Axial-torsional coupling impact screw, PDC bit and drilling tool

Abstract

The present invention discloses a shaft-torsion coupled impact screw, a PDC bit and a drilling tool. The drilling tool includes a shaft-torsion coupled impact screw and a PDC bit connected to each other. Among them, the shaft-torsion coupled impact screw includes: a power screw unit for providing power under the action of a fluid medium; a torsional impact screw unit connected to the output end of the power screw unit for providing torsional impact force; an axial impact screw unit connected to the output end of the torsional impact screw unit for providing axial impact force; and so on. Among them, the PDC bit includes: a bit matrix, the head of which axially extends to form an impact hammer matrix, and a plurality of vibration impact teeth are arranged at intervals on the impact hammer matrix; a plurality of cutting wings are arranged at intervals along the circumferential direction of the bit matrix, and a plurality of cutting teeth are arranged at intervals on each cutting wing. The drilling tool of the present application combines a shaft-torsion coupled impact screw and a PDC bit, and has the advantages of large output of torque and axial impact force and fast drilling speed in hard rock formations.

Description

Technical Field

[0001] The present invention relates to the technical field of improving the drilling speed in oil drilling, and particularly relates to a shaft-torsion coupling impact screw drill, a PDC bit and a drilling tool. Background Art

[0002] With the continuous increase in exploration and development efforts, moving into the deep earth and developing deep and ultra-deep oil and gas as well as geothermal resources is of great significance for 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 great difficulty in achieving efficient well completion. Therefore, improving rock-breaking efficiency has always been the difficulty and focus of research.

[0003] Currently, during deep and ultra-deep drilling, phenomena such as drill pipe bending and sticking and bit sticking often occur, seriously affecting the drilling cycle. To solve this problem, various impact tools have emerged in the market, such as rotary impact tools, torque impactors, and composite impactors. The power sources of such tools mostly come from hydraulic reversing mechanisms, and they often have the characteristics of insufficient power and unstable operation. As the most commonly used downhole power drill in oil drilling, positive displacement motor has the characteristics of stable working efficiency and high service life. By combining the impact tool with the positive displacement motor, the problems of low efficiency and instability of the impact tool can be solved, giving full play to the advantages of the impact tool and improving the drilling efficiency. However, with the increase in impact load, it poses a major challenge to the working life of the lower PDC bit. Under impact load, conventional PDC bits often suffer from damage, destruction, and even cracking, seriously affecting the drilling efficiency. Summary of the Invention

[0004] The purpose of the present invention is to provide a shaft-torsion coupling impact screw drill, a PDC bit and a drilling tool, which can at least solve one of the above problems.

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

[0006] The present invention provides an axial-torsion coupled impact screw, comprising a power screw unit, a torsion punch screw unit and an axial punch screw unit connected in sequence along a coaxial line; the power screw unit is used to provide power to the torsion punch screw unit and the axial punch screw unit under the action of a fluid medium; the torsion punch screw unit comprises a torsion punch main shaft with a first flow channel and a torsion punch module and a torsion punch shell which are sequentially sleeved on 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, and the torsion punch main shaft is used to transfer 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 to 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 arranged 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 includes 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 circumferentially spaced arrangement and the same length as the plurality of hammer ribs. The present invention relates to a plurality of anvil ribs having the same structure as the torsion punch main shaft; 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 wall of the anvil rib and the hammer rib, 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 communicated with the first flow channel, and the side flow channel holes are circumferentially offset from the diversion groove. When the torsional impact main shaft rotates to a position where the side flow channel hole is communicated 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 sealed in the closed cavity formed by the flow distribution sleeve, the torsional impact hammer and the torsional impact anvil to form a high-pressure area. And the second gap between the hammer rib and another adjacent anvil rib is communicated with the diversion groove to form a low-pressure area. The hammer rib is forced to drive the torsional impact hammer to rotate from the first gap towards the second gap and impact on the anvil rib. When the torsional impact main shaft rotates to a position where the side flow channel hole is communicated with the second gap between the hammer rib and another adjacent anvil rib, under the action of the fluid medium, the hammer rib is forced to drive the torsional impact hammer to rotate from the second gap towards the first gap and impact on the anvil rib.

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

[0010] Preferably, along the feeding direction of the shaft-torsion coupling impact screw, multiple return holes are arranged at intervals at the lower part of the torsional impact anvil. The return holes are used to lead back the fluid medium flowing out of the torsional impact main shaft.

[0011] Preferably, the axial impact module includes a disc spring, an impact block, a fixed block, and a roller group disposed 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 axial impact main shaft, the impact block is located at the downstream end of the disc spring and sleeved on the axial impact main shaft, and the inner wall of the axial impact 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 fixedly connected to the axial impact main shaft through a transmission sleeve. The end of the impact block close to the fixed block is provided with a first guide rail with repeated high and low undulations and circumferentially closed. The end of the fixed block close to the impact block is provided with a second guide rail matching with 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 in a circumferential whole circle to form the roller group. When the axial impact main shaft rotates, the plurality of rollers continuously roll in the channel formed between the first guide rail and the second guide rail in the circumferential direction, so that the impact block moves axially periodically to compress the disc spring. The disc spring can follow the impact block to perform periodic reset and generate a periodic axial impact force on the axial impact main shaft.

[0012] Another object of the present invention is to provide a PDC bit, including: a bit matrix, the head of the bit matrix axially extends to form an impact hammer matrix, and a plurality of vibration impact teeth are arranged at intervals on the impact hammer matrix; a plurality of cutting wings are arranged at intervals along the circumferential direction of the bit matrix, and a plurality of cutting teeth are arranged at intervals on each cutting wing.

[0013] Preferably, the cutting teeth include conical cutting teeth and flat cutting teeth. Along the drilling direction of the PDC bit, the conical cutting teeth, the vibration impact teeth, and the flat 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 wing segment of the cutting wing located on the head wall surface of the bit matrix, and the flat cutting teeth are arranged on the wing segment of the cutting wing located on the side wall surface of the bit matrix and the rear working surface side of the wing segment of the cutting wing located on the head end wall surface of the bit matrix.

[0015] The present invention also provides a drilling tool, including: the axial torsion coupling impact screw according to any one of claims 1 to 6; the PDC bit according to any one of claims 7 to 9; the PDC bit is connected to the free end of the axial impact main shaft.

[0016] The characteristics and advantages of the present invention are: the axial-torsional coupled impact screw provided by the present application increases the torque and axial impact force output of the axial-torsional coupled impact screw by arranging a torsional impact module that can move following the rotation of the torsional impact main shaft and an axial impact module that can move following the rotation of the axial impact main shaft, so that the axial-torsional 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 combines the cutting blade with the impact hammer by designing the impact hammer, thereby increasing the contact area between the PDC drill bit and the formation, 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 A schematic plan view of the structure of a drilling tool provided in an embodiment of the present invention;

[0019] Figure 2 for Figure 1 AA cross-section of

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

[0021] Figure 4 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 conductive state of the side channel hole and the first gap in the embodiment of the present invention);

[0023] Figure 6 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 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 conductive state between the side channel hole and the second gap in an embodiment of the present invention;

[0026] Figure 9Schematic diagram of the rotation result of the torsion impact hammer from the second gap to the first gap in the embodiment of the present invention;

[0027] Figure 10 Explosion schematic diagram of the axial impact screw unit provided in the embodiment of the present invention;

[0028] Figure 11 Stereo structure schematic diagram of the PDC bit provided in the embodiment of the present invention;

[0029] Figure 12 Planar structure schematic diagram of the PDC bit provided in the embodiment of the present invention.

[0030] Explanation of the reference numerals in the attached drawings:

[0031] 10. Axial torsion coupling impact screw;

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

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

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

[0035] 20. PDC bit; 21. Bit matrix; 22. Impact hammer matrix; 23. Vibration impact tooth; 24. Cutting blade wing; 25. Nozzle; 26. Tapered cutting tooth; 27. Planar cutting tooth;

[0036] 100. First gap; 200. Second gap. Detailed implementation manners

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0038] like Figures 1 to 2 As shown, the present invention provides an axial-torsion coupled impact screw 10, comprising a power screw unit 11, a torsion punch screw unit 12 and an axial punch screw unit 13 connected in sequence along a coaxial line; the power screw unit 11 is used to provide power to the torsion punch screw unit 12 and the axial punch screw unit 13 under the action of a fluid medium; the torsion punch screw unit 12 comprises a torsion punch main shaft 121 having a first flow channel and a torsion punch module 122 and a torsion punch housing 123 which are sequentially sleeved on the outside of the torsion punch main shaft 121, the first flow channel being used to receive the fluid medium flowing out of the power screw unit 11, the side wall of the torsion punch main shaft 121 being provided with a wall hole structure for conveying the fluid medium to the torsion punch module 122, the torsion punch main shaft 121 being 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 to 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 sequentially arranged outside the axial impact main shaft 131. 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. The axial impact shell 133 is connected to the torsion impact shell 123.

[0039] Specifically, such as 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. As the fluid displacement is different, 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 will not be 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-torsional coupling impact screw 10 is driven by the power screw unit 11 to output power and first reaches the first flow channel in the torsion impact main shaft 121. 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 to it 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 coupling impact screw 10 by setting 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 coupling impact screw 10 has the beneficial effects of improving the feeding efficiency and broadening the applicable working conditions.

[0040] The housing 111, the shaft 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, which would affect the torque and axial impact force output of the shaft-torsion coupling impact screw 10, and further affect the feeding efficiency and feeding stability of the shaft-torsion coupling impact screw 10. Figure 3 and Figure 10As shown, a first pin hole 1211 is provided on the torsional impact main shaft 121, and a second pin hole 1311 that mates with the first pin hole 1211 is provided on the axial impact main shaft 131. The axial extension length of the second pin hole 1311 is greater than that of the first pin hole 1211. The torsional impact main shaft 121 and the axial impact main shaft 131 achieve axial cooperation through a key pin disposed in the first pin hole 1211 and the second pin hole 1311 and embedded on the first pin hole 1211, and achieve circumferential cooperation through an octagonal sleeve structure. In this way, not only can the stable transmission of torque and rotational power be achieved, but also the axial impact main shaft 131 has a certain degree of axial flexibility to cope with complex and changeable feeding environments.

[0041] According to an embodiment of the present invention, with reference to Figure 3 and Figure 4 As shown, the torsional impact module 122 includes a torsional impact hammer 1221, a torsional impact anvil 1222, and a flow distribution sleeve 1223. Along the feeding direction of the axial-torsional coupling impact screw 10, the torsional impact hammer 1221 is circumferentially movably sleeved on the upstream end of the torsional impact main shaft 121. A part of the side wall of the torsional impact hammer 1221 axially extends along the feeding direction of the axial-torsional coupling impact screw 10 to form a plurality of hammer ribs 12211 arranged at circumferential intervals; the torsional impact anvil 1222 is fixedly sleeved on the downstream end of the torsional impact main shaft 121 and is connected to the axial impact housing 133. A part of the side wall of the torsional impact anvil 1222 axially extends in a direction opposite to the feeding direction of the axial-torsional coupling impact screw 10 to form a plurality of anvil ribs 12221 arranged at circumferential intervals 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 in a cross pattern along the circumferential direction of the torsional impact main shaft 121. The circumferential length between adjacent two anvil ribs 12221 is greater than the circumferential length of the hammer ribs 12211, so as to have a gap space for the fluid medium flowing out from the first flow channel to flow into between the hammer ribs 12211 and the anvil ribs 12221; along the feeding direction of the axial-torsional coupling impact screw 10, the flow distribution sleeve 1223 is fixedly sleeved on the upstream end of the torsional impact main shaft 121, and the inner wall of the flow distribution sleeve 1223 is in contact with the outer walls of the anvil ribs 12221 and the hammer ribs 12211. The flow distribution sleeve 1223 axially extends along the feeding direction of the axial-torsional coupling impact screw 10 to axially contact with the torsional impact anvil 1222. The flow distribution sleeve 1223 is provided with a plurality of axially extending and staggered diversion grooves 12231 at circumferential intervals.

[0042] Specifically, as Figure 3As shown, a first octagonal outer sleeve structure 1212 is formed on the outer wall of the torsion spindle 121, and a first octagonal inner sleeve structure 12232 is formed on the inner wall of the distribution sleeve 1223 to cooperate with the first octagonal outer sleeve structure 1212. The torsion spindle 121 and the distribution sleeve 1223 are fixedly connected by the mutually cooperating octagonal sleeve structures to maintain a high degree of coaxiality and stability between the two, thereby achieving uninterrupted, low-wear continuous rotational power transmission. Under the power output of the power screw unit 11, the distribution sleeve 1223 rotates synchronously with the torsion spindle 121. As the rotation proceeds, the fluid medium in the first flow channel enters the gap space between the side wall of the hammer rib 12211 and the adjacent anvil rib 12221 through the wall hole structure on the torsion spindle 121, and is blocked in this 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 them, 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 through the anvil rib 12221 to the torsion punch main shaft 121 and the shaft punch housing 133 connected to the torsion punch anvil 1222, and finally transmitted to the entire shaft-torsion coupling impact screw 10. As the synchronous rotation of the distribution sleeve 1223 and the torsion main shaft 121 continues, the guide groove 12231 on the distribution sleeve 1223 is connected to the gap space between the 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 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 punch 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 punch 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 impact ram 1221 and the impact anvil 1222 form an intersecting limiting structure through a plurality of ram ribs 12211 and a plurality of anvil ribs 12221 with opposite extension directions and the same extension lengths. This not only enhances the stability of the mating structure between the impact ram 1221 and the impact anvil 1222, but also restricts the flow path of the fluid medium, enabling each ram rib 12211 on the impact ram 1221 to achieve efficient and precise reciprocating impact actions, effectively acting on the impact anvil 1222, so that the shaft-torsion coupling impact screw 10 can generate additional torsional impact force, improving the adaptability to complex feeding environments and the feeding efficiency.

[0043] According to an embodiment of the present invention, as Figure 3 shown, the wall hole structure includes multiple rows of side flow channel hole groups 1213 arranged axially at intervals. Each row of side flow channel hole groups 1213 includes a plurality of side flow channel holes arranged circumferentially at intervals. Referring to Figures 5 to 9 shown, each side flow channel hole is connected to the first flow channel, and the side flow channel holes are circumferentially staggered with the flow guiding groove 12231. Figures 5 to 9 In the figure, the dark arrow indicates the rotation direction of the impact main shaft 121, and the light arrow indicates the movement trend direction of the impact ram 1221. As Figure 5 and Figure 6 shown, when the impact main shaft 121 rotates to a position where the side flow channel hole is connected to the first gap 100 between the ram rib 12211 and an adjacent anvil rib 12221, the fluid medium enters the first gap 100 through the side flow channel hole and is blocked in the sealed cavity formed by the flow distribution sleeve 1223, the impact ram 1221 and the impact anvil 1222 to form a high-pressure area, and the second gap 200 between the ram rib 12211 and another adjacent anvil rib 12221 is connected to the flow guiding groove 12231 to form a low-pressure area. The ram rib 12211 is forced to drive the impact ram 1221 to rotate from the first gap 100 towards the second gap 200 and impact on the anvil rib 12221. As Figure 8 and Figure 9 shown, when the impact main shaft 121 rotates to a position where the side flow channel hole is connected to the second gap 200 between the ram rib 12211 and another adjacent anvil rib 12221, under the action of the fluid medium, the ram rib 12211 is forced to drive the impact ram 1221 to rotate from the second gap 200 towards the first gap 100 and impact on the anvil rib 12221.

[0044] Specifically, as Figures 5 to 9As shown, the side flow channel holes connected to the first flow channel are circumferentially staggered with the diversion groove 12231. In this way, during the synchronous rotation of the flow distribution sleeve 1223 and the torsional impact main shaft 121, the side flow channel holes are never connected to the diversion groove 12231. The fluid medium entering the gap space between the hammer ribs 12211 and the anvil ribs 12221 from the side flow channel holes is blocked by the flow distribution sleeve 1223, causing a high-pressure area to form in this gap space. The gap space between the hammer ribs 12211 and the anvil ribs 12221 that is not connected to the side flow channel holes is opened by the flow distribution sleeve 1223 and is in a low-pressure area, facilitating the efficient and precise reciprocating impact action of each hammer rib 12211. Preferably, the length of the torsional impact main shaft 121 and the number of side flow channel hole groups 1213 can be adjusted to increase the fluid medium flow rate, 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, thereby controlling the rotational speed of the torsional impact main shaft 121 and thus controlling the frequency of the generated torsional impact force. In this embodiment, to simplify the formation of the high and low pressure areas on both sides of the hammer rib 12211, each row of side flow channel hole groups 1213 only includes two circumferentially evenly distributed side flow channel holes.

[0045] According to an embodiment of the present invention, as Figure 3 and Figure 10 shown, a part of the side wall of the torsional impact anvil 1222 axially extends along the feeding direction of the shaft-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 adjacent two first connecting parts 12222. A part of the side wall of the axial impact housing 133 axially extends along the direction opposite to the feeding direction of the shaft-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 adjacent two second connecting parts 1331. The first connecting part 12222 is connected in cooperation with the second connecting groove 1332, and the first connecting groove 12223 is connected in cooperation with the second connecting part 1331.

[0046] Specifically, as Figure 3 and Figure 10 shown, the torsional impact anvil 1222 and the axial impact housing 133 form a keyway cooperation structure in which the first connecting part 12222 and the second connecting part 1331 extend in opposite directions at the docking place, ensuring that the torsional impact force generated during the torsional impact process can be smoothly and efficiently transmitted to the entire shaft-torsion coupling impact screw 10 through the axial impact housing 133, enhancing the overall feeding efficiency of the shaft-torsion coupling impact screw 10.

[0047] According to an embodiment of the present invention, as Figure 3 and Figure 4As shown, along the feeding direction of the shaft-torsion coupling impact screw 10, a plurality of return holes 12224 are spaced at the lower part of the torsion-impact anvil 1222. The return holes 12224 are used to lead back the fluid medium flowing out of the torsion-impact main shaft 121, so that the fluid medium can flow back into the first flow channel and quickly flow to the second flow channel and subsequent components through the first flow channel.

[0048] According to an embodiment of the present invention, as Figure 10 shown, the shaft-impact module 132 includes a disc spring 1321, an impact block 1322, a fixing block 1323 and a set of rollers 1324 arranged between the impact block 1322 and the fixing 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-impact main shaft 131, the impact block 1322 is located at the downstream end of the disc spring 1321 and sleeved on the shaft-impact main shaft 131, and the inner wall of the shaft-impact 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 fixing block 1323 is located at the downstream end of the impact block 1322 and fixedly connected to the shaft-impact main shaft 131 through a transmission sleeve 134. The end of the impact block 1322 close to the fixing block 1323 is provided with a first guide rail 13221 with repeated high and low undulations and circumferentially closed. The end of the fixing block 1323 close to the impact block 1322 is provided with a second guide rail 13231 matching 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. The plurality of rollers 1324 are arranged in a circumferential whole circle to form a set of rollers 1324. When the shaft-impact 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 in the circumferential direction, so that the impact block 1322 moves axially periodically to compress the disc spring 1321. The disc spring 1321 can follow the impact block 1322 to perform periodic reset and generate a periodic axial impact force on the shaft-impact main shaft 131.

[0049] Specifically, along the feeding direction of the shaft-torsion coupling impact screw 10, the disc spring 1321 is sleeved on the shaft impact main shaft 131 between the step of the shaft impact housing 133 and the impact block 1322, and the upper end of the disc spring 1321 is in close contact with the step of the shaft impact housing 133, and the lower end of the disc spring 1321 is in close contact with the impact block 1322. By sleeving the disc spring 1321 on the shaft impact main shaft 131, it is possible to prevent the disc spring 1321 from moving laterally under force, and to make both ends of the disc spring 1321 in close contact with the step of the shaft impact housing 133 and the impact block 1322 respectively, so that the disc spring 1321 can quickly enter the compressed state after being axially compressed and accumulate a large amount of energy. Under the power output of the power screw unit 11, the shaft impact main shaft 131 and the torsion impact main shaft 121 rotate synchronously. The fixing block 1323 fixedly connected to the shaft impact main shaft 131 through the transmission sleeve 134 rotates synchronously with the shaft impact main shaft 131, causing the rollers 1324 arranged in a circle to continuously roll 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 high and low undulations and circumferentially closed at the upper end of the channel, a periodic height difference appears between the first guide rail 13221 and the second guide rail 13231, causing the impact block 1322 to perform periodic reciprocating motion along the axis. Along 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 impact main shaft 131 through the rollers 1324 and the fixing block 1323, thereby increasing the axial impact force of the shaft-torsion coupling impact screw 10 and further improving the feeding efficiency of the shaft-torsion coupling impact screw 10. Among them, in order to prevent the transverse vibration and wear caused by the relative rotational movement between the shaft impact main shaft 131 and the shaft impact housing 133, a TC bearing 135 is provided between the transmission sleeve 134 and the shaft impact housing 133 to reduce the friction between the shaft impact main shaft 131 and the shaft impact housing 133 and to ensure the coaxial rotation of the shaft impact main shaft 131 relative to the shaft impact housing 133. Preferably, the magnitude of the axial impact force can be changed by adaptively adjusting the number of sets of the disc spring 1321 arranged, or the performance parameters of the disc spring 1321, or the periodic height difference between the matching first guide rail 13221 and the second guide rail 13231; the axial impact frequency can be changed by changing the rotational speed of the shaft impact main shaft 131 and the number of repetitions of the matching high and low undulating structure between the first guide rail 13221 and the second guide rail 13231, so as to meet the different requirements of the feeding environment for the axial impact force.

[0050] Such as Figure 11 And Figure 12As shown in the figure, another object of the present invention is to provide a PDC bit 20, comprising: a bit matrix 21, a percussion hammer matrix 22 axially extending from the head of the bit matrix 21, and a plurality of vibration percussion teeth 23 spaced on the percussion hammer matrix 22; a plurality of cutting wings 24 spaced along the circumferential direction of the bit matrix 21, and a plurality of cutting teeth spaced on each cutting wing 24.

[0051] Specifically, as Figure 11 shown in the figure, the bit matrix 21 and the percussion hammer matrix 22 form the body part of the PDC bit 20. A plurality of vibration percussion teeth 23 are spaced on the percussion hammer matrix 22 to form a percussion hammer, and a plurality of cutting wings 24 with a plurality of cutting teeth arranged thereon are spaced along the circumferential direction of the bit matrix 21. By designing the percussion hammer, the cutting wings 24 are combined with the percussion hammer to increase the contact area between the PDC bit 20 and the formation, improve the rock breaking efficiency, and enable the PDC 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 its internal flow channel is provided on the bit matrix 21 between two adjacent cutting wings 24, so as to spray a fluid medium such as drilling fluid through the nozzle 25 during the drilling process of the PDC bit 20 to ensure the cleaning, cuttings backflow, and cooling effects of the PDC bit 20. Preferably, the nozzle 25 adopts an extended conical straight nozzle 25 with a large flow coefficient, the contraction angle is set to 28°, and the length-diameter ratio is set to 5 / 6 to improve the performance of the nozzle 25. In this embodiment, the nozzle 25 partially penetrates the percussion hammer matrix 22 to form a cuttings flow channel.

[0052] Preferably, the bit matrix 21, the hammer matrix 22, and the cutting blade 24 are integrally processed by a five-axis machining center, and the precise positioning of the nozzle 25, the vibration impact teeth 23, and the cutting teeth is achieved numerically controlled. The nozzle 25 is connected to the bit matrix 21 by welding, the cutting teeth are connected to the cutting blade 24 by welding, and the vibration impact teeth 23 are connected to the hammer matrix 22 by welding. Preferably, the vibration impact teeth 23 are in the shape of conical teeth. Under the vibration impact, they have the effects of smaller interaction force, greater penetration depth, high impact energy transfer efficiency, and severe pressure loss under the teeth. To further improve the performance of the vibration impact teeth 23, the axial inclination angle of the vibration impact teeth 23 is 0°, the cone tip radius of the vibration impact teeth 23 is 2 mm, and the cone apex angle is 90°. Preferably, the cutting blade 24 adopts a straight blade structure, and the crown profile angle of the cutting blade 24 is preferably 170° to enhance the attacking performance of the PDC bit 20 and the cleaning effect of the nozzle 25 on the PDC bit 20. Further, the crown of the cutting blade 24 adopts a short profile structure to increase the space of the hammer matrix 22 and enhance the impact ability of the nose shoulder of the cutting blade 24. Preferably, to make the PDC bit 20 have a balanced force during drilling, multiple cutting blades 24 are evenly arranged along the circumferential direction of the bit matrix 21. In this embodiment, there are 5 cutting blades 24 evenly distributed along the circumferential direction on the bit matrix 21, and a hammer matrix 22 is arranged at the center surrounded by the crowns of the 5 cutting blades 24. Preferably, to obtain better drilling efficiency, the ratio of the diameter of the hammer matrix 22 to the diameter of the bit matrix 21 is 0.45. Preferably, to enable the hammer to play a role in all-round and wide-area cutting on the basis of realizing the vibration impact, the vibration impact teeth 23 are spirally distributed along the circumferential direction on the hammer matrix 22. Similarly, the cutting blades 24 can also be spirally distributed on the bit matrix 21 to further improve the all-round and wide-area cutting effect of the PDC bit 20.

[0053] According to an embodiment of the present invention, as Figure 11 and Figure 12 shown, the cutting teeth include conical cutting teeth 26 and flat cutting teeth 27. Along the drilling direction of the PDC bit 20, the conical cutting teeth 26, the vibration impact teeth 23, and the flat cutting teeth 27 sequentially contact the same rock formation to be broken. That is, at the head of the PDC bit 20, the exposed height of the conical cutting teeth 26 is the largest, the exposed height of the vibration impact teeth 23 is the second, and the exposed height of the flat cutting teeth 27 is the smallest. Thus, when using the PDC bit 20 for rock-breaking drilling, the conical cutting teeth 26 pre-break and damage the rock in the form of plowing, and then the vibration impact teeth 23 further impact and damage the hard rock, making the flat cutting teeth 27, which are the main cutting teeth, more easily penetrate into the rock and break the rock. Through the cooperation of the conical cutting teeth 26, the vibration impact teeth 23, and the flat cutting teeth 27, efficient hard rock breaking is achieved, the drilling speed in deep hard rock formations is increased, and the drilling cost is reduced.

[0054] According to an embodiment of the present invention, the conical cutting teeth 26 are disposed on the front working surface side of the blade segment of the cutting blade 24 located on the head wall surface of the drill bit matrix 21, and the flat cutting teeth 27 are disposed on the rear working surface side of the blade segment of the cutting blade 24 located on the side wall surface of the drill bit matrix 21 and the blade segment of the cutting blade 24 located on the head end wall surface of the drill bit matrix 21.

[0055] Specifically, as Figure 11 and Figure 12 shown, along the rotation direction of the PDC drill bit 20, a mixed cutting tooth row and a flat cutting tooth 27 row are sequentially arranged on each cutting blade 24. That is, a mixed cutting tooth row is arranged on the front working surface side of each cutting blade 24, and a flat cutting tooth 27 row is arranged on the rear working surface side of each cutting blade 24. The mixed cutting tooth row and the flat cutting tooth 27 row form a double-row tooth structure on the cutting blade 24. The mixed cutting tooth row includes the conical cutting teeth 26 disposed on the front working surface of the cutting blade 24 and located on the blade segment of the head wall surface of the drill bit matrix 21, and the flat cutting teeth 27 disposed on the front working surface of the cutting blade 24 and located on the blade segment of the side wall surface of the drill bit matrix 21. The flat cutting tooth 27 row includes the flat cutting teeth 27 disposed on the rear working surface of the cutting blade 24. That is, the conical cutting teeth 26 are only disposed on the front working surface side of the blade segment of the cutting blade 24 located on the head wall surface of the drill bit matrix 21, and the flat cutting teeth 27 are disposed on the blade segment (including the front working surface and the rear working surface) of the cutting blade 24 located on the side wall surface of the drill bit matrix 21 and the rear working surface side of the blade segment of the cutting blade 24 located on the head end wall surface of the drill bit matrix 21. Thus, through the mixed tooth arrangement characteristics of the conical cutting teeth 26 and the flat cutting teeth 27 on the cutting blade 24, while achieving efficient crushing of hard rock, the purpose of reducing the stick-slip effect of the PDC drill bit 20 is achieved.

[0056] As Figure 1 and Figure 2 shown, the present invention further provides a drilling tool, including: the shaft torsion coupling 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 shaft impact main shaft 131.

[0057] Specifically, as Figure 2As shown, the shaft-torsion coupling impact screw 10 and the PDC bit 20 are connected and matched to form a drilling tool. Its working principle is as follows: The power screw unit 11 provides rotational speed and torque for the torsion impact main shaft 121 and the axial impact main shaft 131 under the action of a fluid medium (drilling fluid). As the torsion impact main shaft 121 rotates, the torsion impact module 122 reciprocates, converting the hydraulic energy of the fluid medium (drilling fluid) into mechanical energy, and providing an additional torsional impact force with a certain frequency and a certain torque for the PDC bit 20 as the end effector. As the axial impact main shaft 131 rotates, the axial impact module 132 periodically operates, converting elastic potential energy into mechanical energy, and providing an axial impact force with a certain frequency and a certain load for the PDC bit 20 as the end effector; under the coupled action of the axial impact force and the torsional impact force, combined with the tooth arrangement characteristics of the PDC bit 20, the conical cutting teeth 26 pre-crush and damage the rock in the form of plowing. Subsequently, the vibration impact teeth 23 further impact and damage the hard rock, making the flat cutting teeth 27 as the main cutting teeth more easily penetrate and break the rock. Through the cooperation of the conical cutting teeth 26, the vibration impact teeth 23 and the flat cutting teeth 27, efficient crushing of hard rock is achieved, the drilling speed in deep hard rock formations is increased, and the drilling cost is reduced.

[0058] Based on the above structural description, in the embodiment of the present application, the shaft-torsion coupling impact screw 10 is provided with a torsion impact module 122 that can reciprocate following the rotation of the torsion impact main shaft 121 and an axial impact module 132 that can perform periodic motion following the rotation of the axial impact main shaft 131, increasing the output of the torque and axial impact force of the shaft-torsion coupling impact screw 10, so that the shaft-torsion coupling impact screw 10 has the beneficial effects of improving the feeding efficiency and broadening the applicable working conditions; in the embodiment of the present application, the PDC bit 20 is designed with an impact hammer, so that the cutting blade 24 is combined with the impact hammer, increasing the contact area between the PDC bit 20 and the formation, improving the rock-breaking efficiency, and enabling the PDC bit 20 to adapt to complex drilling conditions such as hard formations, abrasive formations, and difficult-to-drill heterogeneous formations; in the embodiment of the present application, the provided drilling tool connects and matches the shaft-torsion coupling impact screw 10 and the PDC bit 20, so that the PDC bit 20 has the beneficial effects of efficiently crushing hard rock, increasing the drilling speed in deep hard rock formations, and reducing the drilling cost under the coupled action of the axial impact force and the torsional impact force.

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

Claims

1. A shaft-torsion coupled impact screw, characterized in that: It includes a power screw unit, a torsion punch screw unit and an axial punch screw unit which are coaxially connected in sequence; 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 includes a torsion punch main shaft having a first flow channel, a torsion punch module and a torsion punch housing which are sequentially sleeved on the torsion punch main shaft, wherein the first flow channel is used to receive the fluid medium flowing out of the power screw unit, and a wall hole structure for conveying the fluid medium to the torsion punch module is provided on the side wall of the torsion punch main shaft, and 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 to 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 outside of 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-torsion 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 distribution sleeve; Along the feeding direction of the axial-torsionally coupled impact screw, the torsion 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-torsionally coupled 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 is 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-torsionally coupled impact screw to form a plurality of anvil ribs arranged at circumferential intervals 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-torsional coupling 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. The distribution sleeve extends axially along the feeding direction of the axial-torsional coupling impact screw to axially connect with the torsion punch anvil, and the distribution sleeve is circumferentially spaced with a plurality of axially extending guide grooves staggered with the wall hole structure.

3. The axial-torsionally coupled impact screw according to claim 2, characterized in that: The wall hole structure includes multiple rows of side flow channel hole groups arranged at intervals in the axial direction, each row of the side flow channel hole groups includes multiple 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 and the guide groove are circumferentially staggered. 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 forced to drive the torsion punch hammer to rotate from the first gap to 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 forced to drive the torsion punch hammer to rotate from the second gap to the first gap and hit the anvil rib.

4. The axial-torsion 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 return holes are arranged at intervals on the lower part of the torsion anvil, and the return 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 torsionally coupled 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 near the fixed block is provided with a first guide rail with repeated high and low fluctuations and circumferentially closed, the end of the fixed block near the impact block is provided with a second guide rail matching 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 perform periodic reset and generate periodic axial impact force on the shaft punch spindle.

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

8. The drilling tool according to claim 7, characterized in that The PDC drill bit comprises: A drill bit base body, wherein the head of the drill bit base body extends axially to form an impact hammer base body, and a plurality of vibrating 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.

9. The drilling tool according to claim 8, 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 sequentially contact the same rock formation to be broken.

10. The drilling tool according to claim 9, 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.

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