Limiter for testing fishing outer hook of steel wire rope

Abstract

The invention discloses a limiter for testing a fishing outer hook of a steel wire rope, and belongs to the technical field of fishing tools for testing the steel wire rope in the petroleum industry, the tool is a limiter for testing the fishing outer hook of the steel wire rope, the limiter comprises a central rod body, a first limiting part and a second limiting part, the central rod body is arranged along an axis O, and the first limiting part and the second limiting part are respectively arranged in the axial direction; the moving structure is assembled on the central rod body and is configured to linearly move in the axial direction; each arm body structure comprises a first arm body component and a second arm body component; and an elastic member. By means of the positioning assembly arranged on the center rod body and the supporting effect of the elastic component on the arm body structure, the arm body structure can adapt to different hole diameter changes in a shaft, the probability of resistance caused by deformation of a pipe column in a well is reduced, meanwhile, the arm body structure can be tightly supported on the inner wall of the pipe column, the fishing tool is centered, and the fishing effect is improved. The contact probability of the barbs and the steel wire is increased, and then the fishing success rate is increased.

Description

Technical Field

[0001] The invention belongs to the technical field of testing wire rope fishing tools in the petroleum industry, and particularly relates to an outer hook limiter for testing wire rope fishing. Background Art

[0002] During the exploitation of oil and gas fields, it is necessary to use wires or cables to lower instruments for downhole data acquisition; during the process of lowering or lifting, there is a situation where the wire or cable breaks in the middle; the wire or cable broken in the middle needs to be fished by a conventional fishing spear.

[0003] During the process of lowering the existing conventional fishing spear, especially when touching the fallen wire or cable in the well, the main body of the fishing spear is not always in a concentric state with the oil pipe, and the end of the wire may pass through the side of the conventional fishing spear, greatly reducing the success rate of fishing the downhole wire or cable. Summary of the Invention

[0004] The purpose of the invention is to provide an outer hook limiter for testing wire rope fishing to solve the problems in the use of fishing tools mentioned in the above background art.

[0005] To achieve the above purpose, the invention provides the following technical solution: An outer hook limiter for testing wire rope fishing, comprising:

[0006] A central rod body, arranged along the axis O, and respectively provided with a first limiting part and a second limiting part in the axial direction;

[0007] A positioning assembly, arranged between the first limiting part and the second limiting part, and the positioning assembly includes:

[0008] A moving structure, assembled on the central rod body and configured to linearly move in the axial direction;

[0009] A plurality of arm structures, equally spaced in the circumferential direction, and a single arm structure includes:

[0010] A first arm member, having a first docking end and a first mounting end, and the first mounting end is rotatably connected to the first limiting part;

[0011] A second arm member, having a second docking end and a second mounting end, the second docking end is connected to the first docking end and configured to relatively rotate around a virtual axis body, and the second mounting end is rotatably connected to the moving structure;

[0012] The positioning assembly further includes:

[0013] An elastic member is assembled on the moving structure. The elastic member is configured to be compressed when the moving structure moves to the position of the second limiting portion, and the restoring force of the elastic member is used as the supporting force of the arm body structure.

[0014] Preferably, the arm body structure further includes a rotating member, which is assembled at the connection position of the first docking end and the second docking end, and is configured to be rotatable around the virtual axis body, and the outer wall surface of the rotating member constitutes the contact surface between the positioning assembly and the inner wall of the oil pipe.

[0015] Preferably, the rotating member is a rolling bearing.

[0016] Preferably, the moving structure includes:

[0017] A second seat body member, which constitutes the assembly carrier of the second mounting end;

[0018] A first seat body member is assembled on the axial outer side of the second seat body member, and the elastic member is arranged between the first seat body member and the second seat body member.

[0019] Preferably, the moving structure further includes:

[0020] A slider is arranged on the axial outer side of the second seat body member and contacts the second mounting end of the second arm body member. The elastic member extends axially, and the two axial ends of the elastic member are respectively connected to the first seat body member and the slider member.

[0021] Preferably, the first seat body member has an axially extending first flange, and the second seat body member has an axially extending second flange. The second flange is located on the radial outer side of the first flange, and the first flange and the second flange are configured to be threadedly connected.

[0022] Preferably, the limiter further includes a guide rod body assembled at one end of the central rod body, and a barbed member is arranged on the guide rod body.

[0023] Preferably, the angle between the barbed member and the axis O is between 10° and 15°.

[0024] Preferably, the first arm body member and the first limiting portion, and the second arm body member and the moving structure are both connected by a pin shaft.

[0025] Preferably, the second limiting portion is configured as a joint component assembled at one end of the central rod body.

[0026] Preferably, the limiter is made of carbon steel material, forged steel material or stainless steel material.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0028] In this application, through the positioning component arranged on the central rod body, and by the supporting effect of the elastic component on the arm body structure, the arm body structure can adapt to different wellbore diameter changes in the wellbore, reducing the probability of encountering resistance due to pipe string deformation in the well. At the same time, the arm body structure can tightly support the inner wall of the pipe string, centering the fishing tool, increasing the contact probability between the barbs and the wire, and thus improving the fishing success rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of the limiter;

[0030] Figure 2 It is a schematic diagram of the external structure of the limiter.

[0031] In the figure:

[0032] 100, central rod body; 101, first limiting part; 102, second limiting part; 103, joint component; 104, guiding rod body; 105, barb component;

[0033] 200, moving structure; 201, first seat component; 201a, first flange; 202, second seat component; 202a, second flange; 203, slider component;

[0034] 300, arm body structure; 301, first arm body component; 301a, first installation end; 301b, first docking end; 302, second arm body component; 302a, second installation end; 302b, second docking end;

[0035] 400, elastic component; 401, rotating component. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0037] A testing wire rope fishing outer hook limiter (hereinafter referred to as the limiter), which is made of carbon steel material, forged steel material or stainless steel material. The limiter body is composed of a central rod body 100 and a positioning assembly. The central rod body 100 serves as the assembly carrier of the positioning assembly, and the central rod body 100 extends along the axis O and is provided with a first limiting portion 101 and a second limiting portion 102 in the axial direction. Exemplarily, the first limiting portion 101 and the second limiting portion 102 are respectively located at both ends of the central rod body 100 in the axial direction. Specifically, in some embodiments, the second limiting portion 102 is configured as a joint member 103 assembled at one end of the central rod body 100. One end of the joint member 103 is provided with a groove for the central rod body 100 to be inserted, and the outer wall surface of one end of the central rod body 100 and the inner wall surface of the groove are respectively provided with mutually adapted external threads and internal threads, that is, the joint member 103 and the central rod body 100 are configured as a threaded connection. Back to Figure 1 The first limiting portion 101 is formed by the outer wall surface of the central rod body 100 extending radially outward.

[0038] Refer to Figure 1 In some embodiments, the main body of the positioning assembly is composed of a moving structure 200, an elastic member 400 and at least two arm structures 300. Each arm structure 300 is arranged in the axial direction, and both ends of each arm structure 300 in the axial direction are respectively assembled on the moving structure 200 and the central rod body 100. At the same time, multiple arm structures 300 are equally spaced in the circumferential direction. Exemplarily, refer to Figure 2, the above-mentioned arm structure 300 is provided with three, at this time the angle between adjacent arm structures 300 in the circumferential direction is 120°, specifically, the above-mentioned single arm structure 300 includes a first arm frame 301 and a second arm member 302, one end of the first arm frame 301 and the second arm member 302 are connected to each other, and the other end is assembled on the central rod body 100, for the convenience of description, the two ends of the first arm frame 301 are respectively recorded as the first mounting end 301a and the first docking end 301b, and the two ends of the second arm member 302 are respectively recorded as the second mounting end 302a and the second docking end 302b, specifically, the first mounting end 301a of the above-mentioned first arm frame 301 is mounted The first arm body structure 301 is equipped on the first limiting portion 101 and is rotatably connected with the first limiting portion 101, so that the first docking end 301b of the first arm body structure 301 can rotate around the first mounting end 301a. Correspondingly, the second mounting end 302a of the second arm body member 302 is assembled on the mobile structure 200 and is rotatably connected with the mobile structure 200, that is, the second docking end 302b of the second arm body member 302 can rotate around the second mounting end 302a. In some examples, the first mounting end 301a and the first limiting portion 101, the second mounting end 302a and the mobile structure 200 are all connected by a pin shaft; at the same time, the first mounting end 301a of the first arm body structure 301 is connected to the second mounting end 302a of the second arm body member 302. The first butt joint end 301b and the second butt joint end 302b of the second arm body component 302 are configured as a rotational connection (for example, connected by a pin shaft) so that the first arm body frame 301 and the second arm body component 302 can rotate relative to each other around the same virtual axis. At the same time, the first butt joint end 301b of the first arm body frame 301 and the second butt joint end 302b of the second arm body component 302 are configured as contact ends of the positioning component and the inner wall of the oil pipe. During the use of the above-mentioned limiter, the portion where the first butt joint end 301b and the second butt joint end 302b are connected contacts with the inner wall of the oil pipe and supports the central rod body 100, so that the axis of the central rod body 100 and the axis of the oil pipe remain coincident. The main body of the scoop is located at the center of the oil pipe as much as possible. In some preferred embodiments, the positioning assembly also includes a rotating member 401, which is assembled at the connection position of the first arm frame 301 and the second arm member 302, and is configured to be rotatable around the virtual axis. At the same time, the outer wall surface of the rotating member 401 constitutes the contact surface between the positioning assembly and the inner wall of the oil pipe, so that the contact position between the positioning assembly and the inner wall of the oil pipe constitutes a rotational friction to reduce friction resistance. Exemplarily, the first butt end 301b and the second butt end 302b are connected by a pin shaft, and correspondingly, the rotating member 401 is a rolling bearing, and the axis of the rolling bearing coincides with the axis of the pin shaft.

[0039] Back to Figure 1, continue to describe the composition of the positioning component. The above-mentioned moving structure 200 is assembled on the outer wall surface of the central rod body 100 and is configured to linearly move along the axial direction. The axial movement of the moving structure 200 is limited by the first limiting portion 101. The elastic member 400 is configured to be compressed when the moving structure 200 moves to the position of the first limiting portion 101, and the connecting portion (or the rotating member 401) of the first docking end 301b and the second docking end 302b is kept in contact with the inner wall of the oil pipe through its elastic restoring force. That is, the restoring force of the elastic member 400 constitutes the supporting force of the arm body structure 300. In some embodiments, the moving structure 200 includes a seat body member. In some embodiments, the moving structure 200 includes a first seat body member 201 and a second seat body member 202. The second seat body member 202 constitutes the assembly carrier of the second mounting end 302a of the second arm body member 302. The first seat body member 201 is disposed on the axial outer side of the first seat body member 201 (i.e., the side away from the arm body structure 300). That is, the first seat body member 201 and the second seat body member 202 are spaced apart in the axial direction, and the first seat body member 201 and the second seat body member 202 are connected to form a motion community. In some examples, the first seat body member 201 and the second seat body member 202 are configured to be threadedly connected. Specifically, the first seat body member 201 and the second seat body member 202 both axially extend to form annular flanges. For the sake of distinction, the annular flanges on the first seat body member 201 and the second seat body member 202 are respectively denoted as the first flange 201a and the second flange 202a. The second flange 202a is located on the radial outer side of the first flange 201a, and the outer wall surface of the first flange 201a and the inner wall surface of the second flange 202a are respectively provided with matching external threads and internal threads to realize the threaded connection between the first seat body member 201 and the second seat body member 202. Back to Figure 1 , the moving structure 200 further includes a slider member 203. The slider member 203 is disposed on the axial outer side of the second seat body member 202 and is in contact with the second mounting end 302a of the second arm body member 302. During the movement of the second arm body member 302, that is, during the change of the angle between the second arm body member 302 and the axis O, the slider member 203 can move along the axial direction under the action of the second arm body member 302, so that the elastic member 400 is compressed. Correspondingly, the elastic member 400 is axially extended, and both ends of the elastic member 400 are respectively connected to the first seat body member 201 and the slider member 203.

[0040] Refer to Figure 1, in some embodiments, the above-mentioned limiter further includes a guide rod body 104 assembled at one end of the first limiting portion 101 of the central rod body 100. Exemplarily, the guide rod body 104 and the central rod body 100 are in threaded connection. Specifically, a groove for inserting one end of the guide rod body 104 is provided at one end of the central rod body 100, and external threads and internal threads that are adapted to each other are provided on the outer wall surface of the guide rod body 104 and the inner wall surface of the groove. The guide rod body 104 is assembled at one end of the central rod body 100 by screwing in. Further, a barbed member 105 is provided on the guide rod body 104.

[0041] The usage steps of the above-mentioned limiter are as follows:

[0042] Step 1: Tool preparation

[0043] First, determine the type of the wire or cable dropped into the well and the size of the wellbore according to the data, and then select a wire that can withstand a greater pulling force than the wire or cable dropped into the well and a fishing tool with a matching size, and connect this fishing tool to the wire joint on the fishing vehicle.

[0044] Step 2: Detect the landing point of the wire and complete the fishing

[0045] Slowly lower the fishing tool to detect the position of the wire dropped object. At this time, the fishing tool is centered on the inner wall of the wellbore under the support of the arm body structure 300.

[0046] When detecting the position of the wire dropped object, you can try to repeatedly lift and lower at the blocked position. If the tension of the Martin Decker on the fishing vehicle drops in all cases, and when the reduced weight is greater than the self-weight of the fishing tool, it indicates that the wire dropped fish has been detected. At this time, the tool moves downward under the action of the weight rod. Under the restoring force of the elastic member 400, the arm body structure 300 centers the fishing tool on the inner wall of the tubing. Under the impact of repeated lifting and lowering, the arm body structure 300 gradually squeezes the wire into a ball, and the barbs at the front end of the tool penetrate into the grouped wire. Lift the fishing tool and observe the tension change. When the tension is greater than the static tension before the tool reaches the landing point of the wire, the wire is hooked by the barbs, and slowly lift the tool to the wellhead to complete the fishing.

[0047] If there is no tension fluctuation after lifting more than the length of the broken wire, it indicates that it has not been caught, and you can continue to repeat Step 2 until it is caught; if the tension suddenly decreases significantly during the lifting process, it may be that the wire has come off from the barb position. At this time, repeat Step 2 until the fishing is completed.

[0048] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A testing wire rope fishing external hook limiter, characterized in that: It includes: A central rod body, arranged along the axis O, and respectively provided with a first limiting part and a second limiting part in the axial direction; A positioning assembly, arranged between the first limiting part and the second limiting part, and the positioning assembly includes: A moving structure, assembled on the central rod body and configured to linearly move in the axial direction; A plurality of arm body structures, equally spaced in the circumferential direction, and a single arm body structure includes: A first arm body member, having a first docking end and a first mounting end, and the first mounting end is rotatably connected to the first limiting part; A second arm body member, having a second docking end and a second mounting end, and the second docking end is connected to the first docking end and configured to relatively rotate around a virtual axis body, and the second mounting end is rotatably connected to the moving structure; The positioning assembly further includes: An elastic member, assembled on the moving structure, and the elastic member is configured to be compressed when the moving structure moves to the position of the second limiting part, and the restoring force of the elastic member is used as the supporting force of the arm body structure.

2. A testing wire rope fishing external hook limiter according to claim 1, characterized in that: The arm body structure further includes a rotating member, and the rotating member is assembled at the connection position of the first docking end and the second docking end and configured to rotate around the virtual axis body, and the outer wall surface of the rotating member constitutes the contact surface between the positioning assembly and the inner wall of the oil pipe.

3. A testing wire rope fishing external hook limiter according to claim 2, characterized in that: The rotating member is a rolling bearing.

4. A testing wire rope fishing external hook limiter according to claim 1, characterized in that: The moving structure includes: A second seat body member, which constitutes the assembly carrier of the second mounting end; A first seat body member, assembled on the axial outer side of the second seat body member, and the elastic member is arranged between the first seat body member and the second seat body member.

5. A testing wire rope fishing external hook limiter according to claim 4, characterized in that: The moving structure further includes: A slider, which is arranged on the axial outer side of the second seat body member and contacts the second mounting end of the second arm body member, the elastic member extends axially, and the two axial ends of the elastic member are respectively connected to the first seat body member and the slider member.

6. A testing wire rope fishing external hook limiter according to claim 5, characterized in that: The first seat body member has an axially extending first flange, and the second seat body member has an axially extending second flange, the second flange is located on the radial outer side of the first flange, and the first flange and the second flange are configured to be threadedly connected.

7. A testing wire rope fishing external hook limiter according to claim 1, characterized in that: The limiter further includes a guiding rod body assembled at one end of the central rod body, and a barbed member is provided on the guiding rod body.

8. A testing wire rope fishing external hook limiter according to claim 7, characterized in that: The included angle between the barbed member and the axis O is between 10° and 15°.

9. A testing wire rope fishing external hook limiter according to claim 1, characterized in that: Both between the first arm body member and the first limiting portion, and between the second arm body member and the moving structure are connected by a pin shaft.

10. A testing wire rope fishing external hook limiter according to claim 1, characterized in that: The second limiting portion is configured as a joint component assembled at one end of the central rod body.

11. A testing wire rope fishing external hook limiter according to claim 1, characterized in that: The limiter is made of carbon steel material, forged steel material or stainless steel material.

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