Coiled tubing retrievable cutting and fishing integrated tool

Abstract

This invention relates to the field of well workover tools in the petroleum industry, and discloses a retractable cutting and retrieval integrated tool for coiled tubing. It includes a guide shoe, a barrel, and an upper connector. The upper connector and guide shoe are respectively connected to both ends of the barrel. A retractable slip assembly and a cutting blade are sequentially arranged inside the barrel along the direction closest to the guide shoe. The retractable slip assembly includes a slip barrel and a basket slip. The outer surface of the basket slip has a reverse-rotation wide thread, and the inner wall of the slip barrel has an inner reverse-rotation wide thread. The inner reverse-rotation wide thread meshes with the reverse-rotation wide thread. The inner wall of the basket slip has a trapezoidal serrated thread, with the threads of the trapezoidal serrated thread inclined away from the cutting blade. The tail of the cutting blade is fitted inside the slip barrel. This tool integrates retrieval and cutting, enabling different operations depending on the condition of the coiled tubing to adapt to complex downhole environments. Furthermore, the retractable slip mechanism ensures the tool's retraction capability downhole.

Description

Technical Field

[0001] This invention relates to the field of well workover tools in the petroleum industry, specifically to an integrated tool for retractable coiled tubing cutting and retrieval. Background Technology

[0002] As an essential tool in oil, gas and water well workover operations, fishing tools play an important role in well workover operations and are commonly used for retrieving fish that have fallen into coiled tubing, pipes, rods and other similar equipment during accidents.

[0003] However, existing salvage tools have the following drawbacks:

[0004] 1. The designed tool has too short teeth for retrieving fish, and is a cage-type tool. It cannot withstand the long-distance friction of fish falling into the water during the retrieval process, which will easily damage the teeth and cause failure.

[0005] 2. The slip mechanism involved is non-retractable. If the shear slip fails, the tool cannot be released, ultimately causing the drill to jam.

[0006] 3. Due to the inability to safely discard the tool after failure, existing tools are generally unsuitable for use with work machines and through-hole oil pipes with low steel strength, thus affecting the progress of the process and increasing the difficulty of construction. Summary of the Invention

[0007] The purpose of this invention is to overcome the shortcomings of the prior art and provide a retractable cutting and fishing tool for coiled tubing, which integrates fishing and cutting and can perform different operations according to the condition of the coiled tubing to adapt to complex downhole environments. At the same time, the fishing slip mechanism is designed as a retractable slip mechanism to ensure the tool's retraction in the well.

[0008] The objective of this invention is achieved through the following technical solution: a retractable cutting and retrieval integrated tool for coiled tubing, comprising a guide shoe, a cylindrical body, and an upper connector. The upper connector and the guide shoe are respectively connected to both ends of the cylindrical body. A retractable slip assembly and a cutting blade are sequentially arranged inside the cylindrical body along the direction close to the guide shoe. The retractable slip assembly includes a slip cylinder and a basket slip. The outer surface of the basket slip is provided with a reverse-rotation wide thread, and the inner wall of the slip cylinder is provided with an inner reverse-rotation wide thread. The inner reverse-rotation wide thread meshes with the reverse-rotation wide thread. The inner wall of the basket slip is provided with a trapezoidal sawtooth thread, the threads of which face away from the cutting blade. The shearing cutter is tilted, and its tail is fitted into the slip cylinder. The slip cylinder is connected to the cylinder by multiple pins, which are staggered. The shearing cutter includes a blade cylinder, a blade-shaped cutting body, and a cutting blade. Multiple blade-shaped cutting bodies are fixed to one end of the blade cylinder away from the retractable slip assembly. The multiple blade-shaped cutting bodies are evenly distributed circumferentially around the center of the blade cylinder. The cutting blade is fixed to one end of the blade-shaped cutting body away from the blade cylinder. A tapered hole is provided at one end of the cylinder near the guide shoe. The diameter of the tapered hole gradually increases in the direction away from the guide shoe. The tapered hole is used to make the shearing cutter converge to cut the continuous tubing.

[0009] In some embodiments, the sidewall of the basket-type slip is provided with a plurality of longitudinal expansion and contraction grooves, which are evenly distributed along the axial direction of the basket-type slip.

[0010] In some embodiments, the sidewall of the cylinder is provided with a plurality of longitudinal keyways, each of which corresponds to a plurality of pins, and the pins are slidably adapted to fit within the longitudinal keyways.

[0011] In some embodiments, a first external threaded post is fixed to one end of the cylinder away from the upper connector. The first external threaded post is hollow, and a first internal threaded hole is opened at one end of the guide shoe. The thread of the first external threaded post is adapted to fit into the first internal threaded hole.

[0012] In some embodiments, a second external threaded post is fixed at one end of the upper connector near the cylinder. The second external threaded post is hollow, and a second internal threaded hole is opened at one end of the cylinder. The thread of the second external threaded post is adapted to fit into the second internal threaded hole.

[0013] In some embodiments, the blade body is provided with external threads, and the inner wall of the slip cylinder near one end of the cutting blade is provided with internal threads, and the external threads of the blade body are adapted to the internal threads of the slip cylinder.

[0014] In some embodiments, the cylinder is provided with a plurality of hydraulic jacks on the inner wall of the tapered hole, and the plurality of hydraulic jacks correspond one-to-one with the plurality of blade-shaped cutting bodies. The hydraulic jacks move radially along the cylinder, and the blade-shaped cutting bodies are located on the moving path of the hydraulic jacks.

[0015] In some embodiments, an annular hydraulic cavity is provided between the inner wall and the outer wall of the cylinder, and an installation hole is provided on the inner wall of the cylinder, which communicates with the tapered hole. The hydraulic jack is slidably adapted to the installation hole, and the installation hole is connected to the annular hydraulic cavity through a pressurization channel. A hydraulic interface is provided on the outer wall of the cylinder, and the hydraulic interface communicates with the annular hydraulic cavity.

[0016] In some embodiments, the mounting hole includes a large-diameter hole and a small-diameter hole, the two ends of the small-diameter hole are respectively connected to the large-diameter hole and the tapered hole, the hydraulic jack is adapted to be fitted in the small-diameter hole, the large-diameter hole is slidably fitted with a limit plate, and the hydraulic jack is fixedly connected to the limit plate.

[0017] In some embodiments, a first rubber sealing sleeve is fixed inside the large-diameter hole, and the limiting disc squeezes the first rubber sealing sleeve to deform and adapt to the large-diameter hole. A second rubber sealing sleeve is fixed inside the small-diameter hole, and the hydraulic jack squeezes the second rubber sealing sleeve to deform and adapt to the small-diameter hole.

[0018] The beneficial effects of this invention are:

[0019] 1. The salvage slip is designed as a basket slip with trapezoidal sawtooth threads inside. The trapezoidal sawtooth threads have a large contact area, good wrapping properties, and high strength.

[0020] 2. By meshing the internal reverse wide thread and the reverse wide thread, the retractable slip assembly can be withdrawn from the coiled tubing, making single-trip salvage operations more maneuverable and safer, and avoiding complex accidents such as stuck drill string caused by tool problems.

[0021] 3. Multiple pins are staggered to avoid stress concentration on a uniform base surface, which would affect the strength of the slip cylinder. At the same time, the force of multiple pins is dispersed, making shearing easier. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the internal structure of a retractable continuous tubing cutting and salvage integrated tool according to the present invention.

[0023] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0024] Figure 3 for Figure 1Enlarged view at point B in the middle;

[0025] In the diagram, 1-guide shoe, 2-cylinder body, 3-upper connector, 4-cutting blade, 5-slipper body, 6-basket slip, 7-reverse wide thread, 8-internal reverse wide thread, 9-trapezoidal sawtooth thread, 10-pin, 11-blade body, 12-blade cutter body, 13-cutting blade, 14-tapered hole, 15-longitudinal keyway, 16-first external thread post, 17-second external thread post, 18-hydraulic jack, 19-annular hydraulic chamber, 20-mounting hole, 21-pressurization channel, 22-hydraulic interface, 23-large diameter hole, 24-small diameter hole, 25-limiting plate, 26-first rubber sealing sleeve, 27-second rubber sealing sleeve, 28-longitudinal expansion groove. Detailed Implementation

[0026] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the following description.

[0027] like Figures 1 to 3As shown, a retractable cutting and fishing integrated tool for coiled tubing includes a guide shoe 1, a cylinder 2, and an upper connector 3. The upper connector 3 and the guide shoe 1 are respectively connected to the two ends of the cylinder 2. The upper connector 3 is threadedly connected to the fishing string. The tool is lowered into the well through the fishing string to retrieve the fish. Inside the cylinder 2, along the direction close to the guide shoe 1, a retractable slip assembly and a cutting blade 4 are arranged sequentially. The retractable slip assembly includes a slip cylinder 5 and a basket slip 6. The basket slip 6 is cylindrical in shape, resembling a basket. The outer surface of the basket slip 6 is provided with a reverse-rotation wide thread 7, which is a wide sawtooth left-hand thread. The inner wall of the slip cylinder 5 is provided with an inner reverse-rotation wide thread 8. The reverse-rotation wide thread 8 and the reverse-rotation wide thread 7 mesh properly. The inner wall of the basket slip 6 is provided with a trapezoidal sawtooth thread 9. The threads of the trapezoidal sawtooth thread 9 are inclined away from the shear cutter 4. The trapezoidal sawtooth thread 9 adopts a reverse-rotation thread design, which allows the coiled tubing to smoothly enter the basket slip 6. When the tool is lifted to pull the coiled tubing upward, the coiled tubing is gripped by the action of the trapezoidal sawtooth thread 9. The tail of the shear cutter 4 is fitted into the slip cylinder 5. The slip cylinder 5 is connected to the cylinder 2 by multiple pins 10. The multiple pins 10 are staggered. The staggered placement of the multiple pins 10 avoids stress concentration on a uniform base surface from affecting the strength of the slip cylinder, and also distributes the stress. The force of multiple pins is dispersed, facilitating cutting. The shearing cutter 4 includes a cutter body cylinder 11, blade-shaped cutting bodies 12, and a cutting blade 13. Multiple blade-shaped cutting bodies 12 are fixed to one end of the cutter body cylinder 11 away from the retractable slip assembly. The multiple blade-shaped cutting bodies 12 are evenly distributed circumferentially around the center of the cutter body cylinder 11. A cutting blade 13 is fixed to the end of the blade-shaped cutting bodies 12 away from the cutter body cylinder 11. A tapered hole 14 is opened at the end of the cylinder 2 near the guide shoe 1. The diameter of the tapered hole 14 gradually increases in the direction away from the guide shoe 1. The tapered hole 14 is used to make the shearing cutter 4 converge to cut the continuous oil pipe. A first external threaded post 16 is fixed to the end of the cylinder 2 away from the upper connector 3. The first external threaded post 16 is hollow, and one end of the guide shoe 1 has a first internal threaded hole. The thread of the first external threaded post 16 is adapted to fit into the first internal threaded hole. The upper connector 3 is fixed with a second external threaded post 17 near the end of the cylinder 2. The second external threaded post 17 is hollow, and one end of the cylinder 2 has a second internal threaded hole. The thread of the second external threaded post 17 is adapted to fit into the second internal threaded hole. The cylinder 2 and the upper connector 3, and the cylinder 2 and the guide shoe 1 are all connected by threads, which facilitates installation and disassembly. The side wall of the cylinder 2 has multiple longitudinal keyways 15, and the multiple longitudinal keyways 15 correspond one-to-one with multiple pins 10. The pins 10 slide and fit into the longitudinal keyways 15.The specific operation process is as follows: Before entering the well, connect the threaded end of the upper connector 3 to the threaded end of the upper fishing string, and check the placement of the pin 10. At the same time, tighten the threaded connection between the guide shoe 1 and the cylinder 2, and between the cylinder 2 and the upper connector 3. Then, lower the integrated tool. When the tool reaches the bottom of the well and encounters the top of the coiled tubing, intermittently rotate the fishing string and continue to lower it. Guide the fish head into the tool through the wall hook guide shoe at the bottom of the guide shoe 1, and then continue to lower the tubing, so that the coiled tubing passes through the shear cutter 4 and the retractable clamp. The inner cavity of the bearing assembly and upper connector 3 enters the upper retrieval string. When the retrieval string encounters resistance, it indicates that the tool has reached the lowest point of this cutting and retrieval operation. At this point, the retrieval string is lifted. During the lifting process, the basket slip 6 will grip the continuous tubing inside the cavity. Under the reverse force of the lifting force, the basket slip 6 will drive the slip cylinder 5 to move downward, thereby cutting the misaligned pin 10, and further driving the shearing cutter 4 connected below to move. As the shearing cutter 4 moves, in the conical shape of the cylinder 2... Under the internal conical structure of hole 14, the shearing cutter 4 will retract inward, converging inward to cut the coiled tubing inside the cavity. After the coiled tubing is cut, the fish string inside the well is brought out by the clamping action of the retractable slip assembly, completing the retrieval operation. If, after completing the operation, the lifting of the tubing string fails to complete the shearing, and multiple attempts to release the stuck tubing within the maximum range of the equipment are unsuccessful, it is determined that the downhole tool has failed to cut due to uncontrollable factors. In this case, the fish removal operation will be performed. The process involves lowering the fishing string, releasing the basket slips 6 from the coiled tubing inside the wellbore, and then rotating the fishing string clockwise. This rotation causes the entire tool to rotate, engaging the longitudinal keyway 15 on the inner wall of the tubing body 2 with the slip body 5. This causes the basket slips 6 to rotate clockwise along with the fishing string. Simultaneously, the fishing string is slowly lifted, and the reverse spiral teeth of the trapezoidal sawtooth thread 9 of the basket slips 6 gradually pull the tool out of the wellbore, completing the fish removal operation and safely retrieving the upper tubing string carrying the tool from the wellbore. This retraction capability ensures safety and allows for the use of lower-load rigs in complex coiled tubing operations, eliminating the problem of stuck tubing due to limited operating load. Furthermore, it offers advantages such as increased process options and reduced equipment costs. Preferably, the blade body 11 is provided with external threads, and the inner wall of the slip cylinder 5 near the end of the cutting blade 4 is provided with internal threads. The external threads of the blade body 11 are adapted to the internal threads of the slip cylinder 5, and the cutting blade 4 is connected to the retractable slip assembly by means of threaded connection.

[0028] In some embodiments, such as Figure 1 and Figure 2As shown, the side wall of the basket slip 6 is provided with multiple longitudinal expansion and contraction grooves 28. The multiple longitudinal expansion and contraction grooves 28 are evenly distributed along the axial direction of the basket slip 6. The longitudinal expansion and contraction grooves 28 penetrate the end of the basket slip 6 near the shear cutter 4, making the basket slip 6 resemble a spring clip. When the continuous oil tube enters the inner cavity of the cylinder 2, it can squeeze the basket slip 6 to expand outward, so that the continuous oil tube can pass smoothly through the basket slip 6.

[0029] In some embodiments, such as Figure 1 and Figure 3 As shown, the cylinder 2 has multiple hydraulic jacks 18 on the inner wall of the conical hole 14. Each hydraulic jack 18 corresponds to a multiple blade-shaped cutting body 12. The hydraulic jacks 18 move radially along the cylinder 2, and the blade-shaped cutting bodies 12 are located on the moving path of the hydraulic jacks 18. Since the size of the conical hole 14 cannot be designed to be too small, the minimum diameter of the conical hole 14 is larger than the diameter of the continuous oil pipe. It is necessary to ensure that the continuous oil pipe can pass smoothly through the conical hole 14. As a result, the conical surface of the conical hole 14 has a limited gathering effect on the blade-shaped cutting body 12, which leads to a weak cutting ability of the shearing cutter 5. It is easy to fail to cut the continuous oil pipe. For this reason, the hydraulic jacks 18 are designed. When the shearing of the shearing cutter 4 is obstructed, the hydraulic jacks 18 are activated. The hydraulic jacks 18 push the blade-shaped cutting body 12 to continue to retract inward, thereby improving the cutting ability of the shearing cutter 4 on the continuous oil pipe.

[0030] Furthermore, such as Figure 1 and Figure 3As shown, an annular hydraulic cavity 19 is provided between the inner and outer walls of the cylinder 2. An installation hole 20 is provided on the inner wall of the cylinder 2, communicating with a conical hole 14. A hydraulic jack 18 is slidably fitted within the installation hole 20. The installation hole 20 is connected to the annular hydraulic cavity 19 via a pressurization channel 21. A hydraulic interface 22 is provided on the outer wall of the cylinder 2, communicating with the annular hydraulic cavity 19. The installation hole 20 includes a large-diameter hole 23 and a small-diameter hole 24. The two ends of the small-diameter hole 24 are respectively connected to the large-diameter hole 23 and the conical hole 14. The hydraulic jack 18 is fitted within the small-diameter hole 24. A limit plate 25 is slidably fitted within the large-diameter hole 23. The hydraulic jack 18 is fixedly connected to the limit plate 25. The hydraulic interface 22 is connected to an external hydraulic device, through which hydraulic pressure is supplied to the annular hydraulic cavity 19. Hydraulic oil is injected into the hydraulic chamber 19 and flows into the mounting hole 20 through the pressurization channel 21 to push the hydraulic jack 18 closer to the blade body 12. The hydraulic jack 18 pushes the blade body 12 to continue to retract inward, causing the cutter 13 to continue to move inward for cutting. At the same time, the cutting force is enhanced, which can effectively cut the continuous oil pipe. The maximum lifting distance of the hydraulic jack 18 is controlled by the limit plate 25. When the limit plate 25 abuts against the step formed by the large diameter hole 23 and the small diameter hole 24, the hydraulic jack 18 will no longer be able to push the blade body 12 to retract inward, so as to avoid excessive deformation of the blade body 12 and damage to the cutting blade 4. When the hydraulic jack 18 is lifted to the maximum distance but still cannot cut the continuous oil pipe, the above-mentioned fish retraction operation is performed.

[0031] In some embodiments, such as Figure 3 As shown, a first rubber sealing sleeve 26 is fixed inside the large-diameter hole 23. The limiting plate 25 squeezes the first rubber sealing sleeve 26 to deform and adapt to the large-diameter hole 23. A second rubber sealing sleeve 27 is fixed inside the small-diameter hole 24. The hydraulic jack 18 squeezes the second rubber sealing sleeve 27 to deform and adapt to the small-diameter hole 24. The first rubber sealing sleeve 26 improves the sealing strength between the limiting plate 25 and the large-diameter hole 23, and the second rubber sealing sleeve 27 improves the sealing strength between the hydraulic jack 18 and the small-diameter hole 24. Thus, the sealing performance is guaranteed by the combined action of the first rubber sealing sleeve 26 and the second rubber sealing sleeve 27, and the stability of the hydraulic push is maintained. This generates a strong hydraulic force on the hydraulic jack 18 to enhance the cutting ability of the shearing blade 4.

[0032] In the description of this invention, it should be understood that the terms "coaxial," "bottom," "one end," "top," "middle," "other end," "upper," "side," "top," "inner," "front," "center," and "both ends," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention. Furthermore, those skilled in the art will understand that the beneficial effects to be achieved by this invention are merely to achieve better beneficial effects compared with the current embodiments in the prior art under specific conditions, rather than to directly achieve the best use effect in the industry.

[0033] The above description is merely a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the concept described herein through the above teachings or related technologies or knowledge. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A retractable continuous tubing cutting and retrieval integrated tool, comprising a guide shoe (1), a cylindrical body (2), and an upper connector (3), wherein the upper connector (3) and the guide shoe (1) are respectively connected to both ends of the cylindrical body (2), characterized in that, Inside the cylinder (2), along the direction close to the guide shoe (1), a retractable slip assembly and a cutting blade (4) are sequentially arranged. The retractable slip assembly includes a slip cylinder (5) and a basket slip (6). The outer surface of the basket slip (6) is provided with a reverse-rotation wide thread (7), and the inner wall of the slip cylinder (5) is provided with an inner reverse-rotation wide thread (8). The inner reverse-rotation wide thread (8) meshes with the reverse-rotation wide thread (7). The inner wall of the basket slip (6) is open. The device is provided with a trapezoidal sawtooth thread (9), the threads of which are inclined away from the shearing cutter (4). The tail of the shearing cutter (4) is fitted inside the slip cylinder (5). The slip cylinder (5) is connected to the cylinder (2) by multiple pins (10), which are staggered. The shearing cutter (4) includes a blade cylinder (11), a blade-shaped cutting body (12), and a cutting blade (13). 1) A plurality of blade-shaped cutter bodies (12) are fixed at one end away from the retractable slip assembly. The plurality of blade-shaped cutter bodies (12) are evenly distributed circumferentially around the center of the cutter body cylinder (11). A cutter (13) is fixed at one end of the blade-shaped cutter body (12) away from the cutter body cylinder (11). A conical hole (14) is provided at one end of the cylinder (2) near the guide shoe (1). The diameter of the conical hole (14) is along the direction away from the guide shoe (1). As the diameter gradually increases, the tapered hole (14) is used to bring the shearing cutter (4) into a converged state to cut the continuous oil pipe. The cylinder (2) is provided with a plurality of hydraulic jacks (18) on the inner wall of the tapered hole (14). The plurality of hydraulic jacks (18) correspond one-to-one with the plurality of blade-shaped cutter bodies (12). The hydraulic jacks (18) move radially along the cylinder (2), and the blade-shaped cutter bodies (12) are located on the moving path of the hydraulic jacks (18).

2. The retractable cutting and salvage integrated tool for coiled tubing according to claim 1, characterized in that, The sidewall of the basket slip (6) is provided with a plurality of longitudinal expansion and contraction grooves (28), which are evenly distributed along the axial direction of the basket slip (6).

3. The retractable cutting and salvage integrated tool for coiled tubing according to claim 1, characterized in that, The side wall of the cylinder (2) is provided with a plurality of longitudinal keyways (15), and the plurality of longitudinal keyways (15) correspond one-to-one with the plurality of pins (10), and the pins (10) slide to fit within the longitudinal keyways (15).

4. The retractable cutting and salvage integrated tool for coiled tubing according to claim 1, characterized in that, The cylinder (2) is fixed with a first external thread post (16) at one end away from the upper connector (3). The first external thread post (16) is hollow. The guide shoe (1) has a first internal thread hole at one end. The thread of the first external thread post (16) is adapted to the first internal thread hole.

5. The retractable cutting and salvage integrated tool for coiled tubing according to claim 4, characterized in that, The upper connector (3) is fixed with a second external threaded post (17) at one end near the cylinder (2). The second external threaded post (17) is hollow. A second internal threaded hole is opened at one end of the cylinder (2). The thread of the second external threaded post (17) is adapted to the second internal threaded hole.

6. The retractable cutting and salvage integrated tool for coiled tubing according to claim 5, characterized in that, The blade body cylinder (11) is provided with external threads, and the inner wall of the slip cylinder (5) near the end of the cutting blade (4) is provided with internal threads. The external threads of the blade body cylinder (11) are adapted to the internal threads of the slip cylinder (5).

7. The retractable cutting and salvage integrated tool for coiled tubing according to claim 1, characterized in that, An annular hydraulic cavity (19) is provided between the inner wall and the outer wall of the cylinder (2). An installation hole (20) is provided on the inner wall of the cylinder (2). The installation hole (20) communicates with the tapered hole (14). The hydraulic jack (18) is slidably fitted into the installation hole (20). The installation hole (20) is connected to the annular hydraulic cavity (19) through a pressurization channel (21). A hydraulic interface (22) is provided on the outer wall of the cylinder (2). The hydraulic interface (22) communicates with the annular hydraulic cavity (19).

8. The retractable cutting and salvage integrated tool for coiled tubing according to claim 7, characterized in that, The mounting hole (20) includes a large-diameter hole (23) and a small-diameter hole (24). The two ends of the small-diameter hole (24) are respectively connected to the large-diameter hole (23) and the tapered hole (14). The hydraulic jack (18) is adapted to the small-diameter hole (24). The large-diameter hole (23) is slidably adapted to the limiting plate (25). The hydraulic jack (18) is fixedly connected to the limiting plate (25).

9. The retractable cutting and salvage integrated tool for coiled tubing according to claim 8, characterized in that, A first rubber sealing sleeve (26) is fixed inside the large-diameter hole (23). The limiting disc (25) squeezes the first rubber sealing sleeve (26) to deform and adapt to the large-diameter hole (23). A second rubber sealing sleeve (27) is fixed inside the small-diameter hole (24). The hydraulic jack (18) squeezes the second rubber sealing sleeve (27) to deform and adapt to the small-diameter hole (24).

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