Fishing tool and method for lifting down coiled tubing for rotating operation
By designing a rotating tool that uses a screw rotor to drive the slip retrieval cylinder and the window guide shoe, the problem of uncontrollable rotation of downhole tools and difficulty in catching fish in coiled tubing retrieval operations was solved, thus improving the retrieval success rate and operational controllability.
Patent Information
- Application Number
- CN202410655600.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-24
- Publication Date
- 2025-11-25
AI Technical Summary
In existing technologies, during coiled tubing retrieval operations, the downhole tool string cannot be rotated in a controllable manner, the coiled tubing has poor centering within the casing, the retrieval tools are not securely held and are prone to slipping, and it is difficult to retrieve fish when the wellbore is narrowed.
Design a fishing tool including a screw device, an upper shell, a screw rotor, a unidirectional rotation device, a slipper scooping tube, and a window guide shoe device. The screw rotor drives the slipper scooping tube and the window guide shoe to rotate, realizing the rotation operation of the continuous tubing. The mechanical claw gripping and limiting structure of the slipper scooping tube ensures the firm grasping of the fallen fish.
It improves the success rate of coiled tubing retrieval operations, prevents slippage, simplifies the controllable rotation of downhole tools and the judgment of fish introduction, and adapts to retrieval under conditions of reduced wellbore diameter.
Smart Images
Figure CN121006948A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of oil and gas field development, specifically to a salvage tool and method for rotating coiled tubing. Background Technology
[0002] Coiled tubing technology is safe, environmentally friendly, fast, and efficient, and is now widely used in various fields of oil and gas development. However, tubing string breakage is a frequent occurrence during coiled tubing operations, necessitating retrieval of the fallen tubing. Using on-site coiled tubing equipment for direct retrieval is undoubtedly the first choice, and the retrieval tool, as the core component of the retrieval operation, is crucial to its success. Compared to conventional tubing strings, current coiled tubing retrieval methods face the following main problems: First, the coiled tubing has poor centering within the casing. The top of the fallen tubing, such as the tubing to be retrieved, is usually off-axis and obliquely attached to the inner wall of the casing, making it difficult for conventional guide shoes to smoothly guide it in. Second, because coiled tubing lacks couplings, even if successfully guided into the retrieval tool, slippage often occurs due to insufficient clamping. Third, because coiled tubing cannot rotate, conventional retrieval tools typically only allow for lifting and lowering the tubing string, resulting in a limited retrieval method and severely impacting the success rate of the retrieval operation. When using a low-speed downhole motor for rotary fishing, pumping operations are required. In actual operation, speed control is difficult, severely impacting the fishing process, and the overall performance needs further improvement. Fourth, when there is a narrowing in the wellbore, conventional coiled tubing fishing tools struggle to retrieve fish below the narrowing point. Currently, there is no efficient fishing tool that uses coiled tubing for rotary operations. Summary of the Invention
[0003] In order to overcome the defects of the prior art, the present invention aims to provide a fishing tool and method for rotating coiled tubing during fishing operations, so as to solve the technical problems of the inability to controllably rotate the downhole tool string and the inability to fish out the coiled tubing after the wellbore has narrowed in diameter when using coiled tubing for fishing operations in the prior art.
[0004] This invention is achieved through the following technical solution:
[0005] In a first aspect, the present invention provides a retrieval tool for rotating a coiled tubing, comprising a screw assembly, an upper housing, a screw rotor, a lower housing, a one-way rotation device, a slipper retrieval tube, a window-opening guide shoe device, and a central connector; one end of the screw assembly is connected to the upper tool, the upper tool is connected to the coiled tubing, the other end of the screw assembly extends into the upper housing, the upper housing is connected to the central connector, the screw rotor is fitted into the central connector, and one end of the screw rotor is rotatably connected to the screw assembly inside the upper housing, and the other end is rotatably connected to the lower housing; the one-way rotation device is disposed inside the lower housing; one end of the slipper retrieval tube is rotatably connected to the one-way rotation device, and the other end is connected to the window-opening guide shoe device.
[0006] Preferably, the screw assembly includes a connecting end, a polished rod, and a screw. The connecting end is located outside the upper housing, and one side of the connecting end is connected to a continuous oil pipe via an upper tool. One end of the polished rod is fixedly disposed on the other side of the connecting end. The screw is disposed at the other end of the polished rod and is integrally formed with the polished rod. The screw extends along the upper housing into the middle joint and is rotatably connected to the screw rotor.
[0007] Furthermore, the outer diameters of the smooth rod and the screw are equal, and they are coaxially arranged.
[0008] Furthermore, there is a gap between the inner wall of the upper housing and the guide rod and the screw, wherein a sealing device is provided on the inner wall of the upper housing near the connecting end, and the sealing device is sleeved between the guide rod and the upper housing.
[0009] Furthermore, a piston is fitted between the guide rod and the screw, and the piston is located in the gap between the inner wall of the upper housing and the guide rod and the screw, which is used to limit and straighten the guide rod and the screw axially; a return spring is fitted on the screw, and the return spring is located in the gap between the inner wall of the upper housing and the screw, one end of the return spring abuts against the piston and the other end abuts against the middle joint, which is used to straighten the screw, reduce impact and stabilize the screw speed.
[0010] Preferably, the inner ring of the unidirectional rotating device is coaxially connected to the screw rotor via a keyway, and the unidirectional rotating device is provided with unidirectional helical teeth for preventing reverse rotation.
[0011] Preferably, the scooping tube is installed on the unidirectional rotating device via a threaded connection. The scooping tube has several mechanical claws on the side near the window-opening guide shoe device for grabbing the fish to be scooped. Inside the scooping tube, from the window-opening guide shoe device to the unidirectional rotating device, there are a first step, a second step, and a third step, which are used to guide the fish to be scooped into the scooping tube and make contact with the first step, the second step, and the third step in sequence, causing a change in suspension weight to determine the position of the fish to be scooped in the scooping tube.
[0012] Preferably, the shoe-guiding device includes a blade and a blade edge. The blade is a hollow structure, and the hollow structure is the guiding area, which is connected to the slipper scooping tube. The blade has an opening, and the opening has an upper limit protrusion and a lower limit protrusion. The blade edge is located at the end of the blade.
[0013] Furthermore, the distance between the upper limit protrusion and the lower limit protrusion is greater than the diameter of the fish to be retrieved, while the distance between the blade and the lower limit protrusion is less than the diameter of the fish to be retrieved.
[0014] Secondly, the present invention also provides a salvage method for lifting and rotating coiled tubing, based on the salvage tool described above for lifting and rotating coiled tubing, comprising the following processes:
[0015] The coiled tubing, carrying the retrieval tool, is lowered into the well. Upon contact with the fallen fish, the piston, under axial load, compresses the return spring and pushes the screw downwards. This sequentially rotates the screw rotor, the one-way rotating device, the slip retrieval tube, and the window-opening guide shoe device, guiding the coiled tubing into the cavity of the window-opening guide shoe device. The coiled tubing continues downwards, guiding the fish to be retrieved into the cavity of the slip retrieval tube. When the fish first enters the slip retrieval tube, the contact between the top of the fish and the step position causes a change in the suspended weight. Surface operators monitor this change in suspended weight. Confirm whether the fish has entered the slip retrieval tube; as the top of the fish continues to enter the limit point in the middle of the slip retrieval tube, the suspended weight decreases, and the ground operator can judge the situation by observing the change in suspended weight; after confirming that the fish has entered the limit point in the middle of the slip retrieval tube, the ground operator pulls up the coiled tubing and judges the retrieval status based on the suspended weight of the injection head; after confirming successful retrieval, continue to pull up steadily until it is brought out of the wellhead; if the retrieval is unsuccessful, pull up the coiled tubing, after the axial load is released, the return spring retracts, the piston returns to the starting position, and the above operation is repeated.
[0016] Compared with the prior art, the present invention has the following beneficial technical effects:
[0017] This invention provides a retrieval tool for rotating a coiled tubing. One end of a screw assembly is connected to an upper tool, which is connected to the coiled tubing. The other end of the screw assembly extends into an upper housing, which is connected to a middle connector. A screw rotor is fitted into the middle connector, with one end of the rotor rotatably connected to the screw assembly inside the upper housing and the other end rotatably connected to a lower housing. A one-way rotation device is located inside the lower housing. One end of a slipper retrieval cylinder is rotatably connected to the one-way rotation device, and the other end is connected to a window-opening guide shoe device. The screw... One end of the rotor is rotatably connected to the screw device inside the upper housing, which drives the lower housing, the one-way rotation device, the slip retrieval tube, and the window-opening guide shoe device to rotate. This solves the problem of the downhole tool string being unable to rotate controllably when using coiled tubing for retrieval operations. At the same time, the design of the slip retrieval tube allows it to firmly grasp the fish to be retrieved and facilitates the judgment of the retrieval situation by the surface operators. In addition, the fish to be retrieved can be quickly removed after the retrieval operation is completed, which improves the success rate of introducing the fish to be retrieved, prevents coiled tubing slippage, and effectively improves the success rate of coiled tubing retrieval operations.
[0018] Furthermore, the inner ring of the unidirectional rotating device is coaxially keyway connected to the screw rotor and connected to the slipper scooping cylinder. The unidirectional rotating device is surrounded by helical teeth in the same direction. The unidirectional rotating device can drive the slipper scooping cylinder and the window-type guide shoe to rotate clockwise. It has an anti-reverse function. During the process of the screw device returning to the starting position, the slipper scooping cylinder and the window-type guide shoe do not rotate.
[0019] Furthermore, the scooping tube is installed on the one-way rotating device via a threaded connection. The scooping tube has several mechanical claws near the window-opening guide shoe device to grab the fish to be retrieved. By pressing down, the fish, such as the coiled tubing, is pushed into the scooping tube. The high-strength and high-toughness scoops can firmly grip and lock the coiled tubing. Inside the scooping tube, from the window-opening guide shoe device to the one-way rotating device, there are a first step, a second step, and a third step, which are used to determine the position of the fish to be retrieved inside the scooping tube. The first step, the second step, and the third step allow ground operators to judge the situation of the fish entering the scooping tube by the change of the suspended weight.
[0020] Furthermore, the window-opening shoe-guiding device includes a blade and a cutting edge. The blade is hollow, and the hollow structure serves as the introduction area, communicating with the scooping tube. The blade has an opening with an upper limit protrusion and a lower limit protrusion. The cutting edge is located at the end of the blade. The distance between the upper and lower limit protrusions is greater than the diameter of the fish to be retrieved, facilitating the smooth entry of the continuous oil tubing into the cavity by the cutting edge. The distance between the cutting edge and the lower limit protrusion is less than the diameter of the fish to be retrieved, limiting the continuous oil tubing and other fish entering the cavity and preventing them from accidentally detaching. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the salvage tool in this invention;
[0022] Figure 2 This is a schematic diagram of the unidirectional rotation device in this invention;
[0023] Figure 3 This is a schematic diagram of the structure of the slip-type scooping cylinder in this invention;
[0024] Figure 4 This is a schematic diagram of the shoe-guiding device with a window in this invention;
[0025] In the diagram: 1-Screw assembly; 2-Upper housing; 3-Piston; 4-Screw rotor; 5-Lower housing; 6-One-way rotation device; 7-Cladle scoop; 8-Window-opening shoe guide device; 9-Sealing device; 10-Return spring; 11-Middle joint; 12-Smooth rod; 13-Screw; 71-Mechanical claw; 72-First step; 73-Second step; 74-Third step; 81-Cut body; 82-Cut edge; 83-Introduction area. Detailed Implementation
[0026] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.
[0027] The present invention will now be described in further detail with reference to the accompanying drawings:
[0028] The purpose of this invention is to provide a fishing tool and method for rotating coiled tubing during fishing operations, in order to solve the technical problems in the prior art where the downhole tool string cannot be rotated in a controllable manner and the coiled tubing to be fished cannot be retrieved after the wellbore diameter is reduced.
[0029] Example 1
[0030] See Figure 1In one embodiment of the present invention, a retrieval tool for rotating a coiled tubing is provided, comprising a screw assembly 1, an upper housing 2, a screw rotor 4, a lower housing 5, a one-way rotation device 6, a slipper retrieval tube 7, a window-opening guide shoe device 8, and a central connector 11; one end of the screw assembly 1 is connected to the upper tool, the upper tool is connected to the coiled tubing, the other end of the screw assembly 1 extends into the upper housing 2, the upper housing 2 is connected to the central connector 11, the screw rotor 4 is fitted into the central connector 11, and one end of the screw rotor 4 is rotatably connected to the screw assembly in the upper housing 2, and the other end is rotatably connected to the lower housing 5, the one-way rotation device 6 is disposed in the lower housing 5, one end of the slipper retrieval tube 7 is rotatably connected to the one-way rotation device 6, and the other end is connected to the window-opening guide shoe device 8.
[0031] Specifically, the screw assembly 1 includes a connecting end, a polished rod 12, and a screw 13. The connecting end is located outside the upper housing 2, and one side of the connecting end is connected to a continuous oil pipe through an upper tool. One end of the polished rod 12 is fixedly set on the other side of the connecting end. The screw 13 is set on the other end of the polished rod 12 and is integral with the polished rod 12. The screw 13 extends along the upper housing 2 into the middle connector 11 and is rotatably connected to the screw rotor 4.
[0032] The outer diameters of the smooth rod 12 and the screw 13 are equal, and they are coaxially arranged.
[0033] Specifically, there is a gap between the inner wall of the upper housing 2 and the smooth rod 12 and the screw 13. The inner wall of the upper housing 2 near the connecting end is provided with a sealing device 9, which is sleeved between the smooth rod 12 and the upper housing 2.
[0034] A piston 3 is fitted between the guide rod 12 and the screw 13. The piston 3 is located in the gap between the inner wall of the upper housing 2 and the guide rod 12 and the screw 13, and is used to limit and straighten the guide rod 12 and the screw 13 axially. A return spring 10 is fitted on the screw 13. The return spring 10 is located in the gap between the inner wall of the upper housing 2 and the screw 13. One end of the return spring 10 abuts against the piston 3 and the other end abuts against the middle joint 11, and is used to straighten the screw 13, reduce impact, and stabilize the rotation speed of the screw 13.
[0035] In this invention, the length of the polished rod matches the length of the upper housing, and the length of the screw matches the compression stroke of the return spring. One end of the upper housing near the screw assembly 1 is sealed to the polished rod 12 of the screw assembly via a sealing device 9, while the other end connects to the central connector 11, protecting the moving parts such as the return spring and piston. The piston 3 is axially fixed between the polished rod 12 and the screw 13 of the screw assembly 1, providing axial limiting and alignment for the screw assembly 1. The sealing device 9 at the top forms a dynamic seal with the inner cavity of the upper housing, and the piston's stroke is the same as the return spring's compression stroke. During the downward movement of the coiled tubing, the axial downward pressure drives the top screw assembly to compress the piston and return spring, pushing the lower screw downward. During the upward movement of the coiled tubing, the axial upward pulling force of the screw assembly drives the piston upward, the return spring returns to its original position, and the screw moves upward.
[0036] Specifically, the inner ring of the unidirectional rotating device 6 is coaxially keyway connected to the screw rotor 4, and the unidirectional rotating device 6 is surrounded by helical teeth in the same direction, such as... Figure 2 As shown, it is used for anti-reverse function.
[0037] In this invention, the screw rotor is axially limited between the central joint and the built-in bearing of the one-way rotation device, and is used in conjunction with the screw 13 to convert the axial movement of the piston 3 and the screw 13 into rotation, driving the inner ring of the one-way rotation device 6 to rotate. During the downward movement of the coiled tubing, the screw 13 moves downward and the screw rotor 4 rotates clockwise; during the upward movement of the coiled tubing, the screw moves upward and the screw rotor 4 rotates counterclockwise.
[0038] In this invention, the lower housing and the middle connector are connected, and a one-way rotation device is provided inside to prevent impurities from entering the device. A bearing is installed between the upper and lower housings, which limits the return spring and the screw rotor while simultaneously controlling the contact point with the screw rotor, allowing unrestricted rotation of the screw rotor. Its length matches the length of the screw, allowing the screw portion to retract into the inner cavity during lifting.
[0039] Specifically, the Kawa fishing tube 7 is connected to the one-way rotating device 6 via a threaded connection. The Kawa fishing tube 7 has several mechanical claws 71 near the window-opening guide shoe device 8 for grabbing the fish to be retrieved. Inside the Kawa fishing tube 7, from the window-opening guide shoe device 8 to the one-way rotating device 6, there are sequentially arranged first steps 72, second steps 73, and third steps 74. These steps guide the fish to be retrieved into the Kawa fishing tube 7, causing it to sequentially contact the first step 72, second step 73, and third step 74, resulting in a change in suspension weight. This allows the position of the fish within the Kawa fishing tube 7 to be determined. Figure 3 As shown.
[0040] Specifically, the shoe-guiding device includes a blade 81 and a blade edge 82. The blade 81 is a hollow structure, and the hollow structure forms the guiding area 83, which communicates with the slipper scooping cylinder 7. The blade 81 has an opening, and the opening has an upper limit protrusion 84 and a lower limit protrusion 85. The blade edge 82 is located at the end of the blade 81. Figure 4 As shown.
[0041] Among them, the distance between the upper limit protrusion structure 84 and the lower limit protrusion structure 85 is greater than the diameter of the fish to be retrieved, and the distance between the blade 82 and the lower limit protrusion structure 85 is less than the diameter of the fish to be retrieved.
[0042] Example 2
[0043] This invention provides a method for salvaging a coiled tubing by lifting it up and rotating it. The process is as follows: in this invention, the method involves salvaging the coiled tubing while simultaneously salvaging the fish that has fallen into the tubing.
[0044] 1. Based on the required outer diameter and expected weight of the fish to be retrieved, the outer diameter and length of the Kawa fishing tube are optimized. The optimal parameters are shown in Table 1:
[0045] Table 1. Preferred Specifications and Dimensions of the Kava Fishing Tube
[0046] The outer diameter of the fish that fell into the water needs to be retrieved. Kava outer diameter Kava length Kava theory can lift force inch inch inch ton 15 / 16-1 1 1 / 16 1.85 23.25 15 1 3 / 16-1 1 15 / 16 2.125 23.5 25 1 7 / 16-1 1 9 / 16 2.25 23.5 33.5 1 7 / 8-2 1 / 16 2.625 24.5 30 2-2 3 / 16 3.25 25.5 60 2 3 / 8-2 5 / 8 3.8 25.75 70 2 7 / 8-3 1 / 8 4.5 26.5 69
[0047] 2. Based on the selected specifications of the slipper barrel and the inner diameter of the casing (dimension of the reduced diameter section), the outer diameter and length of the guide shoe are optimized, as shown in Table 2:
[0048] Table 2 Optimal Length of Shoe Opening for Window
[0049]
[0050]
[0051] 3. Determine the specifications and dimensions of the screw assembly required for the operation based on the specifications of the coiled tubing used for salvage.
[0052] 4. Connect the screw assembly, slipper scooping cylinder and window-opening shoe guide assembly in sequence from top to bottom. Add conversion connectors if necessary.
[0053] 5. After the tool string is checked and found to be normal, the coiled tubing carrying the fishing tool is lowered into the well. After contacting the fish, the piston compresses the return spring under the axial load and pushes the screw downward, which drives the screw rotor + one-way rotation device + slip fishing tube + window guide shoe to rotate, and introduces the coiled tubing into the window guide shoe cavity.
[0054] 6. The coiled tubing continues to descend, guiding the fish to be retrieved into the colander's retrieval chamber. Just as the fish enters the colander's retrieval chamber ( Figure 3The contact between the top of the fish and the step (72) will cause a certain change in the suspended weight. Ground operators can use the change in suspended weight to confirm whether the fish has entered the scooping tube.
[0055] 7. As the fish continues to move towards the limit point in the middle of the scooping tube ( Figure 3 In the second step (73), the suspended weight will be significantly reduced, and ground operators can judge the situation by observing the changes in suspended weight.
[0056] 8. Ground operators confirm that the fish has entered the limiting position in the middle of the scooping tube. Figure 3 After the third step (74), the coiled tubing is pulled up, and the retrieval status is determined based on the suspended weight of the injection head. Once successful retrieval is confirmed, the tubing is continuously and steadily pulled up until it is brought out of the wellhead.
[0057] 9. If salvage is unsuccessful, raise the coiled tubing. After the axial load is released, the return spring will retract, and the piston will return to the starting position. Repeat the above operation.
[0058] 10. After the retrieval operation is completed, remove the window guide shoe and screw-type rotating device in sequence. At this time, the fish will remain in the retrieval tube.
[0059] 11. Use tools to vibrate the internal components of the collet auger ( Figure 3 While pulling the fish down on the third step (74), the fish can be removed from the scooping tube.
[0060] In summary, this invention provides a retrieval tool for rotating a coiled tubing. One end of a screw assembly is connected to an upper tool, which is connected to the coiled tubing. The other end of the screw assembly extends into an upper housing, which is connected to a middle connector. A screw rotor is fitted into the middle connector, with one end of the rotor rotatably connected to the screw assembly inside the upper housing and the other end rotatably connected to the lower housing. A one-way rotation device is located inside the lower housing. One end of a slipper retrieval cylinder is rotatably connected to the one-way rotation device, and the other end is connected to a window-opening guide shoe device. The screw... One end of the rod rotor is rotatably connected to the screw device inside the upper housing, driving the lower housing, unidirectional rotation device, slip retrieval tube, and window-opening guide shoe device to rotate. This solves the problem of uncontrollable rotation of the downhole tool string when using coiled tubing for retrieval operations. At the same time, the design of the slip retrieval tube allows it to firmly grasp the fish to be retrieved and facilitates the judgment of the retrieval situation by the surface operators. In addition, after the retrieval operation is completed, the fish can be quickly removed from the retrieval tool, improving the success rate of introducing the fish to be retrieved, preventing coiled tubing slippage, and effectively improving the success rate of coiled tubing retrieval operations.
[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.
Claims
1. A salvage tool for raising and rotating coiled tubing, characterized in that, The device includes a screw assembly (1), an upper housing (2), a screw rotor (4), a lower housing (5), a one-way rotating device (6), a slipper scooping tube (7), a window-opening shoe guide device (8), and a middle connector (11). One end of the screw assembly (1) is connected to the upper tool, which is connected to a continuous oil pipe. The other end of the screw assembly (1) extends into the upper housing (2). The upper housing (2) is connected to the middle connector (11). The screw rotor (4) is fitted into the middle connector (11). One end of the screw rotor (4) is rotatably connected to the screw assembly in the upper housing (2), and the other end is rotatably connected to the lower housing (5). The one-way rotating device (6) is located in the lower housing (5). One end of the slipper scooping tube (7) is rotatably connected to the one-way rotating device (6), and the other end is connected to the window-opening shoe guide device (8).
2. The salvage tool for lifting and rotating coiled tubing according to claim 1, characterized in that, The screw device (1) includes a connecting end, a polished rod (12) and a screw (13). The connecting end is located outside the upper housing (2), and one side of the connecting end is connected to a continuous oil pipe through an upper tool. One end of the polished rod (12) is fixedly set on the other side of the connecting end. The screw (13) is set on the other end of the polished rod (12) and is integral with the polished rod (12). The screw (13) extends along the upper housing (2) into the middle connector (11) and is rotatably connected to the screw rotor (4).
3. The salvage tool for lifting and rotating coiled tubing according to claim 2, characterized in that, The outer diameters of the optical rod (12) and the screw (13) are equal and they are coaxially arranged.
4. The salvage tool for lifting and rotating coiled tubing according to claim 3, characterized in that, There is a gap between the inner wall of the upper housing (2) and the light rod (12) and the screw (13). The inner wall of the upper housing (2) near the connection end is provided with a sealing device (9), which is sleeved between the light rod (12) and the upper housing (2).
5. A salvage tool for lifting and rotating coiled tubing according to claim 4, characterized in that, A piston (3) is fitted between the guide rod (12) and the screw (13). The piston (3) is located in the gap between the inner wall of the upper housing (2) and the guide rod (12) and the screw (13), and is used to limit and straighten the guide rod (12) and the screw (13) axially. A return spring (10) is fitted on the screw (13). The return spring (10) is located in the gap between the inner wall of the upper housing (2) and the screw (13). One end of the return spring (10) abuts against the piston (3) and the other end abuts against the middle joint (11), and is used to straighten the screw (13), reduce impact, and stabilize the rotation speed of the screw (13).
6. The salvage tool for lifting and rotating coiled tubing according to claim 1, characterized in that, The inner ring of the unidirectional rotating device (6) is coaxially connected to the screw rotor (4) via a keyway. The unidirectional rotating device (6) is surrounded by helical teeth in the same direction for preventing reverse rotation.
7. A salvage tool for lifting and rotating coiled tubing according to claim 1, characterized in that, The scooping tube (7) is set on the one-way rotating device (6) by a threaded connection. The scooping tube (7) is provided with several mechanical claws (71) on the side near the window-opening shoe-guiding device (8) for grabbing the fish to be caught. Inside the scooping tube (7), from the window-opening shoe-guiding device (8) to the one-way rotating device (6), there are a first step (72), a second step (73) and a third step (74) in sequence. These are used to guide the fish to be caught into the scooping tube (7) and make contact with the first step (72), the second step (73) and the third step (74) in sequence to produce a change in suspension weight, thereby determining the position of the fish to be caught inside the scooping tube (7).
8. A salvage tool for lifting and rotating coiled tubing according to claim 1, characterized in that, The opening shoe guide device (8) includes a blade (81) and a blade edge (82). The blade (81) is a hollow structure, and the hollow structure is the introduction area (83), which is connected to the slip tube (7). The blade (81) has an opening, and the opening has an upper limit protrusion structure (84) and a lower limit protrusion structure (85). The blade edge (82) is located at the end of the blade (81).
9. A salvage tool for lifting and rotating coiled tubing according to claim 8, characterized in that, The distance between the upper limit protrusion structure (84) and the lower limit protrusion structure (85) is greater than the diameter of the fish to be retrieved, and the distance between the blade (82) and the lower limit protrusion structure (85) is less than the diameter of the fish to be retrieved.
10. A salvage method for raising and rotating coiled tubing, characterized in that, A salvage tool for lifting and rotating coiled tubing according to any one of claims 1-9 comprises the following process: The coiled tubing, carrying the fishing tool, enters the well. Upon contact with the fallen fish, under the axial load, the piston (3) compresses the return spring (10) and pushes the screw (13) downwards. This sequentially drives the screw rotor (4), the one-way rotating device (6), the slip fishing tube (7), and the window-opening guide shoe device (8) to rotate, guiding the coiled tubing into the cavity of the window-opening guide shoe device (8). The coiled tubing continues to descend, guiding the fallen fish to be fished into the cavity of the slip fishing tube (7). When the fallen fish just enters the slip fishing tube (7), the contact between the top of the fish and the step position will cause a change in the suspended weight. The operator confirms whether the fish has entered the slip retrieval tube (7) by observing the change in suspended weight. As the top of the fish continues to enter the limit position in the middle of the slip retrieval tube (7), the suspended weight decreases, and the ground operator makes a judgment based on the change in suspended weight. After the ground operator confirms that the fish has entered the limit position in the middle of the slip retrieval tube (7), the coiled tubing is lifted, and the retrieval status is determined based on the suspended weight of the injection head. After confirming successful retrieval, the coiled tubing is continuously and steadily lifted until it is brought out of the wellhead. If the retrieval is unsuccessful, the coiled tubing is lifted, the axial load is released, the return spring (10) is retracted, the piston returns to the starting position, and the above operation is repeated.