Workover equipment and milling shoe thereof

Abstract

The utility model discloses workover equipment and a milling shoe thereof, the milling shoe comprises a milling shoe main body, the milling shoe main body comprises a first end part and a second end part which are mutually connected, the first end part and the second end part are oppositely arranged, the first end part is connected with a driving end of a driving device through threads, and the driving device is used for driving the milling shoe to rotate. The milling shoe further comprises a connecting piece, a mounting hole is formed in the first end of the milling shoe body, a water outlet hole communicated with the mounting hole is formed in the second end of the milling shoe body, the connecting piece is movably arranged in the mounting hole, and the connecting piece is provided with a water outlet channel and a sewage discharging channel. And when the connecting piece moves in the mounting hole, one of the water outlet channel and the sewage discharge channel is selectively communicated with the water outlet hole. Compared with the prior art, the water outlet holes not only can achieve the effect of spraying cooling liquid, but also can achieve the effect of pollution discharge, during workover operation, an operator can simultaneously achieve the functions of grinding and pollution discharge only by adopting the grinding shoe, and the operation difficulty is greatly reduced.

Description

Technical Field

[0001] The embodiments of the present utility model relate to the technical field of oilfield workover, and particularly to a workover device and a mill shoe thereof. Background Art

[0002] Oilfield workover refers to the work of maintaining, repairing or replacing wellhead equipment during oilfield operations, including equipment inspection and repair, wellbore cleaning, wellbore integrity inspection and wellhead device replacement.

[0003] A mill shoe is a tool specifically used for tubing, drill pipes, packers, bridge plugs, etc. during workover. The mill shoe in the prior art includes a main body and cemented carbide embedded in the front section of the main body. The front end face of the main body is milled with multiple embedding grooves, and embedding blocks and cutting tools are welded in the embedding grooves. Water holes are provided at positions corresponding to the embedding grooves, and the water holes are connected to an external water outlet device. The water outlet device sprays coolant to the working surface and the cutting tools through the water holes to reduce the temperature of the mill shoe during operation and prevent the temperature of the cutting tools from rising and affecting the material strength. In actual work, during workover operations, the impurities ground by the mill shoe need to be pumped out by a silt pumping device, otherwise it will hinder the continuous operation of the mill shoe. Therefore, the operator needs to stop the operation of the mill shoe at regular intervals and replace it with a silt pumping device to pump the silt in the well. This method is frequently operated, very time-consuming and laborious, and increases the work difficulty of workover operations. Summary of the Utility Model

[0004] In view of the deficiencies in the prior art, the present utility model provides a workover device and a mill shoe thereof, which can perform water outlet and silt pumping simultaneously without replacing the device, thereby reducing the operation difficulty.

[0005] To achieve the above object, the present utility model adopts the following technical solutions:

[0006] A mill shoe includes a mill shoe main body and a connecting member. The mill shoe main body includes a first end and a second end connected to each other. An installation hole is formed inside the first end, and a water outlet hole communicating with the installation hole is formed in the second end. The connecting member is movably disposed in the installation hole, and the connecting member is provided with a water outlet channel and a sewage discharge channel. Wherein, when the connecting member moves in the installation hole, one of the water outlet channel and the sewage discharge channel can be selectively communicated with the water outlet hole.

[0007] As one of the implementation manners, the mill shoe main body is provided with a slideway and a plurality of limiting grooves. The slideway extends along the length direction of the mill shoe main body, and the plurality of limiting grooves are arranged at intervals along the length direction of the mill shoe main body. A limiting portion is provided on the outer side of the connecting member, and the limiting portion can be selectively engaged with the limiting grooves or can be selectively slid in the slideway.

[0008] As one of the embodiments, the mill shoe includes an elastic member. The connecting member is rotatably disposed in the mounting hole. An elastic member is provided between the connecting member and the mill shoe body. The elastic member is configured to push the connecting member to rotate so that the limiting portion is engaged with the limiting groove, and the limiting groove is configured to limit the sliding of the connecting member in the mounting hole.

[0009] As one of the embodiments, a communication hole is formed in the hole wall of the water outlet hole. The mill shoe includes a first communication pipe and a second communication pipe. The first communication pipe is connected to the outlet of the water outlet channel, and the second communication pipe is connected to the outlet of the sewage discharge channel. When the connecting member slides in the mounting hole, one of the first communication pipe and the second communication pipe is connected to the communication hole.

[0010] As one of the embodiments, along the direction approaching the connecting member, the communication hole is inclined in the direction approaching the first end portion.

[0011] As one of the embodiments, the number of the communication holes is multiple or one. When the communication hole is one, the diameters of the communication hole, the first communication pipe, and the second communication pipe are the same. When the communication holes are multiple, the diameters of at least one of the communication holes and the first communication pipe are the same, and the diameters of at least one of the communication holes and the second communication pipe are the same.

[0012] As one of the embodiments, the diameter of the second communication pipe is larger than that of the first communication pipe.

[0013] As one of the embodiments, along the direction approaching the second end portion, the sewage discharge channel is located below the water outlet channel.

[0014] As one of the embodiments, the mill shoe includes a bearing, and the bearing is disposed between the connecting member and the mill shoe body.

[0015] Another object of the present invention is to provide a workover device, including the mill shoe in any one of the above embodiments and a driving device. The first end portion of the mill shoe is connected to the driving end of the driving device, and the driving device is configured to drive the mill shoe to rotate.

[0016] The beneficial effects of the present utility model are as follows: The embodiment of the present application provides a workover device and a mill shoe thereof. The mill shoe includes a mill shoe body, which includes a first end and a second end connected to each other. The first end and the second end are arranged oppositely. A thread is provided on the outer side of the first end, and the first end is connected to the driving end of the driving device through the thread. The driving device is used to drive the mill shoe to rotate. The mill shoe further includes a connecting member. An installation hole is provided inside the first end of the mill shoe body, and a water outlet hole communicating with the installation hole is provided in the second end. The connecting member is movably arranged in the installation hole, and the connecting member is provided with a water outlet channel and a sewage discharge channel. Wherein, when the connecting member moves in the installation hole, one of the water outlet channel and the sewage discharge channel can be selectively communicated with the water outlet hole. Compared with the prior art, the water outlet hole can not only achieve the function of spraying coolant but also the function of sewage discharge. During the workover operation, the operator only needs to use one device, namely the mill shoe, to simultaneously meet the functions of grinding and sewage discharge, without the need to frequently replace the device, greatly reducing the operation difficulty, saving construction time and the physical strength of the operator, and simplifying the construction steps. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 FIG. shows a cross-sectional schematic view of a mill shoe body according to an embodiment of the present utility model;

[0018] Figure 2 FIG. shows a sectional schematic view of a mill shoe body according to an embodiment of the present utility model;

[0019] Figure 3 FIG. shows a structural schematic view of a mill shoe according to an embodiment of the present utility model;

[0020] Figure 4 is Figure 3 an enlarged view of part A in

[0021] Reference numerals: 1, mill shoe body; 2, connecting member; 3, elastic member; 4, first connecting pipe; 5, second connecting pipe; 6, bearing; 11, first end; 12, second end; 13, installation hole; 14, water outlet hole; 15, slideway; 16, limiting groove; 21, water outlet channel; 22, sewage discharge channel; 23, limiting part; 71, insert block; 72, grinding knife; 73, mounting seat; 141, communication hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] In the present utility model, the terms "arranged", "provided with", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there can be internal communication between two devices, components, or parts. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0023] The terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application.

[0024] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0025] Moreover, in addition to being used to represent the orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present utility model can be understood according to the specific circumstances.

[0026] In order to make the purpose, technical solution and advantages of the present utility model clearer, the following further describes the present utility model in detail with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0027] Referring to Figure 1 , an embodiment of the present application provides a workover device, including a mill shoe and a driving device. The mill shoe includes a mill shoe body 1. The mill shoe body 1 includes a first end 11 and a second end 12 that are connected to each other. The first end 11 and the second end 12 are oppositely arranged. A thread is provided on the outside of the first end 11. The first end 11 is connected to the driving end of the driving device through the thread. The driving device is used to drive the mill shoe to rotate.

[0028] In practical applications, the mill shoe further includes inserts 71 and a cutter 72. A plurality of insert grooves are provided at the end of the second end 12. Each insert groove is welded with an insert 71. An installation groove is provided on one side of the insert 71. An installation seat 73 is provided in the installation groove. The cutter 72 is welded in the installation seat 73. Preferably, the cutter 72 uses a cubic boron nitride blade. The insert grooves are preferably 4 in number and are evenly spaced along the circumferential direction of the second end 12. During normal operation, the driving device drives the mill shoe to rotate, so that the cutter 72 grinds the working surface to ensure the smoothness and safety of the wellbore.

[0029] Refer again to Figure 1 , the mill shoe further includes a connecting member 2. An installation hole 13 is formed inside the first end portion 11 of the mill shoe body 1, and a water outlet hole 14 communicating with the installation hole 13 is formed in the second end portion 12. The connecting member 2 is movably disposed in the installation hole 13, and the connecting member 2 is provided with a water outlet channel 21 and a sewage discharge channel 22; wherein, when the connecting member 2 moves in the installation hole 13, one of the water outlet channel 21 and the sewage discharge channel 22 can be selectively communicated with the water outlet hole 14.

[0030] In practical applications, the water outlet hole 14 is provided on the end face of the second end portion 12, the water outlet hole 14 is provided between two insert grooves, and the water outlet direction of the water outlet hole 14 faces the grinding tool 72. The water outlet hole 14 is used to spray coolant onto the grinding tool 72 to help reduce friction and temperature during the working process of the grinding tool 72 and prevent the tool from overheating. The connecting member 2 is provided with a water outlet channel 21. One end of the water outlet channel 21 is provided with a connecting thread for connecting an external water supply device, and the other end is used for connecting with the water outlet hole 14; at the same time, the connecting member 2 is also provided with a sewage discharge channel 22. One end of the sewage discharge channel 22 is provided with a communicating thread for connecting an external silt extraction device, and the other end is used for connecting with the water outlet hole 14.

[0031] Based on this, the water outlet hole 14 can not only play the role of spraying coolant but also play the role of sewage discharge. During well workover operations, the operator only needs to use one mill shoe device to simultaneously meet the functions of grinding and sewage discharge, without the need to frequently replace the device, greatly reducing the operation difficulty, saving construction time and the physical strength of the operator, and simplifying the construction steps.

[0032] It should be noted that there is more than one water outlet hole 14. Therefore, the water outlet channel 21 and the sewage discharge channel 22 can be selectively connected to the same water outlet hole 14 respectively. When connected to the same water outlet hole 14, this water outlet hole 14 can both discharge water and sewage. During the water discharge and sewage discharge processes, all water outlet holes 14 can discharge water or sewage, which can increase the working efficiency of a single process and improve the working effect of a single process; they can also be connected to different water outlet holes 14. At this time, the water outlet hole 14 connected by the water outlet channel 21 only performs the water discharge work, and the water outlet hole 14 connected by the sewage discharge channel 22 only performs the sewage discharge work. By adopting this method, the water discharge and sewage discharge can work simultaneously, and the grinding debris can be timely pumped out to prevent accumulation on the grinding tool 72 and the workpiece, which affects the grinding effect, helps to keep the working environment clean, reduces the pollution of the working area, and effectively improves the working efficiency.

[0033] Refer again to Figure 1, a mill shoe body 1 is provided with a slideway 15 and a plurality of limiting grooves 16. The slideway 15 extends along the length direction of the mill shoe body 1, and the plurality of limiting grooves 16 are arranged at intervals along the length direction of the mill shoe body 1. A limiting part 23 is arranged on the outer side of the connecting piece 2. The limiting part 23 can be selectively clamped with the limiting groove 16 or can be selectively slid in the slideway 15.

[0034] In one embodiment, taking the example that the water outlet channel 21 and the sewage discharge channel 22 communicate with the same water outlet hole 14 for illustration. Specifically, two limiting grooves 16 are arranged at intervals along the length direction of the mill shoe body 1, a slideway 15 is arranged along the length direction of the mill shoe body 1, the slideway 15 and the limiting groove 16 are not on the same straight line, a limiting part 23 is arranged on the outer side of the connecting piece 2. When water needs to be discharged, the limiting part 23 is clamped with one of the limiting grooves 16. At this time, the water outlet channel 21 is just communicated with the water outlet hole 14. The limiting groove 16 limits the sliding of the connecting piece 2, ensuring the connection stability between the water outlet channel 21 and the water outlet hole 14. Connect the water supply device to one end of the water outlet channel 21, and the function of spraying coolant from the water outlet hole 14 can be realized; when sewage needs to be discharged, since the connecting piece 2 is movably arranged in the mounting hole 13, that is, the connecting piece 2 can rotate or move in the mounting hole 13, so the operator can rotate the connecting piece 2 to make the connecting piece 2 rotate in the mounting hole 13, so that the limiting part 23 is separated from the limiting groove 16, and the limiting part 23 is rotated to the position of the slideway 15. At this time, the limiting part 23 can slide along the length direction of the slideway 15. The operator pushes the connecting piece 2 to slide, so that the limiting part 23 slides to a position opposite to another limiting groove 16, and then rotates the connecting piece 2 again, so that the limiting part 23 is clamped with another limiting groove 16. At this time, the sewage discharge channel 22 is communicated with the water outlet hole 14. Connect the dredging device to one end of the sewage discharge channel 22, and the function of discharging sewage from the water outlet hole 14 can be realized.

[0035] It should be noted that along the circumferential direction of the mill shoe body 1, the central angle corresponding to the connection line between the limiting groove 16 and the slideway 15 should be less than 40 degrees. In this way, the connecting piece 2 can be rotated by a smaller angle, so that the limiting part 23 can be rotated from the limiting groove 16 into the slideway 15, which is more convenient to operate and the structure is more compact.

[0036] In another embodiment, taking the example that the water outlet channel 21 and the sewage discharge channel 22 communicate with different water outlet holes 14 for illustration. When connecting different water outlet holes 14, only one limiting groove 16 can be provided. When the limiting part 23 is clamped with the limiting groove 16, the water outlet channel 21 is communicated with one of the water outlet holes 14, and the sewage discharge channel 22 is communicated with another water outlet hole 14, and the functions of discharging sewage and discharging water can be carried out simultaneously.

[0037] Refer to again Figure 1, the connecting member 2 is rotatably arranged in the mounting hole 13. An elastic member 3 is provided between the connecting member 2 and the mill shoe body 1. The elastic member 3 is used to push the connecting member 2 to rotate so that the limiting portion 23 is engaged with the limiting groove 16, and the limiting groove 16 is used to limit the sliding of the connecting member 2 in the mounting hole 13.

[0038] In practical applications, the elastic member 3 abuts between the connecting member 2 and the mill shoe body 1 respectively. The elastic member 3 is an elastic element that can generate torque. Therefore, during the working process, when the limiting portion 23 is engaged with the limiting groove 16, the limiting groove 16 restricts the movement of the connecting member 2. At the same time, the elastic member 3 has the function of elastic abutment, restricting the torsion of the connecting member 2, thereby preventing the connecting member 2 from rotating due to external force, ensuring that the connecting member 2 can only rotate when the operator applies force to rotate the connecting member 2. Through the combined limiting effect of the elastic member 3 and the limiting groove 16, the stability of the connecting member 2 in the mounting hole 13 is ensured, and the connecting member 2 is prevented from shaking randomly, thus avoiding the situation where the water outlet channel 21 or the sewage discharge channel 22 is misaligned with the water outlet hole 14.

[0039] Moreover, during the process of switching processes, that is, when switching from the water outlet process to the sewage discharge process, the operator rotates the connecting member 2. At this time, the elastic member 3 accumulates elastic potential energy. When the limiting portion 23 rotates to the slideway 15, the operator moves the connecting member 2 so that the limiting portion 23 slides to the position corresponding to another limiting groove 16. The operator releases the hand, and the elastic member 3 releases the elastic potential energy, automatically pushing the limiting portion 23 into another limiting groove 16, realizing the automatic positioning function of the connecting member 2, without manual rotation and positioning by the operator, effectively simplifying the complexity of the operation, saving the working time and physical strength of the operator. During the rotation process, at the same time, the elastic member 3 provides a reverse resilience force, making the operator feel better when rotating the connecting member 2 and the rotation more stable.

[0040] It can be understood that the elastic member 3 can adopt a structure such as a torsion spring.

[0041] Refer to Figure 2 , a communication hole 141 is formed in the hole wall of the water outlet hole 14. The mill shoe includes a first communication pipe 4 and a second communication pipe 5. The outlet of the water outlet channel 21 is connected to the first communication pipe 4, and the outlet of the sewage discharge channel 22 is connected to the second communication pipe 5; when the connecting member 2 slides in the mounting hole 13, one of the first communication pipe 4 and the second communication pipe 5 is connected to the communication hole 141.

[0042] In practical applications, the first connecting pipe 4 and the second connecting pipe 5 can be made of an elastic material. In this way, when the connector 2 moves, when the first connecting pipe 4 and the second connecting pipe 5 are pressed against by the hole wall of the mounting hole 13, they undergo slight elastic deformation to avoid hindering the movement of the connector 2. Until the connector 2 moves to a position where the communication hole 141 of the first connecting pipe 4 or the second connecting pipe 5 is aligned with the water outlet hole 14, the first connecting pipe 4 or the second connecting pipe 5 elastically resumes its shape, so that a part of the length of the first connecting pipe 4 or the second connecting pipe 5 can extend into the communication hole 141, ensuring that no leakage occurs at the communication hole 141 during the water outlet or sewage discharge process, and avoiding polluting the environment inside the mill shoe body 1.

[0043] Refer again to Figure 2 , in the direction close to the connector 2, the communication hole 141 is inclined in the direction close to the first end 11.

[0044] Specifically, in the direction from the second end 12 to the first end 11, the communication hole 141 is inclined upward in the direction close to the connector 2. With this setting, when discharging water, the coolant can better enter the water outlet hole 14, further avoiding seepage. When discharging sewage, the stains can be more smoothly adsorbed from the communication hole 141 into the sewage discharge channel 22, improving work efficiency.

[0045] Refer again to Figure 2 , the number of communication holes 141 is multiple or one. When there is one communication hole 141, the apertures of the communication hole 141, the first connecting pipe 4, and the second connecting pipe 5 are the same; when there are multiple communication holes 141, at least one communication hole 141 has the same aperture as the first connecting pipe 4, and at least one communication hole 141 has the same aperture as the second connecting pipe 5.

[0046] In one embodiment, the communication hole 141 can be one. When the communication hole 141 is one, by moving the connector 2, the first connecting pipe 4 and the second connecting pipe 5 are respectively aligned with the communication hole 141. At this time, the apertures of the communication hole 141, the first connecting pipe 4, and the second connecting pipe 5 are approximately the same. Preferably, the diameters of the first connecting pipe 4 and the second connecting pipe 5 are the same, and the diameters of the first connecting pipe 4 and the second connecting pipe 5 are slightly smaller than the aperture of the communication hole 141, which is convenient for the first connecting pipe 4 and the second connecting pipe 5 to extend into the communication hole 141. And opening one communication hole 141 can reduce the drilling area of the mill shoe body 1 and improve the structural strength of the mill shoe body 1.

[0047] In another embodiment, there may be multiple communication holes 141. One of the communication holes 141 is connected to the first communication pipe 4, and the other communication hole 141 is connected to the second communication pipe 5. Similarly, by moving the connecting member 2, the first communication pipe 4 and the second communication pipe 5 are respectively connected to different communication holes 141. This way can avoid the situation where one of the communication holes 141 is blocked, resulting in the inability to carry out the work.

[0048] Refer to again Figure 2 , the diameter of the second communication pipe 5 is larger than that of the first communication pipe 4.

[0049] Specifically, the second communication pipe 5 is used for sewage discharge. Therefore, the diameter of the second communication pipe 5 is set larger to effectively avoid the phenomenon of blockage during the sewage discharge process and affect the normal progress of the sewage discharge work.

[0050] Refer to again Figure 2 , along the direction close to the second end portion 12, the sewage discharge channel 22 is located below the water outlet channel 21.

[0051] When the first communication pipe 4 and the second communication pipe 5 are respectively connected to different communication holes 141, and the sewage discharge channel 22 is arranged below the water outlet channel 21, then the second communication pipe 5 is also located below the first communication pipe 4. That is to say, during sewage discharge, stains can be adsorbed into the sewage discharge channel 22 through the communication holes 141 faster. On the one hand, it can shorten the traveling distance of the stains in the water outlet holes 14, and on the other hand, it can avoid the stains from blocking the communication holes 141 connected to the first communication pipe 4 and prevent the water outlet work from being affected.

[0052] Refer to again Figure 1 , the mill shoe includes a bearing 6, and the bearing 6 is arranged between the connecting member 2 and the mill shoe body 1.

[0053] In practical applications, the bearing 6 can play a role in supporting and positioning the connecting member 2, making the rotation of the connecting member 2 more stable. The bearing 6 can reduce the friction between the connecting member 2 and the mill shoe body 1, isolate the vibration and impact of the rotating parts, and improve the stability of the whole equipment.

[0054] Different from the prior art, the embodiment of the present application provides a workover device and a mill shoe thereof. The mill shoe includes a mill shoe body 1, and the mill shoe body 1 includes a first end 11 and a second end 12 which are connected to each other. The first end 11 and the second end 12 are oppositely arranged. A thread is provided on the outer side of the first end 11, and the first end 11 is connected to the driving end of the driving device through the thread. The driving device is used to drive the mill shoe to rotate. The mill shoe further includes a connecting member 2. An installation hole 13 is formed inside the first end 11 of the mill shoe body 1, and a water outlet hole 14 communicating with the installation hole 13 is formed in the second end 12. The connecting member 2 is movably arranged in the installation hole 13, and the connecting member 2 is provided with a water outlet channel 21 and a sewage discharge channel 22. Wherein, when the connecting member 2 moves in the installation hole 13, one of the water outlet channel 21 and the sewage discharge channel 22 can be selectively communicated with the water outlet hole 14. Compared with the prior art, the water outlet hole 14 can not only play the role of spraying coolant but also play the role of sewage discharge. During the workover operation, the operator only needs to use one device, i.e., the mill shoe, to simultaneously meet the functions of grinding and sewage discharge, without the need to frequently replace the device, greatly reducing the operation difficulty, saving construction time and the physical strength of the operator, and simplifying the construction steps.

[0055] The above are only the specific embodiments of the present application. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present application, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present application.

Claims

1. A grinding shoe, characterized in that: include: The grinding shoe body (1) comprises a first end (11) and a second end (12) connected to each other, wherein the first end (11) is provided with a mounting hole (13) inside, and the second end (12) is provided with a water outlet hole (14) connected to the mounting hole (13); A connecting member (2) is movably disposed in the mounting hole (13), and the connecting member (2) is provided with a water outlet channel (21) and a sewage discharge channel (22); When the connecting member (2) moves in the mounting hole (13), one of the water outlet channel (21) and the sewage discharge channel (22) can be selectively connected to the water outlet hole (14).

2. The grinding shoe according to claim 1, characterized in that: The grinding shoe body (1) is provided with a slideway (15) and a plurality of limiting grooves (16); the slideway (15) extends along the length direction of the grinding shoe body (1); the plurality of limiting grooves (16) are arranged at intervals along the length direction of the grinding shoe body (1); a limiting portion (23) is provided on the outer side of the connecting member (2); the limiting portion (23) can be selectively engaged with the limiting groove (16) or can selectively slide in the slideway (15).

3. The grinding shoe according to claim 2, characterized in that: The grinding shoe comprises an elastic member (3); the connecting member (2) is rotatably arranged in the mounting hole (13); the elastic member (3) is arranged between the connecting member (2) and the grinding shoe body (1); the elastic member (3) is used to push the connecting member (2) to rotate so that the limiting portion (23) is engaged with the limiting groove (16); and the limiting groove (16) is used to limit the sliding of the connecting member (2) in the mounting hole (13).

4. The grinding shoe according to claim 2, characterized in that: A connecting hole (141) is provided on the hole wall of the water outlet hole (14); the grinding shoe comprises a first connecting pipe (4) and a second connecting pipe (5); the outlet of the water outlet channel (21) is connected to the first connecting pipe (4), and the outlet of the sewage discharge channel (22) is connected to the second connecting pipe (5); when the connecting member (2) slides in the mounting hole (13), one of the first connecting pipe (4) and the second connecting pipe (5) is connected to the connecting hole (141).

5. The grinding shoe according to claim 4, characterized in that: Along the direction approaching the connecting member (2), the communicating hole (141) is arranged inclined toward the direction approaching the first end (11).

6. The grinding shoe according to claim 4, characterized in that: The number of the communicating holes (141) is multiple or one. When the number of the communicating holes (141) is one, the apertures of the communicating hole (141), the first communicating tube (4) and the second communicating tube (5) are the same; when the number of the communicating holes (141) is multiple, at least one of the communicating holes (141) is the same as the aperture of the first communicating tube (4), and at least one of the communicating holes (141) is the same as the aperture of the second communicating tube (5).

7. The grinding shoe according to claim 6, characterized in that: The diameter of the second connecting pipe (5) is greater than the diameter of the first connecting pipe (4).

8. The grinding shoe according to claim 7, characterized in that: Along the direction close to the second end (12), the sewage discharge channel (22) is located below the water outlet channel (21).

9. The grinding shoe according to claim 1, characterized in that: The grinding shoe comprises a bearing (6), and the bearing (6) is arranged between the connecting member (2) and the grinding shoe body (1).

10. A well repairing equipment, characterized in that: It comprises the grinding shoe according to any one of claims 1 to 9 and a driving device, wherein the first end portion (11) of the grinding shoe is connected to a driving end of the driving device, and the driving device is used for driving the grinding shoe to rotate.

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