Mechanical drill string torque clutch

Abstract

The invention discloses a mechanical drill string torque clutch, and belongs to the technical field of well drilling. A mechanical drill string torque clutch comprises an upper connector and further comprises a mode locking mechanism, and the mode locking mechanism comprises a locking cylinder, a three-ring-groove locking sleeve, a four-ring-groove locking sleeve, a locking shaft, a locking spring, a locking ball and a locking ball sleeve. The mode switching mechanism comprises a switching spring, a spring compression ring, a mandrel, a guide drill bushing and a spline cylinder; and a lower joint. The torque of the upper drill column and the torque of the lower drill column can be combined and separated, the upper drill column and the lower drill column can rotate and drill together when the torque of the drill columns is combined, the upper drill column can rotate and drill, the lower drill column can slide and drill when the torque of the drill columns is separated, and therefore friction resistance of the drill columns in the drilling process can be reduced; the problem of supporting pressure in the sliding drilling process of directional drilling can be effectively solved, and the drilling efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of drilling, and in particular to a mechanical drill string torque clutch. Background Art

[0002] In the process of directional drilling, most of the directional drilling technology used is the screw sliding guidance technology. The screw sliding guidance technology is used in conjunction with a downhole power drill with a bent joint and MWD. ​​During directional drilling, the downhole power drill drives the drill bit to rotate and break the rock, while the drill string does not rotate. When this technology is used to drill long horizontal sections of horizontal wells and extended reach wells, the contact distance and contact area between the drill string and the well wall are long, which will cause great friction between the drill string and the well wall. When the friction is too large, the "support pressure" phenomenon will occur, which will hinder the transmission of drilling pressure to the drill bit and affect the drilling efficiency.

[0003] In order to solve the problem of excessive friction during directional drilling, some friction and drag reduction tools have been developed at home and abroad, such as hydraulic oscillators and rotary steerable tools. These tools can achieve certain friction and drag reduction effects, but there are still some shortcomings. For example, hydraulic oscillators have poor reliability and short service life, and are prone to failure during drilling. They can only drive the drill string to vibrate within a certain range, and the drag reduction effect is limited. The rotary steerable tool has excellent drag reduction effect, but its price is high, and the tool has electronic components and poor stability in use. Summary of the invention

[0004] The purpose of the present invention is to solve the problems existing in the prior art and to propose a mechanical drill string torque clutch.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A mechanical drill string torque clutch comprises an upper joint and further comprises:

[0007] The mode locking mechanism comprises a locking cylinder threadedly connected to the lower end of the upper joint, a three-ring groove locking sleeve and a four-ring groove locking sleeve arranged in the locking cylinder, a locking shaft arranged in the four-ring groove locking sleeve, a locking spring connected to the lower end table of the locking shaft, and a locking ball arranged in the ring groove of the four-ring groove locking sleeve, wherein a locking ball sleeve is arranged outside the locking ball;

[0008] A mode switching mechanism, the mode switching mechanism comprising a switching spring connected to the inner side wall of the upper joint, a spring pressure ring connected to one end of the switching spring away from the upper joint, a core shaft arranged between the spring pressure ring and the four-ring groove locking sleeve, a guide drill sleeve threadedly connected to the lower end of the locking cylinder, and a spline cylinder threadedly connected to the lower end of the guide drill sleeve, the two ends of the locking spring are respectively connected to the core shaft and the locking shaft, and the lower end of the core shaft is threadedly connected to the lower joint; and

[0009] A limit drill sleeve, the limit drill sleeve being threadedly connected to the lower end of the spline cylinder;

[0010] Wherein, a buffer gasket is arranged between the upper joint and the locking cylinder.

[0011] Preferably, a plurality of ball grooves are formed at the upper end of the core shaft, the locking ball and the locking ball sleeve are placed in the ball grooves, and the locking shaft, the three-ring groove locking sleeve and the four-ring groove locking sleeve are formed with ring grooves matching the ball grooves.

[0012] Preferably, 12 ball grooves are provided at the upper end of the core shaft, the 12 ball grooves include three groups of ball grooves equidistantly provided along the axial direction of the core shaft, and each group of ball grooves includes four ball grooves evenly distributed along the circumference of the core shaft.

[0013] Preferably, a guide block is provided in the middle of the core shaft, an external spline is processed on the lower end of the core shaft, the upper end of the external spline is opened into a triangle, an internal spline matching the external spline is opened on the spline tube, and a large-sized chamfer is opened on the lower end of the internal spline of the spline tube.

[0014] Preferably, an internal slideway for guiding the movement of the core shaft is provided in the guide drill sleeve, the lower end of the internal slideway is opened as a pointed end, the internal slideway includes a curved guide portion and a linear sliding portion, the guide drill sleeve is radially provided with a pressure relief hole for preventing the formation of a closed volume, and the width of the linear sliding portion of the guide drill sleeve is greater than the width of the guide block on the core shaft.

[0015] Preferably, an adjusting washer is provided between the guide drill sleeve and the spline cylinder for adjusting the length of the threaded connection between the guide drill sleeve and the spline cylinder.

[0016] Preferably, a carbide sleeve, an adjustment sleeve and a flexible adjustment ring are sequentially installed in the limit drill sleeve from bottom to top, and the carbide sleeve, the adjustment sleeve and the flexible adjustment ring are all sleeved on the outer side of the core shaft.

[0017] Preferably, the lower ends of the limiting drill sleeve and the locking cylinder are both provided with O-rings, the lower end of the locking cylinder is provided with a boss for limiting the four-groove locking sleeve and the three-groove locking sleeve, and the O-ring at the lower end of the locking cylinder is arranged at the lower end of the boss.

[0018] Preferably, a separation ring is further provided at the upper end of the core shaft, the separation ring is placed between the core shaft and the spring pressure ring, and a separation ball is provided between the separation ring and the spring pressure ring.

[0019] Preferably, the spring compression ring is arranged in three sections from top to bottom, the upper section is used to straighten the switching spring, the middle section is used to support the end face of the switching spring, and the lower section is provided with a ball groove for installing a separation ball.

[0020] Compared with the prior art, the present invention provides a mechanical drill string torque clutch having the following beneficial effects:

[0021] 1. The mechanical drill string torque clutch lifts and lowers the drill tool through the top drive to achieve torque separation and combination of the upper drill string and the lower drill string. The locking ball can be switched between the locking sleeve ring groove and the locking shaft ring groove by starting and stopping the pump, thereby achieving locking and unlocking of two working modes, which can ensure stable operation of drilling work in the two working modes. During the sliding drilling process, the torque of the upper drill string and the lower drill string can be combined and separated. When the drill string torque is combined, the upper and lower drill strings can be rotated for drilling together. When the drill string torque is separated, the upper drill string can be rotated for drilling, and the lower drill string can be slid for drilling, thereby reducing the friction of the drill string during drilling, effectively solving the "support pressure" problem during sliding drilling in directional drilling, and improving drilling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention when performing torque separation;

[0023] Figure 2 It is a schematic diagram of the overall structure of the present invention when torque is combined;

[0024] Figure 3 It is a cross-sectional view taken along line AA when the torque combination working mode of the present invention is not locked;

[0025] Figure 4 It is a BB cross-sectional view of the present invention under the torque combined working mode;

[0026] Figure 5 It is a cross-sectional view taken along line AA when the torque combined working mode of the present invention is locked;

[0027] Figure 6 It is a CC cross-sectional view of the torque combined working mode of the present invention;

[0028] Figure 7 This is a partial enlarged view of point I in the torque combined working mode of the present invention;

[0029] Figure 8 It is a partial enlarged view of position II under the torque combination working mode of the present invention;

[0030] Fig. 9 It is a schematic diagram of the core shaft structure of the present invention;

[0031] Fig.10 It is a schematic structural diagram of the spline in the spline cylinder of the present invention;

[0032] Fig.11 It is a schematic diagram of the internal slideway structure of the guide drill sleeve of the present invention.

[0033] In the figure: 1. upper joint; 2. switching spring; 3. buffer gasket; 4. four-ring groove locking sleeve; 5. locking cylinder; 6. spring pressure ring; 7. separation ring; 8. separation ball; 9. core shaft; 901. guide block; 902. external spline; 10. locking ball sleeve; 11. locking ball; 12. locking shaft; 13. three-ring groove locking sleeve; 14. locking spring; 15. guide drill sleeve; 151. curve guide part; 152. linear sliding part; 16. spline cylinder; 17. adjustment washer; 18. limit drill sleeve; 19. flexible adjustment ring; 20. adjustment sleeve; 21. carbide sleeve; 22. lower joint. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0035] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installed", "provided with", "mounted / connected", "connected", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two components; for ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] Example: Refer to Figure 1-11 , a mechanical drill string torque clutch, comprising an upper joint 1, and further comprising:

[0038] The mode locking mechanism includes a locking cylinder 5 threadedly connected to the lower end of the upper joint 1, a three-ring groove locking sleeve 13 and a four-ring groove locking sleeve 4 arranged in the locking cylinder 5, a locking shaft 12 arranged in the four-ring groove locking sleeve 4, a locking spring 14 connected to the lower end table of the locking shaft 12, and a locking ball 11 arranged in the ring groove of the four-ring groove locking sleeve 4, and a locking ball sleeve 10 is arranged outside the locking ball 11;

[0039] A mode switching mechanism, the mode switching mechanism includes a switching spring 2 connected to the inner side wall of the upper joint 1, a spring pressure ring 6 connected to the end of the switching spring 2 away from the upper joint 1, a core shaft 9 arranged between the spring pressure ring 6 and the four-ring groove locking sleeve 4, a guide drill sleeve 15 threadedly connected to the lower end of the locking cylinder 5, and a spline cylinder 16 threadedly connected to the lower end of the guide drill sleeve 15, the two ends of the locking spring 14 are respectively connected to the core shaft 9 and the locking shaft 12, and the lower end of the core shaft 9 is threadedly connected to the lower joint 22; and

[0040] A limit drill sleeve 18, which is threadedly connected to the lower end of the spline cylinder 16;

[0041] A buffer gasket 3 is provided between the upper joint 1 and the locking cylinder 5 .

[0042] As a preferred technical solution of the present invention, further, a plurality of ball grooves are provided at the upper end of the mandrel 9, the locking ball 11 and the locking ball sleeve 10 are placed in the ball grooves, and the locking shaft 12, the three-ring groove locking sleeve 13 and the four-ring groove locking sleeve 4 are provided with annular grooves matching the ball grooves. Twelve ball grooves are provided at the upper end of the mandrel 9, and the 12 ball grooves include three groups of ball grooves equidistantly provided along the axial direction of the mandrel 9, and each group of ball grooves includes four ball grooves evenly distributed along the circumference of the mandrel 9. A guide block 901 is provided in the middle of the mandrel 9, and an external spline 902 is processed at the lower end of the mandrel 9, and the upper end of the external spline 902 is provided in a triangular shape, and an internal spline matching the external spline 902 is provided on the spline cylinder 16, and a large-sized chamfer is provided at the lower end of the internal spline of the spline cylinder 16.

[0043] like Figure 2 , Figure 3 and Fig. 9 As shown, ball sleeves are installed in the 12 ball grooves, and the locking ball 11 can roll purely in the locking ball sleeve 10. The locking sleeve is divided into a three-ring groove locking sleeve 13 and a four-ring groove locking sleeve 4. The middle section of the locking shaft 12 is processed with a ring groove according to the size of the locking sleeve ring groove.

[0044] As a preferred technical solution of the present invention, further, an internal slideway for guiding the movement of the mandrel 9 is provided in the guide drill sleeve 15, the lower end of the internal slideway is provided with a pointed tip, the internal slideway includes a curved guide portion 151 and a linear sliding portion 152, and a pressure relief hole for preventing the formation of a closed volume is provided in the radial direction of the guide drill sleeve 15, and the width of the linear sliding portion 152 of the guide drill sleeve 15 is greater than the width of the guide block 901 on the mandrel 9, such as Fig.11 shown.

[0045] As a preferred technical solution of the present invention, further, an adjusting washer 17 is provided between the guide drill sleeve 15 and the spline cylinder 16 for adjusting the length of the threaded connection between the guide drill sleeve 15 and the spline cylinder 16; thereby ensuring that the external spline 902 can be smoothly combined with the internal spline.

[0046] As a preferred technical solution of the present invention, further, a carbide sleeve 21, an adjustment sleeve 20 and a flexible adjustment ring 19 are installed in sequence from bottom to top in the limiting drill sleeve 18, and the carbide sleeve 21, the adjustment sleeve 20 and the flexible adjustment ring 19 are all sleeved on the outside of the core shaft 9; the carbide sleeve 21 can limit and straighten the core shaft 9 in the torque separation working mode.

[0047] As a preferred technical solution of the present invention, further, the lower ends of the limiting drill sleeve 18 and the locking cylinder 5 are both provided with O-rings, the lower end of the locking cylinder 5 is provided with a boss for limiting the four-groove locking sleeve 4 and the three-groove locking sleeve 13, and the O-ring at the lower end of the locking cylinder 5 is arranged at the lower end of the boss; the boss at the lower end of the locking cylinder 5 can limit the four-groove locking sleeve 4 and the three-groove locking sleeve 13, and play a straightening role on the core shaft 9.

[0048] As a preferred technical solution of the present invention, further, a separation ring 7 is provided at the upper end of the mandrel 9, the separation ring 7 is placed between the mandrel 9 and the spring pressure ring 6, a separation ball 8 is provided between the separation ring 7 and the spring pressure ring 6, and the spring pressure ring 6 is sequentially arranged in three sections from top to bottom, the upper section is used to straighten the switching spring 2, the middle section is used to support the end face of the switching spring 2, and the lower section is provided with a ball groove for installing the separation ball 8; Figure 2 , Figure 7 and Figure 8 As shown, the locking shaft 12 is divided into three sections. The ring groove processed in the upper section allows the separation ball 8 to be smoothly installed in the ball groove of the spring pressure ring 6 and allows it to roll purely in the ring groove. The ring groove processed in the middle section allows the locking ball 11 to be smoothly installed in the ball groove of the core shaft 9 and allows it to roll purely in the ring groove. The lower section can play a straightening role on the locking spring 14. It should be noted that the ring groove processed in the upper section is different in size from the ring groove processed in the middle section.

[0049] like Figure 3 and Figure 8As shown, when the torque separation or torque combination working mode needs to be released, the locking spring 14 pushes the locking shaft 12 upward, so that the locking ball 11 falls into the ring groove of the locking shaft 12.

[0050] like Figure 5 and Figure 8 As shown, when the locking torque separation or torque combination working mode is required, the locking shaft 12 compresses the locking spring 14 downward to press the locking ball 11 back into the three-ring groove locking sleeve 13 or the four-ring groove locking sleeve 4.

[0051] During installation, first press the switching spring 2 to the upper joint 1. The switching spring 2 is made of 65Si2MnWA material, which has the characteristics of high yield strength and high allowable shear stress, long service life, and can adapt to the high temperature environment underground. Press the locking cylinder 5 to the lower end face of the upper joint 1, then install 5 four-ring groove locking sleeves 4 and 1 three-ring groove locking sleeve 13 in sequence, screw the locking cylinder 5 and the upper joint 1 together by threading, and screw the guide drill sleeve 15 and the locking cylinder 5 together by threading; then put the locking spring 14 and the locking shaft 12 into the upper end cavity of the core shaft 9, press the separation ring 7 to the upper end face of the locking shaft 12, install the separation ball 8 into the ball groove of the spring pressure ring 6, and then press the spring The ring 6 is sleeved onto the locking shaft 12, and the locking ball sleeve 10 and the locking ball 11 are placed in the ball groove at the upper end of the core shaft 9 in turn. The core shaft 9 is sent in axially and stopped when the guide block 901 contacts the lower tip of the guide slide. The adjusting washer 17 is pressed to the lower end face of the guide drill sleeve 15, and the spline cylinder 16 and the guide drill sleeve 15 are screwed together and fixed by threads. The flexible adjustment ring 19 is sleeved onto the core shaft 9 and pressed to the end face of the spline cylinder 16. Subsequently, the adjusting sleeve 20 and the carbide sleeve 21 are sleeved onto the core shaft 9 in turn, and the limit drill sleeve 18 and the spline cylinder 16 are screwed together and fixed by threads. The O-ring is installed in the sealing groove at the lower end of the limit drill sleeve 18, and finally the lower joint 22 is screwed together and fixed to the core shaft 9 by threads.

[0052] Working principle: The present invention has two working modes, namely, the upper and lower drill string torque separation working mode and the upper and lower drill string torque combination working mode, which respectively correspond to sliding drilling and compound drilling in the drilling process.

[0053] The working process of the torque combination working mode is as follows: first, the pump is stopped to reduce the drilling fluid pressure, the drill bit is lowered to make the mandrel 9 move upward relative to the outer drill sleeve, the locking spring 14 pushes the locking shaft 12 upward, and the locking ball 11 returns to the ring groove of the locking shaft 12, so that the locking ball 11 contacts the ring groove of the locking shaft 12, and the torque separation working mode is released. The guide block 901 of the mandrel 9 moves upward relative to the outer drill sleeve along the inner slideway of the guide drill sleeve 15, so that the mandrel 9 can press upward along the predetermined slideway. The switching spring 2 is compressed. At this time, the outer spline 902 is gradually guided into the spline cylinder 16. When the guide block 901 of the core shaft 9 contacts the rectangular groove at the upper end of the internal slideway of the guide drill sleeve 15, the outer spline 902 is completely combined with the inner spline. At this time, the pump is turned on to increase the drilling fluid pressure, and the locking shaft 12 compresses the locking spring 14 downward. The locking ball 11 is pressed from the locking shaft 12 into the four-ring groove locking sleeve 4, completing the locking of the torque combined working mode, and finally achieving the effect of the upper drill string and the lower drill string rotating together.

[0054] The working process of the torque separation working mode is as follows: first, the pump is stopped to reduce the drilling fluid pressure and lift the drill bit, the locking spring 14 pushes the locking shaft 12 upward, and the locking ball 11 returns to the annular groove of the locking shaft 12, and the torque combination working mode is released. The core shaft 9 moves downward relative to the external drill sleeve under the action of gravity, the elastic force of the switching spring 2 and the guiding action of the guide drill sleeve 15 until the lower end of the outer spline 902 of the core shaft 9 contacts the carbide sleeve 21 and stops moving. At this time, the pump is turned on to increase the drilling fluid pressure, the locking shaft 12 compresses the locking spring 14 downward, and the locking ball 11 is pressed from the locking shaft 12 to the three-groove locking sleeve 13, completing the locking of the torque separation working mode, realizing the effect of sliding drilling of the lower drill string and rotating drilling of the upper drill string, and finally achieving the effect of reducing friction and drag during drilling.

[0055] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A mechanical drill string torque clutch, comprising an upper joint (1), characterized in that: Also includes: A mode locking mechanism, the mode locking mechanism comprising a locking cylinder (5) threadedly connected to the lower end of an upper joint (1), a three-ring groove locking sleeve (13) and a four-ring groove locking sleeve (4) arranged in the locking cylinder (5), a locking shaft (12) arranged in the four-ring groove locking sleeve (4), a locking spring (14) connected to the lower end table of the locking shaft (12), and a locking ball (11) arranged in the ring groove of the four-ring groove locking sleeve (4), wherein a locking ball sleeve (10) is arranged outside the locking ball (11); A mode switching mechanism, the mode switching mechanism comprising a switching spring (2) connected to the inner side wall of an upper joint (1), a spring pressure ring (6) connected to one end of the switching spring (2) away from the upper joint (1), a core shaft (9) arranged between the spring pressure ring (6) and the four-ring groove locking sleeve (4), a guide drill sleeve (15) threadedly connected to the lower end of the locking cylinder (5), and a spline cylinder (16) threadedly connected to the lower end of the guide drill sleeve (15), the two ends of the locking spring (14) are respectively connected to the core shaft (9) and the locking shaft (12), and the lower end of the core shaft (9) is threadedly connected to a lower joint (22); and A limit drill sleeve (18), wherein the limit drill sleeve (18) is threadedly connected to the lower end of the spline cylinder (16); Wherein, a buffer gasket (3) is provided between the upper joint (1) and the locking cylinder (5).

2. A mechanical drill string torque clutch according to claim 1, characterized in that: The upper end of the core shaft (9) is provided with a plurality of ball grooves, the locking ball (11) and the locking ball sleeve (10) are placed in the ball grooves, and the locking shaft (12), the three-ring groove locking sleeve (13) and the four-ring groove locking sleeve (4) are provided with ring grooves matching the ball grooves.

3. A mechanical drill string torque clutch according to claim 2, characterized in that: The upper end of the core shaft (9) is provided with 12 ball grooves, the 12 ball grooves include three groups of ball grooves equidistantly provided along the axial direction of the core shaft (9), and each group of ball grooves includes four ball grooves evenly distributed along the circumference of the core shaft (9).

4. A mechanical drill string torque clutch according to claim 3, characterized in that: A guide block (901) is arranged in the middle of the core shaft (9), an external spline (902) is processed at the lower end of the core shaft (9), the upper end of the external spline (902) is opened into a triangle, an internal spline matching the external spline (902) is opened on the spline cylinder (16), and a large-sized chamfer is opened at the lower end of the internal spline of the spline cylinder (16).

5. A mechanical drill string torque clutch according to claim 4, characterized in that: An internal slideway for guiding the movement of the core shaft (9) is provided in the guide drill sleeve (15), the lower end of the internal slideway is provided with a pointed tip, the internal slideway comprises a curved guide portion (151) and a linear sliding portion (152), a pressure relief hole for preventing the formation of a closed volume is provided in the radial direction of the guide drill sleeve (15), and the width of the linear sliding portion (152) of the guide drill sleeve (15) is greater than the width of the guide block (901) on the core shaft (9).

6. A mechanical drill string torque clutch according to claim 5, characterized in that: An adjusting washer (17) is provided between the guide drill sleeve (15) and the spline cylinder (16) for adjusting the length of the threaded connection between the guide drill sleeve (15) and the spline cylinder (16).

7. A mechanical drill string torque clutch according to claim 1, characterized in that: A hard alloy sleeve (21), an adjustment sleeve (20) and a flexible adjustment ring (19) are sequentially installed in the limit drill sleeve (18) from bottom to top, and the hard alloy sleeve (21), the adjustment sleeve (20) and the flexible adjustment ring (19) are all sleeved on the outer side of the core shaft (9).

8. A mechanical drill string torque clutch according to claim 7, characterized in that: The lower ends of the limiting drill sleeve (18) and the locking cylinder (5) are both provided with O-rings, the lower end of the locking cylinder (5) is provided with a boss for limiting the four-ring groove locking sleeve (4) and the three-ring groove locking sleeve (13), and the O-ring at the lower end of the locking cylinder (5) is arranged at the lower end of the boss.

9. A mechanical drill string torque clutch according to claim 1, characterized in that: A separation ring (7) is also provided at the upper end of the core shaft (9), and the separation ring (7) is placed between the core shaft (9) and the spring pressure ring (6), and a separation ball (8) is provided between the separation ring (7) and the spring pressure ring (6).

10. A mechanical drill string torque clutch according to claim 9, characterized in that: The spring compression ring (6) is arranged in three sections from top to bottom, the upper section is used to straighten the switching spring (2), the middle section is used to support the end surface of the switching spring (2), and the lower section is provided with a ball groove for installing a separation ball (8).

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