Shaft-torsion coupling impact screw, PDC drill bit and drilling tool

Abstract

The invention discloses a shaft-torsion coupling impact screw, a PDC drill bit and a drilling tool. The drilling tool comprises the shaft-torsion coupling impact screw and the PDC drill bit which are connected. The shaft-torsion coupling impact screw rod comprises a power screw rod unit used for providing power under the action of a fluid medium; the torsional impact screw unit is connected to the output end of the power screw unit and used for providing torsional impact force; the shaft impact screw unit is connected to the output end of the torsion impact screw unit and used for providing axial impact force; and the like. The PDC drill bit comprises a drill bit base body, the head of the drill bit base body axially extends to form an impact hammer base body, and a plurality of vibration impact teeth are arranged on the impact hammer base body at intervals. The cutting blades are arranged at intervals in the circumferential direction of the drill bit base body, and a plurality of cutting teeth are arranged on each cutting blade at intervals. According to the drilling tool, the shaft-torsion coupling impact screw and the PDC drill bit are combined, and the drilling tool has the advantages of being large in torque and axial impact force output and high in hard rock stratum drilling speed.

Description

Technical Field

[0001] The invention relates to the technical field of oil drilling speed-up, and in particular to an axial-torsion coupling impact screw, a PDC drill bit and a drilling tool. Background Art

[0002] With the increasing efforts in exploration and development, advancing into the deep earth and developing deep and ultra-deep oil, gas and geothermal resources are of great significance to ensuring energy security. However, in deep and ultra-deep drilling projects, there are generally problems such as high rock hardness, poor formation drillability, low rock breaking efficiency, slow mechanical drilling speed, and difficulty in efficient well completion. Therefore, improving rock breaking efficiency has always been a difficulty and focus of research.

[0003] At present, in the process of deep and ultra-deep drilling, drill pipe bending and pressure, drill bit sticking and other phenomena often occur, which seriously affect the drilling cycle. In order to solve this problem, a variety of impact tools have also appeared on the market, such as rotary impact tools, torque impactors and composite impactors. The power source of these tools mostly comes from the hydraulic reversing mechanism, and they often have the characteristics of insufficient power and unstable operation. As the most commonly used downhole power drilling tool in oil drilling, screw drilling tools have the characteristics of stable working efficiency and long service life. By combining impact tools with screw drilling tools, the problems of low efficiency and instability of impact tools can be solved, the advantages of impact tools can be brought into play, and drilling efficiency can be improved. However, with the increase of impact load, the working life of the lower PDC drill bit is greatly challenged. Under impact load, conventional PDC drill bits often suffer from PDC drill bit damage, destruction or even cracking, which seriously affects drilling efficiency. Summary of the invention

[0004] The object of the present invention is to provide an axial-torsionally coupled impact screw, a PDC drill bit and a drilling tool to solve at least one of the above problems.

[0005] The above-mentioned purpose of the present invention can be achieved by adopting the following technical solutions:

[0006] The present invention provides an axial-torsion coupling impact screw, comprising a power screw unit, a torsion impact screw unit and an axial impact screw unit connected in sequence on a coaxial line; the power screw unit is used to provide power to the torsion impact screw unit and the axial impact screw unit under the action of a fluid medium; the torsion impact screw unit comprises a torsion impact main shaft with a first flow channel and a torsion impact module and a torsion impact shell which are sequentially sleeved outside the torsion impact main shaft, the first flow channel is used to receive the fluid medium flowing out of the power screw unit, the side wall of the torsion impact main shaft is provided with a wall hole structure for conveying the fluid medium to the torsion impact module, and the torsion impact main shaft is used to convey the power The power provided by the screw unit is transmitted to the axial impact screw unit, and the torsion impact module is used to provide torsional impact force for the axial impact screw unit under the action of the fluid medium; the axial impact screw unit includes an axial impact main shaft with a second flow channel and an axial impact module and an axial impact shell which are sequentially sleeved outside the axial impact main shaft, the second flow channel is used to receive the fluid medium flowing out of the torsion impact screw unit, the axial impact main shaft is connected to the torsion impact main shaft, the axial impact module can perform periodic axial movement following the rotation of the axial impact main shaft, and generate periodic axial impact force on the axial impact main shaft, and the axial impact shell is connected to the torsion impact shell.

[0007] Preferably, the torsion punch module comprises a torsion punch hammer, a torsion punch anvil and a distribution sleeve; along the feeding direction of the axial-torsion coupling impact screw, the torsion punch hammer is circumferentially movably sleeved on the upstream end of the torsion punch main shaft, and part of the side wall of the torsion punch hammer extends axially along the feeding direction of the axial-torsion coupling impact screw to form a plurality of hammer ribs arranged at circumferential intervals; the torsion punch anvil is fixedly sleeved on the downstream end of the torsion punch main shaft and connected to the axial punch housing, and part of the side wall of the torsion punch anvil extends axially in the direction opposite to the feeding direction of the axial-torsion coupling impact screw to form a plurality of hammer ribs arranged at circumferential intervals and of the same length as the plurality of hammer ribs. The invention relates to a plurality of anvil ribs having the same structure; the plurality of anvil ribs and the plurality of hammer ribs are cross-arranged along the circumferential direction of the torsion punch main shaft, and the circumferential length between two adjacent anvil ribs is greater than the circumferential length of the hammer ribs; along the feeding direction of the axial-torsion coupling impact screw, the distribution sleeve is fixedly sleeved at the upstream end of the torsion punch main shaft, and the inner wall of the distribution sleeve is connected with the outer walls of the anvil ribs and the hammer ribs, the distribution sleeve extends axially along the feeding direction of the axial-torsion coupling impact screw to axially connect with the torsion punch anvil, and the distribution sleeve is circumferentially spaced with a plurality of guide grooves extending axially and staggered with the wall hole structure.

[0008] Specifically, the wall hole structure includes multiple rows of side flow channel hole groups arranged axially at intervals, each row of the side flow channel hole groups includes multiple side flow channel holes arranged circumferentially at intervals, each of the side flow channel holes is connected to the first flow channel, and the side flow channel holes and the guide groove are circumferentially staggered; when the torsion punch main shaft rotates until the side flow channel hole is connected to the first gap between the hammer rib and an adjacent anvil rib, the fluid medium enters the first gap through the side flow channel hole and is blocked in the closed cavity formed by the distribution sleeve, the torsion punch hammer and the torsion punch anvil. A high-pressure area is formed inside, and the second gap between the hammer rib and another adjacent anvil rib is connected with the guide groove to form a low-pressure area, and the hammer rib is subjected to force to drive the torsion hammer to rotate from the first gap to the direction of the second gap and hit the anvil rib; when the torsion main shaft rotates to the point where the side flow channel hole is connected with the second gap between the hammer rib and another adjacent anvil rib, under the action of the fluid medium, the hammer rib is subjected to force to drive the torsion hammer to rotate from the second gap to the direction of the first gap and hit the anvil rib.

[0009] Preferably, part of the side wall of the torsion anvil extends axially along the feeding direction of the axial-torsion coupling impact screw to form a plurality of first connecting parts arranged at circumferential intervals, and a first connecting groove is formed between two adjacent first connecting parts. Part of the side wall of the axial impact housing extends axially in the direction opposite to the feeding direction of the axial-torsion coupling impact screw to form a plurality of second connecting parts arranged at circumferential intervals, and a second connecting groove is formed between two adjacent second connecting parts. The first connecting part is cooperatively connected with the second connecting groove, and the first connecting groove is cooperatively connected with the second connecting part.

[0010] Preferably, along the feeding direction of the axial torsion coupling impact screw, a plurality of reflow holes are arranged at intervals at the lower part of the torsion anvil, and the reflow holes are used to guide back the fluid medium flowing out of the torsion spindle.

[0011] Preferably, the shaft punch module includes a disc spring, an impact block, a fixed block and a roller group arranged between the impact block and the fixed block; along the feeding direction of the shaft torsion coupling impact screw, the disc spring is sleeved on the upstream end of the shaft punch main shaft, the impact block is located at the downstream end of the disc spring and sleeved on the shaft punch main shaft, and the inner wall of the shaft punch housing is provided with a matching structure for circumferentially limiting the impact block and a step for axially limiting the disc spring, the fixed block is located at the downstream end of the impact block and is fixedly connected to the shaft punch main shaft through a transmission sleeve, and the end of the impact block close to the fixed block is provided with A first guide rail that repeatedly rises and falls and is circumferentially closed, a second guide rail that cooperates with the first guide rail is arranged at the end of the fixed block near the impact block, a plurality of rollers are accommodated between the first guide rail and the second guide rail, and the plurality of rollers are arranged along a full circle in the circumferential direction to form the roller group; when the shaft punch main shaft rotates, the plurality of rollers continuously roll along the circumferential direction in the channel formed between the first guide rail and the second guide rail, so that the impact block periodically moves axially to compress the disc spring, and the disc spring can follow the impact block to undergo periodic reset and generate periodic axial impact force on the shaft punch main shaft.

[0012] Another object of the present invention is to provide a PDC drill bit, comprising: a drill bit base body, the head of the drill bit base body extending axially to form an impact hammer base body, and a plurality of vibration impact teeth are arranged at intervals on the impact hammer base body; a plurality of cutting blades are arranged at intervals along the circumferential direction of the drill bit base body, and a plurality of cutting teeth are arranged at intervals on each of the cutting blades.

[0013] Preferably, the cutting teeth include conical cutting teeth and planar cutting teeth, and along the drilling direction of the PDC drill bit, the conical cutting teeth, the vibration impact teeth and the planar cutting teeth sequentially contact the same rock formation to be broken.

[0014] Preferably, the conical cutting teeth are arranged on the front working surface side of the cutting wing section where the cutting wing is located on the head wall surface of the drill bit base body, and the planar cutting teeth are arranged on the cutting wing section where the cutting wing is located on the side wall surface of the drill bit base body, and on the rear working surface side of the cutting wing section where the cutting wing is located on the head end wall surface of the drill bit base body.

[0015] The present invention also provides a drilling tool, comprising: the axial torsionally coupled impact screw as described in any one of claims 1 to 6; the PDC drill bit as described in any one of claims 7 to 9; the PDC drill bit is connected to the free end of the axial impact spindle.

[0016] The characteristics and advantages of the present invention are: the axial-torsionally coupled impact screw provided by the present application increases the torque and axial impact force output of the axial-torsionally coupled impact screw by arranging a torsion impact module that can move following the rotation of the torsion impact main shaft and an axial impact module that can move following the rotation of the axial impact main shaft, so that the axial-torsionally coupled impact screw has the beneficial effects of improving the feeding efficiency and widening the applicable working conditions; the PDC drill bit provided by the present application increases the contact area between the PDC drill bit and the formation by designing the impact hammer, combining the cutting blade with the impact hammer, improving the rock breaking efficiency, and enabling the PDC drill bit to adapt to complex drilling conditions such as hard formations, abrasive formations, and difficult-to-drill inhomogeneous formations. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 It is a schematic diagram of the planar structure of the drilling tool provided in an embodiment of the present invention;

[0019] Figure 2 for Figure 1 AA section view;

[0020] Figure 3 An exploded schematic diagram of a torsion punch screw unit provided in an embodiment of the present invention;

[0021] Figure 4 It is a schematic diagram of the planar structure of the torsion punch screw unit provided in an embodiment of the present invention;

[0022] Figure 5 for Figure 4 BB cross-sectional view (schematic diagram of the conduction state between the side channel hole and the first gap in the embodiment of the present invention);

[0023] Figure 6 It is a schematic diagram of the result of the torsion hammer rotating from the first gap to the second gap in an embodiment of the present invention;

[0024] Figure 7 It is a schematic diagram of a transition state in which the torsion hammer rotates from the first gap to the second gap and then rotates from the second gap to the first gap in an embodiment of the present invention;

[0025] Figure 8 Schematic diagram of the conduction state between the side channel hole and the second gap in an embodiment of the present invention;

[0026] Fig. 9It is a schematic diagram of the result of the torsion hammer rotating from the second gap to the first gap in an embodiment of the present invention;

[0027] Fig.10 An exploded schematic diagram of the shaft punch screw unit provided in an embodiment of the present invention;

[0028] Fig.11 A schematic diagram of the three-dimensional structure of a PDC drill bit provided in an embodiment of the present invention;

[0029] Fig.12 It is a schematic diagram of the planar structure of the PDC drill bit provided in an embodiment of the present invention.

[0030] Description of Figure Numbers:

[0031] 10. Shaft-torsion coupling impact screw;

[0032] 11. Power screw unit; 111. Housing; 112. Stator; 113. Rotor; 114. Universal joint shaft assembly; 115. Transmission shaft assembly;

[0033] 12. Torsion punch screw unit; 121. Torsion punch main shaft; 1211. First pin hole; 1212. First octagonal outer sleeve structure; 1213. Side flow channel hole group; 122. Torsion punch module; 1221. Torsion punch hammer; 12211. Hammer rib; 1222. Torsion punch anvil; 12221. Anvil rib; 12222. First connecting part; 12223. First connecting groove; 12224. Reflux hole; 1223. Distribution sleeve; 12231. Guide groove; 12232. First octagonal inner sleeve structure; 123. Torsion punch outer shell;

[0034] 13. Shaft punch screw unit; 131. Shaft punch main shaft; 1311. Second pin hole; 132. Shaft punch module; 1321. Disc spring; 1322. Impact block; 13221. First guide rail; 1323. Fixed block; 13231. Second guide rail; 1324. Roller; 133. Shaft punch housing; 1331. Second connecting part; 1332. Second connecting groove; 134. Transmission sleeve; 135. TC bearing;

[0035] 20. PDC drill bit; 21. drill bit base; 22. impact hammer base; 23. vibration impact tooth; 24. cutting blade; 25. nozzle; 26. conical cutting tooth; 27. plane cutting tooth;

[0036] 100, first gap; 200, second gap. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0038] like Figure 1 to Figure 2 As shown, the present invention provides an axial-torsion coupling impact screw 10, comprising a power screw unit 11, a torsion impact screw unit 12 and an axial impact screw unit 13 connected in sequence by coaxial lines; the power screw unit 11 is used to provide power to the torsion impact screw unit 12 and the axial impact screw unit 13 under the action of a fluid medium; the torsion impact screw unit 12 comprises a torsion impact main shaft 121 having a first flow channel and a torsion impact module 122 and a torsion impact shell 123 which are sequentially sleeved outside the torsion impact main shaft 121, the first flow channel is used to receive the fluid medium flowing out of the power screw unit 11, the side wall of the torsion impact main shaft 121 is provided with a wall hole structure for conveying the fluid medium to the torsion impact module 122, and the torsion impact main shaft 121 is used to transfer the power The power provided by the screw unit 11 is transmitted to the axial impact screw unit 13, and the torsion impact module 122 is used to provide torsional impact force for the axial impact screw unit 13 under the action of the fluid medium; the axial impact screw unit 13 includes an axial impact main shaft 131 with a second flow channel and an axial impact module 132 and an axial impact shell 133 which are sequentially arranged outside the axial impact main shaft 131, and the second flow channel is used to receive the fluid medium flowing out of the torsion impact screw unit 12, the axial impact main shaft 131 is connected to the torsion impact main shaft 121, the axial impact module 132 can perform periodic axial movement following the rotation of the axial impact main shaft 131, and generate periodic axial impact force on the axial impact main shaft 131, and the axial impact shell 133 is connected to the torsion impact shell 123.

[0039] Specifically, Figure 2As shown, the power screw unit 11 adopts a conventional screw unit in the prior art, and is composed of a housing 111, a stator 112, a rotor 113, a universal shaft assembly 114, and a transmission shaft assembly 115. The universal shaft assembly 114 is used to convert the eccentric rotation of the rotor 113 under the action of the fluid into the concentric rotation of the transmission shaft assembly 115, and provide the rotation speed and torque for the lower torsion punch screw unit 12 and the shaft punch screw unit 13. With the different fluid displacement, the rotation speed and torque provided by the power screw unit 11 to the torsion punch screw unit 12 and the shaft punch screw unit 13 are correspondingly different. Since the power screw unit 11 is a conventional screw unit in the prior art, the specific structure is not repeated in this application. The torsion punch main shaft 121 of the torsion punch screw unit 12 is connected to the transmission shaft assembly 115 by a threaded connection to take into account both the connection strength and the transmission efficiency. The fluid entering the axial-torsion coupling impact screw 10 first reaches the first flow channel in the torsion impact main shaft 121 after being driven by the power screw unit 11 to output power. Then, as the torsion impact main shaft 121 rotates, it flows to the torsion impact module 122 through the wall hole structure on the torsion impact main shaft 121. Under the action of the fluid medium, the torsion impact module 122 moves and provides a torsional impact force for the axial impact screw unit 13. After the fluid medium flows out of the torsion impact screw unit 12, it enters the second flow channel of the axial impact main shaft 131, and then flows from the second flow channel to the subsequent components. The power provided by the power screw unit 11 is transmitted to the axial impact main shaft 131 connected thereto through the torsion impact main shaft 121, causing the axial impact main shaft 131 to rotate and drive the axial impact module 132 to follow its movement to perform periodic axial movement, thereby generating periodic axial impact force on the axial impact main shaft 131. In this way, the present application increases the torque and axial impact force output of the axial-torsional coupled impact screw 10 by providing a torsion punch module 122 that can move following the rotation of the torsion punch main shaft 121 and an axial punch module 132 that can move following the rotation of the axial punch main shaft 131, so that the axial-torsional coupled impact screw 10 has the beneficial effects of improving the feeding efficiency and widening the applicable working conditions.

[0040] The housing 111, the axial impact housing 133, and the torsion impact housing 123 are sealed and connected in sequence to prevent the fluid medium from leaking in the circumferential direction, thereby affecting the torque and axial impact force output of the axial-torsion coupling impact screw 10, and further affecting the feeding efficiency and feeding stability of the axial-torsion coupling impact screw 10. Figure 3 and Fig.10As shown, the torsion punch main shaft 121 is provided with a first pin hole 1211, and the shaft punch main shaft 131 is provided with a second pin hole 1311 matched with the first pin hole 1211. The axial extension length of the second pin hole 1311 is greater than that of the first pin hole 1211. The torsion punch main shaft 121 and the shaft punch main shaft 131 are axially matched by key pins arranged in the first pin hole 1211 and the second pin hole 1311 and embedded in the first pin hole 1211, and circumferentially matched by an octagonal sleeve structure. In this way, the smooth transmission of torque and rotational power can be achieved, and the shaft punch main shaft 131 has a certain axial flexibility to cope with complex and changeable feeding environments.

[0041] According to one embodiment of the present invention, Figure 3 and Figure 4 As shown, the torsion module 122 includes a torsion hammer 1221, a torsion anvil 1222 and a distribution sleeve 1223. Along the feeding direction of the axial torsion coupling impact screw 10, the torsion hammer 1221 is circumferentially movably sleeved on the upstream end of the torsion main shaft 121, and part of the side wall of the torsion hammer 1221 extends axially along the feeding direction of the axial torsion coupling impact screw 10 to form a plurality of hammer ribs 12211 arranged at intervals in the circumferential direction; the torsion anvil 1222 is fixedly sleeved on the downstream end of the torsion main shaft 121 and connected to the axial impact housing 133, and part of the side wall of the torsion anvil 1222 extends axially in the direction opposite to the feeding direction of the axial torsion coupling impact screw 10 to form a plurality of anvil ribs 12221 arranged at intervals in the circumferential direction and having the same length as the plurality of hammer ribs 12211; the plurality of anvil ribs 12221 and the plurality of hammer ribs 12211 are arranged at intervals in the circumferential direction of the torsion main shaft 121. They are cross-arranged, and the circumferential length between two adjacent anvil ribs 12221 is greater than the circumferential length of the hammer rib 12211, so that there is a gap space between the hammer rib 12211 and the anvil rib 12221 for the fluid medium flowing out of the first flow channel to flow in; along the feeding direction of the axial-torsion coupling impact screw 10, the distribution sleeve 1223 is fixedly sleeved on the upstream end of the torsion punch main shaft 121, and the inner wall of the distribution sleeve 1223 is connected to the outer walls of the anvil rib 12221 and the hammer rib 12211, the distribution sleeve 1223 extends axially along the feeding direction of the axial-torsion coupling impact screw 10 to axially connect with the torsion punch anvil 1222, and the distribution sleeve 1223 is circumferentially spaced with a plurality of guide grooves 12231 extending axially and staggered with the wall hole structure.

[0042] Specifically, Figure 3As shown, a first octagonal outer sleeve structure 1212 is formed on the outer wall of the torsion punch main shaft 121, and a first octagonal inner sleeve structure 12232 matched with the first octagonal outer sleeve structure 1212 is formed on the inner wall of the distribution sleeve 1223. The torsion punch main shaft 121 and the distribution sleeve 1223 are fixedly connected by the mutually matched octagonal sleeve structures to maintain a high degree of coaxiality and stability between the two, so as to achieve uninterrupted, low-wear continuous rotation power transmission. Under the power output of the power screw unit 11, the distribution sleeve 1223 rotates synchronously with the torsion punch main shaft 121. As the rotation proceeds, the fluid medium in the first flow channel enters the gap space between one side wall of the hammer rib 12211 and the adjacent anvil rib 12221 through the wall hole structure on the torsion punch main shaft 121, and is blocked in the gap space by the external distribution sleeve 1223, forming a high-pressure area; at the same time, the other side wall of the hammer rib 12211 that is not in contact with the fluid medium and the gap between the adjacent anvil rib 12221 No fluid medium flows into the gap space between the two ends, and the gap space is connected to the guide groove 12231 on the distribution sleeve 1223 and is in a low-pressure area. Under the action of the high and low pressure difference on both sides, the hammer rib 12211 rotates in the direction of the low-pressure area and hits the adjacent anvil rib 12221, generating a button-shaped impact force on the anvil rib 12221, and is transmitted to the torsion punch main shaft 121 and the shaft punch housing 133 connected to the torsion punch anvil 1222 through the anvil rib 12221, and finally transmitted to the entire shaft-torsion coupling impact screw 10. As the synchronous rotation of the distribution sleeve 1223 and the torsion impulse main shaft 121 continues, the guide groove 12231 on the distribution sleeve 1223 is connected to the gap space between one side wall of the hammer rib 12211 and the adjacent anvil rib 12221, and the fluid medium flows out to form a low-pressure area; at the same time, the fluid medium in the first flow channel enters the gap space between the other side wall of the hammer rib 12211 and the adjacent anvil rib 12221 through the wall hole structure on the torsion impulse main shaft 121, and is blocked in the gap space by the external distribution sleeve 1223 to form a high-pressure area. Under the action of the high and low pressure difference on both sides, the hammer rib 12211 rotates in the direction of the low-pressure area and hits the adjacent anvil rib 12221, generating a button-shaped impact force on the anvil rib 12221, and finally transmitting it to the entire axial-torsion coupled impact screw 10. That is, as the distribution sleeve 1223 and the torsion impact main shaft 121 continue to rotate synchronously, the hammer rib 12211 between the two adjacent anvil ribs 12221 rotates back and forth and hits the two adjacent anvil ribs 12221 in turn, generating a torsional impact force of a certain frequency and a certain magnitude on the torsion impact anvil 1222, and finally transmitting it to the entire axial-torsion coupling impact screw 10, thereby increasing the torque output of the axial-torsion coupling impact screw 10.It should be noted that the torsion hammer 1221 and the torsion anvil 1222 cooperate to form a cross-limiting structure through multiple hammer ribs 12211 and multiple anvil ribs 12221 with opposite extension directions and the same extension length, which not only enhances the stability of the matching structure between the torsion hammer 1221 and the torsion anvil 1222, but also limits the flow path of the fluid medium, so that each hammer rib 12211 on the torsion hammer 1221 can achieve efficient and precise reciprocating impact action, effectively acting on the torsion anvil 1222, so that the axial-torsion coupled impact screw 10 can generate additional torsional impact force, thereby improving the adaptability to complex feeding environments and feeding efficiency.

[0043] According to one embodiment of the present invention, Figure 3 As shown, the wall hole structure includes multiple rows of side flow channel hole groups 1213 arranged at intervals in the axial direction, and each row of side flow channel hole groups 1213 includes multiple side flow channel holes arranged at intervals in the circumferential direction. Figures 5 to 9 As shown, each side flow channel hole is connected to the first flow channel, and the side flow channel holes and the guide groove 12231 are circumferentially staggered. Figures 5 to 9 The dark arrow in the figure indicates the rotation direction of the torsion punch main shaft 121, and the light arrow in the figure indicates the movement direction of the torsion punch hammer 1221. Figure 5 and Figure 6 As shown, when the torsion punch main shaft 121 rotates to the side channel hole and the first gap 100 between the hammer rib 12211 and an adjacent anvil rib 12221 is connected, the fluid medium enters the first gap 100 through the side channel hole and is blocked in the closed cavity formed by the distribution sleeve 1223, the torsion punch hammer 1221 and the torsion punch anvil 1222 to form a high-pressure area, and the second gap 200 between the hammer rib 12211 and another adjacent anvil rib 12221 is connected to the guide groove 12231 to form a low-pressure area, and the hammer rib 12211 is driven by force to drive the torsion punch hammer 1221 to rotate from the first gap 100 to the second gap 200 and hit the anvil rib 12221. Figure 8 and Fig. 9 As shown, when the torsion punch main shaft 121 rotates to the point where the side channel hole is connected to the second gap 200 between the hammer rib 12211 and another adjacent anvil rib 12221, under the action of the fluid medium, the hammer rib 12211 is forced to drive the torsion punch hammer 1221 to rotate from the second gap 200 to the direction of the first gap 100 and hit the anvil rib 12221.

[0044] Specifically, Figures 5 to 9As shown, the side channel hole connected to the first channel is circumferentially staggered with the guide groove 12231. In this way, during the synchronous rotation of the distribution sleeve 1223 and the torsion punch main shaft 121, the side channel hole is never connected to the guide groove 12231, and the fluid medium enters the gap space between the hammer rib 12211 and the anvil rib 12221 from the side channel hole and is blocked by the distribution sleeve 1223, so that the gap space forms a high-pressure area, and the gap space between the hammer rib 12211 and the anvil rib 12221 that is not connected to the side channel hole is opened by the distribution sleeve 1223 and is in a low-pressure area, which is convenient for each hammer rib 12211 to achieve efficient and accurate reciprocating impact action. Preferably, the length of the torsion punch main shaft 121 and the number of the side channel hole groups 1213 can be adjusted to increase the flow rate of the fluid medium, thereby increasing the fluid energy and generating a greater torsional impact force. Preferably, the flow rate of the fluid medium entering the power screw unit 11 can be adjusted to control the rotation speed of the torsion impact spindle 121, thereby controlling the frequency of generating the torsion impact force. In this embodiment, in order to simplify the formation of the high and low pressure areas on both sides of the hammer rib 12211, each row of the side channel hole group 1213 only includes two side channel holes uniformly distributed in the circumferential direction.

[0045] According to one embodiment of the present invention, Figure 3 and Fig.10 As shown, part of the side wall of the torsion anvil 1222 extends axially along the feeding direction of the axial-torsion coupling impact screw 10 to form a plurality of first connecting parts 12222 arranged at circumferential intervals, and a first connecting groove 12223 is formed between two adjacent first connecting parts 12222. Part of the side wall of the axial impact housing 133 extends axially in the direction opposite to the feeding direction of the axial-torsion coupling impact screw 10 to form a plurality of second connecting parts 1331 arranged at circumferential intervals, and a second connecting groove 1332 is formed between two adjacent second connecting parts 1331. The first connecting part 12222 is cooperatively connected with the second connecting groove 1332, and the first connecting groove 12223 is cooperatively connected with the second connecting part 1331.

[0046] Specifically, Figure 3 and Fig.10 As shown, the torsion anvil 1222 and the shaft impact shell 133 form a keyway matching structure in which the first connection part 12222 and the second connection part 1331 are matched and connected at the joint, and the first connection groove 12223 and the second connection part 1331 are matched and connected, respectively, through the first connection part 12222 and the second connection part 1331 extending in opposite directions at the joint, thereby ensuring that the torsional impact force generated during the torsion punching process can be smoothly and efficiently transmitted to the entire shaft-torsion coupling impact screw 10 through the shaft impact shell 133, thereby enhancing the overall feeding efficiency of the shaft-torsion coupling impact screw 10.

[0047] According to one embodiment of the present invention, Figure 3 and Figure 4As shown, along the feeding direction of the axial-torsionally coupled impact screw 10, a plurality of reflow holes 12224 are arranged at intervals at the lower portion of the torsion anvil 1222. The reflow holes 12224 are used to guide the fluid medium flowing out of the torsion spindle 121 back so that the fluid medium flows into the first flow channel again and quickly flows to the second flow channel and subsequent components through the first flow channel.

[0048] According to one embodiment of the present invention, Fig.10 As shown, the shaft punch module 132 includes a disc spring 1321, an impact block 1322, a fixed block 1323 and a roller 1324 group arranged between the impact block 1322 and the fixed block 1323; along the feeding direction of the shaft-torsion coupling impact screw 10, the disc spring 1321 is sleeved on the upstream end of the shaft punch main shaft 131, the impact block 1322 is located at the downstream end of the disc spring 1321 and is sleeved on the shaft punch main shaft 131, and the inner wall of the shaft punch housing 133 is provided with a matching structure for circumferentially limiting the impact block 1322 and a step for axially limiting the disc spring 1321, the fixed block 1323 is located at the downstream end of the impact block 1322 and is fixedly connected to the shaft punch main shaft 131 through a transmission sleeve 134, and the end of the impact block 1322 close to the fixed block 1323 is provided with a repeating A first guide rail 13221 is undulating and circumferentially closed, and a second guide rail 13231 is provided at the end of the fixed block 1323 near the impact block 1322 to cooperate with the first guide rail 13221. A plurality of rollers 1324 are accommodated between the first guide rail 13221 and the second guide rail 13231, and the plurality of rollers 1324 are arranged along a full circle in the circumferential direction to form a roller 1324 group; when the shaft punch main shaft 131 rotates, the plurality of rollers 1324 continuously roll in the channel formed between the first guide rail 13221 and the second guide rail 13231 along the circumferential direction, so that the impact block 1322 periodically moves in the axial direction to compress the disc spring 1321, and the disc spring 1321 can follow the impact block 1322 to undergo periodic reset and generate periodic axial impact force on the shaft punch main shaft 131.

[0049] Specifically, along the feeding direction of the axial torsion coupling impact screw 10, the disc spring 1321 is sleeved on the shaft punch main shaft 131 between the step of the shaft punch housing 133 and the impact block 1322, and the upper end of the disc spring 1321 is closely fitted with the step of the shaft punch housing 133, and the lower end of the disc spring 1321 is closely fitted with the impact block 1322. By sleeved on the shaft punch main shaft 131, the disc spring 1321 is prevented from lateral movement under force, and the two ends of the disc spring 1321 are closely fitted with the step of the shaft punch housing 133 and the impact block 1322, respectively, so that the disc spring 1321 can quickly enter a compressed state after being axially compressed, and accumulate a large amount of energy. Under the power output of the power screw unit 11, the axial punch main shaft 131 and the torsion punch main shaft 121 rotate synchronously, and the fixed block 1323 fixedly connected to the axial punch main shaft 131 through the transmission sleeve 134 rotates synchronously with the axial punch main shaft 131, so that the rollers 1324 arranged in a whole circle roll continuously in the channel formed between the first guide rail 13221 and the second guide rail 13231. When passing through the first guide rail 13221 with repeated ups and downs at the upper end of the channel and closed in the circumferential direction, the first guide rail 13221 and the second guide rail 13231 are connected. A periodic height difference occurs between the impact block 1322 and the impact block 1322, so that the impact block 1322 performs periodic reciprocating motion along the axial direction. With the periodic reciprocating motion of the impact block 1322, the disc spring 1321 periodically switches between the compressed energy storage state and the reset energy release state, thereby generating a periodic axial impact force on the impact block 1322, and transmitting it to the shaft-punch main shaft 131 through the roller 1324 and the fixed block 1323, thereby increasing the axial impact force of the shaft-torsion coupling impact screw 10, and further increasing the feeding efficiency of the shaft-torsion coupling impact screw 10. In order to avoid the lateral vibration and wear caused by the relative rotation between the shaft-punch main shaft 131 and the shaft-punch housing 133, a TC bearing 135 is arranged between the transmission sleeve 134 and the shaft-punch housing 133 to reduce the friction between the shaft-punch main shaft 131 and the shaft-punch housing 133, and to ensure the coaxial rotation of the shaft-punch main shaft 131 relative to the shaft-punch housing 133. Preferably, the magnitude of the axial impact force can be changed by adaptively adjusting the number of sets of disc springs 1321 or the performance parameters of disc springs 1321 or the periodic height difference between the matching first guide rails 13221 and the second guide rails 13231; the axial impact frequency can be changed by changing the rotation speed of the axial punch spindle 131 and the number of repetitions of the high and low undulating structures matching the first guide rails 13221 and the second guide rails 13231 to cope with different requirements of the feeding environment for the axial impact force.

[0050] like Fig.11 and Fig.12As shown, another object of the present invention is to provide a PDC drill bit 20, comprising: a drill bit base 21, the head of the drill bit base 21 extends axially to form an impact hammer base 22, and a plurality of vibration impact teeth 23 are arranged at intervals on the impact hammer base 22; a plurality of cutting blades 24 are arranged at intervals along the circumferential direction of the drill bit base 21, and a plurality of cutting teeth are arranged at intervals on each cutting blade 24.

[0051] Specifically, Fig.11 As shown, the drill bit base 21 and the impact hammer base 22 constitute the main body of the PDC drill bit 20, and a plurality of vibration impact teeth 23 are arranged at intervals on the impact hammer base 22 to form an impact hammer, and a plurality of cutting blades 24 with a plurality of cutting teeth arranged thereon are arranged at intervals along the circumferential direction on the drill bit base 21. By designing the impact hammer, the cutting blades 24 are combined with the impact hammer to increase the contact area between the PDC drill bit 20 and the formation, improve the rock breaking efficiency, and enable the PDC drill bit 20 to adapt to complex drilling conditions such as hard formations, abrasive formations, and difficult-to-drill heterogeneous formations. Among them, a nozzle 25 connected to the internal flow channel is provided on the drill bit base 21 between two adjacent cutting blades 24, so that during the drilling process of the PDC drill bit 20, a fluid medium such as drilling fluid is sprayed through the nozzle 25 to ensure the cleaning, cuttings back discharge and cooling effects of the PDC drill bit 20. Preferably, the nozzle 25 is an elongated straight cone nozzle 25 with a large flow coefficient, a contraction angle of 28°, and an aspect ratio of 5 / 6 to improve the performance of the nozzle 25. In this embodiment, the nozzle 25 partially penetrates the impact hammer base 22 to form a cuttings flow channel.

[0052] Preferably, the drill bit base 21, the impact hammer base 22 and the cutting blade 24 are integrally processed and formed by a five-axis machining center, and the nozzle 25, the vibration impact tooth 23 and the cutting tooth are precisely positioned by numerical control. The nozzle 25 is connected to the drill bit base 21 by welding, the cutting tooth is connected to the cutting blade 24 by welding, and the vibration impact tooth 23 is connected to the impact hammer base 22 by welding. Preferably, the vibration impact tooth 23 adopts a conical tooth shape, which has the effects of smaller interaction force, greater penetration depth, high impact energy transmission efficiency, and severe pressure loss under the tooth under the action of vibration impact. In order to further improve the performance of the vibration impact tooth 23, the axial inclination angle of the vibration impact tooth 23 is 0°, the cone top radius of the vibration impact tooth 23 is 2mm, and the cone top angle is 90°. Preferably, the cutting blade 24 adopts a straight blade structure, and the crown section angle of the cutting blade 24 is preferably 170°, so as to enhance the attack performance of the PDC drill bit 20 and the cleaning effect of the nozzle 25 on the PDC drill bit 20. Furthermore, the crown of the cutting blade 24 adopts a short-section structure to increase the space of the impact hammer base 22 and enhance the impact ability of the nose shoulder of the cutting blade 24. Preferably, in order to balance the force of the PDC drill bit 20 during drilling, multiple cutting blades 24 are evenly arranged along the circumferential direction of the drill bit base 21. In this embodiment, five cutting blades 24 are evenly distributed on the drill bit base 21 along the circumferential direction, and the impact hammer base 22 is arranged at the center surrounded by the crowns of the five cutting blades 24. Preferably, in order to obtain better drilling efficiency, the ratio of the diameter of the impact hammer base 22 to the diameter of the drill bit base 21 is 0.45. Preferably, in order to enable the impact hammer to play a full-range and wide-area cutting role on the basis of realizing the vibration impact role, the vibration impact teeth 23 are spirally distributed on the impact hammer base 22 along the circumferential direction. Similarly, the cutting blades 24 can also be spirally distributed on the drill bit base 21 to further improve the full-range and wide-area cutting role of the PDC drill bit 20.

[0053] According to one embodiment of the present invention, Fig.11 and Fig.12 As shown, the cutting teeth include conical cutting teeth 26 and planar cutting teeth 27. Along the drilling direction of the PDC drill bit 20, the conical cutting teeth 26, the vibration impact teeth 23 and the planar cutting teeth 27 contact the same rock formation to be broken in sequence, that is, at the head of the PDC drill bit 20, the cutting height of the conical cutting teeth 26 is the largest, the cutting height of the vibration impact teeth 23 is the second, and the cutting height of the planar cutting teeth 27 is the smallest. In this way, when the PDC drill bit 20 is used for rock breaking drilling, the conical cutting teeth 26 pre-crush and damage the rock in the form of plowing, and then the vibration impact teeth 23 further impact and damage the hard rock, so that the planar cutting teeth 27 as the main cutting teeth are easier to invade and crush the rock, and the cooperation of the conical cutting teeth 26, the vibration impact teeth 23 and the planar cutting teeth 27 can achieve efficient crushing of hard rock, improve the drilling speed of deep hard rock formations, and reduce drilling costs.

[0054] According to one embodiment of the present invention, the conical cutting teeth 26 are arranged on the front working surface side of the cutting wing section of the cutting wing 24 located on the head wall surface of the drill bit base 21, and the planar cutting teeth 27 are arranged on the cutting wing section of the cutting wing 24 located on the side wall surface of the drill bit base 21, and the cutting wing 24 is located on the rear working surface side of the cutting wing section of the head end wall surface of the drill bit base 21.

[0055] Specifically, Fig.11 and Fig.12 As shown, along the rotation direction of the PDC drill bit 20, each cutting wing 24 is sequentially provided with a mixed cutting tooth row and a plane cutting tooth 27 row, that is, a mixed cutting tooth row is provided on the front working surface side of each cutting wing 24, and a plane cutting tooth 27 row is provided on the rear working surface side of each cutting wing 24. The mixed cutting tooth row and the plane cutting tooth 27 row constitute a double-row tooth structure on the cutting wing 24. The mixed cutting tooth row includes conical cutting teeth 26 arranged on the front working surface of the cutting wing 24 and located on the head wall surface of the drill bit base 21, and planar cutting teeth 27 arranged on the front working surface of the cutting wing 24 and located on the side wall surface of the drill bit base 21. The planar cutting tooth 27 row includes planar cutting teeth 27 arranged on the rear working surface of the cutting wing 24, that is, the conical cutting teeth 26 are only arranged on the front working surface side of the cutting wing section of the cutting wing 24 located on the head wall surface of the drill bit base 21, and the planar cutting teeth 27 are arranged on the cutting wing section (including the front working surface and the rear working surface) of the cutting wing 24 located on the side wall surface of the drill bit base 21, and on the rear working surface side of the cutting wing section of the cutting wing 24 located on the head end wall surface of the drill bit base 21. In this way, by using the mixed tooth arrangement characteristics of the conical cutting teeth 26 and the flat cutting teeth 27 on the cutting blade 24, the purpose of reducing the stick-slip effect of the PDC drill bit 20 is achieved while achieving efficient hard rock crushing.

[0056] like Figure 1 and Figure 2 As shown, the present invention further provides a drilling tool, comprising: the axial torsionally coupled impact screw 10 as described above; the PDC drill bit 20 as described above; the PDC drill bit 20 is connected to the free end of the axial impact spindle 131.

[0057] Specifically, Figure 2As shown, the axial-torsion coupling impact screw 10 and the PDC drill bit 20 are connected and cooperated to form a drilling tool, and its working principle is: the power screw unit 11 provides the rotation speed and torque to the torsion impact spindle 121 and the axial impact spindle 131 under the action of the fluid medium (drilling fluid), and with the rotation of the torsion impact spindle 121, the torsion impact module 122 reciprocates to convert the hydraulic energy of the fluid medium (drilling fluid) into mechanical energy, and provides the PDC drill bit 20 as the end actuator with an additional torsional impact force with a certain frequency and a certain torque, and with the rotation of the axial impact spindle 131, the axial impact module 132 periodically acts to convert the elastic potential energy The PDC drill bit 20 is a very powerful drill that can penetrate deep into the rock and break the rock quickly. The PDC drill bit 20 is a very powerful drill that can penetrate deep into the rock and break the rock quickly. The PDC drill bit 20 is a very powerful drill that can penetrate deep into the rock and break the rock quickly.

[0058] Based on the above structural description, the axial-torsion coupling impact screw 10 provided in the embodiment of the present application increases the torque and axial impact force output of the axial-torsion coupling impact screw 10 by setting a torsion punch module 122 that can reciprocate following the rotation of the torsion punch main shaft 121 and an axial punch module 132 that can periodically move following the rotation of the axial punch main shaft 131, so that the axial-torsion coupling impact screw 10 has the beneficial effects of improving the feeding efficiency and widening the applicable working conditions; the PDC drill bit 20 provided in the embodiment of the present application is designed with an impact hammer to make the cutting tool The wing 24 is combined with the impact hammer to increase the contact area between the PDC drill bit 20 and the formation, improve the rock breaking efficiency, and enable the PDC drill bit 20 to adapt to complex drilling conditions such as hard formations, abrasive formations, and difficult-to-drill inhomogeneous formations; the drilling tool provided in the embodiment of the present application connects and cooperates the axial-torsionally coupled impact screw 10 and the PDC drill bit 20, so that the PDC drill bit 20 has the beneficial effects of efficiently breaking hard rock, improving the drilling speed of deep hard rock formations, and reducing drilling costs under the coupling action of axial impact force and torsional impact force.

[0059] The above are only several embodiments of the present invention. Those skilled in the art may make various changes or modifications to the embodiments of the present invention based on the contents disclosed in the application documents without departing from the spirit and scope of the present invention.

Claims

1. A shaft-torsion coupling impact screw, characterized in that: It includes a power screw unit, a torsion screw unit and an axial screw unit which are connected in sequence with a coaxial line; The power screw unit is used to provide power to the torsion impact screw unit and the axial impact screw unit under the action of a fluid medium; The torsion punch screw unit comprises a torsion punch main shaft having a first flow channel, a torsion punch module and a torsion punch housing which are sequentially sleeved outside the torsion punch main shaft, the first flow channel is used to receive the fluid medium flowing out of the power screw unit, the side wall of the torsion punch main shaft is provided with a wall hole structure for conveying the fluid medium to the torsion punch module, the torsion punch main shaft is used to transmit the power provided by the power screw unit to the axial punch screw unit, and the torsion punch module is used to provide a torsional impact force for the axial punch screw unit under the action of the fluid medium; The axial impact screw unit includes an axial impact main shaft with a second flow channel, and an axial impact module and an axial impact shell which are sequentially sleeved on the axial impact main shaft. The second flow channel is used to receive the fluid medium flowing out of the torsion impact screw unit. The axial impact main shaft is connected to the torsion impact main shaft. The axial impact module can perform periodic axial movement following the rotation of the axial impact main shaft and generate periodic axial impact force on the axial impact main shaft. The axial impact shell is connected to the torsion impact shell.

2. The axial-torsionally coupled impact screw according to claim 1, characterized in that: The torsion impact module includes a torsion impact hammer, a torsion impact anvil and a flow distribution sleeve; Along the feeding direction of the axial torsion coupling impact screw, the torsion punch hammer is circumferentially movably sleeved on the upstream end of the torsion punch main shaft, and part of the side wall of the torsion punch hammer is axially extended along the feeding direction of the axial torsion coupling impact screw to form a plurality of hammer ribs arranged at intervals in the circumferential direction; the torsion punch anvil is fixedly sleeved on the downstream end of the torsion punch main shaft and is connected to the axial punch housing, and part of the side wall of the torsion punch anvil is axially extended in the direction opposite to the feeding direction of the axial torsion coupling impact screw to form a plurality of anvil ribs arranged at intervals in the circumferential direction and having the same length as the plurality of hammer ribs; the plurality of anvil ribs and the plurality of hammer ribs are cross-arranged along the circumferential direction of the torsion punch main shaft, and the circumferential length between two adjacent anvil ribs is greater than the circumferential length of the hammer ribs; Along the feeding direction of the axial-torsionally coupled impact screw, the distribution sleeve is fixedly arranged at the upstream end of the torsion punch main shaft, and the inner wall of the distribution sleeve is connected to the outer walls of the anvil rib and the hammer rib, and the distribution sleeve extends axially along the feeding direction of the axial-torsionally coupled impact screw to axially connect with the torsion punch anvil, and the distribution sleeve is circumferentially spaced with a plurality of guide grooves extending axially and staggered with the wall hole structure.

3. The axial-torsionally coupled impact screw according to claim 2, characterized in that: The wall hole structure comprises a plurality of rows of side flow channel hole groups arranged at intervals in the axial direction, each row of the side flow channel hole groups comprises a plurality of side flow channel holes arranged at intervals in the circumferential direction, each of the side flow channel holes is connected to the first flow channel, and the side flow channel holes are arranged circumferentially staggered from the guide groove; When the torsion punch main shaft rotates until the side flow channel hole is connected with the first gap between the hammer rib and an adjacent anvil rib, the fluid medium enters the first gap through the side flow channel hole and is blocked in the closed cavity formed by the distribution sleeve, the torsion punch hammer and the torsion punch anvil to form a high-pressure area, and the second gap between the hammer rib and another adjacent anvil rib is connected with the guide groove to form a low-pressure area, and the hammer rib is driven by force to drive the torsion punch hammer to rotate from the first gap to the direction of the second gap and hit the anvil rib; when the torsion punch main shaft rotates until the side flow channel hole is connected with the second gap between the hammer rib and another adjacent anvil rib, under the action of the fluid medium, the hammer rib is driven by force to drive the torsion punch hammer to rotate from the second gap to the direction of the first gap and hit the anvil rib.

4. The axial-torsionally coupled impact screw according to claim 3, characterized in that: Part of the side wall of the torsion anvil extends axially along the feeding direction of the axial-torsion coupling impact screw to form a plurality of first connecting parts arranged at circumferential intervals, and a first connecting groove is formed between two adjacent first connecting parts. Part of the side wall of the axial impact shell extends axially along the direction opposite to the feeding direction of the axial-torsion coupling impact screw to form a plurality of second connecting parts arranged at circumferential intervals, and a second connecting groove is formed between two adjacent second connecting parts. The first connecting part is cooperatively connected with the second connecting groove, and the first connecting groove is cooperatively connected with the second connecting part.

5. The axial-torsionally coupled impact screw according to claim 4, characterized in that: Along the feeding direction of the axial torsion coupling impact screw, a plurality of reflow holes are arranged at intervals at the lower part of the torsion anvil, and the reflow holes are used to guide back the fluid medium flowing out of the torsion spindle.

6. The axial-torsionally coupled impact screw according to claim 5, characterized in that: The shaft impact module includes a disc spring, an impact block, a fixed block and a roller group arranged between the impact block and the fixed block; Along the feeding direction of the axial torsion coupling impact screw, the disc spring is sleeved on the upstream end of the shaft punch main shaft, the impact block is located at the downstream end of the disc spring and sleeved on the shaft punch main shaft, and the inner wall of the shaft punch housing is provided with a matching structure for circumferentially limiting the impact block and a step for axially limiting the disc spring, the fixed block is located at the downstream end of the impact block and is fixedly connected to the shaft punch main shaft through a transmission sleeve, the end of the impact block close to the fixed block is provided with a first guide rail that repeatedly rises and falls and is circumferentially closed, the end of the fixed block close to the impact block is provided with a second guide rail that matches the first guide rail, a plurality of rollers are accommodated between the first guide rail and the second guide rail, and the plurality of rollers are arranged along a full circle in the circumferential direction to form the roller group; When the shaft punch spindle rotates, the plurality of rollers continuously roll in the channel formed between the first guide rail and the second guide rail along the circumferential direction, so that the impact block periodically moves axially to compress the disc spring. The disc spring can follow the impact block to undergo periodic reset and generate periodic axial impact force on the shaft punch spindle.

7. A PDC drill bit, characterized in that: include: A drill bit base body, the head of the drill bit base body axially extends to form an impact hammer base body, and a plurality of vibration impact teeth are arranged at intervals on the impact hammer base body; A plurality of cutting blades are arranged at intervals along the circumferential direction of the drill base, and a plurality of cutting teeth are arranged at intervals on each of the cutting blades.

8. The PDC drill bit according to claim 7, characterized in that: The cutting teeth include conical cutting teeth and planar cutting teeth. Along the drilling direction of the PDC drill bit, the conical cutting teeth, the vibration impact teeth and the planar cutting teeth are in contact with the same rock formation to be broken in sequence.

9. The PDC drill bit according to claim 8, characterized in that: The conical cutting teeth are arranged on the front working surface side of the blade section of the cutting blade located on the head wall surface of the drill bit base body, and the planar cutting teeth are arranged on the blade section of the cutting blade located on the side wall surface of the drill bit base body, and on the rear working surface side of the blade section of the cutting blade located on the head end wall surface of the drill bit base body.

10. A drilling tool, characterized in that: include: The axial-torsionally coupled impact screw according to any one of claims 1 to 6; The PDC drill bit according to any one of claims 7 to 9; The PDC drill bit is connected to the free end of the punch spindle.

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