Torque limiter for screwing on drilling tool

Abstract

The invention relates to a torque limiter for screwing on a drilling tool. The torque limiter comprises a first connector used for bearing input torque, a second connector used for being connected with the drilling tool and a barrel used for connecting the first connector and the second connector and containing a force transmission assembly. The force transmission assembly comprises a core shaft arranged in the axial direction and a friction block unit installed on the core shaft, the friction block unit comprises a first friction block and a second friction block, the first friction block and the cylinder form circumferential limiting, the first friction block is rotationally connected with the core shaft, and the second friction block and the core shaft form circumferential limiting, and the second friction block is rotationally connected with the cylinder. Wherein the first friction block and the second friction block abut against each other, and the first friction block and the second friction block are configured to slide relative to each other when the torque is larger than the make-up torque of the drilling tool. At the moment, the torque limiter cannot output torque to the drilling tool any more, and therefore it is ensured that the torque limiter outputs make-up torque to the drilling tool to meet the design requirement.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of torque limiter, in particular to a torque limiter for make-up of drilling tools. BACKGROUND

[0002] The shell, mandrel and other components of drilling tools are often connected by threads. According to the design requirements, the make-up torque (the locking degree between threads) of each thread on the drilling tool should be consistent, or at least the make-up torque of the same batch of drilling tools should be consistent, so as to ensure that the quality of the drilling tools is not greatly different. In the prior art, a dismounting frame is generally used to make-up the drilling tools. Since the design requirement of the make-up torque is large, the technician applies torque to the drilling tool by the hydraulic pressure provided by the dismounting frame. However, due to the defects in the structural design of the dismounting frame and other reasons, there is a large error between the conversion of the hydraulic pressure to the torque, and thus the make-up torque applied to the drilling tool by the technician using the dismounting frame also has an error. SUMMARY

[0003] Based on the above problems existing in the prior art, the present application provides a torque limiter for make-up of drilling tools, which can ensure that the make-up torque of the drilling tools always meets the design requirements.

[0004] The technical scheme adopted by the present application to solve the technical problems is as follows: a torque limiter for make-up of drilling tools is provided, which comprises,

[0005] a first joint for receiving the make-up torque;

[0006] a second joint for connecting the drilling tool; and

[0007] a barrel for connecting the first joint and the second joint and for accommodating a force transmission assembly, the force transmission assembly comprising a mandrel arranged in an axial direction, and a friction block unit mounted on the mandrel, the friction block unit comprising a first friction block which is circumferentially limited with the barrel, and a second friction block which is circumferentially limited with the mandrel,

[0008] wherein the first friction block and the second friction block abut each other in the axial direction, and the first friction block and the second friction block are configured to slide relative to each other when the make-up torque is greater than a set value.

[0009] Further, the first friction block is provided with a clamping portion extending into a clamping groove of the barrel in the radial direction, the second friction block is keyed to the mandrel, and the first friction block is configured to rotate the mandrel by the static friction force between the first friction block and the second friction block when the torque is less than the set value, so as to rotate the second joint connected to the mandrel.

[0010] Further, a lower end of the barrel body is provided with an adjusting member, and an elastic member is arranged between the adjusting member and the friction block unit, the adjusting member is configured to be movable along an axial direction relative to the barrel body, so as to adjust the abutting force between the first friction block and the second friction block through the elastic member.

[0011] Further, the mandrel comprises a first mounting portion rotationally connected with the first joint, a second mounting portion for mounting the friction block unit, and an abutting portion arranged between the first mounting portion and the second mounting portion and extending in a radially outward direction, and a support frame abutting the abutting portion and the friction block unit in an axial direction is mounted on the second mounting portion.

[0012] Further, a thrust bearing is mounted on the first mounting portion and abuts the abutting portion and a stepped surface of the first joint.

[0013] Further, a plurality of the friction block units are arranged on the mandrel in an axial direction.

[0014] Further, a shear pin for forming circumferential limiting with the mandrel is mounted on the second joint, the shear pin is configured to be sheared when the make-up torque reaches n times of the set value and the first friction block and the second friction block are still relatively static, wherein n>1.

[0015] Further, an installation hole extending radially inward is formed on the second joint, so that the shear pin is partially accommodated in a mounting groove of the mandrel after passing through the installation hole.

[0016] Further, the first joint and the second joint define an installation cavity for mounting the force transmission assembly in the barrel body, and the barrel body is provided with an injection hole for injecting lubricating oil into the installation cavity.

[0017] Further, a fastener is mounted on the second joint, the fastener is configured to abut a drilling tool inserted into the second joint.

[0018] The beneficial effect of the present application is that the torque limiter for the make-up of the drilling tool comprises a first joint for bearing the input torque, a second joint for connecting the drilling tool, and a barrel for connecting the first joint and the second joint and accommodating a force transmission assembly. The force transmission assembly comprises a mandrel arranged in the axial direction, and a friction block unit mounted on the mandrel, the friction block unit comprising a first friction block in circumferential limit with the barrel and rotationally connected with the mandrel, and a second friction block in circumferential limit with the mandrel and rotationally connected with the barrel. The first friction block and the second friction block abut against each other, and are configured to slide relative to each other when the torque is greater than the make-up torque of the drilling tool. At this time, the torque limiter can no longer output torque to the drilling tool, thereby ensuring that the make-up torque output by the torque limiter to the drilling tool meets the design requirements.

[0019] An adjusting member and an elastic member are further arranged at the lower end of the barrel. Moving the adjusting member in the axial direction relative to the barrel can adjust the abutting force between the first friction block and the second friction block through the elastic member, and further adjust the static friction force between the first friction block and the second friction block. In this way, the torque output by the torque limiter after long-term use can reach the make-up torque that meets the design requirements, thereby improving the accuracy of the torque limiter and increasing the service life of the torque limiter.

[0020] In addition, a shear pin for forming circumferential limit is further arranged between the mandrel and the second joint. When the torque limiter fails, the shear pin is configured to be sheared when the input torque reaches n times the make-up torque and the first friction block and the second friction block are still relatively static, so as to ensure that the make-up torque output by the torque limiter to the drilling tool when it fails is within the error range of the design requirements. BRIEF DESCRIPTION OF DRAWINGS

[0021] The present application will be further described below in conjunction with the drawings and examples.

[0022] Figure 1 Fig. 1 shows a structure sectional view of a torque limiter for the make-up of a drilling tool.

[0023] Figure 2 Fig. 2 shows a structure sectional view of a torque limiter for the make-up of a drilling tool. Figure 1 Fig. 3 shows an A-A sectional view of a torque limiter for the make-up of a drilling tool.

[0024] Figure 3 Fig. 4 shows a structure sectional view of a torque limiter for the make-up of a drilling tool. Figure 1 Fig. 5 shows a B-B sectional view of a torque limiter for the make-up of a drilling tool.

[0025] Figure 4 Fig. 6 shows a structure sectional view of a torque limiter for the make-up of a drilling tool. Figure 1A C-C sectional view of a torque limiter for a make-up of a drilling tool.

[0026] Wherein, the reference signs in the figures: 100, torque limiter; 10, first joint; 11, connecting hole; 12, stepped surface;

[0027] 20, barrel; 21, mounting cavity; 22, pouring hole; 221, sealing plug; 23, clamping groove; 24, adjusting member; 30, second joint; 31, sealing member; 32, mounting hole; 33, fastener; 40, shear pin;

[0028] 50, force transmission assembly; 51, mandrel; 511, first mounting portion; 512, second mounting portion; 5121, mounting groove; 513, abutting portion; 514, thrust bearing; 515, bolt; 52, support frame; 53, friction block unit; 531, first friction block; 5311, clamping portion; 532, second friction block; 54, elastic member. DETAILED DESCRIPTION

[0029] In order to make the technical problems to be solved by the present application, technical solutions and beneficial effects clearer, the present application will be described in detail with reference to the drawings. The drawings are simplified schematic diagrams, and only illustrate the basic structure of the present application in a schematic manner, and therefore only show the configurations related to the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0030] REFERENCE Figure 1As shown, the torque limiter 100 for the make-up of a drilling tool provided by the present application comprises a first joint 10 for connecting a breakout rack (not shown), a second joint 30 for connecting a drilling tool (not shown), and a barrel 20 connecting the first joint 10 and the second joint 30. The first joint 10 and the second joint 30 together define an installation cavity 21 in the barrel 20 for installing a force transmission assembly 50, which is capable of converting the torque output by the breakout rack to the first joint 10 and / or the barrel 20 into a make-up torque meeting the design requirements and outputting the make-up torque meeting the design requirements to the drilling tool through the second joint 30. The make-up torque meeting the design requirements has a set value. The force transmission assembly 50 is connected to the second joint 30 through a shear pin 40. Once the torque output by the breakout rack to the first joint 10 and / or the barrel 20 exceeds the maximum torque that the torque limiter 100 can transmit, the shear pin 40 will be sheared, thereby ensuring that the torque output by the second joint 30 to the drilling tool will not be greater than the maximum torque that the torque limiter 100 can transmit. In the present application, the torque of the torque limiter 100 when the shear pin 40 is sheared is defined as the shearing torque, which is also the maximum torque that the torque limiter 100 can transmit.

[0031] Reference Figure 1 As shown, in some embodiments, the first joint 10 is generally a hollow cylindrical structure with two open ends. The first joint 10 is provided with a connecting hole 11 extending in the axial direction and used for rotational connection with the force transmission assembly 50, and a stepped surface 12 on the inner wall of the first joint 10 facing and abutting against the force transmission assembly 50. The lower end of the first joint 10 is connected to the upper end of the barrel 20. In some embodiments, the first joint 10 and the barrel 20 can be connected by welding, bolting, riveting, etc.

[0032] Reference Figures 1-3 As shown, in some embodiments, the barrel 20 is provided with a pouring hole 22 for pouring lubricating oil into the installation cavity 21, and a sealing plug 221 is installed in the pouring hole 22. The inner wall of the barrel 20 is provided with a clamping groove 23 for clamping the force transmission assembly 50, so as to transmit the torque output by the breakout rack to the force transmission assembly 50 through the barrel 20. The lower end of the barrel 20 is provided with an adjusting member 24 for adjusting the size of the torque that the force transmission assembly 50 can transmit, so as to improve the versatility of the torque limiter 100. The adjusting member 24 can move relative to the barrel 20 in the axial direction, so as to adjust the size of the torque that the force transmission assembly 50 can transmit.

[0033] In some embodiments, the adjusting member 24 is substantially ring-shaped. The outer wall of the adjusting member 24 is threadedly connected with the inner wall of the lower end of the barrel 20, so that the adjusting member 24 can move in the axial direction relative to the barrel 20. The inner wall of the adjusting member 24 is rotatably sealed with the outer wall of the upper end of the second joint 30 by the sealing member 31, so as to prevent the lubricating oil in the installation cavity 21 from leaking.

[0034] In combination Figure 1 and Figure 4 As shown in FIG. 2, in some embodiments, the second joint 30 is also substantially a barrel-shaped structure with two open ends. The upper end of the second joint 30 is provided with a mounting hole 32 extending in the radial direction, so as to mount the shear pin 40 for connecting the force transmission assembly 50. The side wall of the lower end of the second joint 30 is provided with a fastener 33 for connecting the drilling tool. In the present embodiment, the fastener 33 is a screw screwed on the second joint 30. The screw extends inwardly in the radial direction of the second joint 30, so as to abut the drilling tool inserted into the second joint 30. Moreover, the screw can also move relative to the second joint 30 in the radial direction, so that the second joint 30 can connect drilling tools of different specifications, thereby improving the adaptability of the torque limiter 100.

[0035] In combination Figure 1 As shown in FIG. 3, in some embodiments, the force transmission assembly 50 includes a mandrel 51 arranged in the axial direction in the installation cavity 21, a support frame 52 mounted on the mandrel 51, and a plurality of friction block units 53 sleeved on the mandrel 51 and abutting each other. The plurality of friction block units 53 can be circumferentially limited between the barrel 20 and the mandrel 51, so that the static friction force inside the friction block units 53 converts the dismounting frame output torque into a torque with a value equal to the set value and then outputs it to the drilling tool through the second joint 30.

[0036] The mandrel 51 includes a first mounting portion 511 for connecting the first joint 10, a second mounting portion 512 for connecting the second joint 30, and an abutting portion 513 located between the first mounting portion 511 and the second mounting portion 512 and extending radially outwardly. The first mounting portion 511 extends into the connecting hole 11 of the first joint 10 and is in clearance fit with the inner wall of the connecting hole 11, so that the mandrel 51 can rotate relative to the first joint 10. A thrust bearing 514 is sleeved on the first mounting portion 511. The upper end face of the thrust bearing 514 abuts against the stepped face 12 of the first joint 10, and the lower end face of the thrust bearing 514 abuts against the upper end face of the abutting portion 513. In this way, when the dismounting frame outputs torque to the drilling tool through the torque limiter 100, the first joint 10 and the mandrel 51 can not only rotate relative to each other but also bear the axial force exerted on the torque limiter 100 by the dismounting frame and the drilling tool. In some embodiments, the thrust bearing 514 is mounted on the first mounting portion 511 by a bolt 515.

[0037] In combination Figure 1 And Figure 4 As shown in FIG. 5, in some embodiments, a mounting groove 5121 for mounting the shear pin 40 is formed on the side wall of the lower end of the second mounting portion 512. The mounting groove 5121 is in the same radial direction as the mounting hole 32 of the second joint 30, so that the end of the shear pin 40 can enter the mounting groove 5121 after passing through the mounting hole 32, forming a circumferential limit between the mandrel 51 and the second joint 30. Once the torque output by the dismounting rack to the torque limiter 100 exceeds the maximum torque transmitted by the torque limiter 100, the shear pin 40 will be sheared by the second mounting portion 512 and the second joint 30, so that the circumferential limit between the mandrel 51 and the second joint 30 disappears. Thus, the mandrel 51 and the second joint 30 will rotate relative to each other, so that the dismounting rack can no longer output torque to the drilling tool through the torque limiter 100.

[0038] In combination again Figure 1 As shown in FIG. 6, in some embodiments, a support frame 52 is sleeved on the upper end of the second mounting portion 512. The upper end face of the support frame 52 abuts against the lower end face of the abutting portion 513, and the lower end of the support frame 52 abuts against the friction block unit 53, so as to limit the axial direction of the plurality of friction block units 53. The side wall of the support frame 52 is also sealed to the cylinder body 20 by the sealing member 31, preventing the lubricating oil in the mounting cavity 21 from leaking between the support frame 52 and the cylinder body 20. Similarly, the sealing member 31 on the support frame 52 and the second joint 30 can prevent small impurities such as dust from entering the mounting cavity 21, thereby ensuring the friction performance of the plurality of friction block units 53.

[0039] Referring to Figures 1-3 As shown in FIG. 7, in some embodiments, the friction block unit 53 includes a first friction block 531 forming a circumferential limit with the cylinder body 20, and a second friction block 532 forming a circumferential limit with the second mounting portion 512. A plurality of first friction blocks 531 and second friction blocks 532 are arranged on the second mounting portion 512 in the axial direction and abut against each other between the end faces of adjacent first friction blocks 531 and second friction blocks 532. The circumferential outer wall of the first friction block 531 is provided with a clamping portion 5311 extending into the clamping groove 23, so that the first friction block 531 and the cylinder body 20 form a circumferential limit. The circumferential inner wall of the first friction block 531 is in clearance fit with the second mounting portion 512, so that the first friction block 531 can rotate relative to the mandrel 51. In some embodiments, the clamping groove 23 extends to the lower end of the cylinder body 20 in the axial downward direction, so as to facilitate the installation of the first friction block 531.

[0040] The circumferential outer wall of the second friction block 532 is in clearance fit with the inner wall of the barrel 20, so that the second friction block 532 can rotate relative to the barrel 20. The circumferential inner wall of the second friction block 532 is in key connection with the second mounting portion 512, so that the circumferential limit is formed between the second friction block 532 and the mandrel 51. In some embodiments, the spline connection is adopted between the second friction block 532 and the second mounting portion 512.

[0041] Again in combination Figure 1 As shown, the elastic member 54 is further arranged between the lowermost friction block unit 53 and the adjusting member 24, and the two ends of the elastic member 54 abut against the adjusting member 24 and the lowermost friction block unit 53, respectively. By moving the adjusting member 24 along the axial direction relative to the barrel 20, the compression degree of the elastic member 54 by the lowermost friction block unit 53 and the adjusting member 24 is adjusted, and then the contact force between the friction block units 53 is adjusted. In this way, the static friction force between the first friction block 531 and the second friction block 532 can be adjusted, so that the torque limiter 100 converts the torque output by the dismounting frame into a torque with a value equal to the set value. Even if the end surfaces of the first friction block 531 and the second friction block 532 abut against each other are worn due to long-term use and the friction force inside the friction block units 53 is reduced, the static friction force between the first friction block 531 and the second friction block 532 can be increased by increasing the contact force between the friction block units 53 through the adjusting member 24, thereby effectively ensuring the accuracy of the torque limiter 100 and prolonging the service life of the torque limiter 100. In the present application, the maximum static friction torque between the first friction block 531 and the second friction block 532 of the torque limiter 100 is defined as the maximum static friction torque.

[0042] In some preferred embodiments, the torque limiter 100 bears a shear torque n times the set value when the shear pin 40 is broken, to ensure that the makeup torque output by the torque limiter 100 to the drilling tool when it fails is within the error range required by the design. Wherein, n>1. n can be 1.00, 1.10, 1.20, etc. Preferably, n is 1.10.

[0043] In some embodiments, if the torque output by the dismounting frame to the torque limiter 100 is less than the maximum static friction torque of the torque limiter 100, the first friction block 531 and the second friction block 532 are relatively static under the action of the static friction. In this way, the torque limiter 100 can output the torque output by the dismounting frame to the drilling tool.

[0044] In some other embodiments, the relative sliding between the first friction block 531 and the second friction block 532 can occur when the torque output by the breakout make-up tool is greater than the shear torque and less than the maximum static friction torque of the torque limiter 100. In this case, the torque output by the breakout make-up tool can only be output to the drilling tool by the torque limiter 100 at the maximum static friction torque.

[0045] In some other embodiments, the maximum static friction torque between the first friction block 531 and the second friction block 532 can be greater than the shear torque due to the entry of dust and other impurities. When the torque output by the breakout make-up tool is greater than the shear torque and less than the maximum static friction torque of the torque limiter 100, the shear pin 40 can be sheared by the second mounting portion 512 and the second joint 30. At the same time, the torque limiter 100 can also make a loud noise due to the breakage of the shear pin 40 to remind the technician. At this time, the relative rotation between the mandrel 51 and the second joint 30 can occur, and the torque limiter 100 is disabled because it can no longer output torque to the drilling tool.

[0046] In combination Figures 1-4 As shown in the drawings, the use process of the torque limiter 100 for the make-up of the drilling tool provided by the present application is as follows. The technician rotates the adjusting member 24 according to the design requirements, so that the maximum static friction torque of the torque limiter 100 is equal to the set value, and then connects the breakout make-up tool to the first joint 10 and / or the barrel 20 and connects the second joint 30 to the drilling tool. The technician can rotate the first joint 10 and / or the barrel 20 of the torque limiter 100 by the hydraulic pressure provided by the breakout make-up tool. During the rotation of the first joint 10 and the barrel 20, the barrel 20 drives the first friction block 531 to rotate through the cooperation between the clamping portion 5311 and the clamping groove 23. If the friction force between the first friction block 531 and the second friction block 532 is less than the maximum static friction force at this time, the first friction block 531 can drive the second friction block 532 to rotate under the action of the static friction force. And the mandrel 51 connected with the second friction block 532 rotates together. The mandrel 51 drives the second joint 30 to rotate through the shear pin 40, so that the torque output by the breakout make-up tool can be output to the drilling tool by the torque limiter 100.

[0047] If the torque outputted by the dismounting rack to the torque limiter 100 is greater than the maximum static friction torque, the first friction block 531 and the second friction block 532 will slide relative to each other. At this time, the first friction block 531 cannot drive the second friction block 532 to rotate, and thus the mandrel 51 cannot rotate. Therefore, the dismounting rack cannot output the torque greater than the maximum static friction torque to the drilling tool through the torque limiter 100. However, the torque limiter 100 outputs the maximum static friction torque to the drilling tool before the first friction block 531 and the second friction block 532 slide relative to each other, thereby ensuring that the makeup torque of the drilling tool meets the design requirements.

[0048] If the torque limiter 100 fails and the maximum static friction torque is greater than the shearing torque, the torque outputted by the dismounting rack to the torque limiter 100 will be transmitted to the mandrel 51 through the plurality of friction block units 53. If the torque outputted by the dismounting rack to the torque limiter 100 is also greater than the shearing torque, the shear pin 40 will be sheared by the mandrel 51 and the second joint 30. At the same time, the torque limiter 100 will make a loud noise when the shear pin 40 is sheared to remind the technician. At this time, the mandrel 51 and the second joint 30 can rotate relative to each other, so that the torque limiter 100 fails to transmit torque. However, the torque limiter 100 outputs the shearing torque to the drilling tool before the shear pin 40 is sheared. The shearing torque is n times the set value, so the actual makeup torque of the drilling tool is within the error range of the design requirements.

[0049] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection or integral connection, can be mechanical connection, can be direct connection or indirect connection through an intermediate medium, can be internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0050] It should be understood that the terms "length", "width", "upper", "lower", "front and back", "left and right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0051] While the present application has been described with reference to the preferred embodiments, it is to be understood that various modifications can change the scope of the present application to which they are not intended to deviate. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided that there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A torque limiter for a make-up of a drilling tool, comprising, a first joint (10) for receiving a make-up torque; a second joint (30) for connecting the drilling tool; and a barrel (20) for connecting the first joint (10) and the second joint (30) and for accommodating a force transmission assembly (50), the force transmission assembly (50) comprising a mandrel (51) arranged in an axial direction, and a friction block unit (53) mounted on the mandrel (51), the friction block unit (53) comprising a first friction block (531) circumferentially limited by the barrel (20), and a second friction block (532) circumferentially limited by the mandrel (51), wherein the first friction block (531) and the second friction block (532) abutting each other in the axial direction, the first friction block (531) and the second friction block (532) being configured to slide relative to each other when the make-up torque is greater than a set value.

2. The torque limiter for make-up of a drilling tool of claim 1, wherein, a clamping portion (5311) of the first friction block (531) is arranged to extend radially into a clamping groove (23) of the barrel (20), the second friction block (532) is keyed to the mandrel (51), the first friction block (531) is configured to rotate the mandrel (51) by means of a static friction force between the first friction block (531) and the second friction block (532) when the make-up torque is less than the set value, thereby rotating the second joint (30) connected to the mandrel (51).

3. The torque limiter for make-up of a well tool according to claim 2, characterized in that a regulating member (24) is mounted at a lower end of the barrel (20), a resilient member (54) abuts between the regulating member (24) and the friction block unit (53), the regulating member (24) is configured to move in the axial direction relative to the barrel (20) to adjust an abutting force between the first friction block (531) and the second friction block (532) by means of the resilient member (54).

4. The torque limiter for make-up of a well tool of claim 2, wherein, the mandrel (51) comprises a first mounting portion (511) rotationally connected to the first joint (10), a second mounting portion (512) for mounting the friction block unit (53), and an abutting portion (513) arranged between the first mounting portion (511) and the second mounting portion (512) and extending in a radially outward direction, the second mounting portion (512) has a support frame (52) mounted thereon to abut the abutting portion (513) and the friction block unit (53) in the axial direction.

5. The torque limiter for make-up of a well tool according to claim 4, characterized in that a thrust bearing (514) is mounted on the first mounting portion (511) to abut the abutting portion (513) and a stepped surface (12) of the first joint (10).

6. The torque limiter for make-up of a well tool of claim 1, wherein, a plurality of the friction block units (53) are arranged on the mandrel (51) in the axial direction.

7. The torque limiter for make-up of a well tool of claim 1, wherein, a shear pin (40) is mounted on the second joint (30) to circumferentially limit the mandrel (51), the shear pin (40) is configured to be sheared when the make-up torque reaches n times the set value and the first friction block (531) and the second friction block (532) are still relatively static, wherein n > 1.

8. The torque limiter for make-up of a well tool of claim 7, wherein, The second joint (30) is provided with a mounting hole (32) extending radially inward, so that the shear pin (40) is partially accommodated in the mounting groove (5121) of the mandrel (51) after passing through the mounting hole (32).

9. The torque limiter for make-up of a well tool of any of claims 1-8, wherein, The first joint (10) and the second joint (30) define a mounting cavity (21) for mounting the force transmission assembly (50) in the barrel (20), and the barrel (20) is provided with a pouring hole (22) for pouring lubricating oil into the mounting cavity (21).

10. The torque limiter for make-up of a well tool of any of claims 1-8, wherein, The second joint (30) is provided with a fastener (33), and the fastener (33) is configured to abut a drilling tool inserted into the second joint (30).

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