Tool for increasing length of coiled tubing cut and fished through pipe

Abstract

The utility model provides a tool for increasing the length of a coiled tubing cut and fished through a pipe. The tool comprises a first connecting piece, a second connecting piece and a stretching piece. The first connecting piece is connected with the coiled tubing; the second connecting piece is detachably connected with the first connecting piece, and the second connecting piece is provided with a cavity; the stretching piece is provided with a rotating part, the stretching piece is rotationally connected with the second connecting piece through the rotating part, and the stretching piece is provided with a connecting part. The first connecting piece is connected with the coiled tubing, the second connecting piece is connected with the first connecting piece and the stretching piece, the stretching piece is connected with the lifting mechanism, a cavity is formed in the second connecting piece, and the rotating part of the stretching piece is assembled in the cavity, so that the second connecting piece can rotate relative to the rotating part of the stretching piece; therefore, the assembly with the first connecting piece is facilitated. And then the first connecting piece is lifted through the lifting mechanism, so that the coiled tubing is straightened, the space between the coiled tubing and the inner wall of the shaft is released, and the cutting and fishing tool can be put down conveniently to reach the clamping point position.

Description

Technical Field

[0001] This application relates to the technical field of oil and gas exploitation, and particularly to a tool for increasing the length of coiled tubing for pipe-passing cutting and fishing Background Art

[0002] With the development of oil and gas field development technologies, coiled tubing, as an efficient downhole operation tool, has been widely used in fields such as drilling, well completion, and workover. Due to its continuous conveyance characteristics, coiled tubing can significantly improve operation efficiency and reduce operation costs. However, in the actual application process, it also faces some challenges.

[0003] Coiled tubing is usually composed of long seamless steel pipes without the threaded connection parts of traditional tubing, so it has higher flexibility during downhole operations. However, due to its structural characteristics, it is prone to sticking accidents when encountering complex well conditions or improper operations. Compared with traditional segmented tubing, once coiled tubing gets stuck, due to its integrity, it cannot be released like ordinary tubing by rotating or back-off methods, which brings additional difficulties to the treatment. Currently, the main solution to the problem of coiled tubing sticking is to lower a coiled tubing cutting and fishing device into the wellbore until the sticking point of the coiled tubing, cut the coiled tubing at the sticking point, and then lift the coiled tubing out of the well.

[0004] However, due to the flexibility of coiled tubing, it is bent to a certain extent in the wellbore, resulting in too small a gap between the coiled tubing and the wellbore, making it difficult to lower the cutting and fishing device, especially in the horizontal well section, where the narrow gap between the coiled tubing and the wellbore makes it difficult to lower the cutting and fishing device and unable to reach the sticking point of the coiled tubing to effectively cut and release the coiled tubing. In view of the above situation, there is an urgent need for a new technical solution for dealing with coiled tubing sticking, which should be able to effectively avoid the defects in the prior art and achieve fast and reliable release operations on the premise of ensuring safety. Summary of the Utility Model

[0005] The purpose of the embodiments of this application is to provide a tool for increasing the length of coiled tubing for pipe-passing cutting and fishing, so that the cutting and fishing device of the coiled tubing can reach the sticking point of the coiled tubing and accurately and effectively cut and release the coiled tubing.

[0006] To solve the above technical problems, the following technical solutions are provided in the embodiments of this application:

[0007] This application proposes a tool for increasing the length of coiled tubing for pipe-passing cutting and fishing, including: a first connector, a second connector, and a stretching member; one end of the first connector is connected to the coiled tubing; the second connector is detachably connected to the other end of the first connector, and the second connector has a chamber inside;

[0008] A first end of the stretching member is provided with a rotating portion, the rotating portion extends into the chamber, the stretching member is rotatably connected to the second connecting member by means of the rotating portion, a second end of the stretching member extends in a direction away from the first end, and the second end is provided with a connecting portion for connecting to a lifting mechanism.

[0009] In some embodiments, the second connecting member includes a first opening and a second opening, the first opening and the second opening are respectively oppositely arranged at the first end and the second end of the second connecting member, and both are in communication with the chamber;

[0010] The chamber includes a first chamber and a second chamber that communicate with each other. The first chamber is arranged adjacent to the first end of the second connecting member, the second chamber is arranged adjacent to the second end of the second connecting member, and the first opening is in communication with the first chamber, and the second opening is in communication with the second chamber; the first opening is smaller than the second opening;

[0011] Wherein, the first chamber is equipped with a rotating portion, and the second chamber is equipped with a first connecting member.

[0012] In some embodiments, the outer contour of the rotating portion is adapted to the inner contour of the first chamber, and the inner diameter of the first chamber is not greater than the inner diameter of the second chamber.

[0013] In some embodiments, the rotating portion is cylindrical, and the axis of the rotating portion is collinear with the axis of the first chamber, and the rotating portion is fixedly arranged with the stretching member.

[0014] In some embodiments, a pressure bearing is further included, the pressure bearing is assembled in the first chamber, and the rotation axis of the pressure bearing is collinear with the central axis of the first chamber;

[0015] Two opposite sides of the pressure bearing are respectively in abutting contact with the first chamber and the rotating portion.

[0016] In some embodiments, the rotating portion is frustum-shaped, and the end with a smaller radial cross-sectional area of the rotating portion is connected to the first end of the stretching member.

[0017] In some embodiments, the rotating portion is spherical, and the first chamber is provided with a spherical socket.

[0018] In some embodiments, an external thread is provided at the other end of the first connecting member, and an internal thread is provided on the inner wall of the second chamber.

[0019] In some embodiments, a fastener is further included, the fastener is spaced apart from the second connecting member and is located on one side of the first end of the second connecting member;

[0020] The fastener includes a first through hole and a second through hole, both the first through hole and the second through hole penetrate through the fastener, and the axis of the first through hole is parallel to the axis of the second through hole;

[0021] Wherein, the second end of the tensile member penetrates into either the first through-hole or the second through-hole, passes through the fastener, then faces the fastener and penetrates into the other one of the first through-hole and the second through-hole again, and passes through the fastener, so that the tensile member forms an annular structure on one side of the fastener to form a connecting portion.

[0022] In some embodiments, the tensile member is a wire rope or a steel cable.

[0023] Compared with the prior art, the tool for increasing the length of the coiled tubing for pipe-piercing cutting and fishing provided by the present application is connected to the part of the coiled tubing exposed outside the wellbore through the first connecting member. The second connecting member is respectively connected to the first connecting member and the tensile member. The tensile member is connected to the lifting mechanism. A cavity is provided in the second connecting member, and the rotating part of the tensile member is assembled in the cavity, so that the second connecting member can rotate relative to the rotating part of the tensile member, facilitating the assembly with the first connecting member. Then, the lifting force is provided by the lifting mechanism and transmitted to the first connecting member, so that the tool for increasing the length of the coiled tubing for pipe-piercing cutting and fishing transmits the lifting force to the coiled tubing, straightens the coiled tubing, releases the space between the coiled tubing and the inner wall of the wellbore, which helps the cutting and fishing tool to be lowered to the stuck point position of the coiled tubing. Description of the Drawings

[0024] By referring to the drawings and reading the detailed description below, the above and other objects, features and advantages of the exemplary embodiments of the present application will become easily understandable. In the drawings, several embodiments of the present application are shown in an exemplary rather than restrictive manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0025] Figure 1 Schematically shows the overall structural diagram of the tool for increasing the length of the coiled tubing for pipe-piercing cutting and fishing;

[0026] Figure 2 Schematically shows the cross-sectional view of the assembly of the second connecting member and the tensile member of the tool for increasing the length of the coiled tubing for pipe-piercing cutting and fishing;

[0027] Figure 3 Schematically shows the cross-sectional view of the second connecting member of the tool for increasing the length of the coiled tubing for pipe-piercing cutting and fishing;

[0028] Figure 4 Schematically shows Figure 3 the schematic diagram of the pressure bearing assembled inside the second connecting member in

[0029] Figure 5 Schematically shows the cross-sectional view of the second connecting member of the tool for increasing the length of the coiled tubing for pipe-piercing cutting and fishing provided with a ball seat;

[0030] Figure 6A schematic structural diagram of a fastener of a tool for increasing the length of coiled tubing for pipe threading, cutting, and fishing is shown schematically;

[0031] Figure 7 A usage state diagram of a tool for increasing the length of coiled tubing for pipe threading, cutting, and fishing is shown schematically.

[0032] Explanation of the reference numerals in the drawings:

[0033] 10. First connecting member; 20. Second connecting member; 21. Chamber; 211. First chamber; 2111. Ball socket; 212. Second chamber; 22. First opening; 23. Second opening; 30. Tensile member; 31. Rotating part; 32. Connecting part; 40. Pressure bearing; 50. Fastener; 51. First through hole; 52. Second through hole. Detailed implementation manners

[0034] The exemplary embodiments disclosed in the present application will be described in more detail below with reference to the drawings. Although the exemplary embodiments disclosed in the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present application can be more thoroughly understood and the scope of the present application can be completely conveyed to those skilled in the art.

[0035] It should be noted that unless otherwise specified, the technical terms or scientific terms used in the present application should have the ordinary meaning understood by those skilled in the art to which the present application belongs.

[0036] Because the strength of the coiled tubing is limited and it cannot be directly lifted by the hook of the workover rig, it is easy to cause the coiled tubing to break. Therefore, cutting and fishing technology is mostly used to fish the stuck coiled tubing.

[0037] Moreover, due to the flexibility of the coiled tubing, it is not in a vertical state in the wellbore but is bent to a certain extent, resulting in too small a gap between the coiled tubing and the wellbore wall. When lowering the cutting and fishing device, it is restricted by the gap distance between the coiled tubing and the pipe wall and cannot be continuously and quickly lowered to the stuck point position of the coiled tubing. Especially when the stuck point of the coiled tubing is located in the horizontal well section, the cutting and pulling device cannot reach the stuck point position of the coiled tubing by means of gravity, and it is impossible to effectively and accurately cut the stuck point of the coiled tubing.

[0038] To solve the above problems, the present application proposes a tool for increasing the length of the coiled tubing for pipe-passing cutting and fishing, which includes a first connector, a second connector, and a stretching member. The first connector is connected to the part of the coiled tubing that is exposed outside the wellbore. The second connector is respectively connected to the first connector and the stretching member. The stretching member is connected to a lifting mechanism. The lifting mechanism provides a lifting force that is transmitted to the first connector, so that the tool for increasing the length of the coiled tubing for pipe-passing cutting and fishing transmits the lifting force to the coiled tubing, straightens the coiled tubing, releases the space between the coiled tubing and the inner wall of the wellbore, which helps the cutting and fishing tool to be lowered to the stuck point position of the coiled tubing directly.

[0039] Refer to the attached Figure 1-7 As shown in the figure, Embodiment 1 of the present application proposes a tool for increasing the length of the coiled tubing for pipe-passing cutting and fishing. The tool includes a first connector 10, a second connector 20, and a stretching member 30;

[0040] The first connector 10, one end of the first connector 10 is connected to the coiled tubing;

[0041] The second connector 20, the second connector 20 is detachably connected to the other end of the first connector 10, and the inside of the second connector 20 has a chamber 21;

[0042] The stretching member 30, a rotating part 31 is provided at the first end of the stretching member 30. The rotating part 31 extends into the chamber 21. The stretching member 30 is rotatably connected to the second connector 20 by using the rotating part 31. The second end of the stretching member 30 extends in a direction away from the first end, and a connecting part 32 is provided at the second end. The connecting part 32 is used to connect to the lifting mechanism.

[0043] Specifically, to solve the above technical problems, the present application proposes a tool for increasing the length of the coiled tubing for pipe-passing cutting and fishing. The tool can effectively straighten the coiled tubing, thereby expanding the space between the coiled tubing and the inner wall of the wellbore, facilitating the smooth lowering of the cutting and fishing tool and accurately reaching the stuck point position.

[0044] In the technical solution adopted by the present application, the first connector 10 is pre-connected to the coiled tubing as an independent part. The second connector 20 and the stretching member 30 are used as a whole, so that the second connector 20 is detachably and cooperatively connected to the first connector 10, and the stretching member 30 is connected to the lifting mechanism, such as the hook of a workover rig, to transmit the lifting force of the workover rig to the coiled tubing section;

[0045] One end of the first connector 10 is designed to be connected to the coiled tubing exposed outside the wellbore. The first connector 10 can be selected as a roller-on joint to enhance the connection reliability; it can also use a quick-lock joint, a hydraulic clamping joint, etc.

[0046] The second connecting member 20 has both compatibility with the first connecting member 10 and good cooperation with the stretching member 30.

[0047] Among them, the first connecting member 10 is a quick-locking joint, and the second connecting member 20 is a snap-type connecting member; or, the first connecting member 10 is a hydraulic clamping joint, and the second connecting member 20 is a threaded connecting member; or the first connecting member 10 is a roll-on joint, and the second connecting member 20 is an internal thread sleeve.

[0048] The second connecting member 20 has a chamber 21, and the chamber 21 can accommodate the rotating part 31 of the stretching member 30. The stretching member 30 is combined with the second connecting member 20 in a rotational connection manner. Through the rotational connection method, the second connecting member 20 adjusts the angle relative to the first connecting member 10, which is convenient for installation. For example, when the first connecting member 10 and the second connecting member 20 are installed in a threaded structure, the first connecting member 10 has an external thread, and the second connecting member 20 is a sleeve structure. The inner wall of the sleeve structure has an internal thread. The threaded connection is achieved by docking the first connecting member 10 and the second connecting member 20 and rotating the second connecting member 20. At this time, since the stretching member 30 is rotationally connected to the second connecting member 20 by using the rotating part 31, the second connecting member 20 can rotate relative to the stretching member 30, while the stretching member 30 remains in a stable and immovable state, which is convenient for the assembly of the first connecting member 10 and the second connecting member 20.

[0049] The stretching member 30 can be a steel wire rope or a steel cable. The steel cable is formed by stranding multiple steel wire ropes, which is stronger, has greater strength, higher tensile strength, and better durability than a single-strand steel wire rope.

[0050] The other end of the stretching member 30 is provided with a connecting part 32, and this connecting part 32 is used to connect with the hook of the workover rig or other lifting devices. When the workover rig provides a lifting force, the stretching member 30 can transmit this force to the coiled tubing to straighten it along the wellbore direction.

[0051] Among them, the connecting part 32 can be a hook-type structure, and is hung on the hook of the workover rig or other lifting equipment through an open hook, which has the effects of simple operation, easy hanging and unloading.

[0052] The connecting part 32 can be a steel wire rope. Using the steel wire rope as a connecting medium, one end is fixed on the stretching member 30, and the other end is connected to the lifting equipment. The steel wire rope has good flexibility and can adapt to complex working environments. It is suitable for situations that require both flexibility and strength.

[0053] The connecting part 32 can also be a snap ring structure, similar to the snap ring used for mountaineering, and connects the stretching member 30 and the lifting equipment through the snap ring. It has the characteristics of simple operation and quick connection, and can be applied to temporary operations that require quick connection.

[0054] Working process:

[0055] Pre-connect the first connection structure to the coiled tubing; for example, first quickly fix the roller joint to the exposed part of the coiled tubing;

[0056] Introduce the tubing, where the inner diameter of the tubing is larger than the outer diameter of the coiled tubing. A cutting and fishing device is installed at one end of the tubing. Let the tensile member 30 pass through the tubing, and connect the second connecting member 20 at the end of the tensile member 30 to the first connecting member 10. Lift the tensile member 30 to straighten the coiled tubing, so that the originally narrow gap can be enlarged, enabling the tubing equipped with the cutting and fishing device to smoothly enter the wellbore. At this time, lower another section of tubing, sleeve the tubing outside the tensile member 30, connect it to the previous section of tubing, and extend the total length of the tubing. By continuously increasing the number of tubing sections, the depth of the cutting and fishing device going down the well can be increased until the stuck point position of the coiled tubing is reached.

[0057] Since the originally narrow gap is enlarged, the cutting and fishing tool can more easily pass through and reach the stuck point position for effective cutting operation.

[0058] Among them, during the continuous lowering of the tubing, the connection part 32 of the tensile member 30 can be disengaged from the lifting device, such as separated from the hook of the workover rig. Then, let the newly introduced tubing be sleeved outside the tensile member 30, connect one end of the new tubing to the original tubing, and let the connection part 32 of the tensile member 30 extend out from the other end of the new tubing and then connect to the hook. The workover rig provides a lifting force to straighten the coiled tubing, so that the coiled tubing is straightened, the originally narrow gap is enlarged, and multiple groups of tubing can smoothly enter the wellbore. Repeat the above steps, continuously introduce new tubing until the total length of the tubing can reach the stuck point of the coiled tubing, and then start the cutting and fishing device to cut the coiled tubing and solve the stuck pipe problem of the coiled tubing.

[0059] During the continuous lowering of the tubing, the method of splitting the second connecting member 20 from the first connecting member 10 can also be adopted. The hook of the workover rig lifts the tensile member 30 and the second connecting member 20, and then they fall into the newly introduced tubing and pass through the tubing. After the second connecting member 20 is connected to the first connecting member 10, connect the new tubing to the original tubing. Then, use the hook of the workover rig to lift the tensile member 30, so that the coiled tubing is straightened, the originally narrow gap is enlarged, and the tubing equipped with the cutting and fishing device can continuously enter the wellbore. Repeat the above steps, continuously introduce new tubing until the total length of the tubing can reach the stuck point of the coiled tubing. Among them, the length of the tensile member 30 is longer than the length of a single tubing section.

[0060] It should be noted that the cutting and fishing device is a device well-known to those skilled in the art and can be directly obtained through procurement.

[0061] The tool for increasing the length of the continuous tubing for cutting and salvaging proposed in the present application not only simplifies the connection steps and improves the safety and reliability of the connection through the cooperation of the first connecting piece 10 and the second connecting piece 20, but also effectively solves the problem of lowering the cutting and salvaging device when the continuous tubing is stuck in the drill, thereby improving the efficiency and safety of handling the problem of continuous tubing being stuck in the drill.

[0062] Further, in some embodiments, the second connecting member 20 includes a first opening 22 and a second opening 23, the first opening 22 and the second opening 23 are respectively disposed at the first end and the second end of the second connecting member 20, and are both connected to the chamber 21;

[0063] The chamber 21 includes a first chamber 211 and a second chamber 212 which are connected to each other. The first chamber 211 is arranged near the first end of the second connecting member 20, and the second chamber 212 is arranged near the second end of the second connecting member 20. The first opening 22 is connected to the first chamber 211, and the second opening 23 is connected to the second chamber 212. The first opening 22 is smaller than the second opening 23.

[0064] The first chamber 211 is equipped with a rotating part 31 , and the second chamber 212 is equipped with a first connecting member 10 .

[0065] Specifically, the second connecting member 20 is a cylindrical structure with two ends connected, and the cylindrical structure includes a first chamber 211 and a second chamber 212 adjacently arranged therein;

[0066] When the stretching member 30 and the second connecting member 20 are installed, the end of the stretching member 30 away from the rotating part 31 is passed through the second opening 23 of the second connecting member 20 and comes out from the first opening 22; and the rotating part 31 is assembled into the first chamber 211. At this time, the outer contour of the rotating part 31 is smaller than the internal space of the first chamber 211 and the second chamber 212, and larger than the diameter of the first opening 22, so that the rotating part 31 can be confined in the first chamber 211.

[0067] The rotating part 31 is assembled in the first chamber 211, and the rotating part 31 can rotate in the first chamber 211. The second connecting member 20 can rotate relative to the first connecting member 10 to adjust the angle, thereby facilitating installation and operation. The existence of the rotating part 31 allows the second connecting member 20 to rotate freely within a certain range to meet the connection requirements in different directions. When the threaded structure is used for connection, the second connecting member 20 can be rotated to achieve the effect of quick disassembly from the first connecting member 10.

[0068] The first connecting member 10 is assembled in the second chamber 212. Since the second opening 23 is relatively large, the first connecting member 10 can be inserted from here and connected to the second chamber 212 of the second connecting member 20. This design enables the first connecting member 10 to be easily connected to or separated from the second connecting member 20, improving the convenience of operation.

[0069] Furthermore, in some embodiments,

[0070] The outer contour of the rotating portion 31 is adapted to the inner contour of the first chamber 211, and the inner diameter of the first chamber 211 is not greater than the inner diameter of the second chamber 212.

[0071] Specifically, in order to cooperate with the first chamber 211 of the second connecting member 20, the outer contour of the rotating portion 31 needs to match the inner contour of the first chamber 211 to ensure that the rotating portion 31 can be smoothly inserted into the first chamber 211 and have a clearance fit with the first chamber 211, enabling the second connecting portion 32 to rotate stably relative to the rotating portion 31, facilitating the mating installation of the second connecting member 20 and the first connecting member 10. In particular, when installed through a threaded structure, the stable rotation of the second connecting member 20 can improve the installation efficiency.

[0072] Among them, the outer contour of the rotating portion 31 can be cylindrical, frustum-shaped, or spherical.

[0073] The diameter or width of the rotating portion 31 must match the inner diameter or width of the first chamber 211 to ensure smooth insertion.

[0074] The surface of the rotating portion 31 is treated, such as for smoothness and rust prevention, etc., thereby reducing the friction between the rotating portion 31 and the inner wall of the first chamber 211, making the rotation of the second connecting member 20 relative to the rotating portion 31 smooth and non-stuttering.

[0075] Furthermore, in some embodiments, the rotating portion 31 is cylindrical, and the axis of the rotating portion 31 is collinear with the axis of the first chamber 211, and the rotating portion 31 is fixedly arranged with the tension member 30.

[0076] Specifically, when the tension member 30 needs to be connected to the second connecting member 20, the end with the cylindrical rotating portion 31 is inserted into the first chamber 211 of the second connecting member 20. Since the rotating portion 31 is designed as a cylinder, the side wall of the cylinder can be closely combined with the inner surface of the first chamber 211 and freely rotate within the chamber 21 to adapt to different angle adjustment requirements.

[0077] The rotating portion 31 is fixedly arranged with the tension member 30, and the rotating portion 31 and the tension member 30 are integrated, and there is no relative movement between the two. It can ensure that when a tensile force is applied, the tension member 30 will not slide or separate from the rotating portion 31, thereby improving the reliability of the entire device.

[0078] The rotating part 31 and the stretching part 30 are integrally arranged, so that no additional fixing measures are required during the installation process. It only needs to insert the stretching part 30 into the first chamber 211 to complete the assembly.

[0079] Among them, the fixed setting can be integrally forged or welded and fixed.

[0080] Furthermore, in some embodiments, it further includes:

[0081] A pressure bearing 40, which is assembled in the first chamber 211, and the rotation axis of the pressure bearing 40 is collinear with the central axis of the first chamber 211;

[0082] The two opposite sides of the pressure bearing 40 are respectively in abutting contact with the first chamber 211 and the rotating part 31.

[0083] Specifically, in order to improve the smoothness of the rotation of the second connecting member 20, the center line of the pressure bearing 40 and the center line of the first chamber 211 are on the same axis, ensuring the balance and stability of the rotation.

[0084] The two sides of the pressure bearing 40 are respectively in abutting contact with the inner wall of the first chamber 211 and the outer surface of the rotating part 31. So that when the pressure bearing 40 bears axial or radial loads, it can evenly distribute the force and reduce the frictional loss between the rotating part 31 and the inner wall of the first chamber.

[0085] When the workover rig lifts the stretching part 30, a pressure bearing 40 is installed between the rotating part 31 and the first chamber 211. When the second connecting member 20 rotates, the pressure bearing 40 can reduce the friction between the rotating part 31 and the first chamber 211, enabling the rotating part 31 to rotate more smoothly in the first chamber 211, reducing the resistance and improving the operation efficiency.

[0086] Furthermore, in some embodiments,

[0087] The rotating part 31 is frustum-shaped, and the end with a smaller radial cross-sectional area of the rotating part 31 is connected to the first end of the stretching part 30.

[0088] Specifically, the rotating part 31 is designed to be frustum-shaped, that is, the diameter of one end is larger than that of the other end, forming a frustum structure with one end being the thin end and the other end being the thick end.

[0089] The thin end of the rotating part 31 is first inserted into the first chamber 211, and then the wide end gradually enters the chamber 21. Due to the frustum-shaped structure, the rotating part 31 can more easily enter the first chamber 211 by using the thin end, improving the assembly efficiency, and the frustum structure is adapted to the first chamber 211;

[0090] When a tensile force is applied through the tensile member 30, the tensile force is transmitted to the entire rotating portion 31 through the thin end of the rotating portion 31 and finally transmitted to the second connecting member 20. The frustum shape design enables the rotating portion 31 to better disperse stress when bearing the tensile force, so as to reduce local stress concentration. The rotating portion 31 being set in a frustum shape provides a better supporting effect, and even when bearing a large tensile force, it can maintain smooth rotation between the rotating portion 31 and the second connecting member 20, thereby enhancing the stability of the entire device.

[0091] Furthermore, in some embodiments,

[0092] The rotating portion 31 is spherical, and the first chamber 211 is provided with a ball socket 2111.

[0093] Specifically, the rotating portion 31 is set as a sphere. In the first chamber 211, a ball socket 2111 adapted to the sphere is provided so that the spherical rotating portion 31 can be embedded in the ball socket 2111. At this time, the size of the ball socket 2111 is slightly larger than the diameter of the spherical rotating portion 31. Due to the spherical design, the spherical rotating portion 31 can be smoothly inserted into the ball socket 2111 in the first chamber 211 even when the angles are misaligned. The assembly efficiency is improved, and the second connecting member 20 can rotate relative to the rotating portion 31 in any direction, and can meet the matching connection with the first connecting member 10 at different angles.

[0094] When a tensile force is applied to the tensile member 30, the tensile force is transmitted to the ball socket 2111 through the spherical rotating portion 31 and finally transmitted to the second connecting member 20. The spherical design enables the rotating portion 31 to better disperse stress when bearing the tensile force, reducing local stress concentration. The spherical design enables the rotating portion 31 to achieve multi-directional rotation within the ball socket 2111, ensuring the smoothness and symmetry of the rotating portion 31 during rotation.

[0095] Furthermore, in some embodiments, the other end of the first connecting member 10 is provided with an external thread, and the inner wall of the second chamber 212 is provided with an internal thread.

[0096] Specifically, when it is necessary to connect the first connecting member 10 and the second connecting member 20, the operator only needs to insert the external thread end of the first connecting member 10 into the second chamber 212 of the second connecting member 20 and tighten the two by rotating the second connecting member 20.

[0097] Through the threaded connection, a firm mechanical connection is formed between the first connecting member 10 and the second connecting member 20, ensuring that it will not loosen or fall off during the stretching process. When disassembly is required, only by rotating the first connecting member 10 in the reverse direction can it be easily removed from the second connecting member 20.

[0098] In particular, when the thread structure is a coarse thread, the coarse thread has a larger pitch, a shallower tooth shape, and a relatively large bearing area for each tooth. Therefore, when subjected to tension, the coarse thread can provide better tensile strength.

[0099] Coarse threads can withstand greater shear forces because the larger pitch provides more contact area to distribute the shear forces.

[0100] Furthermore, in some embodiments, a fastener 50 is further included, the fastener 50 is spaced apart from the second connecting member 20 and is located at one side of the first end of the second connecting member 20;

[0101] The fastener 50 includes a first through hole 51 and a second through hole 52. Both the first through hole 51 and the second through hole 52 penetrate the fastener 50, and the axis of the first through hole 51 is parallel to the axis of the second through hole 52.

[0102] Among them, the second end of the stretching member 30 passes through any one of the first through hole 51 and the second through hole 52, and passes through the fastener 50, and then passes toward the fastener 50 and passes through the other of the first through hole 51 and the second through hole 52 again, and passes through the fastener 50, so that the stretching member 30 forms an annular structure on one side of the fastener 50 to form a connecting portion 32.

[0103] Specifically, by using the fastener 50 and the structure of the tensile member 30 itself, the tensile member 30 is inserted twice, so that a ring structure is formed on one side of the fastener 50. The ring structure is used as a connecting portion 32 for connecting with a well repair machine or other lifting equipment.

[0104] The ring structure can evenly distribute the force of the tensile member 30 on the fastener 50, avoiding damage to the connection caused by local stress concentration. The ring structure formed by two insertions ensures the reliability of the connection and prevents slippage when the tension is applied. The ring structure can provide sufficient tensile strength to ensure that the connection will not loosen when subjected to a large tensile force.

[0105] During the operation, the coiled tubing needs to be straightened to release the space between it and the wellbore. At this time, the fastener 50 is spaced apart from the second connecting member 20 and is located on one side of the first end of the second connecting member 20. The second end of the tensioning member 30 is inserted into the through hole on the fastener 50 twice to form a ring structure, which is used as a connecting part 32 for connecting with a workover machine or other lifting equipment. The operator can quickly connect the tensioning member 30 to the lifting equipment to ensure the reliability of the connection during the tensioning process.

[0106] Through the above design, the annular structure formed by the fastener 50 and the tensile member 30 not only improves the reliability and stability of the tool for increasing the length of the tubing cutting and salvaging the coiled tubing, but also improves the convenience of operation and the service life of the equipment.

[0107] Furthermore, in some embodiments, the tension member 30 is a wire rope or a steel cable.

[0108] Specifically, a wire rope is usually formed by stranding multiple strands of fine steel wires and has good flexibility and tensile strength.

[0109] A steel cable is also formed by stranding multiple strands of steel wires, but it is usually thicker than a wire rope and has a higher tensile strength, making it suitable for carrying a greater weight.

[0110] By using a wire rope or a steel cable as the tension member 30 and combining it with the fastener 50 to form a ring structure design, not only the reliability and stability of the tool for increasing the length of the coiled tubing for pipe threading cutting and fishing are improved, but also the operational convenience and the service life of the equipment are enhanced. This design exhibits better performance in practical applications, especially suitable for working environments that require bearing large tensile forces and rapid connection.

[0111] It should be noted that in the description of this specification, the orientation or positional relationship indicated by terms such as "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to this application; terms such as "connection", "installation", "fixation", etc. should all be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0112] In the description of this specification, the descriptions of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or instance. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0113] The above is only the specific implementation manner of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art within the technical scope disclosed by this application can easily think of changes or substitutions, which should all be covered by the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claimed rights.

Claims

1. A tool for increasing the length of coiled tubing for cutting and salvaging, characterized in that: include: a first connecting member, one end of which is connected to the coiled tubing; a second connecting member, the second connecting member being detachably connected to the other end of the first connecting member, and the second connecting member having a chamber inside; A stretching member, wherein a rotating portion is provided at the first end of the stretching member, and the rotating portion extends into the chamber. The stretching member is rotatably connected to the second connecting member by means of the rotating portion. The second end of the stretching member extends in a direction away from the first end, and the second end is provided with a connecting portion, and the connecting portion is used to connect to a lifting mechanism.

2. The tool for increasing the length of coiled tubing for cutting and salvaging according to claim 1, characterized in that: The second connecting member includes a first opening and a second opening, wherein the first opening and the second opening are respectively arranged at a first end and a second end of the second connecting member opposite to each other and are both communicated with the chamber; The chamber comprises a first chamber and a second chamber which are connected to each other, the first chamber is arranged adjacent to the first end of the second connecting member, the second chamber is arranged adjacent to the second end of the second connecting member, the first opening is connected to the first chamber, and the second opening is connected to the second chamber; the first opening is smaller than the second opening; Wherein, the first chamber is equipped with the rotating part, and the second chamber is equipped with the first connecting member.

3. The tool for increasing the length of coiled tubing for cutting and salvaging according to claim 2, characterized in that: The outer contour of the rotating part is matched with the inner contour of the first chamber, and the inner diameter of the first chamber is not greater than the inner diameter of the second chamber.

4. The tool for increasing the length of coiled tubing for cutting and salvaging according to claim 3 is characterized in that: The rotating part is cylindrical, and the axis of the rotating part is colinear with the axis of the first chamber. The rotating part is fixedly arranged with the stretching member.

5. The tool for increasing the length of coiled tubing for cutting and salvaging according to claim 4, characterized in that: Also includes: A pressure bearing, the pressure bearing is assembled in the first chamber, and the rotation axis of the pressure bearing is arranged colinearly with the central axis of the first chamber; The opposite sides of the pressure bearing are respectively in contact with the first chamber and the rotating part.

6. The tool for increasing the length of coiled tubing for cutting and salvaging according to claim 3, characterized in that: The rotating part is in a frustum shape, and an end of the rotating part with a smaller radial cross-sectional area is connected to the first end of the stretching member.

7. The tool for increasing the length of coiled tubing for cutting and salvaging according to claim 2, characterized in that: The rotating part is spherical, and the first chamber is provided with a ball socket.

8. The tool for increasing the length of coiled tubing for cutting and salvaging according to claim 2, characterized in that: The other end of the first connecting piece is provided with an external thread, and the inner wall of the second chamber is provided with an internal thread.

9. The tool for increasing the length of coiled tubing for cutting and salvaging according to any one of claims 1 to 8, characterized in that: Also includes; a fastener, the fastener being spaced apart from the second connecting member and being located at one side of the first end of the second connecting member; The fastener comprises a first through hole and a second through hole, the first through hole and the second through hole both pass through the fastener, and an axis of the first through hole is parallel to an axis of the second through hole; Among them, the second end of the stretching member penetrates from any one of the first through hole and the second through hole and passes through the fastener, and then penetrates again toward the fastener and from the other of the first through hole and the second through hole and passes through the fastener, so that the stretching member forms an annular structure on one side of the fastener to form the connecting portion.

10. The tool for increasing the length of coiled tubing for cutting and salvaging according to claim 9, characterized in that: The tensile member is a steel wire rope or a steel cable.

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