Tool for preventing tubular column from falling into well

Abstract

The utility model discloses a tool for preventing a tubular column from falling into a well, which comprises an upper joint, a connecting rod is fixedly arranged on one side of the surface of the upper joint, a slip bowl is movably sleeved on the outer side surface of the connecting rod, a plurality of slips are uniformly and fixedly arranged on the outer side surface of the slip bowl, and an anti-abrasion sleeve is arranged between the outer side surface of the connecting rod and the slip bowl. A reset spring is arranged on the outer side of the anti-abrasion sleeve on the surface of the connecting rod in a sleeving mode, a cap is fixedly arranged on the outer side surface of the slip bowl, a middle connector is fixedly arranged at the end, away from the upper connector, of the connecting rod, an outer cylinder is fixedly arranged on the side, away from the connecting rod, of the middle connector, and a counterweight steel block is movably arranged in the outer cylinder in a clamped mode. And a transmission rod is fixedly arranged on the surface of one side, close to the cap, of the counterweight steel block. Once weightlessness occurs, the device can be automatically clamped in a well, in this way, automatic emergency braking can be achieved, and a pipe column is prevented from falling into a highly-deviated well section or a highly-deviated horizontal section.

Description

Technical Field

[0001] The utility model relates to the technical field of tools for preventing a pipe from falling into a well, in particular to a tool for preventing a pipe column from falling into a well. Background Art

[0002] With the rapid development of oilfield mining technology, there are more and more horizontal wells and highly deviated wells. Since it is difficult to overhaul horizontal wells and highly deviated wells in highly deviated sections, the requirements for preventing the pipe from falling into the well are getting higher and higher.

[0003] Therefore, in the production tubing of highly deviated wells and horizontal wells, emergency braking is required when the tubing breaks off to prevent the tubing from falling into the highly deviated well section or the horizontal section, causing complex overhaul. Therefore, a tool to prevent the tubing from falling into the well is needed to improve this problem. Utility Model Content

[0004] The utility model aims to provide a tool for preventing a pipe column from falling into a well, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a tool for preventing a pipe column from falling into a well, comprising an upper joint, a connecting rod is fixedly provided on one side of the surface of the upper joint, a slip seat is movably provided on the outer surface of the connecting rod, a plurality of slips are evenly and fixedly provided on the outer surface of the slip seat, an anti-wear sleeve is provided between the outer surface of the connecting rod and the slip seat, a reset spring is provided on the surface of the connecting rod on the outer side of the anti-wear sleeve, a cap is fixedly provided on the outer surface of the slip seat, an intermediate joint is fixedly provided on one end of the connecting rod away from the upper joint, an outer cylinder is fixedly provided on the side of the intermediate joint away from the connecting rod, a counterweight steel block is movably engaged with the inside of the outer cylinder, a transmission rod is fixedly provided on the side surface of the counterweight steel block close to the cap, a hydraulic piston is movably engaged with the lower end of the inner part of the outer cylinder, and a counterweight spring is provided between the hydraulic piston and the counterweight steel block in the inner part of the outer cylinder.

[0006] Preferably, a lower joint is fixedly provided at the lower end of the outer tube, and the overall sealing of the outer tube can be ensured by the lower joint.

[0007] Preferably, hydraulic shielding shear nails are fixedly arranged between the outer tube and the lower joint; the outer tube and the lower joint can be fixedly connected together through the hydraulic shielding shear nails.

[0008] Preferably, a plurality of straightening balls are movably engaged on the outer surface of the counterweight steel block, and the straightening balls can reduce the friction between the outer surface of the counterweight steel block and the inner side wall of the outer tube, so as to facilitate the counterweight spring to push the counterweight steel block upward along the outer tube.

[0009] Preferably, a plurality of serrations are evenly and fixedly provided on the outer surface of the slip, and the serrations can improve the stability of the slip in the well, thereby improving the automatic emergency braking effect.

[0010] Preferably, a through groove is provided on the outer surface of the intermediate joint, and the transmission rod is inserted through the through groove and extends to the outside of the outer cylinder and contacts with the outer surface of the cap.

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

[0012] 1. When the pipe string suddenly breaks off, the counterweight block inside the outer tube of the utility model loses weight, and at the same time, the lower end of the outer tube is hydraulically impacted. Due to the weightless counterweight steel block counterweight spring no longer needs to overcome the gravity of the counterweight steel block, so the counterweight spring can instantly push the counterweight steel block upward, and transmit the thrust to the cap, the slip seat, and the slip to move toward the upper joint through the transmission rod. The cross-section of the upper joint is a cone. When the slip seat and the slip move toward the upper joint, the slip of the elastic metal material is forced to open to the surroundings, so that the slip with multiple serrations on the surface can be tensioned and fixed in the well, so that automatic emergency braking can be achieved to prevent the pipe string from falling into a high-angle well section or a horizontal section, and the broken pipe string can be emergency braked to prevent the pipe string from falling into a high-angle well section or a horizontal section.

[0013] 2. When the broken pipe column is lifted up after salvage, the weight steel block recovers its gravity and moves downward under the action of gravity. The reset spring is no longer squeezed by the elastic force of the weight spring, so the slip seat is pushed to drive the slip back. At the same time, the reset spring forces the weight block to return to its original position through the cap transmission rod, and the tool returns to its initial state, so it can be easily lifted. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the overall structure of a tool for preventing a pipe column from falling into a well according to the utility model;

[0015] Figure 2 This is an overall structural view of an upper joint in a tool for preventing a pipe column from falling into a well according to the utility model;

[0016] Figure 3 The utility model is a view of the overall structure of the slips in a tool for preventing a pipe column from falling into a well.

[0017] In the figure: 1. upper joint; 2. connecting rod; 3. slip; 4. slip seat; 5. anti-wear sleeve; 6. reset spring; 7. cap; 8. middle joint; 9. transmission rod; 10. outer cylinder; 11. counterweight steel block; 12. straightening ball; 13. counterweight spring; 14. hydraulic piston; 15. hydraulic shielding shear pin; 16. lower joint; 17. sawtooth. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] See also Figure 1-3 The utility model provides a technical solution: a tool for preventing a pipe column from falling into a well, comprising an upper joint 1, a connecting rod 2 is fixedly arranged on one side of the surface of the upper joint 1, a slip seat 4 is movably sleeved on the outer surface of the connecting rod 2, a plurality of slips 3 are evenly and fixedly arranged on the outer surface of the slip seat 4, an anti-wear sleeve 5 is arranged between the outer surface of the connecting rod 2 and the slip seat 4, a reset spring 6 is sleeved on the outer side of the anti-wear sleeve 5 on the surface of the connecting rod 2, a cap 7 is fixedly arranged on the outer surface of the slip seat 4, an intermediate joint 8 is fixedly arranged on the end of the connecting rod 2 away from the upper joint 1, an outer cylinder 10 is fixedly arranged on the side of the intermediate joint 8 away from the connecting rod 2, a counterweight steel block 11 is movably engaged inside the outer cylinder 10, a transmission rod 9 is fixedly arranged on the side of the counterweight steel block 11 close to the cap 7, a hydraulic piston 14 is movably engaged inside the lower end of the outer cylinder 10, and a counterweight spring 13 is arranged between the hydraulic piston 14 and the counterweight steel block 11 inside the outer cylinder 10.

[0020] The lower end of the outer tube 10 is fixedly provided with a lower joint 16, through which the overall sealing of the outer tube 10 can be ensured;

[0021] A hydraulic shielding shear nail 15 is fixedly arranged between the outer cylinder 10 and the lower joint 16; the outer cylinder 10 and the lower joint 16 can be fixedly connected together by the hydraulic shielding shear nail 15;

[0022] The outer surface of the counterweight steel block 11 is movably engaged with a plurality of straightening balls 12, which can reduce the friction between the outer surface of the counterweight steel block 11 and the inner side wall of the outer cylinder 10, so as to facilitate the counterweight spring 13 to push the counterweight steel block 11 to move up along the outer cylinder 10;

[0023] The outer surface of the slip 3 is evenly and fixedly provided with a plurality of saw teeth 17, and the saw teeth 17 can improve the stability of the slip 3 in the well, thereby improving the automatic emergency braking effect;

[0024] The outer surface of the intermediate joint 8 is provided with a through groove, and the transmission rod 9 is inserted through the through groove and extends to the outside of the outer tube 10, and contacts with the outer surface of the cap 7; the cap 7, the slip seat 4, and the slip 3 can be pushed by the transmission rod 9 to move in the direction close to the upper joint 1, and the cross section of the upper joint 1 is a cone. When the slip seat 4 and the slip 3 move in the direction close to the upper joint 1, the slip 3 made of elastic metal material will be forced to open to the surroundings, so that the slip 3 with a plurality of saw teeth 17 on the surface can be tensioned and fixed in the well, so that automatic emergency braking can be performed to prevent the pipe string from falling into a high-angle well section or a horizontal section; and when taking out the device, the device is lifted up by pulling the upper joint 1 part, and the slip 3 can be reset by the friction with the well wall and the action of the reset spring 6, and the tool can be restored to the initial state, so that the device can be easily lifted up;

[0025] Working principle: When the device is used, it is fixed at the lower end of the pipe column. When the pipe column is suddenly disconnected, the counterweight block inside the outer tube 10 of the device loses weight, and at the same time, the hydraulic impact at the lower end of the outer tube 10 causes the counterweight steel block 11 to lose weight and the counterweight spring 13 no longer needs to overcome the gravity of the counterweight steel block 11. In this way, the counterweight spring 13 can instantly push the counterweight steel block 11 upward, and transmit the thrust to the cap 7, the slip seat 4, and the slip 3 through the transmission rod 9 to move in the direction close to the upper joint 1. The cross section of the upper joint 1 is a cone. When the slip seat 4 and the slip 3 move in the direction close to the upper joint 1, the elastic metal material is forced to move upward. The slip 3 opens to all sides, so that the slip 3 with multiple saw teeth 17 on the surface can be tensioned and fixed in the well, so that automatic emergency braking can be performed to prevent the pipe string from falling into a high-angle well section or a horizontal section, and emergency braking can be performed on the broken pipe string to prevent the pipe string from falling into a high-angle well section or a horizontal section. When the broken pipe string is salvaged and lifted up, the gravity of the counterweight steel block 11 is restored and it moves downward under the action of gravity. The reset spring 6 is no longer squeezed by the elastic force of the counterweight spring 13, so the slip seat 4 is pushed to drive the slip 3 to return. At the same time, the reset spring 6 forces the counterweight block to return through the cap 7 transmission rod 9, and the tool is restored to its initial state, so it can be easily lifted.

[0026] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A tool for preventing a pipe column from falling into a well, comprising an upper joint (1), characterized in that: A connecting rod (2) is fixedly provided on one side of the surface of the upper joint (1); a slip seat (4) is movably provided on the outer surface of the connecting rod (2); a plurality of slips (3) are evenly and fixedly provided on the outer surface of the slip seat (4); an anti-wear sleeve (5) is provided between the outer surface of the connecting rod (2) and the slip seat (4); a return spring (6) is provided on the surface of the connecting rod (2) outside the anti-wear sleeve (5); a parallel cap (7) is fixedly provided on the outer surface of the slip seat (4); and the connecting rod (2) is away from the upper joint (1). An intermediate joint (8) is fixedly provided at one end, an outer cylinder (10) is fixedly provided on the side of the intermediate joint (8) away from the connecting rod (2), a counterweight steel block (11) is movably engaged inside the outer cylinder (10), a transmission rod (9) is fixedly provided on the surface of the counterweight steel block (11) close to the cap (7), a hydraulic piston (14) is movably engaged at the lower end of the inner part of the outer cylinder (10), and a counterweight spring (13) is provided inside the outer cylinder (10) between the hydraulic piston (14) and the counterweight steel block (11).

2. A tool for preventing a pipe column from falling into a well according to claim 1, characterized in that: A lower joint (16) is fixedly provided at the lower end of the outer cylinder (10).

3. A tool for preventing a pipe column from falling into a well according to claim 2, characterized in that: A hydraulic shielding shear nail (15) is fixedly arranged between the outer cylinder (10) and the lower joint (16).

4. A tool for preventing a pipe column from falling into a well according to claim 1, characterized in that: A plurality of straightening balls (12) are movably engaged on the outer surface of the counterweight steel block (11).

5. A tool for preventing a pipe column from falling into a well according to claim 1, characterized in that: A plurality of saw teeth (17) are evenly and fixedly arranged on the outer surface of the slip (3).

6. A tool for preventing a pipe column from falling into a well according to claim 1, characterized in that: The outer surface of the intermediate joint (8) is provided with a through groove, and the transmission rod (9) is inserted through the through groove and extends to the outside of the outer cylinder (10) and contacts the outer surface of the cap (7).

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