Drilling tool clutch tool capable of controlling rotating speed

Abstract

The invention relates to the technical field of oil and gas drilling, in particular to a rotating speed controlled drilling tool clutch tool, and aims to solve the problem of high supporting pressure caused by non-rotation of a drilling rod in current drilling operation. The invention provides a rotating speed controlled drilling tool clutch tool. The rotating speed controlled drilling tool clutch tool comprises an upper connector, a central pipe, a transmission block assembly, a spline housing, a middle connector, a lower connector, a bearing pack and a transmission mandrel. The upper joint, the spline housing, the middle joint and the lower joint are in coaxial threaded connection from top to bottom; an arc block extends out of the upper end of the spline sleeve and extends into the circular groove, and a first spline groove and a second spline groove are formed in the spline sleeve; the bearing set is arranged between the lower connector and the transmission mandrel, and the lower connector can rotate relative to the transmission mandrel. The upper portion of the first spline rod can extend into the first spline groove, the lower portion of the first spline rod can extend into the third spline groove, the upper portion of the second spline rod 3021 can extend into the second spline groove, and the lower portion of the second spline rod 3021 can extend into the fourth spline groove.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas drilling, and in particular to a rotation speed controlled drilling tool clutch tool. Background Art

[0002] With the deepening of exploration and development, directional wells account for an increasing proportion, especially for the efficient development of unconventional oil and gas, horizontal well drilling has become a necessary means. Directional well drilling operations require frequent directional drilling to control the wellbore trajectory. The conventional bent screw drill bit assembly does not rotate the drill pipe during directional drilling, and the drill pipe and the well wall are in a static friction state. The drilling pressure is difficult to transmit to the drill bit, resulting in a "support pressure" phenomenon, resulting in low mechanical drilling speed, unstable tool face, easy drill jamming, etc., which seriously restricts the efficiency of drilling development.

[0003] To solve the problem of directional drilling pressure, existing conventional technologies include: wellbore structure optimization, wellbore trajectory optimization, adding lubricants and small balls to drilling fluid, etc. However, the above technologies have certain limitations, such as: trajectory optimization can only minimize the directional well section and the number of directional drillings; lubricants are generally prohibited in the target layer because they affect the fluorescence display results, and the lubricant has limited effect in alleviating pressure. It is becoming more and more common to use hydraulic oscillators to alleviate directional pressure. The use of this tool can convert the static friction of part of the drill bit into dynamic friction during directional drilling, which can have a certain effect, but the drill string is still in a static state, and the problem of drill bit pressure is still obvious. Summary of the invention

[0004] The purpose of the present invention is to provide a rotation speed controlled drilling tool clutch tool to solve the problem of high support pressure caused by non-rotation of the drill rod in current drilling operations.

[0005] In order to solve the above technical problems, the technical solution provided by the present invention is:

[0006] A speed-controlled drilling tool clutch tool comprises: an upper joint, a center pipe, a transmission block assembly, a spline sleeve, a middle joint, a lower joint, a transmission mandrel and a bearing assembly;

[0007] The upper joint, spline sleeve, middle joint and lower joint are coaxially threadedly connected from top to bottom;

[0008] The upper part of the central tube is inserted into the upper joint, the outer side of the upper part of the central tube is set as a large circular ring structure, the outer side of the middle and lower part of the central tube is set as a small circular ring structure, and the lower end of the large circular ring structure is provided with a circular groove;

[0009] An arc block extends from the upper end of the spline sleeve, the arc block extends into the circular groove, and the spline sleeve is provided with a first spline groove and a second spline groove;

[0010] The transmission block assembly is sleeved on the outside of the central tube, and the transmission block assembly includes a first transmission block and a second transmission block, the first transmission block is connected to the central tube through a first upper screw spring assembly and a first lower screw spring assembly, the first transmission block is provided with a first spline rod, the second transmission block is connected to the central tube through a second upper screw spring assembly and a second lower screw spring assembly, and the second transmission block is provided with a first spline rod;

[0011] The upper part of the transmission mandrel passes through the lower joint and extends into the middle joint, and the transmission mandrel is provided with a third spline groove and a fourth spline groove;

[0012] The bearing assembly is disposed between the lower joint and the transmission spindle, and the lower joint can rotate relative to the transmission spindle;

[0013] The upper portion of the first spline rod can extend into the first spline groove, the lower portion of the first spline rod can extend into the third spline groove, the upper portion of the second spline rod can extend into the second spline groove, and the lower portion of the second spline rod can extend into the fourth spline groove.

[0014] Further, the first upper screw-spring assembly includes a first upper fixing screw and a first upper spring;

[0015] The first upper fixing screw passes through the upper part of the first transmission block and is connected to the central tube; the first upper spring is sleeved outside the first upper fixing screw and is configured as a compression spring;

[0016] The first lower screw-spring assembly includes a first lower fixing screw and a first lower spring;

[0017] The first lower fixing screw passes through the lower part of the first transmission block and is connected to the central tube. The first lower spring is sleeved on the outside of the first lower fixing screw and is configured as a compression spring.

[0018] Further, the second upper screw-spring assembly includes a second upper fixing screw and a second upper spring;

[0019] The second upper fixing screw passes through the upper part of the second transmission block and is connected to the central tube; the second upper spring is sleeved outside the second upper fixing screw and is configured as a compression spring;

[0020] The second lower screw-spring assembly includes a second lower fixing screw and a second lower spring;

[0021] The second lower fixing screw passes through the lower part of the second transmission block and is connected to the central tube. The second lower spring is sleeved on the outside of the second lower fixing screw and is configured as a compression spring.

[0022] Furthermore, the rotation speed controlled drilling tool clutch tool further comprises a fixing sleeve;

[0023] The fixing sleeve is installed on the outer side of the upper end of the transmission core shaft.

[0024] Furthermore, the rotation speed controlled drilling tool clutch tool further comprises an open ring;

[0025] The open ring is installed on the outer groove of the upper part of the transmission core shaft.

[0026] Furthermore, the rotation speed controlled drilling tool clutch tool also includes a flow tube;

[0027] The upper end of the flow tube is connected to the lower end of the central tube through threads.

[0028] Furthermore, the rotation speed controlled drilling tool clutch tool further comprises a bearing seat;

[0029] The bearing seat is arranged between the lower joint and the transmission spindle, and is arranged above the bearing group.

[0030] Furthermore, a dynamic sealing assembly is provided between the lower inner cavity of the lower joint and the transmission core shaft.

[0031] Furthermore, a sealing ring J group is arranged between the upper joint and the central tube.

[0032] Furthermore, a sealing ring group M is arranged between the flow cylinder and the transmission core shaft.

[0033] Based on the above technical solutions, the technical effects that can be achieved by the present invention are:

[0034] The invention provides a rotation speed controlled drilling tool clutch tool which is installed between a lower drilling tool assembly (BHA) and an upper drill pipe. The rotation speed is adjusted to control the transmission of torque between the upper and lower parts of the tool. During composite drilling, the upper part of the first spline rod extends into the first spline groove, the upper part of the second spline rod extends into the second spline groove, the lower part of the first spline rod extends into the third spline groove, and the lower part of the second spline rod extends into the fourth spline groove. The tool transmits torque. During directional drilling, the lower part of the first spline rod withdraws from the third spline groove, the lower part of the second spline rod withdraws from the fourth spline groove, the upper part of the first spline rod withdraws from the first spline groove, and the upper part of the second spline rod withdraws from the second spline groove. No torque is transmitted between the upper and lower drilling tools of the tool. Directional operation is performed when the upper drill pipe rotates at a low speed. Static friction is converted into rolling friction, which is beneficial to improving the drilling pressure transmission efficiency, improving the wellbore cleaning condition, and increasing the mechanical drilling speed. The problem of large supporting pressure caused by the non-rotation of the drill pipe in current drilling operations is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 A schematic diagram of the internal structure of a rotation speed controlled drilling tool clutch tool provided by an embodiment of the present invention;

[0037] Figure 2 A cross-sectional view of a rotation speed controlled drilling tool clutch tool provided by an embodiment of the present invention at a low rotation speed or no rotation;

[0038] Figure 3 A cross-sectional view of a rotation speed controlled drilling tool clutch tool provided by an embodiment of the present invention at a low rotation speed or no rotation;

[0039] Figure 4 A cross-sectional view of a rotation speed controlled drilling tool clutch tool at a high rotation speed provided by an embodiment of the present invention;

[0040] Figure 5 A cross-sectional view of a rotation speed controlled drilling tool clutch tool at a high rotation speed provided by an embodiment of the present invention;

[0041] Figure 6 It is an enlarged view of the first upper screw-spring assembly and the second upper screw-spring assembly.

[0042] Icons: 1-upper joint; 101-small step; 102-large step; 2-center tube; 3-transmission block assembly; 301-first transmission block; 3011-first spline rod; 302-second transmission block; 3021-second spline rod; 4-spline sleeve; 401-first spline groove; 402-second spline groove; 403-arc block; 5-middle joint; 6-fixing sleeve; 7-opening ring; 8-lower joint; 9-bearing seat; 10-flow tube; 11-bearing group; 12-transmission mandrel ;1201-third spline groove;1202-fourth spline groove;13-sealing ring J group;14-first upper screw-spring assembly;1401-first upper fixing screw;1402-first upper spring;15-first lower screw-spring assembly;16-second upper screw-spring assembly;1601-second upper fixing screw;1602-second upper spring;17-second lower screw-spring assembly;18-oil filling hole;19-sealing ring K group;20-sealing ring M group;21-dynamic seal assembly. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, 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. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0044] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0046] The present invention provides a drilling tool clutch tool for speed control, comprising: an upper joint 1, a center tube 2, a transmission block assembly 3, a spline sleeve 4, a middle joint 5, a lower joint 8, a bearing group 11, and a transmission mandrel 12; the upper joint 1, the spline sleeve 4, the middle joint 5, and the lower joint 8 are coaxially threadedly connected from top to bottom; the upper part of the center tube 2 is inserted into the upper joint 1, the outer side of the upper part of the center tube 2 is set as a large circular ring structure, the outer side of the middle and lower part of the center tube 2 is set as a small circular ring structure, and the lower end of the large circular ring structure is provided with a circular groove; an arc block 403 extends from the upper end of the spline sleeve 4, the arc block 403 extends into the circular groove, and the spline sleeve 4 is provided with a first spline groove 401 and a second spline groove 402; the transmission block assembly 3 is sleeved on the outside of the center tube 2, and the transmission block assembly 3 includes a first transmission block 301 and a second transmission block 302, and the first transmission block 301 is connected by a first upper screw spring assembly 14 and a first lower screw spring assembly 1 5 is connected to the central tube 2, the first transmission block 301 is provided with a first spline rod 3011, the second transmission block 302 is connected to the central tube 2 through the second upper screw spring assembly 16 and the second lower screw spring assembly 17, and the second transmission block 302 is provided with a second spline rod 3021; ​​the upper part of the transmission mandrel 12 passes through the lower joint 8 and extends into the middle joint 5, and the transmission mandrel 12 is provided with a third spline groove 1201 and a fourth spline groove 1202; the bearing group 11 is arranged between the lower joint 8 and the transmission mandrel 12, and the lower joint 8 can rotate relative to the transmission mandrel 12; the upper part of the first spline rod 3011 can extend into the first spline groove 401, the lower part of the first spline rod 3011 can extend into the third spline groove 1201, the upper part of the second spline rod 3021 can extend into the second spline groove 402, and the lower part of the second spline rod 3021 can extend into the fourth spline groove 1202.

[0047] The present invention provides a speed-controlled drilling tool clutch tool installed between a lower drilling tool assembly (BHA) and an upper drill pipe. The speed is adjusted to control the transmission of torque between the upper and lower parts of the tool. During compound drilling, the upper part of the first spline rod 3011 extends into the first spline groove 401, the upper part of the second spline rod 3021 extends into the second spline groove 402, the lower part of the first spline rod 3011 extends into the third spline groove 1201, and the lower part of the second spline rod 3021 extends into the fourth spline groove 1202. The tool transmits torque. During directional drilling, the lower part of the first spline rod 3011 extends into the third spline groove 1201, and the lower part of the second spline rod 3021 extends into the fourth spline groove 1202. The drill bit 3021 partially withdraws from the third spline groove 1201, the lower part of the second spline rod 3021 withdraws from the fourth spline groove 1202, the upper part of the first spline rod 3011 withdraws from the first spline groove 401, and the upper part of the second spline rod 3021 withdraws from the second spline groove 402. No torque is transmitted between the upper and lower drill bits of the tool, so that directional operation can be carried out under the condition of low-speed rotation of the upper drill rod, and static friction is converted into rolling friction, which is beneficial to improving the drilling pressure transmission efficiency, improving the wellbore cleaning condition, and increasing the mechanical drilling speed, and solves the problem of high support pressure caused by the non-rotation of the drill rod in current drilling operations.

[0048] The following combination Figure 1-Figure 6 The structure and shape of the rotation speed controlled drilling tool clutch tool provided in this embodiment are described in detail.

[0049] The upper joint 1, the spline sleeve 4, the middle joint 5 and the lower joint 8 are coaxially threadedly connected from top to bottom.

[0050] Regarding the shape and structure of the upper joint 1, in detail:

[0051] Reference Figure 1 The inner side of the upper part of the upper joint 1 is a tapered thread, the lower end of the tapered thread is a small boss with a smaller inner diameter, the lower end of the small boss is a large boss with a larger inner diameter, the large boss extends downward to the root of the tapered thread on the inner side of the lower end of the upper joint 1, and a small step 101 is formed in the circumferential direction at the point where the inner diameter suddenly changes between the small boss and the large boss, and a large step 102 is formed in the circumferential direction at the point where the inner diameter suddenly changes between the large boss and the root of the tapered thread.

[0052] Regarding the shape and structure of the central tube 2, in detail:

[0053] Reference Figure 1 The upper part of the central tube 2 is inserted into the upper joint 1, the outer side of the upper part of the central tube 2 is set as a large circular ring structure, the outer side of the middle and lower part of the central tube 2 is set as a small circular ring structure, and a circular groove is opened at the lower end of the large circular ring structure.

[0054] Specifically, the outer side of the upper part of the center tube 2 is a large circular ring structure with a larger outer diameter, and two groups of circular grooves are arranged at the lower end of the large circular ring structure. The outer side of the middle and lower part is a small circular ring structure with a smaller outer diameter, and the outer side of the lower end is an external thread. The inner side of the upper part of the center tube 2 is a tapered structure with a gradually reduced inner diameter, and the lower end of the tapered structure is a through hole with a certain inner diameter. The upper end of the center tube 2 is installed at the small step 101 formed between the large boss and the small boss of the upper joint 1, and the large circular ring structure on the outer side of the upper part of the center tube 2 and the large boss of the upper joint 1 are sealed by a sealing ring J group 13.

[0055] Regarding the shape and structure of the spline sleeve 4, in detail:

[0056] Reference Figure 1 Conical threads are arranged on the outer side of the upper part and the inner side of the lower end of the spline sleeve 4. Two groups of arc blocks 403 with a certain length are extended axially from the upper end of the spline sleeve 4. The arc blocks 403 correspond to the two groups of circular grooves at the lower end of the large circular ring structure of the center tube 2. The arc blocks 403 extend into the circular grooves. The spline sleeve 4 is provided with a first spline groove 401 and a second spline groove 402.

[0057] Regarding the shape and structure of the transmission block assembly 3, in detail:

[0058] Reference Figure 1 The transmission block assembly 3 is sleeved on the outside of the central tube 2. The transmission block assembly 3 includes a first transmission block 301 and a second transmission block 302. The first transmission block 301 is installed on the outer side of the lower middle part of the central tube 2 through a first upper screw spring assembly 14 and a first lower screw spring assembly 15. The first transmission block 301 is provided with a first spline rod 3011.

[0059] Specifically, the main body of the first transmission block 301 is a semicircular ring, and multiple groups (such as 3 groups) of first spline rods 3011 are arranged on the outer side of the middle part of the semicircular ring. The upper part of the first spline rod 3011 cooperates with the first spline groove 401. The upper and lower parts of the semicircular ring are respectively provided with small holes perpendicular to the ring for installing the first upper screw spring assembly 14 and the first lower screw spring assembly 15.

[0060] The second transmission block 302 is installed on the outer side of the lower middle part of the central tube 2 through the second upper screw-spring assembly 16 and the second lower screw-spring assembly 17 . The second transmission block 302 is provided with a second spline rod 3021 .

[0061] Specifically, the main body of the second transmission block 302 is a semicircular ring, and multiple groups (such as 3 groups) of second spline rods 3021 are arranged on the outer side of the middle part of the semicircular ring. The upper part of the second spline rod 3021 cooperates with the second spline groove 402. The upper and lower parts of the semicircular ring are respectively provided with small holes perpendicular to the ring for installing the second upper screw spring assembly 16 and the second lower screw spring assembly 17.

[0062] The upper portion of the first spline rod 3011 can extend into the first spline groove 401 , the lower portion of the first spline rod 3011 can extend into the third spline groove 1201 , the upper portion of the second spline rod 3021 can extend into the second spline groove 402 , and the lower portion of the second spline rod 3021 can extend into the fourth spline groove 1202 .

[0063] Regarding the shapes and structures of the first upper screw spring assembly 14, the first lower screw spring assembly 15, the second upper screw spring assembly 16 and the second lower screw spring assembly 17, in detail:

[0064] Reference Figure 1 and Figure 4 The first upper screw-spring assembly 14 includes a first upper fixing screw 1401 and a first upper spring 1402. The first upper fixing screw 1401 passes through the upper part of the first transmission block 301. The bottom end of the first upper fixing screw 1401 is installed on the small circular ring structure on the outer side of the middle part of the central tube 2. The first upper spring 1402 is sleeved on the outside of the first upper fixing screw 1401. The first upper spring 1402 is installed between the first upper fixing screw 1401 and the small circular ring structure on the outer side of the middle part of the central tube 2 and is in a slightly compressed state.

[0065] The second upper screw-spring assembly 16 includes a second upper fixing screw 1601 and a second upper spring 1602. The second upper fixing screw 1601 passes through the upper part of the second transmission block 302. The bottom end of the second upper fixing screw 1601 is installed on the small circular ring structure on the outer side of the middle part of the central tube 2. The second upper spring 1602 is sleeved on the outside of the second upper fixing screw 1601. The second upper spring 1602 is installed between the second upper fixing screw 1601 and the small circular ring structure on the outer side of the middle part of the central tube 2 and is in a slightly compressed state.

[0066] The first lower screw-spring assembly 15 includes a first lower fixing screw and a first lower spring. The first lower fixing screw passes through the lower part of the first transmission block 301. The bottom end of the first lower fixing screw is installed on the small circular ring structure on the outer side of the lower part of the central tube 2. The first lower spring is sleeved on the outside of the first lower fixing screw. The first lower spring is installed between the first lower fixing screw and the small circular ring structure on the outer side of the lower part of the central tube 2 and is in a slightly compressed state.

[0067] The second lower screw-spring assembly 17 includes a second lower fixing screw and a second lower spring. The second lower fixing screw passes through the lower part of the second transmission block 302. The bottom end of the second lower fixing screw is installed on the small circular ring structure on the outer side of the lower part of the central tube 2. The second lower spring is sleeved on the outside of the second lower fixing screw. The second lower spring is installed between the second lower fixing screw and the small circular ring structure on the outer side of the lower part of the central tube 2 and is in a slightly compressed state.

[0068] Regarding the shape and structure of the middle joint 5, in detail:

[0069] An oil filling hole 18 is arranged in the middle of the middle joint 5, and is sealed after the oil filling is completed.

[0070] Regarding the shape and structure of the transmission mandrel 12, in detail:

[0071] The upper part of the transmission core shaft 12 passes through the lower joint 8 and extends into the middle joint 5. The inner side of the upper part of the transmission core shaft 12 is a spline sleeve structure. The transmission core shaft 12 is provided with a third spline groove 1201 and a fourth spline groove 1202. The inner side of the middle part of the transmission core shaft 12 is a large through hole with a larger inner diameter, and the inner side of the lower part is a small through hole with a smaller inner diameter. A thread is arranged on the outer side of the upper end, and a groove is provided at the lower end of the thread. The lower end of the groove is a first circular ring structure with a smaller outer diameter. The outer side of the middle part is a second circular ring structure with a slightly larger outer diameter, and a step surface is formed at the sudden change of the outer diameters of the first circular ring structure and the second circular ring structure.

[0072] Regarding the shape and structure of the lower joint 8, in detail:

[0073] A dynamic sealing assembly 21 is arranged between the lower inner cavity of the lower joint 8 and the second circular ring structure on the outer side of the middle part of the transmission core shaft 12 .

[0074] Regarding the shape and structure of the bearing assembly 11 and the bearing seat 9, in detail:

[0075] The bearing group 11 is arranged between the lower joint 8 and the transmission spindle 12, and the lower joint 8 can rotate relative to the transmission spindle 12. The bearing seat 9 is arranged between the lower joint 8 and the transmission spindle 12 and is arranged above the bearing group 11. The bearing seat 9 and the lower joint 8 are sealed by the sealing ring K group 19.

[0076] Regarding the shape and structure of the flow tube 10, in detail

[0077] The inner side of the upper end of the flow tube 10 is threaded, the inner side of the lower part is a through hole, the outer side of the upper part is a circular ring structure with a smaller outer diameter, and the outer side of the lower part is a circular ring structure with a larger outer diameter. The upper end of the flow tube 10 is connected to the lower end of the central tube 2 through threads. A sealing ring M group 20 is arranged between the flow tube 10 and the transmission core shaft 12.

[0078] Regarding the shape and structure of the open ring 7 and the fixed sleeve 6, in detail:

[0079] The open ring 7 is installed at the outer groove of the upper part of the transmission core shaft 12 to prevent the transmission core shaft 12 from falling. The fixed sleeve 6 is installed on the outer side of the upper end of the transmission core shaft 12.

[0080] The working process of the speed-controlled drilling tool clutch provided in this embodiment is as follows:

[0081] This embodiment is connected between the lower drilling assembly (BHA) and the upper drill pipe, referring to Figure 2 and Figure 3During compound drilling, the top drive / rotary table applies torque to the drill pipe at the wellhead to make the drill pipe reach a certain speed (such as 60-80rmp). At this time, the embodiment rotates along the central axis at a relatively high speed together with the drill pipe. The central pipe 2 is driven by the arc block 403 at the upper end of the spline sleeve 4 to rotate along the central axis at the same speed. The transmission block assembly 3 is subjected to a centrifugal force perpendicular to the central axis and directed outward; according to the centrifugal force calculation formula F=mv 2 / r, where F is centrifugal force, unit N; m is mass, unit kg; v is speed, unit m / s; r is centrifugal motion radius, unit m. When the rotation speed is high, the first transmission block 301 and the second transmission block 302 are subjected to high centrifugal force. When the centrifugal force is greater than the spring force perpendicular to the central axis inward generated by the first upper screw spring assembly 14, the second upper screw spring assembly 16 and the first lower screw spring assembly 15, the second lower screw spring assembly 17, the first transmission block 301 and the second transmission block 302 will move outward perpendicular to the axial direction, and the spline rods on the outside of the first transmission block 301 and the second transmission block 302 move outward into the inner groove of the spline sleeve 4, specifically, the upper part of the first spline rod 3011 enters the first spline groove 401, and the upper part of the second spline rod 3021 enters the second spline groove 402; the first transmission block 301 and the second transmission block 302 move outward perpendicular to the axial direction, and when the top end of the spline rod on the transmission block assembly 3 abuts against the inner boss of the transmission spindle 12, the boss and the top end of the spline rod Both are designed with a structure with a certain inclination angle. Therefore, as the centrifugal force increases, the first transmission block 301 and the second transmission block 302 further move outward perpendicular to the axial direction, which will drive the spline rod to enter the spline groove inside the transmission core shaft 12. Specifically, the lower part of the first spline rod 3011 enters the third spline groove 1201, and the lower part of the second spline rod 3021 enters the fourth spline groove 1202; in this way, the spline rods on the outside of the first transmission block 301 and the second transmission block 302 are respectively engaged with the inner groove of the spline sleeve 4 and the inner spline groove of the transmission core shaft 12 at the upper and lower parts, and the torque transmitted from the upper drill pipe is transmitted to the lower drill bit assembly via the upper joint 1, the spline sleeve 4, the transmission block assembly 3, and the transmission core shaft 12. Therefore, normal transmission of torque is achieved during compound drilling.

[0082] During directional drilling, the rotation speed is gradually reduced, and the centrifugal force on the first transmission block 301 and the second transmission block 302 is continuously reduced. The centrifugal force is smaller than the spring force perpendicular to the central axis inwardly generated by the first and second upper screw spring assemblies 16 and the first and second lower screw spring assemblies 17. The first transmission block 301 and the second transmission block 302 will move inwardly perpendicular to the axial direction, and the spline rods on the outer sides of the first transmission block 301 and the second transmission block 302 will shrink inwardly and gradually withdraw from the inner groove of the spline sleeve 4 and the inner spline groove of the transmission core shaft 12. Specifically, the lower part of the first spline rod 3011 withdraws from the third spline groove 1201, and the second spline rod 30 21 exits from the fourth spline groove 1202, the upper part of the first spline rod 3011 exits from the first spline groove 401, and the upper part of the second spline rod 3021 exits from the second spline groove 402; in this way, when the outer spline rods of the first transmission block 301 and the second transmission block 302 exit from the inner groove of the spline sleeve 4 and the inner spline groove of the transmission core shaft 12 at the upper and lower parts respectively, the torque transmitted from the upper drill rod is no longer transmitted downward to the lower drilling tool assembly, and the counter torque generated by the drill bit breaking rock and the screw drilling tool is reduced through the lower drilling tool assembly until it is transmitted to the present invention and reduced to zero, so that the upper drilling tool rotates while the lower drilling tool does not rotate during directional drilling.

[0083] The speed-controlled drill clutch tool provided in this embodiment has a simple tool structure. Through the transmission of torque by the ground speed control tool, during directional drilling, the upper drill pipe rotates while the lower drill assembly does not rotate, and the static friction between the drill pipe and the well wall is converted into rolling friction, solving the problem of high support pressure caused by the non-rotation of the drill pipe. The speed-controlled drill clutch tool provided in this embodiment can effectively improve the mechanical drilling speed of directional drilling, achieve partial effects of rotary guidance at a relatively economical price, and has a wide range of application.

[0084] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A speed-controlled drilling tool clutch, characterized in that: include: An upper joint (1), a center tube (2), a transmission block assembly (3), a spline sleeve (4), a middle joint (5), a lower joint (8), a transmission spindle (12) and a bearing assembly (11); The upper joint (1), the spline sleeve (4), the middle joint (5), and the lower joint (8) are coaxially threadedly connected from top to bottom; The upper part of the central tube (2) is inserted into the upper joint (1), the outer side of the upper part of the central tube (2) is arranged as a large circular ring structure, the outer side of the middle and lower part of the central tube (2) is arranged as a small circular ring structure, and the lower end of the large circular ring structure is provided with a circular groove; An arc block (403) extends from the upper end of the spline sleeve (4), the arc block (403) extends into the circular groove, and the spline sleeve (4) is provided with a first spline groove (401) and a second spline groove (402); The transmission block assembly (3) is sleeved on the outside of the central tube (2), and the transmission block assembly (3) comprises a first transmission block (301) and a second transmission block (302), the first transmission block (301) is connected to the central tube (2) via a first upper screw spring assembly (14) and a first lower screw spring assembly (15), the first transmission block (301) is provided with a first spline rod (3011), the second transmission block (302) is connected to the central tube (2) via a second upper screw spring assembly (16) and a second lower screw spring assembly (17), and the second transmission block (302) is provided with a second spline rod (3021); The upper portion of the transmission core shaft (12) passes through the lower joint (8) and extends into the middle joint (5), and the transmission core shaft (12) is provided with a third spline groove (1201) and a fourth spline groove (1202); The bearing group (11) is arranged between the lower joint (8) and the transmission core shaft (12), and the lower joint (8) is capable of rotating relative to the transmission core shaft (12); The upper part of the first spline rod (3011) can extend into the first spline groove (401), the lower part of the first spline rod (3011) can extend into the third spline groove (1201), the upper part of the second spline rod (3021) can extend into the second spline groove (402), and the lower part of the second spline rod (3021) can extend into the fourth spline groove (1202).

2. The speed-controlled drilling tool clutch tool according to claim 1, characterized in that: The first upper screw-spring assembly (14) comprises a first upper fixing screw (1401) and a first upper spring (1402); The first upper fixing screw (1401) passes through the upper part of the first transmission block (301) and is connected to the central tube (2); the first upper spring (1402) is sleeved on the outside of the first upper fixing screw (1401) and is configured as a compression spring; The first lower screw-spring assembly (15) comprises a first lower fixing screw and a first lower spring; The first lower fixing screw passes through the lower part of the first transmission block (301) and is connected to the central tube (2); the first lower spring is sleeved outside the first lower fixing screw and is configured as a compression spring.

3. The speed-controlled drilling tool clutch tool according to claim 1, characterized in that: The second upper screw-spring assembly (16) comprises a second upper fixing screw (1601) and a second upper spring (1602); The second upper fixing screw (1601) passes through the upper part of the second transmission block (302) and is connected to the central tube (2); the second upper spring (1602) is sleeved on the outside of the second upper fixing screw (1601) and is configured as a compression spring; The second lower screw-spring assembly (17) comprises a second lower fixing screw and a second lower spring; The second lower fixing screw passes through the lower part of the second transmission block (302) and is connected to the central tube (2); the second lower spring is sleeved outside the second lower fixing screw and is configured as a compression spring.

4. The rotation speed controlled drilling tool clutch tool according to claim 1, characterized in that: Also includes a fixing sleeve (6); The fixing sleeve (6) is installed on the outer side of the upper end of the transmission core shaft (12).

5. The rotation speed controlled drilling tool clutch tool according to claim 1, characterized in that: Also includes an open ring (7); The open ring (7) is installed on the outer groove of the upper part of the transmission core shaft (12).

6. The rotation speed controlled drilling tool clutch tool according to claim 1, characterized in that: Also includes a flow tube (10); The upper end of the flow tube (10) is connected to the lower end of the central tube (2) via threads.

7. The rotation speed controlled drilling tool clutch tool according to claim 1, characterized in that: Also includes a bearing seat (9); The bearing seat (9) is arranged between the lower joint (8) and the transmission core shaft (12), and is arranged above the bearing group (11).

8. The rotation speed controlled drilling tool clutch tool according to claim 1, characterized in that: A dynamic sealing assembly (21) is provided between the lower inner cavity of the lower joint (8) and the transmission core shaft (12).

9. The rotation speed controlled drilling tool clutch tool according to claim 1, characterized in that: A sealing ring group J (13) is provided between the upper joint (1) and the central pipe (2).

10. The rotation speed controlled drilling tool clutch tool according to claim 6, characterized in that: A sealing ring group M (20) is arranged between the flow cylinder (10) and the transmission core shaft (12).

Images