Spiral self-tightening type oil pipe anti-jacking slip

Abstract

The utility model relates to a spiral self-tightening type oil pipe anti-jacking slip which is applied to the technical field of oil field workover equipment and comprises a mounting base, a plurality of clamping mechanisms, a pressing ring and a driving mechanism, each clamping mechanism comprises a clamping block, the clamping blocks are arranged on the mounting base in a sliding mode, the multiple clamping blocks are distributed in a circumferential mode, and oil pipe clamping space is formed between the multiple clamping blocks; the inner side ring surface of the pressing ring is a conical surface, the pressing ring is arranged on the multiple clamping blocks in a sleeving mode from top to bottom, and the ends, away from the oil pipe clamping space, of the multiple clamping blocks are matched with the inner side ring surface of the pressing ring; the driving mechanism is used for driving the pressing ring to do lifting motion. According to the oil pipe clamping device, the pressing ring is arranged, when the driving mechanism drives the pressing ring to move downwards, the inner side face of the pressing ring abuts against the multiple clamping blocks, the multiple clamping blocks synchronously move towards one side of the oil pipe clamping space till the ends of the multiple clamping blocks abut against the annular face of the oil pipe, and the oil pipe is clamped; due to the fact that the ends, away from the oil pipe clamping space, of the clamping blocks are matched with the inner side ring face of the pressing ring, the clamping blocks are narrow in upper portions and wide in lower portions, the oil pipe is jacked upwards, the clamping blocks clamp the oil pipe more tightly, and the self-tightening effect is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of oilfield well repair equipment, and in particular to a spiral self-tightening oil pipe anti-lifting slip. Background Art

[0002] There are risks of overflow, well kick, and even blowout at the workover site, and there is a possibility of tubing uplift. Therefore, the tubing anti-uplift device must be equipped as one of the necessary well control devices at the work site.

[0003] In the prior art, the anti-uplift device for oil pipes includes gate-type slips, self-tightening anti-uplift slips, etc. The gate-type slips can prevent both falling and uplifting, and are easy to open and close, but they rely entirely on the oil cylinder oil pressure to clamp the oil pipe during operation, and can only be used in pressurized operations in relatively low-pressure wells, and have no self-tightening function. Although the self-tightening anti-uplift slips can achieve self-tightening, due to the uplifting force on the oil pipe, the slips are not easy to open, and the operation is relatively complicated.

[0004] In view of this, there is an urgent need for a spiral self-tightening oil pipe anti-lifting slip to solve the above problems. Summary of the invention

[0005] In order to help solve the problems existing in the prior art, the present application provides a spiral self-tightening oil pipe anti-lifting slip, which adopts the following technical solution: comprising: a mounting seat, a plurality of clamping mechanisms, a clamping ring and a driving mechanism, wherein the clamping mechanism comprises a clamping block, which is slidably arranged on the mounting seat, and the plurality of clamping blocks are distributed in a circumference, and there is an oil pipe clamping space between the plurality of clamping blocks;

[0006] The inner ring surface of the clamping ring is a conical surface, and the clamping ring is sleeved on a plurality of clamping blocks from top to bottom, and one end of the plurality of clamping blocks away from the oil pipe clamping space is adapted to the inner ring surface of the clamping ring;

[0007] The driving mechanism is used to drive the clamping ring to perform lifting motion;

[0008] Through the above technical solution, when the clamping ring moves downward, the inner side surface of the clamping ring abuts against multiple clamping blocks, so that the multiple clamping blocks move synchronously to one side of the oil pipe clamping space until the ends of the multiple clamping blocks abut against the oil pipe annular surface, thereby clamping the oil pipe. When the oil pipe is pushed upward, since the end of the clamping block away from the oil pipe clamping space is adapted to the inner annular surface of the clamping ring, the clamping block is narrow at the top and wide at the bottom. The higher the oil pipe is pushed, the tighter the clamping block clamps, thereby playing a self-tightening role.

[0009] In a specific possible implementation scheme, the driving mechanism includes a control ring and a driving assembly for driving the control ring to rotate, the control ring is rotatably arranged on a mounting seat, the inner ring surface of the control ring and the outer ring surface of the clamping ring are both provided with threads, the control ring is threadedly connected to the clamping ring, a positioning rod is vertically arranged on the mounting seat, a positioning hole is opened on the clamping ring, and the clamping ring is mounted on the positioning rod through the positioning hole.

[0010] Through the above technical solution, since the clamping ring is restricted by the positioning rod, the clamping ring can only move axially along the positioning rod. The control ring is driven to rotate by the driving assembly, so that the clamping ring threadedly connected to the control ring performs lifting and lowering movements, thereby achieving synchronous movement of multiple clamping blocks.

[0011] In a specific possible implementation scheme, the drive assembly includes a motor, a driving wheel and a bevel gear, the motor is placed on a mounting seat, the driving wheel is coaxially arranged at the output end of the motor, the bevel gear is arranged on the mounting seat, the outer ring surface of the control ring is provided with a rack adapted to the bevel gear, and the bevel gear is meshed with both the driving wheel and the clamping ring.

[0012] Through the above technical solution, a motor is used to rotate the driving wheel, which rotates the bevel gear, and then rotates the control ring, so that the driving clamping ring performs lifting motion.

[0013] In a specific possible implementation scheme, the clamping mechanism also includes a guide assembly, which includes a mounting plate and two guide rods arranged on a mounting seat, the two guide rods are horizontally arranged on the mounting plate, and a connecting seat is arranged at the bottom end of the clamping block, and the two guide rods are passed through the connecting seat.

[0014] Through the above technical solution, two guide rods are used to guide the movement of the connecting seat, so that the clamping block moves along the axial direction of the two guide rods, so as to accurately clamp the oil pipe.

[0015] In a specific possible implementation scheme, the guide rods are all sleeved with springs, one end of the springs is connected to the guide rods, and the other end of the springs is connected to the connecting seat.

[0016] Through the above technical solution, the spring is placed on the guide rod. When the clamping block clamps the oil pipe, the connecting seat compresses the spring. When the clamping ring moves upward, the elastic force of the spring resets the connecting seat and the clamping block.

[0017] In a specific possible implementation manner, the guide assembly further comprises a slide rail, the slide rail is arranged on the mounting seat, and the connecting seat is slidably arranged on the slide rail.

[0018] Through the above technical solution, the setting of the slide rail can further guide and limit the movement of the connecting seat.

[0019] In a specific possible implementation manner, bearings are arranged on the plurality of mounting plates, and the control ring is arranged on the bearings.

[0020] Through the above technical solution, the control ring is connected to the mounting seat through the bearing, so that the friction of the control ring during rotation is reduced, making the rotation smoother.

[0021] In a specific possible implementation manner, three clamping mechanisms are provided.

[0022] Through the above technical solution, three clamping mechanisms are provided so that the oil pipe is clamped by three clamping blocks.

[0023] In a specific possible implementation mode, the clamping block is provided with anti-slip stripes on one side close to the oil pipe clamping space.

[0024] Through the above technical solution, anti-slip stripes are provided to further improve the stability of clamping the oil pipe.

[0025] In a specific possible implementation manner, a protective sleeve is arranged above the mounting seat, and the protective sleeve is arranged on the outer side of the control ring.

[0026] Through the above technical solution, by providing the protective cover, the structure inside the protective cover is protected.

[0027] To summarize, by setting a clamping ring, when the driving mechanism drives the clamping ring to move downward, the inner side surface of the clamping ring abuts against multiple clamping blocks, so that the multiple clamping blocks move synchronously to one side of the oil pipe clamping space until the ends of the multiple clamping blocks abut against the oil pipe annular surface, thereby clamping the oil pipe. When the oil pipe is pushed upward, since the end of the clamping block away from the oil pipe clamping space is adapted to the inner annular surface of the clamping ring, the clamping block is narrow at the top and wide at the bottom, and the higher the oil pipe is pushed, the tighter the multiple clamping blocks clamp, thereby achieving a self-tightening effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0029] Figure 2 is a schematic cross-sectional diagram of the overall structure of an embodiment of the present application;

[0030] Figure 3 It is a structural schematic diagram of some structures in the embodiments of the present application.

[0031] Figure numerals: 1. mounting seat; 11. positioning rod; 2. clamping block; 21. connecting seat; 3. clamping ring; 4. control ring; 5. driving assembly; 51. motor; 52. driving wheel; 53. bevel gear; 6. guide assembly; 61. mounting plate; 62. guide rod; 63. spring; 64. slide rail; 7. bearing; 8. protective cover. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0033] It should be noted that the terms "including" and "having" and any variations thereof in the specification and claims of the present application and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, apparatus, product or equipment comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0034] The following is combined with Figure 1-3 This application is further described in detail.

[0035] Reference Figure 1-2 A spiral self-tightening oil pipe anti-lifting slip comprises: a mounting seat 1, a plurality of clamping mechanisms, a clamping ring 3 and a driving mechanism. The clamping mechanism comprises a clamping block 2, which is slidably arranged on the mounting seat 1. The plurality of clamping blocks 2 are distributed in a circumference. There is an oil pipe clamping space between the plurality of clamping blocks 2. The clamping block 2 is provided with anti-slip stripes on one side close to the oil pipe clamping space. The inner ring surface of the clamping ring 3 is a conical surface (wherein the opening at the bottom of the inner ring surface of the clamping ring 2 is larger than the top). The clamping ring 3 is sleeved on the plurality of clamping blocks 2 from top to bottom. One end of the plurality of clamping blocks 2 away from the oil pipe clamping space is adapted to the inner ring surface of the clamping ring 3. The end face of block 2 away from the oil pipe clamping space is a part of the conical surface (the clamping block 2 is wider at the bottom and narrower at the top as a whole); the driving mechanism is used to drive the clamping ring 3 to perform lifting and lowering movements; in this way, when the clamping ring 3 moves downward, the inner side face of the clamping ring 3 abuts against multiple clamping blocks 2, causing multiple clamping blocks 2 to move synchronously to one side of the oil pipe clamping space until the ends of multiple clamping blocks 2 abut against the oil pipe annular surface, thereby clamping the oil pipe. When the oil pipe is pushed upward, since the end of the clamping block 2 away from the oil pipe clamping space is adapted to the inner annular surface of the clamping ring 3, the clamping block 2 is narrow at the top and wide at the bottom, and the higher the oil pipe is pushed, the tighter the clamping block 2 clamps, thereby achieving a self-tightening effect.

[0036] Reference Figure 2-3The driving mechanism includes a control ring 4 and a driving assembly 5 for driving the control ring 4 to rotate. The control ring 4 is rotatably arranged on the mounting seat 1. The inner ring surface of the control ring 4 and the outer ring surface of the clamping ring 3 are both provided with threads. The control ring 4 is threadedly connected with the clamping ring 3. A positioning rod 11 is vertically arranged on the mounting seat 1. A positioning hole is opened on the clamping ring 3, and the positioning rod 11 is sleeved through the positioning hole. The driving assembly 5 includes a motor 51, a driving wheel 52 and a bevel gear 53. The motor 51 is placed on the mounting seat 1. The driving wheel 52 is also provided on the mounting seat 1. The shaft is arranged at the output end of the motor 51, the bevel gear 53 is arranged on the mounting seat 1, and the outer ring surface of the control ring 4 is provided with a rack adapted to the bevel gear 53, and the bevel gear 53 is meshed with the driving wheel 52 and the clamping ring 3. In this way, the motor 51 is used to rotate the driving wheel 52, so that the bevel gear 53 rotates, and then the control ring 4 rotates, so that the driving clamping ring 3 is driven to perform lifting and lowering movements (because the clamping ring 3 is restricted by the positioning rod 11, the clamping ring 3 can only move axially along the positioning rod 11), thereby achieving the synchronous movement of multiple clamping blocks 2.

[0037] Reference Figure 2 The clamping mechanism also includes a guide assembly 6, which includes a mounting plate 61, two guide rods 62 and a slide rail 64 arranged on the mounting seat 1. The slide rail 64 is arranged on the mounting seat 1, and the two guide rods 62 are horizontally arranged on the mounting plate 61. A connecting seat 21 is arranged at the bottom end of the clamping block 2, and the connecting seat 21 is slidably arranged on the slide rail 64. The two guide rods 62 are penetrated on the connecting seat 21. In this way, the two guide rods 62 and the slide rail 64 are used to guide the movement of the connecting seat 21, so that the clamping block 2 moves along the axial direction of the two guide rods 62 and the extension direction of the slide rail 64, so that the oil pipe is clamped accurately.

[0038] Reference Figure 2 A spring 63 is sleeved on the guide rod 62, one end of the spring 63 is connected to the guide rod 62, and the other end is connected to the connecting seat 21. In this way, the spring 63 is placed on the guide rod 62. When the clamping block 2 clamps the oil pipe, the connecting seat 21 compresses the spring 63. When the clamping ring 3 moves upward, the elastic force of the spring 63 resets the connecting seat 21 and the clamping block 2.

[0039] Reference Figure 2 , bearings 7 are provided on the plurality of mounting plates 61, and the control ring 4 is provided on the bearing 7, so that the control ring 4 is connected to the mounting seat 1 through the bearing 7, so that the friction of the control ring 4 when rotating is reduced, and the rotation is smoother.

[0040] In a specific possible implementation manner, three clamping mechanisms are provided, so that the oil pipe is clamped by three clamping blocks 2 .

[0041] Reference Figure 1A protective cover 8 is provided above the mounting seat 1 , and the protective cover 8 is sleeved on the outer side of the control ring 4 . Thus, by providing the protective cover 8 , the structure inside the protective cover 8 is protected.

[0042] In summary: by setting a clamping ring 3, when the driving mechanism drives the clamping ring 3 to move downward, the inner side surface of the clamping ring 3 abuts against the multiple clamping blocks 2, so that the multiple clamping blocks 2 move synchronously to one side of the oil pipe clamping space until the ends of the multiple clamping blocks 2 abut against the oil pipe annular surface, so that the oil pipe is clamped. When the oil pipe is pushed upward, since the end of the clamping block 2 away from the oil pipe clamping space is adapted to the inner annular surface of the clamping ring 3 (conical surface contact), the clamping block 2 is narrow at the top and wide at the bottom. The higher the oil pipe is pushed, the tighter the multiple clamping blocks 2 clamp, thereby playing a self-tightening role.

[0043] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A spiral self-tightening oil pipe anti-lifting slip, characterized in that: include: A mounting seat (1), a plurality of clamping mechanisms, a clamping ring (3) and a driving mechanism, wherein the clamping mechanism comprises a clamping block (2), the clamping block (2) is slidably arranged on the mounting seat (1), the plurality of clamping blocks (2) are distributed in a circular pattern, and a tubing clamping space is provided between the plurality of clamping blocks (2); The inner ring surface of the clamping ring (3) is a conical surface. The clamping ring (3) is sleeved on a plurality of clamping blocks (2) from top to bottom. The ends of the plurality of clamping blocks (2) away from the oil pipe clamping space are adapted to the inner ring surface of the clamping ring (3). The driving mechanism is used to drive the clamping ring (3) to perform lifting motion; When the clamping ring (3) moves downward, the inner side surface of the clamping ring (3) contacts the plurality of clamping blocks (2), causing the plurality of clamping blocks (2) to move synchronously toward one side of the oil pipe clamping space.

2. The spiral self-tightening oil pipe anti-lifting slip according to claim 1, characterized in that: The driving mechanism comprises a control ring (4) and a driving assembly (5) for driving the control ring (4) to rotate; the control ring (4) is rotatably arranged on a mounting seat (1); the inner ring surface of the control ring (4) and the outer ring surface of the clamping ring (3) are both provided with threads; the control ring (4) and the clamping ring (3) are threadedly connected; a positioning rod (11) is vertically arranged on the mounting seat (1); a positioning hole is provided on the clamping ring (3), and the clamping ring (3) is sleeved on the positioning rod (11) through the positioning hole.

3. The spiral self-tightening oil pipe anti-lifting slip according to claim 2, characterized in that: The driving assembly (5) comprises a motor (51), a driving wheel (52) and a bevel gear (53); the motor (51) is placed on a mounting seat (1); the driving wheel (52) is coaxially arranged at the output end of the motor (51); the bevel gear (53) is arranged on the mounting seat (1); a rack matched with the bevel gear (53) is arranged on the outer ring surface of the control ring (4); and the bevel gear (53) is meshed with the driving wheel (52) and the clamping ring (3).

4. The spiral self-tightening oil pipe anti-lifting slip according to claim 2, characterized in that: The clamping mechanism further comprises a guide assembly (6), the guide assembly (6) comprising a mounting plate (61) arranged on the mounting seat (1) and two guide rods (62), the two guide rods (62) being horizontally arranged on the mounting plate (61), a connecting seat (21) being arranged at the bottom end of the clamping block (2), and the two guide rods (62) being passed through the connecting seat (21).

5. The spiral self-tightening oil pipe anti-lifting slip according to claim 4, characterized in that: The guide rods (62) are sleeved with springs (63), one end of the springs (63) is connected to the guide rods (62), and the other end is connected to the connecting seat (21).

6. The spiral self-tightening oil pipe anti-lifting slip according to claim 4, characterized in that: The guide assembly (6) further comprises a slide rail (64), wherein the slide rail (64) is arranged on the mounting seat (1), and the connecting seat (21) is slidably arranged on the slide rail (64).

7. The spiral self-tightening oil pipe anti-lifting slip according to claim 4, characterized in that: Bearings (7) are arranged on the plurality of mounting plates (61), and the control ring (4) is arranged on the bearings (7).

8. The spiral self-tightening oil pipe anti-lifting slip according to claim 1, characterized in that: The clamping mechanisms are provided in three numbers.

9. The spiral self-tightening oil pipe anti-lifting slip according to claim 1, characterized in that: The clamping block (2) is provided with anti-slip stripes on one side close to the oil pipe clamping space.

10. The spiral self-tightening oil pipe anti-lifting slip according to claim 2, characterized in that: A protective sleeve (8) is arranged above the mounting seat (1), and the protective sleeve (8) is sleeved on the outside of the control ring (4).

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