Anchoring shoe production string internal cutting tool

Abstract

The invention relates to the technical field of oil pipe cutting, in particular to an anchoring shoe type production pipe column inner cutting tool which comprises an anchoring body, an anchoring mechanism arranged on the anchoring body, an anchoring driving mechanism, a rotating mechanism and a screwing-out mechanism. The anchoring mechanism comprises a plurality of anchoring pieces distributed in the circumferential direction of the anchoring body, each anchoring piece comprises a fixed part, a movable part and an anchoring shoe, the fixed parts are fixedly arranged on the anchoring body, the movable parts are movably arranged in the direction close to the fixed parts, one ends of the anchoring shoes are in sliding fit with the fixed parts, and the other ends of the anchoring shoes are in sliding fit with the movable parts; when the anchoring driving mechanism drives the moving part to approach the corresponding fixed part, the corresponding anchoring shoe is extruded in the direction far away from the anchoring main body; a driving shell is rotationally arranged on the anchoring main body, a storage groove is formed in the driving shell, a cutter is rotationally arranged in the storage groove, and the rotating mechanism is used for driving the driving shell to rotate; the screwing-out mechanism is used for screwing the cutter out of the containing groove. The oil pipe cutting device can cut an oil pipe more stably.

Description

Technical Field

[0001] The invention relates to the technical field of oil pipe cutting, in particular to an anchored shoe type production pipe string inner cutting tool. Background Art

[0002] As oil well exploitation enters the middle and late stages and the water content increases, problems such as wellbore scaling, oil casing corrosion, and casing damage arise. In order to ensure normal production of oil and gas fields, well repair operations must be carried out. During well repair operations, corroded and deformed oil pipes and oil pipes with the risk of rupture must be cut and recovered. Stable and efficient cutting operations can effectively reduce the cost of well repair operations.

[0003] Common cutting methods include chemical cutting, hydraulic cutting and mechanical cutting. Most chemical cutting uses the energy generated by explosions for cutting, but chemical pyrotechnics are difficult to transport; hydraulic cutting uses high-pressure water as power for cutting, but has the disadvantages of being unable to accurately position, uneven incisions that affect salvage, and slow lowering speed; mechanical cutting uses the blades on the cutting tool to rotate at high speed to cut objects. It has the advantages of fast lowering speed, accurate positioning, neat incisions that facilitate salvage, the ability to handle severely scaled oil wells, and multiple cuts in one trip. Mechanical cutting is an ideal method for efficiently carrying out well repair cutting operations. However, during the mechanical cutting process, the blades on the cutting tools used rotate at high speeds, which easily cause strong shaking between the oil pipes, making it difficult for the cutting tools to stably cut the oil pipes.

[0004] Therefore, there is an urgent need for an anchored shoe-type production string in-line cutting tool that is convenient for stably cutting the oil pipe. Summary of the invention

[0005] The object of the present invention is to provide an anchor shoe type production tubing inner cutting tool, aiming to improve the problem of insufficient stability when mechanically cutting the oil pipe in the prior art.

[0006] To achieve the above object, the present invention provides the following technical solutions: An anchor shoe type production pipe string inner cutting tool, comprising an anchor body, an anchor mechanism arranged on the anchor body, an anchor driving mechanism, a rotating mechanism and a screwing-out mechanism; The anchoring mechanism comprises a plurality of anchoring members distributed along the circumference of the anchoring body, the anchoring member comprises a fixed portion, a movable portion and an anchoring shoe, the fixed portion is fixedly arranged on the anchoring body, the movable portion is arranged to move in a direction close to the fixed portion, one end of the anchoring shoe is slidably matched with the fixed portion, and the other end is slidably matched with the movable portion; The anchoring drive mechanism drives the moving part to approach the corresponding fixed part to extrude the anchoring shoe in a direction away from the anchoring body; A drive housing is rotatably provided on the anchoring body. A receiving groove is provided on the drive housing. A cutter is rotatably arranged in the receiving groove. The rotating mechanism is used to drive the drive housing to rotate and then drive the cutter to perform a rotary cutting motion. The screwing-out mechanism is used to screw the cutter out of the receiving groove.

[0007] Further, the anchoring drive mechanism includes a hydraulic component and an anchoring transmission component. The anchoring transmission component includes a return spring, an anchoring piston, and an anchoring housing. An installation cavity is provided inside the anchoring body. The return spring and the anchoring piston are both located in the installation cavity. The upper end of the return spring abuts against the inner top wall of the installation cavity, and the lower end abuts against the anchoring piston. The anchoring piston is slidably and sealingly fitted with the inner wall of the installation cavity, and a hydraulic cavity is formed between the lower part of the anchoring piston and the inner bottom wall of the installation cavity. The hydraulic component is used to convey hydraulic oil into the hydraulic cavity and recover the hydraulic oil in the hydraulic cavity. The anchoring housing is slidably sleeved outside the anchoring body. A notch is provided on the anchoring body. A clamping interface is provided at a position on the anchoring housing corresponding to the notch. An anchoring block is clamped in the clamping interface. One end of the anchoring block passes through the notch and is connected to the anchoring piston. The size of the anchoring block is smaller than the size of the notch. An anchoring port is provided on the anchoring housing. The moving part is arranged at the anchoring port of the anchoring housing. The fixed part, the moving part, and the anchoring boot are all located in the anchoring port, and the moving part is located below the fixed part.

[0008] Further, an installation shell is provided above the anchoring body. The hydraulic component includes an extending drive motor, a first lead screw, a hydraulic piston, a hydraulic cylinder, and a hydraulic pipe. The extending drive motor and the hydraulic cylinder are both arranged in the installation shell, and the hydraulic cylinder is located below the extending drive motor. The output shaft of the extending drive motor faces downward and is coaxially connected to the first lead screw. The hydraulic piston includes a limiting section and a sealing section. The limiting section is slidably arranged along the length direction of the installation shell. A threaded cavity is provided inside the limiting section. One end of the first lead screw away from the extending drive motor is located inside the threaded cavity and is threadedly connected to the limiting section. The sealing section is located inside the hydraulic cylinder and is slidably and sealingly fitted with the inner wall of the hydraulic cylinder. One end of the hydraulic pipe is connected to the hydraulic cylinder, and the other end is communicated with the hydraulic cavity.

[0009] Further, the fixing part is a fixed T-shaped block, which is integrally formed with the anchoring main body. The moving part is a sliding T-shaped block, which is arranged on the anchoring housing. Guide rails with a T-shaped cross-section are arranged on both the fixed T-shaped block and the sliding T-shaped block, and the length directions of the two guide rails both have the same included angle with the axial direction of the anchoring main body. The distance between the two guide rails at the end close to the central axis of the anchoring main body is the closest. Two chutes are arranged on the anchoring shoe, and the shape of the chutes matches that of the guide rails. The guide rails of the fixed T-shaped block and the sliding T-shaped block are both located in the corresponding chutes of the anchoring shoe and are in sliding fit with the corresponding chutes.

[0010] Further, two anchoring transmission components are arranged on the anchoring main body at intervals along the length direction, and each anchoring transmission component is provided with a plurality of corresponding anchoring pieces. The driving housing is located below the two anchoring transmission components.

[0011] Further, a cylinder housing is arranged at the lower end of the installation shell. One end of the cylinder housing far away from the installation shell is connected to the upper end of the anchoring main body through a safety pin. The upper end of the hydraulic cylinder is located inside the installation shell, and the lower end is located inside the cylinder housing. One end of the hydraulic pipe far away from the hydraulic cylinder extends into the installation cavity after passing through the cylinder housing.

[0012] Further, a pre-shearing section is arranged on the safety pin. The diameter of the pre-shearing section is smaller than the diameter of the safety pin body, and the pre-shearing section is located at the junction where the anchoring main body is connected to the cylinder housing.

[0013] Further, the rotating mechanism includes a rotating drive motor and a transmission sleeve. An installation cavity is arranged inside the anchoring main body. The rotating drive motor is arranged inside the installation cavity. The output shaft of the rotating drive motor extends downward. One end of the transmission sleeve is coaxially connected to the output shaft of the rotating drive motor, and the other end extends outside the anchoring main body and is connected to the driving housing. The transmission sleeve is rotatably connected to the inside of the installation cavity.

[0014] Further, the unscrewing mechanism includes an unscrewing drive motor, a second lead screw, a motor housing, a spline sleeve, and a spline gear shaft. The unscrewing drive motor is disposed in a placement cavity above the rotary drive motor. The motor housing is slidably located in the placement cavity below the unscrewing drive motor along the length direction of the anchoring body. The rotary drive motor is located inside the motor housing. A threaded hole is formed in the motor housing. One end of the second lead screw is coaxially connected to the unscrewing drive motor, and the other end extends into the threaded hole of the motor housing and is threadedly connected to the motor housing. The spline sleeve is located inside the transmission sleeve. The output shaft of the rotary drive motor is coaxially connected to the upper end of the spline sleeve, and the spline sleeve is key-connected to the transmission sleeve. A spiral hole is formed inside the threaded spline sleeve. A long lead spiral tooth is arranged outside the spline gear shaft. The spline gear shaft is located inside the threaded spline sleeve, and the long lead spiral tooth of the spline gear shaft is matched with the spiral hole of the threaded spline sleeve. The lower end of the spline gear shaft extends into the drive housing and is provided with a first gear. An extending drive shaft is rotatably arranged on the drive housing. The extending drive shaft is parallel to the spline gear shaft. A second gear is arranged at one end of the extending drive shaft, and the tool is arranged at the other end. The first gear is meshed with the second gear.

[0015] Further, a shoulder is arranged at the end of the transmission sleeve located outside the anchoring body. A pressing sleeve is sleeved outside the shoulder. A fixed inclined surface is arranged on one end face of the anchoring body located inside the pressing sleeve. A pressing inclined surface is arranged inside the pressing sleeve, and the pressing inclined surface is in pressing fit with the fixed inclined surface. A pressing block is sleeved on the part of the anchoring body close to the shoulder. An external thread is arranged at one end of the pressing block close to the shoulder. An internal thread is arranged inside the pressing sleeve. One end of the pressing block close to the shoulder is located inside the pressing sleeve and is threadedly connected to the pressing sleeve. The pressing block abuts against the corresponding side of the shoulder. The drive housing is sleeved outside the pressing sleeve.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: In the present invention, when using the cutting tool of the present invention, the cutting tool is lowered into the oil pipe to be cut, so that the tool is close to the part of the oil pipe to be cut that needs to be cut. At this time, the moving part of each anchoring member is driven to approach the corresponding fixed part through the anchoring drive mechanism. Since the moving part and the fixed part approach each other, the corresponding anchoring boots can be extruded towards the oil pipe to be cut, so that the anchoring boots of multiple anchoring members can all abut against the inner wall of the oil pipe to be cut. And because multiple anchoring members are circumferentially distributed along the anchoring body, the anchoring body can be more stably fixed inside the oil pipe to be cut. Subsequently, the tool on the drive housing is unscrewed through the unscrewing mechanism, so that the cutting head of the tool can contact the inner side wall of the oil pipe to be cut. Then, the drive housing is driven to rotate through the rotating mechanism, so that the tool makes a circular cutting movement inside the oil pipe to be cut, thereby realizing the cutting operation of the oil pipe. Brief Description of the Drawings

[0017] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention. In the drawings: Figure 1 It is a cross-sectional view of the overall assembly structure of the anchor boot type production string internal cutting tool of the present invention. It can be understood that: Figure 1 When the lower end of the left figure in the middle is docked with the upper end of the right figure, it is the schematic diagram of the complete cutting tool structure; Figure 2 of the present invention Figure 1 It is an enlarged view of part A in the middle, aiming to show the local structure of the hydraulic component; Figure 3 It is a cross-sectional view of the local structure of the present invention, aiming to show the structure of the anchoring mechanism; Figure 4 It is a local structure diagram of the present invention, aiming to show the structure of the anchor boot; Figure 5 It is a local structure diagram of the present invention, aiming to show the local three-dimensional structure of the anchor drive assembly; Figure 6 It is a schematic diagram of the structure of the anchor drive assembly of the present invention; Figure 7 It is a local structure diagram of the unscrewing mechanism and the rotating mechanism of the present invention; Figure 8 It is a local structure diagram of the unscrewing mechanism of the present invention.

[0018] Reference numerals in the drawings and corresponding component names: 1. Extension drive motor; 2. Hydraulic piston; 3. Hydraulic cylinder; 4. Cylinder housing; 5. Safety pin; 6. Hydraulic pipe; 7. Anchoring drive assembly; 8. Anchoring mechanism; 9. Anchoring body; 10. Unscrewing drive motor; 11. Motor housing; 12. Rotary drive motor; 13. Spline sleeve; 14. Spline gear shaft; 15. Placement cavity; 16. Second lead screw; 17. Tool; 18. Extension drive shaft; 19. Storage groove; 20. Installation cavity; 21. Hydraulic cavity; 22. Notch; 23. Clamping interface; 24. Anchoring port; 25. Installation shell; 26. Limiting cylinder; 27. Limiting section; 28. Sealing section; 29. Thread cavity; 30. First lead screw; 31. Thread hole; 7a. Anchoring block; 7b. First anchoring screw; 7c. Anchoring piston; 7d. Anchoring housing; 7e. Return spring; 7f. Anchoring hole; 8a. Second anchoring screw; 8b. Sliding T-block; 8c. Anchoring boot; 8d. Fixed T-block; 8e. Chute; 13a. Long spline; 13b. Helical hole; 14a. Long lead helical teeth; 14b. First gear; 16a. Drive sleeve; 16b. Pressing block; 16c. Drive connection screw; 16d. Pressing sleeve; 16e. Drive housing; 16f. Pressing thread; 16g. Circumferential power transmission hole; 16h. Fixed inclined plane; 16i. Pressing inclined plane; 16j. Long spline groove; 18a. Second gear. Detailed implementation mode

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0020] Embodiment 1 An anchoring boot type production string internal cutting tool, referring to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8, including an anchoring body 9, an anchoring mechanism 8 provided on the anchoring body 9, an anchoring driving mechanism, a rotating mechanism, and an unscrewing mechanism; the anchoring mechanism 8 includes a plurality of anchoring members circumferentially distributed along the anchoring body 9, and each anchoring member includes a fixed part, a moving part, and an anchoring shoe 8c. The fixed part is fixedly provided on the anchoring body 9, the moving part is movably arranged in the direction close to the fixed part, one end of the anchoring shoe 8c is slidably matched with the fixed part, and the other end is slidably matched with the moving part; when the anchoring driving mechanism drives the moving part to approach the corresponding fixed part, the corresponding anchoring shoe 8c is extruded in the direction away from the anchoring body 9; a driving housing 16e is rotatably provided on the anchoring body 9, a receiving groove 19 is provided on the driving housing 16e, and a cutting tool 17 is rotatably arranged in the receiving groove 19. The rotating mechanism is used to drive the driving housing 16e to rotate; the unscrewing mechanism is used to unscrew the cutting tool 17 out of the receiving groove 19. Among them, the anchoring body 9 is integrally in a columnar structure.

[0021] In this solution, when using the cutting tool of the present invention, the cutting tool is lowered into the inner part of the oil pipe to be cut, so that the cutting tool 17 is close to the part of the oil pipe to be cut that needs to be cut. At this time, the moving part of each anchoring member is driven by the anchoring driving mechanism to approach the corresponding fixed part. Since the moving part and the fixed part approach each other, the corresponding anchoring shoe 8c can be extruded in the direction close to the oil pipe to be cut, so that the anchoring shoes 8c of multiple anchoring members can all abut against the inner wall of the oil pipe to be cut. And because the multiple anchoring members are circumferentially distributed along the anchoring body 9, the anchoring body 9 can be more stably fixed inside the oil pipe to be cut. Subsequently, the cutting tool 17 on the driving housing 16e is unscrewed through the unscrewing mechanism, so that the cutting head of the cutting tool 17 can contact the inner side wall of the oil pipe to be cut. Then, the driving housing 16e is driven to rotate through the rotating mechanism, so that the cutting tool 17 makes a circular cutting motion inside the oil pipe to be cut, thereby realizing the cutting operation of the oil pipe.

[0022] Embodiment 2 Based on Embodiment 1, in this embodiment, with reference to Figure 1 , Figure 2 , Figure 5 , Figure 6 , the anchoring driving mechanism includes a hydraulic component and an anchoring transmission component 7; the anchoring transmission component 7 includes a return spring 7e, an anchoring piston 7c, and an anchoring housing 7d. An installation cavity 20 is provided inside the anchoring body 9. The return spring 7e and the anchoring piston 7c are both located in the installation cavity 20. The upper end of the return spring 7e abuts against the inner top wall of the installation cavity 20, and the lower end abuts against the anchoring piston 7c. The anchoring piston 7c is slidably and sealingly matched with the inner wall of the installation cavity 20, and a hydraulic cavity 21 is formed between the lower part of the anchoring piston 7c and the inner bottom wall of the installation cavity 20; the hydraulic component is used to convey hydraulic oil into the hydraulic cavity 21 and recover the hydraulic oil in the hydraulic cavity 21; The anchoring housing 7d is slidably sleeved outside the anchoring body 9. A notch 22 is formed in the anchoring body 9. A clamping interface 23 is provided at a position of the anchoring housing 7d corresponding to the notch 22. An anchoring block 7a is clamped in the clamping interface 23. One end of the anchoring block 7a close to the anchoring body 9 passes through the notch 22 and is connected to the anchoring piston by a first anchoring screw 7b. An anchoring port 24 is provided on the anchoring housing 7d. An anchoring hole 7f is provided at a position of the anchoring housing 7d close to the anchoring port 24. The moving part is arranged inside the anchoring housing 7d. The moving part and the anchoring housing 7d are connected by a second anchoring screw 8a. The fixing part, the moving part and the anchoring shoe 8c are all located in the anchoring port 24, and the moving part is located below the fixing part. Among them, the dimension of the anchoring block 7a along the length direction of the anchoring body 9 is smaller than the dimension of the notch 22 along the direction of the anchoring body 9, which is convenient for the anchoring block 7a to move with the anchoring piston 7c in the notch 22.

[0023] In this solution, the anchoring driving mechanism is used to control the extension and retraction of multiple anchoring shoes 8c. The specific action process of the extension of the anchoring shoe 8c is as follows: First, hydraulic oil is conveyed into the hydraulic chamber 21 through the hydraulic component, so that the hydraulic oil pressure in the hydraulic chamber 21 increases. The high-pressure hydraulic oil drives the anchoring piston 7c to move upward. At this time, the return spring 7e is compressed, synchronously driving the anchoring housing 7d and the moving part to move upward, so that the distance between the fixing part and the moving part decreases, and then forcing the anchoring shoe 8c to extend, completing the anchoring action of the anchoring shoe type production string internal cutting tool. And by controlling the hydraulic oil pressure in the hydraulic chamber 21, the upward movement distance of the anchoring housing 7d and the moving part can be controlled, and then the distance between the fixing part and the moving part can be controlled, and then the extension displacement of the anchoring shoe 8c can be conveniently controlled. During the cutting process, due to the cutting vibration, the anchoring strength may decrease. By increasing the extension displacement of the anchoring shoe 8c, the anchoring strength is dynamically increased, which is beneficial to the cutting operation.

[0024] The retraction action process of the anchoring shoe 8c is as follows: The hydraulic oil inside the hydraulic chamber 21 is recovered through the hydraulic component, so that the hydraulic oil pressure in the hydraulic chamber 21 decreases. Under the action of the return spring 7e, the anchoring housing 7d and the moving part move downward to reset. At this time, the distance between the moving part and the fixing part increases, and then drives the anchoring shoe 8c to retract, completing the tool anchoring retraction action.

[0025] Embodiment 3 On the basis of Embodiment 2, in this embodiment, with reference to Figure 1 、 Figure 2 、 Figure 6, an installation shell 25 is arranged above the anchoring body 9. The hydraulic component includes an extension driving motor 1, a first lead screw 30, a hydraulic piston 2, a hydraulic cylinder 3 and a hydraulic pipe 6. The extension driving motor 1 and the hydraulic cylinder 3 are both arranged in the installation shell 25, and the hydraulic cylinder 3 is located below the extension driving motor 1. The output shaft of the extension driving motor 1 faces downward and is coaxially connected to the first lead screw 30. Inside the installation shell 25 between the extension driving motor 1 and the hydraulic cylinder 3, a limiting cylinder 26 is arranged. The hydraulic piston 2 includes a limiting section 27 and a sealing section 28. The limiting section 27 is slidably arranged in the limiting cylinder 26 along the length direction of the installation shell 25. The cross-sectional shapes of the limiting section 27 and the limiting cylinder 26 can be rectangular, which is convenient for preventing the limiting section 27 from rotating. A threaded cavity 29 is arranged inside the limiting section 27. One end of the first lead screw 30 away from the extension driving motor 1 is located inside the threaded cavity 29 and is threadedly connected to the limiting section 27. The sealing section 28 is located inside the hydraulic cylinder 3 and is slidably and sealingly matched with the inner wall of the hydraulic cylinder 3. One end of the hydraulic pipe 6 is connected to the hydraulic cylinder 3 and the other end is communicated with the hydraulic cavity 21.

[0026] In this solution, when it is necessary to control the extension of the anchoring shoe 8c, the extension driving motor 1 is started. The extension driving motor 1 drives the first lead screw 30 to rotate. Since the limiting section 27 of the hydraulic piston 2 moves along the length direction of the installation shell 25, at this time, the first lead screw 30 drives the hydraulic piston 2 to move downward and extrudes the hydraulic oil in the hydraulic cylinder 3. The hydraulic oil flows into the hydraulic cavity 21 through the hydraulic pipe 6, resulting in an increase in the internal hydraulic pressure of the hydraulic cavity 21, and then realizing the upward movement of the anchoring piston 7c, the anchoring outer shell 7d and the moving part, and further realizing the anchoring action of the cutting tool. When it is necessary to control the retraction of the anchoring shoe 8c, the extension driving motor 1 is reversely started, and the retraction action of the cutting tool can be realized through the opposite process.

[0027] Embodiment 4 On the basis of Embodiment 2, in this embodiment, with reference to Figure 1 , Figure 3 , Figure 4 , the fixing part is a fixed T-shaped block 8d, and the fixed T-shaped block 8d is integrally formed with the anchoring body 9. The moving part is a sliding T-shaped block 8b, and the sliding T-shaped block 8b is arranged on the anchoring outer shell 7d. Guide rails with a T-shaped cross-section are arranged on both the fixed T-shaped block 8d and the sliding T-shaped block 8b, and the length directions of the two guide rails both have the same included angle with the axial direction of the anchoring body 9. The distance between the two guide rails at one end close to the central axis of the anchoring body 9 is the closest; two sliding grooves 8e are arranged on the anchoring shoe 8c, and the shapes of the sliding grooves 8e match the guide rails. The guide rails of the fixed T-shaped block 8d and the sliding T-shaped block 8b are both located in the corresponding sliding grooves 8e of the anchoring shoe 8c and are slidably matched with the corresponding sliding grooves 8e.

[0028] In this solution, a fixed T-shaped block 8d and a sliding T-shaped block 8b with adjustable spacing are designed. On the one hand, the extension or retraction distance of the anchoring boot 8c can be adjusted by adjusting the spacing between the two. On the other hand, it can also prevent the situation where the anchoring boot 8c detaches from the fixed T-shaped block 8d and the sliding T-shaped block 8b.

[0029] Embodiment 5 Based on Embodiment 4, in this embodiment, referring to Figure 1 , two anchoring drive components 7 and two anchoring mechanisms 8 are arranged at intervals along the length direction on the anchoring body 9. The two anchoring drive components 7 and the two anchoring mechanisms 8 correspond one by one. The drive housing 16e is located below the two anchoring drive components 7. Among them, the anchoring mechanism 8 located below approaches the tool. Among them, the two anchoring drive components 7 are both provided with hydraulic oil by the same hydraulic component, that is, the hydraulic pipe 6 is connected to the hydraulic chambers 21 in the two anchoring drive components 7.

[0030] In this solution, a long cantilever beam formed by the tool 17 and the fixed point is avoided, and the amplitude during the cutting process of the cutting tool in the anchoring boot type production string can be greatly reduced, which is beneficial to ensuring the stability of the tool 17 during the cutting process.

[0031] Embodiment 6 Based on Embodiment 3, in this embodiment, referring to Figure 1 , a cylinder housing 4 is arranged at the lower end of the mounting shell 25. One end of the cylinder housing 4 far from the mounting shell 25 is connected to the upper end of the anchoring body 9 through a safety pin 5. The upper end of the hydraulic cylinder 3 is located inside the mounting shell 25, and the lower end is located inside the cylinder housing 4. One end of the hydraulic pipe 6 far from the hydraulic cylinder 3 passes through the cylinder housing 4 and then extends to the inside of the mounting cavity 20.

[0032] The conventional function of the safety pin 5 is: to provide overload protection in machinery or equipment, interrupt power transmission by shearing or falling off, and prevent key components from being damaged. In this solution, when the cutting tool in the anchoring boot type production string gets stuck during downhole cutting and cannot control the release of its anchoring, the anchoring boot type production string with the cutting tool is lifted from the ground, driving the cylinder housing 4 to move upward. Since the lower part of the anchoring boot type production string with the cutting tool is anchored and cannot move, the safety pin 5 is sheared off, and the cylinder housing 4 and the hydraulic cylinder 3 move upward together, causing one end of the hydraulic cylinder 3 to separate from the hydraulic pipe 6, and the hydraulic oil leaks out and the pressure drops, causing the anchoring boot 8c to retract and reset, and the anchoring of the cutting tool in the anchoring boot type production string is released, facilitating the removal of the remaining part of the cutting tool.

[0033] Specifically, a pre-shear section is arranged on the safety pin 5. The diameter of the pre-shear section is smaller than the diameter of the safety pin 5 body, and the pre-shear section is located at the junction where the anchoring body 9 is connected to the cylinder housing 4. A dangerous section with a smaller diameter is designed at the pre-shear surface of the safety pin 5, so that the shearing position can be controlled.

[0034] Example 7 Based on Example 1, in this example, referring to Figure 1 and Figure 7 , the rotating mechanism includes a rotating drive motor 12 and a transmission sleeve 16a. An installation cavity 15 is provided inside the anchoring body 9. The rotating drive motor 12 is arranged inside the installation cavity 15. The output shaft of the rotating drive motor 12 extends downward. One end of the transmission sleeve 16a is coaxially connected to the output shaft of the rotating drive motor 12, and the other end extends outside the anchoring body 9 and is connected to the drive housing 16e. The transmission sleeve 16a can be rotatably connected to the inner side wall of the installation cavity through a bearing.

[0035] In this solution, after anchoring the cutting tool, the tool 17 is screwed out by the screwing-out mechanism. Then, the rotating drive motor 12 is started. The rotating drive motor 12 drives the transmission sleeve 16a and the drive housing 16e to rotate, so that the tool 17 makes a circular cutting motion inside the oil pipe, facilitating the cutting operation of the oil pipe.

[0036] Example 8 Based on Example 7, in this example, referring to Figure 1 and Figure 7 and Figure 8, the unscrewing mechanism includes an unscrewing drive motor 10, a second lead screw 16, a motor housing 11, a helical spline sleeve 13, and a spline gear shaft 14; the unscrewing drive motor 10 is disposed in an accommodation cavity 15 above the rotary drive motor 12, the output shaft of the unscrewing drive motor 10 extends downward, the motor housing 11 is slidably located in the accommodation cavity 15 below the unscrewing drive motor 10 along the length direction of the anchoring body 9, and the cross-sectional shapes of the motor housing 11 and the accommodation cavity can be set as rectangular to facilitate preventing the motor housing 11 from rotating in the accommodation cavity 15. The rotary drive motor 12 is located inside the motor housing 11. A threaded hole 31 is provided on the motor housing 11. One end of the second lead screw 16 is coaxially connected to the unscrewing drive motor 10, and the other end extends into the threaded hole 31 of the motor housing 11 and is threadedly connected to the motor housing 11; the helical spline sleeve 13 is located inside the transmission sleeve 16a. The output shaft of the rotary drive motor 12 is coaxially connected to the upper end of the helical spline sleeve 13 through a pin shaft, and the helical spline sleeve 13 is key-connected to the transmission sleeve 16a. A long spline 13a is provided on the outside of the helical spline sleeve 13, and a long spline 13a groove is provided inside the transmission sleeve 16a. The long spline 13a of the helical spline sleeve 13 cooperates with the long spline 13a groove of the transmission sleeve 16a; a helical hole 13b is provided inside the helical spline sleeve 13, a long lead helix 14a is provided on the outside of the spline gear shaft 14, the spline gear shaft 14 is located inside the helical spline sleeve 13, and the long lead helix 14a of the spline gear shaft 14 cooperates with the helical hole 13b of the helical spline sleeve 13; the lower end of the spline gear shaft 14 extends into the drive housing 16e and is provided with a first gear 14b. A protruding drive shaft 18 is rotatably provided on the drive housing 16e. The protruding drive shaft 18 is parallel to the spline gear shaft 14. One end of the protruding drive shaft 18 is provided with a second gear 18a, and the other end is provided with a cutter 17, and the first gear 14b meshes with the second gear 18a.

[0037] Among them, three cutters 17 are provided on the drive housing 16e, and the three cutters 17 are evenly distributed circumferentially along the central axis of the spline gear shaft 14, and the three cutters 17 all cooperate with the spline gear shaft 14.

[0038] In this solution, initially, the cutting tool 17 is stored in the storage groove 19 of the driving housing 16e. After the cutting tool is lowered to the part of the oil pipe to be cut, the unscrewing driving motor 10 is started. The unscrewing driving motor 10 drives the motor housing 11, the rotary driving motor 12, and the spline gear sleeve 13 to move along the length direction of the anchoring body 9 through the second lead screw 16. Since the helical hole 13b of the spline gear sleeve 13 is engaged with the long lead helical teeth 14a of the spline gear shaft 14, the axial movement of the spline gear sleeve 13 can be converted into the rotational movement of the spline gear shaft 14, causing the spline gear shaft 14 to rotate. Since the first gear 14b is engaged with the second gear 18a, the extending drive shaft 18 can be driven to rotate, and then the cutting tool 17 is unscrewed, so that the cutting head of the cutting tool 17 can abut against the inner side wall of the oil pipe, facilitating the cutting operation of the oil pipe.

[0039] Example 9 Based on Example 7, in this example, referring to Figure 7 , a shoulder is provided at the end of the transmission sleeve 16a located outside the anchoring body 9. A pressing sleeve 16d is sleeved outside the shoulder. A fixed inclined surface 16h is provided on one end face of the anchoring body 9 located inside the pressing sleeve 16d. A pressing inclined surface 16i is provided inside the pressing sleeve 16d, and the pressing inclined surface 16i is in pressing fit with the fixed inclined surface 16h. A pressing block 16b is sleeved on the part of the anchoring body 9 close to the shoulder. An external thread is provided at one end of the pressing block 16b close to the shoulder. An internal thread is provided inside the pressing sleeve 16d. One end of the pressing block 16b close to the shoulder is located inside the pressing sleeve 16d and is threadedly connected to the pressing sleeve 16d. The pressing block 16b abuts against the corresponding side of the shoulder, and the driving housing 16e is sleeved outside the pressing sleeve 16d.

[0040] More specifically, both the fixed inclined surface 16h and the pressing inclined surface 16i are conical inclined surfaces. The fixed inclined surface 16h of the transmission sleeve 16a is engaged with the pressing inclined surface 16i of the pressing sleeve 16d. The driving connection screw 16c connects the pressing sleeve 16d and the driving housing 16e, and the bottom of this screw is engaged with the circumferential power transmission hole 16g to transmit circumferential movement, and the cutting tool 17 is relatively fixed to the driving housing 16e. The rotary driving motor 12 rotates to drive the rotary driving mechanism to rotate, thereby driving the cutting tool 17 to rotate, and the anchor boot type in-tubing cutting tool starts the cutting work. One end of the pressing block 16b abuts against the shoulder of the transmission sleeve 16a and is connected to the pressing sleeve 16d through the pressing thread 16f. Rotating the pressing block 16b can make the pressing inclined surface 16i press inside the fixed inclined surface 16h, thereby greatly reducing the vibration during the rotation of the cutting tool 17.

[0041] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. Anchored shoe type production string internal cutting tool, characterized by: It comprises an anchoring body (9), an anchoring mechanism (8) arranged on the anchoring body (9), an anchoring driving mechanism, a rotating mechanism and a rotating-out mechanism; The anchoring mechanism (8) comprises a plurality of anchoring members distributed along the circumference of the anchoring body (9), the anchoring member comprises a fixed portion, a movable portion and an anchoring shoe (8c), the fixed portion is fixedly arranged on the anchoring body (9), the movable portion is arranged to move in a direction close to the fixed portion, one end of the anchoring shoe (8c) is slidably matched with the fixed portion, and the other end is slidably matched with the movable portion; When the anchoring driving mechanism drives the moving part to approach the corresponding fixed part, the anchoring shoe (8c) is extruded in a direction away from the anchoring body (9); A driving shell (16e) is provided on the anchoring body (9) and is rotatable around the central axis of the anchoring body (9); a receiving groove (19) is provided on the driving shell (16e); a tool (17) is rotatably provided in the receiving groove (19); the rotating mechanism is used to drive the driving shell (16e) to rotate and then drive the tool (17) to perform a rotating cutting motion; The screw-out mechanism is used to screw the cutter (17) out of the storage groove (19).

2. The anchor shoe type production string inner cutting tool according to claim 1, characterized in that: The anchoring drive mechanism comprises a hydraulic component and an anchoring transmission component (7); the anchoring transmission component (7) comprises a reset spring (7e), an anchoring piston (7c) and an anchoring housing (7d); a mounting cavity (20) is provided inside the anchoring body (9); the reset spring (7e) and the anchoring piston (7c) are both located in the mounting cavity (20); the upper end of the reset spring (7e) abuts against the inner top wall of the mounting cavity (20) and the lower end abuts against the anchoring piston (7c); the anchoring piston (7c) and the inner wall of the mounting cavity (20) are in sliding sealing cooperation; and a hydraulic cavity (21) is formed between the lower part of the anchoring piston (7c) and the inner bottom wall of the mounting cavity (20); the hydraulic component is used for conveying hydraulic oil into the hydraulic cavity (21) and recovering the hydraulic oil in the hydraulic cavity (21); The anchoring shell (7d) is slidably sleeved on the outside of the anchoring body (9); a notch (22) is provided on the anchoring body (9); a card interface (23) is provided at a position of the anchoring shell (7d) corresponding to the notch (22); an anchoring block (7a) is card-connected in the card interface (23); one end of the anchoring block (7a) passes through the notch and is connected to the anchoring piston (7c); the size of the anchoring block (7a) is smaller than the size of the notch (22); an anchoring opening (24) is provided on the anchoring shell (7d); the movable part is arranged at the anchoring opening (24) of the anchoring shell (7d); the fixed part, the movable part and the anchoring shoe (8c) are all located in the anchoring opening (24), and the movable part is located below the fixed part.

3. The anchor shoe type production string inner cutting tool according to claim 2, characterized in that: A mounting shell (25) is arranged above the anchoring body (9); the hydraulic assembly comprises an extension drive motor (1), a first screw rod (30), a hydraulic piston (2), a hydraulic cylinder (3) and a hydraulic pipe (6); the extension drive motor (1) and the hydraulic cylinder (3) are both arranged in the mounting shell (25), and the hydraulic cylinder (3) is located below the extension drive motor (1); the output shaft of the extension drive motor (1) is downward and coaxially connected to the first screw rod (30); the hydraulic piston (2) comprises a limit section (27) and a sealing member (6); The sealing section (28) is slidingly arranged along the length direction of the mounting shell (25), a threaded cavity (29) is arranged inside the limiting section (27), one end of the first screw rod (30) away from the extending driving motor (1) is located inside the threaded cavity (29) and is connected to the limiting section (27) by a thread, the sealing section (28) is located inside the hydraulic cylinder (3) and is slidingly sealed with the inner wall of the hydraulic cylinder (3); one end of the hydraulic pipe (6) is connected to the hydraulic cylinder (3), and the other end is connected to the hydraulic cavity (21).

4. The anchor shoe type production string inner cutting tool according to claim 2, characterized in that: The fixed part is a fixed T-block (8d), and the fixed T-block (8d) is integrally formed with the anchor body (9); the movable part is a sliding T-block (8b), and the sliding T-block (8b) is arranged on the anchor shell (7d); the fixed T-block (8d) and the sliding T-block (8b) are both provided with guide rails with a T-shaped cross-section, and the length directions of the two guide rails have the same angle with the axial direction of the anchor body (9), and the distance between the two guide rails and one end of the central axis of the anchor body (9) is the shortest; the anchor shoe (8c) is provided with two slide grooves (8e), and the shape of the slide grooves (8e) matches the guide rails, and the guide rails of the fixed T-block (8d) and the sliding T-block (8b) are both located in the corresponding slide grooves (8e) of the anchor shoe (8c) and slideably cooperate with the corresponding slide grooves (8e).

5. The anchor shoe type production string inner cutting tool according to claim 4, characterized in that: Two anchoring transmission assemblies (7) and two anchoring mechanisms (8) are arranged on the anchoring body (9) at intervals along the length direction. The two anchoring transmission assemblies (7) correspond to the two anchoring mechanisms (8) one by one, and the hydraulic pipe (6) is connected to the hydraulic chambers (21) of the two anchoring transmission assemblies (7). The driving housing (16e) is located below the two anchoring transmission assemblies (7), and the anchoring mechanism (8) located below is close to the tool.

6. The anchor shoe type production string inner cutting tool according to claim 3, characterized in that: A cylinder housing (4) is provided at the lower end of the mounting shell (25); an end of the cylinder housing (4) away from the mounting shell (25) is connected to the upper end of the anchor body (9) via a safety pin (5); an upper end of the hydraulic cylinder (3) is located in the mounting shell (25) and a lower end is located in the cylinder housing (4); an end of the hydraulic pipe (6) away from the hydraulic cylinder (3) passes through the cylinder housing (4) and extends to the interior of the mounting cavity (20).

7. The anchor shoe type production string inner cutting tool according to claim 6, characterized in that: The safety pin (5) is provided with a pre-shearing section, the diameter of which is smaller than the diameter of the safety pin (5) body, and the pre-shearing section is located at the junction where the anchoring body (9) is connected to the cylinder housing (4).

8. The anchor shoe type production string cutting tool according to claim 1, characterized in that: The rotating mechanism comprises a rotating drive motor (12) and a transmission sleeve (16a); a placement cavity (15) is provided inside the anchoring body (9); the rotating drive motor (12) is arranged inside the placement cavity (15); the output shaft of the rotating drive motor (12) extends downward; one end of the transmission sleeve (16a) is coaxially connected to the output shaft of the rotating drive motor (12); the other end extends to the outside of the anchoring body (9) and is connected to the drive housing (16e); the transmission sleeve (16a) is rotationally connected to the inside of the placement cavity (15).

9. The anchor shoe type production string cutting tool according to claim 8, characterized in that: The screw-out mechanism comprises a screw-out drive motor (10), a second screw rod (16), a motor housing (11), a helical spline sleeve (13) and a spline gear shaft (14); the screw-out drive motor (10) is arranged in a placement cavity (15) above the rotation drive motor (12); the motor housing (11) slides along the length direction of the anchoring body (9) and is located in the placement cavity (15) below the screw-out drive motor (10); the rotation drive motor (12) is located in the motor housing (11); a threaded hole (31) is provided on the motor housing (11); one end of the second screw rod (16) is coaxially connected to the screw-out drive motor (10); the other end extends into the threaded hole (31) of the motor housing (11) and is threadedly connected to the motor housing (11); the helical spline sleeve (13) is located inside the transmission sleeve (16a); the output shaft of the rotation drive motor (12) is coaxially connected to the upper end of the helical spline sleeve (13); , and the helical spline sleeve (13) is connected to the transmission sleeve (16a) by a key; the helical spline sleeve (13) is provided with a spiral hole (13b) inside, and the spline gear shaft (14) is provided with a long lead spiral tooth (14a) outside, the spline gear shaft (14) is located inside the helical spline sleeve (13), and the long lead spiral tooth (14a) of the spline gear shaft (14) matches with the spiral hole (13b) of the helical spline sleeve (13); the spline gear shaft (14) is provided with a long lead spiral tooth (14a) outside, and the spline gear shaft (14) is located inside the helical spline sleeve (13), and the long lead spiral tooth (14a) of the spline gear shaft (14) matches with the spiral hole (13b) of the helical spline sleeve (13); The lower end of the key gear shaft (14) extends to the interior of the driving housing (16e) and is provided with a first gear (14b); a protruding driving shaft (18) is rotatably provided on the driving housing (16e); the protruding driving shaft (18) is parallel to the spline gear shaft (14); a second gear (18a) is provided at one end of the protruding driving shaft (18) and the tool (17) is provided at the other end; and the first gear (14b) is meshed with the second gear (18a).

10. The anchor shoe type production string inner cutting tool according to claim 8, characterized in that: The transmission sleeve (16a) is provided with a shoulder at the end portion located outside the anchoring body (9), and a clamping sleeve (16d) is sleeved on the outside of the shoulder. A fixed inclined surface (16h) is provided on the end face of one end of the anchoring body (9) located inside the clamping sleeve (16d). A clamping inclined surface (16i) is provided inside the clamping sleeve (16d), and the clamping inclined surface (16i) is tightly matched with the fixed inclined surface (16h). A clamping block (16b) is sleeved on the portion of the anchoring body (9) close to the shoulder. An external thread is provided on the end of the clamping block (16b) close to the shoulder. An internal thread is provided on the inside of the clamping sleeve (16d). An end of the clamping block (16b) close to the shoulder is located inside the clamping sleeve (16d) and is threadedly connected to the clamping sleeve (16d). The clamping block (16b) is tightly pressed against the corresponding side of the shoulder, and the drive housing (16e) is sleeved on the outside of the clamping sleeve (16d).

Images