A tubing liner puller

Abstract

This utility model discloses a tubing liner pulling tool, including a lead screw, a pull ring, and a pulling mechanism. The claw unit is a cylindrical structure, and the inner diameter of the claw unit is larger than the outer diameter of the lead screw. The claw unit includes a front claw body and a rear claw body, with the rear claw body positioned near the pull ring. The front and rear claw bodies are in close contact, and their contact surfaces are inclined. The angle between the contact surfaces and the central axis of the lead screw is 45°. This utility model utilizes a force transmission component to allow the inclined contact surfaces of the front and rear claw bodies to move relative to each other after being subjected to force. The front and rear arc-shaped claws easily cut into the inner wall of the tubing liner until they reach the outer wall. Simultaneously, because the contact surfaces of the front and rear claw bodies are inclined, the contact surfaces between the front and rear arc-shaped claws and the liner tube are not on the same axial section after cutting into the tubing liner, increasing the tensile strength of the liner tube and facilitating its removal.

Description

Technical Field

[0001] This utility model belongs to the technical field of oilfield equipment maintenance devices, and in particular relates to a tubing lining pull-out tool. Background Technology

[0002] The inner lining of the tubing involves inserting a high-molecular-weight polyethylene plastic tube into the inner hole of a steel tubing to achieve corrosion prevention, scale prevention, and anti-abrasion in oil wells. However, after a certain period of use, the inner lining needs to be replaced. How to pull out the inner lining is a problem because the inner lining tube is tightly attached to the inner wall of the tubing. At this time, it is difficult to pull it out using traditional pulling tools because the outer part of the inner lining is a steel tube. When the slip of the pulling tool gets stuck on the inner wall of the inner lining tube, it also makes the inner lining stick tightly to the steel tube, increasing the friction during pulling and resulting in poor performance. To address this issue, a new type of tool has been designed to effectively solve this problem. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide an oil pipe liner pulling tool to address the shortcomings of the prior art. By utilizing a force transmission component, the inclined contact surfaces of the front and rear claws move relative to each other after being subjected to force, allowing the front and rear arc-shaped claws to easily cut into the inner wall of the oil pipe liner until reaching the outer wall. At the same time, since the contact surfaces of the front and rear claws are inclined, the contact surfaces of the front and rear arc-shaped claws with the liner tube after cutting into the oil pipe liner are not on the same axial section, which increases the tensile strength of the liner tube and facilitates the pulling out of the oil pipe liner tube.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: an oil pipe liner pulling tool, including a lead screw, a pull ring disposed at one end of the lead screw, and a pulling mechanism disposed at the other end of the lead screw;

[0005] The pulling mechanism includes a claw unit sleeved on the lead screw. A force transmission component is provided at one end of the claw unit near the pull ring, and a limit component is provided at the other end of the claw unit away from the pull ring.

[0006] The claw unit is a cylindrical structure, and the inner diameter of the claw unit is larger than the outer diameter of the lead screw. The claw unit includes a front claw and a rear claw that are sequentially sleeved on the lead screw. The rear claw is located at one end near the pull ring. The front claw and the rear claw are in close contact, and the contact surface of the front claw and the rear claw is an inclined surface. The angle between the contact surface and the central axis of the lead screw is 45°.

[0007] The front claw body has a front arc-shaped claw at its bottom, which is located at one end of the front claw body near the contact surface; the rear claw body has a rear arc-shaped claw at its top, which is located at one end of the rear claw body near the contact surface; the longitudinal section of both the front arc-shaped claw and the rear arc-shaped claw is triangular.

[0008] The force transmission component includes a spacer sleeved on the lead screw, the spacer sleeve being disposed between the rear claw body and the pull ring, a first washer being disposed between the spacer sleeve and the rear claw body, a first clamping nut being disposed at the end of the spacer sleeve away from the rear claw body, and a second washer being disposed between the spacer sleeve and the first clamping nut.

[0009] Furthermore, the pull ring is mounted on the end of the lead screw via a first locking nut.

[0010] Furthermore, the hypotenuse of the front arc-shaped claw is in close contact with the outer surface of the front claw body, and the hypotenuse of the rear arc-shaped claw is in close contact with the outer surface of the rear claw body; the outer diameter of the arc where the vertex of the front arc-shaped claw is located is smaller than the inner diameter of the oil pipe liner, and the outer diameter of the arc where the apex of the rear arc-shaped claw is located is smaller than the inner diameter of the oil pipe liner.

[0011] Furthermore, the limiting component includes a second clamping nut disposed at the end of the front claw body away from the rear claw body, a third washer disposed between the second clamping nut and the front claw body, and a second locking nut disposed at the end of the second clamping nut away from the front claw body.

[0012] This utility model has the following advantages compared with the prior art:

[0013] 1. This utility model utilizes a force transmission component to enable the inclined contact surfaces of the front and rear claws to move relative to each other after being subjected to force. The front and rear arc-shaped claws easily cut into the inner wall of the oil pipe liner until they reach the outer wall. At the same time, since the contact surfaces of the front and rear claws are inclined, the contact surfaces of the front and rear arc-shaped claws with the inner liner after cutting into the oil pipe liner are not on the same axial section, which increases the tensile strength of the inner liner and makes it easier to pull out the oil pipe liner.

[0014] 2. This utility model utilizes the spacer in the force transmission component to allow the pulling tool to extend a certain distance into the inner liner of the oil pipe, thereby increasing the usable length of the pulling tool.

[0015] In summary, this utility model utilizes a force transmission component to enable the inclined contact surfaces of the front and rear claws to move relative to each other after being subjected to force. The front and rear arc-shaped claws easily cut into the inner wall of the oil pipe liner until they reach the outer wall. At the same time, since the contact surfaces of the front and rear claws are inclined, the contact surfaces of the front and rear arc-shaped claws with the inner liner after cutting into the oil pipe liner are not on the same axial section, which increases the tensile strength of the inner liner and makes it easier to pull out the oil pipe liner.

[0016] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] Figure 2 for Figure 1 AA sectional view.

[0019] Explanation of reference numerals in the attached figures:

[0020] 1—Second locking nut; 2—Second clamping nut; 3—Third washer;

[0021] 4—Foreleg body; 5—Rear curved claw; 6—Rear claw body;

[0022] 7—Front arc-shaped claw; 8—First washer; 9—Spacer;

[0023] 10—Second washer; 11—First clamping nut; 12—Lead screw;

[0024] 13—First locking nut; 14—Pull ring. Detailed Implementation

[0025] like Figure 1 and Figure 2 As shown, this utility model includes a lead screw 12, a pull ring 14 disposed at one end of the lead screw 12, and a pulling mechanism disposed at the other end of the lead screw 12.

[0026] The pulling mechanism includes a claw unit sleeved on the lead screw 12. A force transmission component is provided at one end of the claw unit near the pull ring 14, and a limit component is provided at the other end of the claw unit away from the pull ring 14.

[0027] The claw unit is a cylindrical structure, and the inner diameter of the claw unit is larger than the outer diameter of the lead screw 12. The claw unit includes a front claw 4 and a rear claw 6 sequentially sleeved on the lead screw 12. The rear claw 6 is located at one end close to the pull ring 14. The front claw 4 and the rear claw 6 are in close contact, and the contact surface of the front claw 4 and the rear claw 6 is an inclined surface. The angle between the contact surface and the central axis of the lead screw 12 is 45°.

[0028] The front claw body 4 is provided with a front arc-shaped claw 7 at its bottom, and the front arc-shaped claw 7 is arranged at one end of the front claw body 4 near the contact surface; the rear claw body 6 is provided with a rear arc-shaped claw 5 at its top, and the rear arc-shaped claw 5 is arranged at one end of the rear claw body 6 near the contact surface; the longitudinal section of both the front arc-shaped claw 7 and the rear arc-shaped claw 5 is triangular.

[0029] The force transmission component includes a spacer 9 sleeved on the lead screw 12. The spacer 9 is arranged between the rear claw body 6 and the pull ring 14. A first washer 8 is provided between the spacer 9 and the rear claw body 6. A first clamping nut 11 is provided at the end of the spacer 9 away from the rear claw body 6. A second washer 10 is provided between the spacer 9 and the first clamping nut 11.

[0030] In actual use, by utilizing the force transmission component, the inclined contact surfaces of the front claw body 4 and the rear claw body 6 move relative to each other after being subjected to force. The front arc-shaped claw 7 and the rear arc-shaped claw 5 easily cut into the inner wall of the oil pipe liner until they reach the outer wall. At the same time, since the contact surfaces of the front claw body 4 and the rear claw body 6 are inclined, the contact surfaces of the front arc-shaped claw 7 and the rear arc-shaped claw 5 with the inner liner tube after cutting into the oil pipe liner tube are not on the same axial section, which increases the tensile strength of the inner liner tube and makes it easier to pull out the inner liner tube of the oil pipe.

[0031] The spacer 9 in the force transmission component allows the pulling tool to extend a certain distance into the inner liner of the oil pipe, thus extending the working length of the pulling tool.

[0032] It should be noted that during the pulling process of the tubing liner, the first clamping nut 11 cannot enter the hole of the tubing liner; that is, the first clamping nut 11 needs to be placed outside the tubing. All parts are connected together using a lead screw 12. The core components of this tool are the front jaw body 4 and the rear jaw body 6. The front jaw body 4 and the rear jaw body 6 are formed by splitting a thick-walled circular tube in the middle, with the split surface at a 45-degree angle to the axis. Simultaneously, the front jaw body 4 and the rear jaw body 6 can move relative to each other along the split inclined surface. A pull ring 14 is connected to the tail of the lead screw 12 for easy connection of a tension rod or other soft pull rope. A front arc-shaped jaw 7 is welded onto the front jaw body 4, and a rear arc-shaped jaw 5 is welded onto the rear jaw body 6. The arc-shaped jaws are welded together and then ground into a triangular shape with a sharp outer edge using a grinder; for example... Figure 2 As shown, the curved claws have only a small section on their respective claw bodies.

[0033] like Figure 1 As shown, in this embodiment, the pull ring 14 is installed at the end of the lead screw 12 via the first locking nut 13.

[0034] like Figure 1 and Figure 2As shown, in this embodiment, the hypotenuse of the front arc-shaped claw 7 is in close contact with the outer surface of the front claw body 4, and the hypotenuse of the rear arc-shaped claw 5 is in close contact with the outer surface of the rear claw body 6; the outer diameter of the arc where the vertex of the front arc-shaped claw 7 is located is smaller than the inner diameter of the oil pipe liner, and the outer diameter of the arc where the apex of the rear arc-shaped claw 5 is located is smaller than the inner diameter of the oil pipe liner.

[0035] like Figure 1 As shown, in this embodiment, the limiting component includes a second clamping nut 2 disposed at the end of the front claw body 4 away from the rear claw body 6, a third washer 3 disposed between the second clamping nut 2 and the front claw body 4, and a second locking nut 1 disposed at the end of the second clamping nut 2 away from the front claw body 4.

[0036] In use, after inserting the pulling tool into the hole of the tubing liner, the first clamping nut 11 is adjusted with an open-end wrench. The axial force generated by the first clamping nut 11 is first transmitted to the spacer 9, then to the first washer 8, and finally to the rear claw body 6. Due to the limitation of the front claw body 4 by the limiting component, the rear claw body 6 and the front claw body 4 open to both sides along the inclined plane. At this time, the front arc-shaped claw 7 and the rear arc-shaped claw 5 cut into the tubing liner under the radial component force generated by the inclined plane. As the displacement further increases until the front arc-shaped claw 7 and the rear arc-shaped claw 5 can no longer move, the first clamping nut 11 is loosened slightly by one turn to ensure that the front arc-shaped claw 7 and the rear arc-shaped claw 5 do not contact the steel tubing. Finally, the tubing liner can be pulled out of the tubing by connecting it to the pull ring 14 with a tractor or traction device.

[0037] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the present utility model. Any simple modifications, alterations, or equivalent structural changes made to the above embodiments based on the technical essence of the present utility model shall still fall within the protection scope of the present utility model.

Claims

1. A tubing liner puller tool, characterized by: It includes a lead screw (12), a pull ring (14) disposed at one end of the lead screw (12), and a pulling mechanism disposed at the other end of the lead screw (12); The pulling mechanism includes a claw unit sleeved on the lead screw (12), a force transmission component is provided at one end of the claw unit near the pull ring (14), and a limit component is provided at the other end of the claw unit away from the pull ring (14); The claw unit is a cylindrical structure, and the inner diameter of the claw unit is larger than the outer diameter of the lead screw (12). The claw unit includes a front claw (4) and a rear claw (6) sequentially sleeved on the lead screw (12). The rear claw (6) is located at one end close to the pull ring (14). The front claw (4) and the rear claw (6) are in close contact, and the contact surface of the front claw (4) and the rear claw (6) is an inclined surface. The angle between the contact surface and the central axis of the lead screw (12) is 45°. The front claw body (4) is provided with a front arc-shaped claw (7) at the bottom, and the front arc-shaped claw (7) is arranged at one end of the front claw body (4) near the contact surface; the rear claw body (6) is provided with a rear arc-shaped claw (5) at the top, and the rear arc-shaped claw (5) is arranged at one end of the rear claw body (6) near the contact surface; the longitudinal section of both the front arc-shaped claw (7) and the rear arc-shaped claw (5) is triangular. The force transmission component includes a spacer (9) sleeved on the lead screw (12), the spacer (9) being arranged between the rear claw body (6) and the pull ring (14), a first washer (8) being provided between the spacer (9) and the rear claw body (6), a first clamping nut (11) being provided at the end of the spacer (9) away from the rear claw body (6), and a second washer (10) being provided between the spacer (9) and the first clamping nut (11).

2. A tubing liner pull tool as defined in claim 1, wherein: The pull ring (14) is mounted on the end of the lead screw (12) by a first locking nut (13).

3. A tubing liner pull tool as defined in claim 1, wherein: The hypotenuse of the front arc-shaped claw (7) is in close contact with the outer surface of the front claw body (4), and the hypotenuse of the rear arc-shaped claw (5) is in close contact with the outer surface of the rear claw body (6); the outer diameter of the arc where the vertex of the front arc-shaped claw (7) is located is smaller than the inner diameter of the oil pipe liner, and the outer diameter of the arc where the apex of the rear arc-shaped claw (5) is located is smaller than the inner diameter of the oil pipe liner.

4. The tubing liner pull tool of claim 1, wherein: The limiting component includes a second clamping nut (2) disposed at the end of the front claw body (4) away from the rear claw body (6), a third washer (3) disposed between the second clamping nut (2) and the front claw body (4), and a second locking nut (1) disposed at the end of the second clamping nut (2) away from the front claw body (4).

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