Chamfering device and using method thereof

Abstract

The invention discloses a chamfering device and a using method thereof, and belongs to the technical field of petroleum and natural gas, and the chamfering device comprises an anchoring assembly, a cutting assembly and a thrust assembly. The anchoring assembly is arranged on the oil pipe in a sleeving mode and fixedly connected with the oil pipe. The cutting assembly comprises a supporting sleeve and a cutting part, the oil pipe is sleeved with the supporting sleeve, the supporting sleeve is located between the anchoring assembly and the coupling, and the cutting part is arranged at the end, close to the coupling, of the supporting sleeve and can make contact with the coupling; the thrust assembly is located between the anchoring assembly and the cutting assembly and movably connected with the oil pipe, and the thrust assembly can move in the axial direction of the oil pipe and abut against the supporting sleeve. The application method of the chamfering device is applied to the chamfering device. Through cooperation of the anchoring assembly, the cutting assembly and the thrust assembly, the problems that manual polishing and chamfering quality is poor and efficiency is low are effectively solved.

Description

Technical Field

[0001] This invention relates to the field of oil and gas technology, and in particular to a chamfering device and its method of use. Background Technology

[0002] In the drilling and completion field of the oil and gas industry, open-hole fracturing in horizontal wells has become an important means to improve the production capacity of low-porosity, low-permeability, and low-pressure oil and gas reservoirs. Currently, open-hole fracturing completion technology for horizontal wells is widely used in many gas fields, achieving 3 to 5 times the production compared to vertical well stratification. However, this completion technology involves long horizontal open-hole sections, numerous tubing sections, and large tool outer diameters; therefore, successfully running the tubing into the well becomes crucial for successful completion.

[0003] Generally speaking, such as Figure 1 and Figure 2 As shown, tubing is connected by couplings. Chamfered tubing is a special type of tubing with a chamfer at one end of the coupling, which makes it easier to reduce friction and allows for free running in horizontal wells. Furthermore, chamfered tubing can smoothly remove solid particles from the bottom of the well, thus improving wellbore cleanliness. Therefore, in horizontal well technology, it is required that for tubing passing through well sections with an inclination greater than 60°, the lower end of the coupling must be machined into a chamfer of not less than 8×45°.

[0004] Currently, the chamfering of couplings is done manually by on-site workers using hand grinders next to the wellhead. A typical well runs about 160-200 tubing pieces, and chamfering often takes about two days. This is time-consuming, inefficient, and the chamfering quality rarely meets the requirements of the drilling engineering design. Furthermore, because gas wells require strict prohibition of open flames and electrical activity near the wellhead, electric equipment cannot be used for the chamfering process to avoid serious safety hazards. Summary of the Invention

[0005] The purpose of this invention is to provide a chamfering device and its usage method to solve the technical problems of low efficiency and difficulty in guaranteeing quality when operators manually grind chamfers using hand grinders in the prior art.

[0006] Based on the above concept, the technical solution adopted by this invention is as follows:

[0007] On one hand, embodiments of the present invention provide a chamfering device, comprising:

[0008] An anchoring assembly is fitted onto the oil pipe and fixedly connected to the oil pipe;

[0009] A cutting assembly includes a support sleeve and a cutting element. The support sleeve is fitted onto the oil pipe and located between the anchoring assembly and the coupling. The cutting element is disposed at one end of the support sleeve near the coupling and is capable of contacting the coupling.

[0010] A thrust assembly is located between the anchoring assembly and the cutting assembly and is movably connected to the oil pipe. The thrust assembly is axially movable along the oil pipe and abuts against the support sleeve.

[0011] Preferably, the thrust assembly includes a thrust sleeve and a movable handle, the movable handle being disposed on the outer periphery of the thrust sleeve, and the thrust sleeve being sleeved on the oil pipe and slidably connected to the oil pipe.

[0012] Preferably, the end of the thrust sleeve extends in a direction close to the anchoring assembly to form an extension, the extension being inserted into the anchoring assembly and threadedly connected to the anchoring assembly.

[0013] Preferably, the anchoring assembly includes two anchoring plates with a semi-circular cross-section, the two anchoring plates being interlocked and sleeved on the oil pipe.

[0014] Preferably, the anchoring assembly includes multiple connecting pieces, two pins, and two fixing screws. One side of each anchoring piece has multiple slots spaced apart along its axial direction. The slots of two anchoring pieces are arranged opposite each other and correspond one-to-one. Each pair of opposite slots engages with one of the connecting pieces. The two pins are respectively inserted into the multiple connecting pieces and the slots along the axial direction of the two anchoring pieces. The ends of the pins are fixed to the anchoring pieces by the fixing screws.

[0015] Preferably, the anchoring assembly further includes a plurality of locking screws, and the side of the anchoring piece away from the slot has a plurality of through holes spaced apart along its own axial direction. The through holes of two anchoring pieces are arranged opposite to each other and correspond one to one. The locking screws can be sequentially inserted and threadedly connected to the corresponding two through holes.

[0016] Preferably, the cutting assembly further includes two rotating handles, which are fixedly connected to the outer periphery of the support sleeve, and the two rotating handles are symmetrically arranged about the support sleeve.

[0017] Preferably, the cutting element is annular, and the end of the cutting element forms a cutting bevel. The cutting bevel is inclined at a first angle in the direction away from the support sleeve, and the first angle is greater than or equal to 30 degrees and less than or equal to 60 degrees.

[0018] Preferably, the inner wall of the anchoring component is provided with serrations, which can abut against the outer surface of the oil pipe.

[0019] On the other hand, embodiments of the present invention also provide a method for using a chamfering device, applied to the aforementioned chamfering device, comprising:

[0020] Step 1: Drive the thrust assembly to move along the axial direction of the oil pipe in a direction close to the coupling and abut against the support sleeve, so that the support sleeve moves along the oil pipe until the cutting part contacts the coupling;

[0021] Step 2: Drive the support sleeve to rotate around its own axis, so that the cutting element cuts the edge of the coupling.

[0022] The beneficial effects of this invention are:

[0023] The chamfering device proposed in this invention, in use, firstly, drives the thrust assembly to move along the axial direction of the tubing towards the coupling and abuts against the support sleeve, causing the support sleeve to move along the tubing until the cutting part contacts the coupling; then, drives the support sleeve to rotate around its own axis, causing the cutting part to cut the edge of the coupling. An anchoring assembly is fixed to the outer circumference of the tubing, acting as a limit to prevent the support sleeve and thrust assembly from slipping off the tubing under gravity. By driving the thrust assembly to move axially and abut against the support sleeve, a thrust is provided to the support sleeve, allowing the cutting part to tightly abut against the coupling, facilitating the subsequent cutting process. By driving the support sleeve to rotate around its own axis, the cutting part uniformly cuts the edge of the coupling circumferentially, thereby achieving uniform chamfering of the coupling, improving the accuracy and consistency of the chamfering, and effectively solving the problem that the chamfering quality of manual grinding is difficult to meet the drilling engineering design requirements. At the same time, this mechanized operation method improves the efficiency of chamfering, shortening the operation time compared to manual grinding with a hand grinder. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the fit between the oil pipe and the coupling when the coupling is not chamfered;

[0025] Figure 2 This is a schematic diagram showing the fit between the oil pipe and the coupling with the coupling in the chamfered state;

[0026] Figure 3 This is a front view of the chamfering device provided in Embodiment 1 of the present invention;

[0027] Figure 4 This is a first sectional view of the chamfering device provided in Embodiment 1 of the present invention;

[0028] Figure 5 This is a second cross-sectional view of the anchoring component provided in Embodiment 1 of the present invention.

[0029] In the picture:

[0030] 100. Oil pipe; 200. Coupling;

[0031] 1. Anchoring assembly; 11. Anchoring plate; 12. Connecting plate; 13. Shaft pin; 14. Fixing screw; 15. Locking screw; 16. First spring washer; 17. Second spring washer; 18. Through hole; 19. Slot;

[0032] 2. Cutting assembly; 21. Support sleeve; 22. Cutting part; 221. Cutting bevel; 23. Rotary handle;

[0033] 3. Thrust assembly; 31. Thrust sleeve; 311. Extension; 32. Moving handle. Detailed Implementation

[0034] Embodiments of the present invention are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0035] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0036] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0037] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0038] Example 1

[0039] This invention provides a chamfering device that enables a mechanized chamfering process for oil pipe couplings, thereby improving chamfering efficiency.

[0040] See Figures 1 to 5The chamfering device provided in this embodiment of the invention includes an anchoring component 1, a cutting component 2, and a thrust component 3. The anchoring component 1 is sleeved on and fixedly connected to the oil pipe 100. The cutting component 2 includes a support sleeve 21 and a cutting element 22. The support sleeve 21 is sleeved on the oil pipe 100 and located between the anchoring component 1 and the coupling 200. The cutting element 22 is disposed at one end of the support sleeve 21 near the coupling 200 and can contact the coupling 200. The thrust component 3 is located between the anchoring component 1 and the cutting component 2 and is movably connected to the oil pipe 100. The thrust component 3 can move axially along the oil pipe 100 and abut against the support sleeve 21.

[0041] The chamfering device proposed in this invention, in use, firstly, drives the thrust assembly 3 to move along the axial direction of the oil pipe 100 towards the coupling 200 and abuts against the support sleeve 21, causing the support sleeve 21 to move along the oil pipe 100 until the cutting part 22 contacts the coupling 200; then, drives the support sleeve 21 to rotate around its own axis, causing the cutting part 22 to cut the edge of the coupling 200. The anchoring assembly 1 is fixed to the outer periphery of the oil pipe 100, serving as a limit to prevent the support sleeve 21 and the thrust assembly 3 from slipping down the oil pipe 100 under gravity. By driving the thrust assembly 3 to move axially and abut against the support sleeve 21, a thrust is provided to the support sleeve 21, allowing the cutting part 22 to abut tightly against the coupling 200, facilitating the subsequent cutting process. By rotating the support sleeve 21 around its own axis, the cutting part 22 uniformly cuts the edge of the coupling 200 along its circumference, thereby achieving a uniform chamfering of the coupling 200. This improves the accuracy and consistency of the chamfering and effectively solves the problem that manual grinding of chamfers is difficult to meet the design requirements of drilling engineering. At the same time, this mechanized operation method improves the efficiency of chamfering and shortens the operation time compared to manual grinding by operators using hand grinders.

[0042] The specific structure of the chamfering device is described below.

[0043] Regarding anchoring assembly 1: Anchoring assembly 1 includes two semi-circular anchoring plates 11, which interlock and are fitted onto the oil pipe 100. The two semi-circular anchoring plates 11 allow for easy installation and removal, facilitating fixation on oil pipes 100 of different diameters and increasing the versatility of the chamfering device. Simultaneously, the interlocking mechanism provides a uniform and stable clamping force, ensuring a tight connection between anchoring assembly 1 and the oil pipe 100, further improving the stability and reliability of the entire chamfering device during operation.

[0044] In other embodiments, the anchoring component 1 can be an integral cylindrical sleeve fitted onto the oil pipe 100, or it can be three, four, or more anchoring pieces 11, with adjacent anchoring pieces 11 connected to each other to fit onto the oil pipe 100. No limitation is made here.

[0045] Specifically, the anchoring assembly 1 includes multiple connecting pieces 12, two pins 13, and two fixing screws 14. Multiple slots 19 are spaced apart along the axial direction on one side of each anchoring piece 11. The slots 19 of two anchoring pieces 11 are arranged opposite each other and correspond one-to-one. A connecting piece 12 is engaged with each pair of opposite slots 19. The two pins 13 are sequentially inserted into the multiple connecting pieces 12 and slots 19 along the axial direction of the two anchoring pieces 11, respectively. The ends of the pins 13 are fixed to the anchoring pieces 11 by the fixing screws 14. Through the cooperation of the connecting pieces 12, pins 13, and fixing screws 14, the two anchoring pieces 11 form a movable, openable and closable sleeve structure. By rotating either anchoring piece 11 around the pin 13, the opening angle between the two anchoring pieces 11 can be adjusted, thereby opening and closing the two anchoring pieces 11 to facilitate installation or removal from the oil pipe 100.

[0046] Furthermore, a first spring washer 16 is provided between the fixing screw 14 and the shaft pin 13 to enhance the stability and reliability of the connection. The first spring washer 16 has an elastic buffering effect, which can effectively prevent the fixing screw 14 from loosening due to vibration or repeated force during use, and maintain the tightness of the connection between the shaft pin 13 and the fixing screw 14.

[0047] In use, after the two anchoring pieces 11 are fitted onto the oil pipe 100, the two anchoring pieces 11 on the side away from the slot 19 are engaged with each other, so that the anchoring component 1 is clamped to the outer periphery of the oil pipe 100, thus realizing the fixed connection between the anchoring component 1 and the oil pipe 100.

[0048] To improve the stability and flexibility of the anchoring plate 11's engagement, the anchoring assembly 1 also includes multiple locking screws 15. Multiple through holes 18 are spaced apart along the axial direction on the side of the anchoring plate 11 away from the slot 19. The through holes 18 of two anchoring plates 11 are arranged opposite each other and correspond one-to-one. The locking screws 15 can be sequentially inserted and threaded into the corresponding two through holes 18. When two anchoring plates 11 are engaged, the locking screws 15 sequentially insert and thread into the corresponding through holes 18, allowing the anchoring plates 11 to be tightened from the other side, making the fit between the anchoring plates 11 and the oil pipe 100 tighter and more secure. Simultaneously, this structure increases operational flexibility. By adjusting the tightening degree of the locking screws 15, it can accommodate oil pipes 100 of different diameters, achieving optimal fixing effect for the anchoring plates 11, thereby ensuring the accuracy and quality of the chamfering work. Furthermore, when it is necessary to replace the oil pipe 100 or adjust the device, the locking screw 15 can be easily loosened and tightened, which improves work efficiency.

[0049] Specifically, a second spring washer 17 is provided between the locking screw 15 and the through hole 18, which can play a good role in buffering and preventing loosening. The elasticity of the second spring washer 17 can compensate for the stress changes of the locking screw 15 during the tightening process, reduce the loosening of the locking screw 15 due to vibration or uneven force, enhance the tightening effect of the locking screw 15, and make the anchor plate 11 more secure.

[0050] Furthermore, to further improve the stability of the engagement between the anchoring component 1 and the oil pipe 100 and prevent slippage of the anchoring component 1, the inner wall of the anchoring component 1 is provided with serrations, which can abut against the outer surface of the oil pipe 100. The serrations increase the friction between the anchoring component 1 and the oil pipe 100, effectively preventing slippage of the anchoring component 1 during operation. Moreover, the surface hardness of the serrations is increased through nitriding treatment, thereby improving their service life.

[0051] Regarding the thrust assembly 3: The thrust assembly 3 includes a thrust sleeve 31 and a moving handle 32. The moving handle 32 is disposed on the outer periphery of the thrust sleeve 31, which is fitted onto and slidably connected to the oil pipe 100. The moving handle 32 provides the operator with a clear point of force application and a gripping area, making the operation of the thrust sleeve 31 more convenient and precise. The thrust sleeve 31, fitted onto and slidably connected to the oil pipe 100, ensures that the thrust sleeve 31 can move smoothly and steadily along the axial direction of the oil pipe 100, thereby enabling precise control of the magnitude and direction of the thrust, providing a stable and suitable thrust for the cutting assembly 2.

[0052] Specifically, the two movable handles 32 are symmetrically arranged about the thrust sleeve 31, so that when the operator controls the movement of the thrust sleeve 31, the force is more even and the movement of the thrust sleeve 31 can be controlled more smoothly and accurately.

[0053] Specifically, the end of the thrust sleeve 31 extends into an extension 311 along the direction close to the anchoring assembly 1. The extension 311 is inserted into the anchoring assembly 1 and threadedly connected to it. In use, the operator holds the rotating handle 23 to rotate the thrust sleeve 31 around its own axis. Due to the threaded connection, the thrust sleeve 31 moves axially along the oil pipe 100 and applies a thrust to the support sleeve 21. The threaded connection ensures that the extension 311 is firmly fixed within the anchoring assembly 1, preventing loosening or displacement during thrust transmission, thus ensuring the accuracy and reliability of thrust transmission. Furthermore, the threaded connection eliminates the need for the operator to exert force by continuously pushing the rotating handle 23 to maintain the thrust of the thrust sleeve 31; simply rotating the handle 23 is sufficient. Due to the self-locking effect of the thread, once the thrust sleeve 31 is pressed against the support sleeve 21, the operator does not need to apply continuous force, saving labor costs.

[0054] More specifically, the thrust sleeve 31 includes two movable plates with a semi-circular cross-section, which are interlocked and sleeved on the oil pipe 100. It is understood that the connection method and connection process of the two movable plates are the same as those of the two anchoring plates 11 mentioned above, and will not be described in detail here.

[0055] Regarding the cutting assembly 2, it also includes two rotating handles 23, which are fixedly connected to the outer periphery of the support sleeve 21. The two rotating handles 23 are symmetrically arranged about the support sleeve 21. The rotating handles 23 facilitate the operator's application of force, making the operation more labor-saving and efficient. The symmetrical arrangement of the rotating handles 23 ensures that the force is more evenly distributed when rotating the support sleeve 21, enabling more stable and precise control of the rotation.

[0056] Specifically, the cutting element 22 is annular, and its end forms a cutting bevel 221. The cutting bevel 221 is inclined at a first angle away from the supporting sleeve 21, with the first angle being greater than or equal to 45 degrees and less than or equal to 60 degrees. The annular cutting element 22 can provide a more uniform distribution of cutting force during the cutting process, ensuring that the coupling 200 is subjected to balanced force in all parts during chamfering, thereby improving the consistency and accuracy of the chamfer. The inclination angle range of 45 degrees to 60 degrees ensures that the cutting bevel 221 can contact the coupling 200 with a more reasonable cutting force and cutting angle, making the cutting process smoother, reducing cutting resistance, and thus accelerating the chamfering speed. The specific angle of the cutting bevel 221 can be adapted to the on-site working conditions and actual needs, and is not limited here.

[0057] In addition, the support sleeve 21 includes two support plates with semi-circular cross-sections, which are interlocked and sleeved on the oil pipe 100. It is understood that the connection method and process of the two support plates are the same as those of the two anchoring plates 11 mentioned above, and will not be described in detail here.

[0058] Example 2

[0059] This invention also provides a method for using a chamfering device, applied to the aforementioned chamfering device, with specific usage steps including:

[0060] Step 1: Drive the thrust assembly 3 to move along the axial direction of the oil pipe 100 in the direction close to the coupling 200 and abut against the support sleeve 21, so that the support sleeve 21 moves along the oil pipe 100 until the cutting part 22 contacts the coupling 200.

[0061] In this step, the operator holds the moving handle 32 to drive the thrust sleeve 31 to rotate. Due to the threaded connection, the thrust sleeve 31 moves along the axial direction of the oil pipe 100 and applies a thrust to the support sleeve 21.

[0062] Furthermore, prior to step 1, the coupling 200 is secured with fasteners; the fasteners are used to counteract the reaction torque generated on the coupling 200 during the cutting process of the cutting assembly 2. Specifically, the fasteners are clamped onto the coupling 200 using pipe wrenches to achieve a tightening effect.

[0063] Step 2: Drive the support sleeve 21 to rotate around its own axis, so that the cutting part 22 cuts the edge of the coupling 200.

[0064] In this step, the operator holds the rotating handle 23 to drive the support sleeve 21 to rotate, and at the same time, the cutting part 22 located at the end of the support sleeve 21 also rotates synchronously. Since the cutting part 22 is in contact with the edge of the coupling 200, the friction generated by the rotation realizes the cutting process of the coupling 200.

[0065] It is understandable that the above-mentioned chamfering device requires two operators. One operator holds the two moving handles 32 with both hands and rotates the thrust sleeve 31; the other operator holds the two rotating handles 23 with both hands and rotates the support sleeve 21. In some cases, the method of use can be adjusted according to the actual working conditions, which will not be elaborated here.

[0066] The above embodiments merely illustrate the basic principles and characteristics of the present invention. The present invention is not limited to the above embodiments. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A chamfering device, characterized in that, The end of the oil pipe (100) is fitted with a coupling (200), the radius of which is larger than the radius of the oil pipe (100). The chamfering device includes: An anchoring component (1) is sleeved on the oil pipe (100) and fixedly connected to the oil pipe (100); The cutting assembly (2) includes a support sleeve (21) and a cutting element (22). The support sleeve (21) is sleeved on the oil pipe (100) and located between the anchoring assembly (1) and the coupling (200). The cutting element (22) is disposed at one end of the support sleeve (21) near the coupling (200) and can contact the coupling (200). The thrust assembly (3) is located between the anchoring assembly (1) and the cutting assembly (2) and is movably connected to the oil pipe (100). The thrust assembly (3) is axially movable along the oil pipe (100) and abuts against the support sleeve (21).

2. The chamfering device according to claim 1, characterized in that, The thrust assembly (3) includes a thrust sleeve (31) and a movable handle (32). The movable handle (32) is disposed on the outer periphery of the thrust sleeve (31). The thrust sleeve (31) is sleeved on the oil pipe (100) and slidably connected to the oil pipe (100).

3. The chamfering device according to claim 2, characterized in that, The end of the thrust sleeve (31) extends in a direction close to the anchoring assembly (1) to form an extension (311), the extension (311) being inserted into the anchoring assembly (1) and threadedly connected to the anchoring assembly (1).

4. The chamfering device according to claim 1, characterized in that, The anchoring assembly (1) includes two anchoring pieces (11) with a semi-circular cross section. The two anchoring pieces (11) are interlocked and sleeved on the oil pipe (100).

5. The chamfering device according to claim 4, characterized in that, The anchoring assembly (1) includes multiple connecting pieces (12), two pins (13), and two fixing screws (14). One side of the anchoring piece (11) is provided with multiple slots (19) spaced apart along its own axial direction. The slots (19) of the two anchoring pieces (11) are arranged opposite to each other and correspond one to one. Each pair of opposite slots (19) is engaged with a connecting piece (12). The two pins (13) are respectively inserted into the multiple connecting pieces (12) and the slots (19) along the axial direction of the two anchoring pieces (11). The end of the pin (13) is fixed to the anchoring piece (11) by the fixing screws (14).

6. The chamfering device according to claim 5, characterized in that, The anchoring assembly (1) also includes a plurality of locking screws (15). The anchoring piece (11) has a plurality of through holes (18) spaced apart along its own axis on the side away from the slot (19). The through holes (18) of the two anchoring pieces (11) are arranged opposite to each other and correspond one to one. The locking screws (15) can be sequentially inserted and threadedly connected to the corresponding two through holes (18).

7. The chamfering device according to any one of claims 1-6, characterized in that, The cutting assembly (2) also includes two rotating handles (23), which are fixedly connected to the outer periphery of the support sleeve (21), and the two rotating handles (23) are symmetrically arranged about the support sleeve (21).

8. The chamfering device according to any one of claims 1-6, characterized in that, The cutting element (22) is annular, and the end of the cutting element (22) forms a cutting slope (221). The cutting slope (221) is inclined at a first angle in the direction away from the support sleeve (21), and the first angle is greater than or equal to 45 degrees and less than or equal to 60 degrees.

9. The chamfering device according to any one of claims 1-6, characterized in that, The inner wall of the anchoring component (1) is provided with serrations, which can abut against the outer surface of the oil pipe (100).

10. A method of using a chamfering device, characterized in that, The chamfering device according to any one of claims 1-9 comprises: Step 1: Drive the thrust assembly (3) to move along the axial direction of the oil pipe (100) in a direction close to the coupling (200) and abut against the support sleeve (21), so that the support sleeve (21) moves along the oil pipe (100) until the cutting part (22) contacts the coupling (200); Step 2: Drive the support sleeve (21) to rotate around its own axis, so that the cutting part (22) cuts the edge of the coupling (200).

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