lug 1 along the central axis. A locking bolt is connected in the first threaded hole 12, and the locking bolt is connected to the first threaded hole 12 through a locking thread 92 provided thereon. The locking bolt is located below the connecting plate 8, and a thrust cylindrical roller bearing 91 is sleeved on the mounting part 93 of the locking bolt, and the thrust cylindrical roller bearing 91 is located between the connecting plate 8 and the head of the locking bolt. The presence of the thrust cylindrical roller bearing 91 makes the rotational connection between the lifting lug 1 and the connecting plate 8 easier.

[0022] Preferably, a stop screw 7 is threadedly connected to the upper end of the lifting body 2. The stop screw 7 is used to prevent the lifting lug 1 from rotating relative to the body. When the stop screw 7 rotates downward, its lower end can tightly abut against the upper end of the connecting plate 8. Through the stop screw 7, when the drive ring 6 descends to its position, it can effectively prevent the lifting lug 1 from rotating in the opposite direction, thereby avoiding the retraction of the locking pin 4 and the resulting disengagement of the tool from the tubing hanger / anti-wear repair core, effectively improving safety. The tubing hanger / anti-wear repair core is existing technology.

[0023] More preferably, a rotating handle 71 is mounted on the top of the locking screw 7. The lever arm length of the rotating handle 71 is adjustable, and a protective cap 72 is detachably mounted on the rotating handle 71. The rotating handle 71 allows the operator to rotate the locking screw 7 with minimal force. The adjustable lever arm length allows the operator to adjust the lever arm length according to their usage habits. The protective cap 72 prevents the rotating handle 71 from dislodging from the locking screw 7 and effectively prevents the top of the rotating handle 71 from causing injury to the operator.

[0024] In practical applications, the rotating handle 71 and the locking screw 7 are threadedly connected and are arranged perpendicularly to each other. The rotating handle 71 is a fully threaded hexagonal head bolt, and the protective cap 72 is a cap nut. Using standard fully threaded hexagonal head bolts and cap nuts effectively saves costs.

[0025] Preferably, the top end of the lifting body 2 is provided with a second threaded hole 21 and a third threaded hole 22. The second threaded hole 21 is used to connect the stop screw 7, and the third threaded hole 22 is used to connect the lifting lug 1. The side wall of the lifting body 2 is provided with a plurality of first placement cavities 23 and second placement cavities 24. The first placement cavity 23 is used to place the retaining ring 3, and the second placement cavity 24 is used to place the locking pin 4. The first placement cavity 23 and the second placement cavity 24 are provided in a one-to-one correspondence, and the corresponding first placement cavity 23 and the corresponding second placement cavity 24 are connected. The first placement cavity 23 and the second placement cavity 24 are evenly distributed in an array along the central axis of the lifting body 2. Preferably, there are eight first placement cavities 23 and eight second placement cavities 24. The inner diameter of the first placement cavity 23 is larger than the inner diameter of the second placement cavity 24. The bottom end of the lifting body 2 is provided with a plurality of fourth threaded holes 25. One fourth threaded hole 25 is provided below a first placement cavity 23 and is connected to the first placement cavity 23. The fourth threaded hole 25 is used to install a first screw 26. The stud of the first screw 26 extends into the retaining ring 3 and is threadedly connected to the retaining ring 3.

[0026] Preferably, the locking pin 4 includes a locking head 41 and a locking pin 42 connected to each other. The end of the locking pin 42 away from the locking head 41 is provided with a connecting platform 43. The end of the locking head 41 away from the locking pin 42 is provided with a first inclined surface 44 and a mating end face 45, which are arranged at an angle. When the locking pin 4 and the tubing hanger / anti-wear repair core are completed, the connecting platform 43 of the locking pin 4 can extend into the tubing hanger / anti-wear repair core, thereby achieving docking with the tubing hanger / anti-wear repair core.

[0027] Preferably, the upper end of the drive ring 6 is provided with a plurality of fifth threaded holes 61, which are used to install the second screw 81. The drive ring 6 and the connecting plate 8 are detachably connected by the second screw 81. The outer side wall of the drive ring 6 is provided with a first mating surface 62, a second inclined surface 63 and a second mating surface 64. The diameter of the first mating surface 62 is larger than the diameter of the second mating surface 64. The second inclined surface 63 is located between the first mating surface 62 and the second mating surface 64, and one end of the second inclined surface 63 is connected to the first mating surface 62 and the other end is connected to the second mating surface 64. As the drive ring 6 gradually descends from its highest position to its lowest position, the contact area between the first inclined surface 44 of the locking pin 4 and the second inclined surface 63 of the drive ring 6 gradually decreases, while the diameter of the second inclined surface 63 gradually increases from its lower end to its upper end. Therefore, the drive ring 6 drives the locking pin 4 to gradually extend outwards. When the locking head 41 of the locking pin 4 is completely pressed into the second placement cavity 24 by the drive ring 6, as the drive ring 6 continues to descend, the first mating surface 62 of the drive ring 6 begins to contact the mating end face 45 of the locking pin 4. Until the drive ring 6 descends to its lowest position, the first mating surface 62 of the drive ring 6 remains in contact with the mating end face 45 of the locking pin 4, thus ensuring that the connecting platform 43 of the locking pin 4 remains extended. When the drive ring 6 descends to its lowest position, the mating end face 45 of the locking pin 4 abuts against the first mating surface 62 of the drive ring 6, and the first inclined surface 44 of the locking pin 4 is positioned above the second inclined surface 63 of the drive ring 6. As the drive ring 6 gradually ascends from its lowest position to its highest position, the contact area between the first inclined surface 44 of the locking pin 4 and the second inclined surface 63 of the drive ring 6 gradually decreases, while the diameter of the second inclined surface 63 gradually increases from its lower end to its upper end. The contact area between the first mating surface 62 of the moving ring 6 and the mating end face 45 of the locking pin 4 gradually decreases. When the driving ring 6 moves upward to the point where the first mating surface 62 and the mating end face 45 of the locking pin 4 disconnect, the second inclined surface 63 of the driving ring 6 and the first inclined surface 44 of the locking pin 4 begin to contact. As the driving ring 6 continues to rise, the contact area between the second inclined surface 63 of the driving ring 6 and the first inclined surface 44 of the locking pin 4 gradually increases. Since the diameter of the second inclined surface 63 gradually decreases from the top to the bottom, the driving ring 6 gradually retracts inward under the action of the spring 5. When the locking pin 4 retracts to the point where the mating end face 45 and the second mating surface 64 of the driving ring 6 begin to contact, the connecting platform 43 of the locking pin 4 completely retracts into the retaining ring 3. When the driving ring 6 moves upward to its position, the second inclined surface 63 of the driving ring 6 and the first inclined surface 44 of the locking pin 4 are positioned opposite each other, and at the same time, the second mating surface 64 of the driving ring 6 and the mating end face 45 of the locking pin 4 are in contact. The first inclined surface 44 of the locking pin 4 is positioned below the second inclined surface 63 of the driving ring 6.

[0028] In actual operation, the lifting lug 1 and the stop screw 7 of the hoisting tool described in this invention are rotated to the upper position, at which point the locking pin 4 retracts. Then, the hoisting tool is connected to the oil pipe hanger / anti-wear core. After confirming the connection, the lifting lug 1 is rotated to the lower position, so that the locking pin 4 extends into the locking groove of the oil pipe hanger / anti-wear core. Then, the stop screw 7 is rotated to the lower position, so that the lower end of the stop screw 7 and the upper end of the connecting plate 8 are in close contact, thereby locking the lifting lug 1 and the body to prevent relative rotation. Then, normal hoisting operations can be carried out.

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A lightweight underwater oil pipe hoisting tool, characterized in that: The lifting lug (1), lifting body (2), drive assembly, retaining ring (3) and locking pin (4) are included. The lifting lug (1) and lifting body (2) are threaded together. The upper end of the lifting lug (1) is equipped with a shackle (10), and the lower end extends into the interior of the lifting body (2) and is connected to the drive assembly. Multiple retaining rings (3) and locking pins (4) are detachably installed on the side wall of the lifting body (2). The retaining rings (3) and locking pins (4) are set one-to-one. A spring (5) is set between each set of corresponding retaining rings (3) and locking pins (4). The spring (5) is sleeved on the locking post (42) of the locking pin (4), and one end of the locking pin (4) extends into the corresponding retaining ring (3), and the other end contacts the drive assembly.

2. The lightweight underwater oil pipe hoisting tool according to claim 1, characterized in that: The drive assembly includes a drive ring (6) and a connecting plate (8). The upper end of the drive ring (6) is detachably mounted with the connecting plate (8). A central hole is provided at the center of the connecting plate (8). The lower end of the lifting lug (1) extends into the central hole of the connecting plate (8) and can rotate in the central hole of the connecting plate (8).

3. The lightweight underwater oil pipe hoisting tool according to claim 2, characterized in that: A threaded structure (11) is provided on the outer wall of the lifting lug (1). A first threaded hole (12) is provided at the lower end of the lifting lug (1) along the central axis. A locking bolt is connected in the first threaded hole (12). The locking bolt is located below the connecting plate (8). At the same time, a thrust cylindrical roller bearing (91) is sleeved on the locking bolt. The thrust cylindrical roller bearing (91) is located between the connecting plate (8) and the head of the locking bolt.

4. A lightweight underwater oil pipe hoisting tool according to claim 2, characterized in that: The upper end of the lifting body (2) is threaded with a stop screw (7). When the stop screw (7) rotates downward, the lower end of the stop screw (7) can abut against the upper end of the connecting plate (8).

5. A lightweight underwater oil pipe hoisting tool according to claim 4, characterized in that: The top of the stop screw (7) is equipped with a rotating handle (71), the lever arm length of the rotating handle (71) is adjustable, and a protective cap (72) is detachably installed on the rotating handle (71).

6. A lightweight underwater oil pipe hoisting tool according to claim 5, characterized in that: The rotating handle (71) and the stop screw (7) are threaded together and are perpendicular to each other. The rotating handle (71) is a fully threaded hexagonal head bolt and the protective cap (72) is a cap nut.

7. A lightweight underwater oil pipe hoisting tool according to claim 1, characterized in that: The top of the lifting body (2) is provided with a second threaded hole (21) and a third threaded hole (22). The second threaded hole (21) is used to connect the stop screw (7), and the third threaded hole (22) is used to connect the lifting lug (1). The side wall of the lifting body (2) is provided with a plurality of first placement cavities (23) and second placement cavities (24). The first placement cavity (23) is used to place the retaining ring (3), and the second placement cavity (24) is used to place the locking pin (4). The first placement cavity (23) and the second placement cavity (24) are provided in a one-to-one correspondence, and the corresponding first placement cavity (23) and the second placement cavity (24) are connected. The bottom of the lifting body (2) is provided with a plurality of fourth threaded holes (25). A fourth threaded hole (25) is provided below a first placement cavity (23) and is connected to the first placement cavity (23). The fourth threaded hole (25) is used to install a first screw (26). The stud of the first screw (26) extends into the retaining ring (3) and is threadedly connected to the retaining ring (3).

8. A lightweight underwater oil pipe hoisting tool according to claim 1, characterized in that: The locking pin (4) includes a lock head (41) and a locking pin (42) connected to each other. The locking pin (42) has a connecting platform (43) at the end away from the lock head (41). The lock head (41) has a first inclined surface (44) and a mating end face (45) at the end away from the locking pin (42). The first inclined surface (44) and the mating end face (45) are set at an angle.

9. A lightweight underwater oil pipe hoisting tool according to claim 8, characterized in that: The upper end of the drive ring (6) is provided with a plurality of fifth threaded holes (61). The fifth threaded holes (61) are used to install the second screw (81). The drive ring (6) and the connecting plate (8) are detachably connected by the second screw (81). The outer side wall of the drive ring (6) is provided with a first mating surface (62), a second inclined surface (63) and a second mating surface (64). The diameter of the first mating surface (62) is larger than the diameter of the second mating surface (64). The second inclined surface (63) is located between the first mating surface (62) and the second mating surface (64). One end of the second inclined surface (63) is connected to the first mating surface (62) and the other end is connected to the second mating surface (64).

10. A lightweight underwater oil pipe hoisting tool according to claim 9, characterized in that: When the drive ring (6) moves up to the highest position, the connecting platform (43) of the locking pin (4) retracts from the outside of the retaining ring (3) into the inner cavity of the retaining ring (3). At this time, the mating end face (45) of the locking pin (4) and the second mating surface (64) of the drive ring (6) abut against each other, and the first inclined surface (44) of the locking pin (4) is located below the second inclined surface (63) of the drive ring (6). When the drive ring (6) moves down to the lowest position, the connecting platform (43) of the locking pin (4) extends from the inside of the retaining ring (3) to the outside of the retaining ring (3). At this time, the mating end face (45) of the locking pin (4) and the first mating surface (62) of the drive ring (6) abut against each other, and the first inclined surface (44) of the locking pin (4) is located above the second inclined surface (63) of the drive ring (6).

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