A dual mode self-renewing drill bit for drilling hard formations

Abstract

The application discloses a double-mode self-renewal drill bit for drilling hard strata and relates to the technical field of natural gas drilling engineering, which comprises a drill bit body, a containing bin is processed in the drill bit body, a threaded pin is arranged on the top of the drill bit body, the threaded pin is connected with the drill bit body through a pin and a thread, a gear frame is arranged on the inner wall of the containing bin, a self-renewal assembly is symmetrically arranged on the gear frame, the self-renewal assembly comprises vertically arranged transmission teeth, a tooth drum is arranged at the bottom of the transmission teeth, the tooth drum is rotationally connected with the drill bit body, a push-out self-renewal assembly is arranged at the bottom of the containing bin, a rotating assembly is arranged at the top of the containing bin, the rotating assembly is sleeved on a half shaft, the half shaft is connected with the push-out self-renewal assembly through a spline sleeve, when the working surface of the tooth part is worn due to grinding and impact, drilling fluid is input into the drill bit body to drive the rotating assembly to rotate, the working surface of the tooth drum can be quickly switched through the device, the tooth drum is switched to the non-worn working surface to continue participating in cutting, and the utilization rate of the tooth drum is fully exploited.

Description

Technical Field

[0001] This invention relates to the field of natural gas drilling engineering technology, specifically a dual-mode self-renewing drill bit for drilling in hard formations. Background Technology

[0002] In the field of oil and gas drilling engineering, especially in drilling operations in deep wells, ultra-deep wells, and complex hard rock formations, PDC drill bits have become one of the mainstream drilling tools due to their advantages of high rock-breaking efficiency and long service life. The core of the rock-breaking performance of PDC drill bits depends on the PDC teeth on the cutter blades. The PDC teeth are in direct contact with the formation rock and are subjected to complex loads such as impact, grinding, and shearing during drilling, making them prone to failure problems such as wear, tooth breakage, and tooth loss.

[0003] To address these issues, the industry has successively developed PDC drill bits with self-renewal functions. However, these PDC drill bits may experience unstable power transmission, such as jamming or transmission failure, under conditions of large pressure fluctuations or other harsh conditions. Furthermore, the steering control capability used to switch PDC teeth is not precise enough.

[0004] Therefore, a dual-mode self-renewing drill bit for drilling hard formations was developed, which can fill the gaps in existing technologies and achieve precise drill bit replacement and stable power transmission. Summary of the Invention

[0005] The purpose of this invention is to provide a dual-mode self-renewing drill bit for drilling in hard formations, in order to solve the problems raised in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A dual-mode self-renewing drill bit for drilling hard formations includes a drill bit body, a housing chamber machined within the drill bit body, a threaded connection at the top of the drill bit body, the threaded connection being connected to the drill bit body via a pin and threads, a gear frame provided on the inner wall of the housing chamber, self-renewing components symmetrically arranged on the gear frame, each self-renewing component including vertically arranged transmission teeth, a toothed drum at the bottom of each transmission tooth, the toothed drum being rotatably connected to the drill bit body, an ejection self-renewing component at the bottom of the housing chamber, and a rotating component at the top of the housing chamber, the rotating component being sleeved on the half-shaft, the half-shaft being connected to the ejection self-renewing component via a spline sleeve.

[0007] As a preferred technical solution, a positioning shaft is provided in the middle of the transmission gear, the positioning shaft is rotatably connected to the gear frame, a bevel gear is fixedly connected to the end face of the top transmission gear, PDC teeth are evenly arranged around the side wall of the tooth drum, the tooth drum is located at the bottom of the accommodating chamber, and the tooth drum part extends out of the drill bit body.

[0008] As a preferred technical solution, the self-renewing ejection assembly includes an adjusting spring fixed to the bottom of the accommodating compartment, a blade retainer is provided on the top of the adjusting spring, an ejection block is fixedly installed on the top of the blade retainer, the ejection block is connected to an end face ratchet, and the end face ratchet is sleeved on the drive shaft.

[0009] As a preferred technical solution, the blade holder has symmetrically arranged connecting shafts on its sidewalls, the connecting shafts are fixedly connected to the ejector blades, the ejector blades have PDC teeth evenly arranged on them, the blade holder has several mounting slots, one end of the ejector block is embedded in the mounting slot, and the other end of the ejector block has an inclined surface.

[0010] As a preferred technical solution, the side of the end face ratchet is provided with a ratchet groove, the groove depth of which varies uniformly, the inclined surface engages with the bottom of the ratchet groove, the side wall of the drive shaft is provided with a limiting platform, the end face ratchet is located at the bottom of the limiting platform, and the top of the drive shaft is provided with a secondary spline shaft.

[0011] As a preferred technical solution, the rotating assembly includes a hydraulic reversing wheel and a hydraulic starter sleeved on the outside of the hydraulic reversing wheel. A keyway is provided on the outside of the hydraulic reversing wheel. The keyway includes a locking groove located above and a movable groove located below. The locking groove and the movable groove are connected by an inclined groove. A cylindrical pin is provided on the inner wall of the hydraulic starter. A hydraulic spring is provided at the bottom of the hydraulic starter.

[0012] As a preferred technical solution, the half shaft is fixedly connected to the hydraulic reversing wheel, a mounting platform is provided on the half shaft, the hydraulic spring is fixed on the mounting platform, an active bevel gear is sleeved on the half shaft, the active bevel gear is fixedly connected to the half shaft, and a main spline shaft is provided at the bottom of the half shaft.

[0013] As a preferred technical solution, the spline sleeve is used to connect the half shaft and the drive shaft, and the inner wall of the spline sleeve is provided with a spline groove.

[0014] As a preferred technical solution, a fixed drill bit is symmetrically arranged at the bottom of the drill bit body, and PDC teeth are evenly arranged on the fixed drill bit.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. When a working surface of the tooth is worn due to grinding and impact, drilling fluid is introduced into the drill bit body. The pressure of the drilling fluid drives the rotating component to rotate, which in turn drives the self-renewing component to rotate, and finally drives the tooth drum at the bottom of the drill bit body to rotate. This device can quickly switch the working surface of the tooth drum to the unworn working surface to continue to participate in cutting, thus fully maximizing the utilization rate of a single tooth drum. 2. When all working surfaces of the tooth drum are worn, the rotating component can drive the self-renewing component to be pushed out when it continues to rotate. This will precisely push the push-out blades, which are pre-placed inside the drill bit, out of the drill bit body, achieving seamless replacement of the failed tooth with the spare tooth. This avoids the entire drill bit stopping due to the failure of the tooth drum. When the spare tooth participates in cutting, its effective working time can still be further extended through the rotating mechanism. Compared with a single push-out drill bit, this greatly improves the utilization rate of the spare tooth and greatly increases the service life of the drill bit body. 3. The combined transmission structure of hydraulic steering wheel and end face ratchet can improve the drill bit body's resistance to vibration and cuttings intrusion. It can stably output power in harsh drilling conditions such as deep wells and hard rock, ensure the reliable execution of the self-renewal function, and avoid cutting interruption caused by mechanism jamming or failure. Through the cooperation of various self-renewal components, the number of tripping in and out of the hole can be greatly reduced, the drilling cycle can be shortened, and the overall cost of drilling operations can be reduced. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the main structure of the present invention; Figure 2 This is a cross-sectional structural diagram of the main body of the present invention; Figure 3 This is a cross-sectional structural diagram of the main body of the present invention from another perspective; Figure 4 This is a cross-sectional structural diagram of the rotating component of the present invention; Figure 5 This is a schematic diagram of the structure of the self-updating component introduced in this invention; Figure 6 yes Figure 2 A magnified structural diagram at point A in the diagram.

[0017] In the diagram: 1. Drill bit body; 2. Self-updating component; 3. Ejection self-updating component; 4. Rotation component; 5. Half-shaft; 6. Spline sleeve; 11. Receptacle; 12. Threaded thread; 13. Gear holder; 14. Fixed drill bit; 21. Drive gear; 22. Gear drum; 23. Bevel gear; 31. Adjusting spring; 32. Blade retainer; 33. Ejection block; 34. End face ratchet; 35. Drive shaft; 36. Ejection blade; 41. Hydraulic reversing wheel; 42. Hydraulic starter; 43. Hydraulic spring; 51. Mounting platform; 52. Drive bevel gear; 53. Main spline shaft; 61. Spline groove; 1201, Pin; 2101, Positioning Shaft; 2201, PDC Gear; 3201, Connecting Shaft; 3202, Mounting Slot; 3301, Inclined Surface; 3401, Racket Groove; 3501, Limiting Stage; 3502, Secondary Spline Shaft; 4101, Keyway; 4102, Locking Slot; 4103, Movable Slot; 4104, Inclined Slot; 4201, Cylindrical Pin. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Example: Figures 1-6 As shown, this invention provides a technical solution for a dual-mode self-renewing drill bit for drilling hard formations. The dual-mode self-renewing drill bit for drilling hard formations includes a drill bit body 1, with a receiving chamber 11 inside the drill bit body 1. A threaded thread 12 is provided on the top of the drill bit body 1, and the threaded thread 12 is fixed to the drill bit body 1 by a pin 1201. A gear frame 13 is provided on the inner wall of the receiving chamber 11, and self-renewing components 2 are symmetrically arranged on the gear frame 13. The self-renewing components 2 include vertically arranged transmission teeth 21, and a toothed drum 22 is provided at the bottom of the transmission teeth 21, which is rotatably connected to the drill bit body 1. A push-out self-renewing component 3 is provided at the bottom of the receiving chamber 11, and a rotating component 4 is provided at the top of the receiving chamber 11. The rotating component 4 is sleeved on a half-shaft 5, and the half-shaft 5 is connected to the push-out self-renewing component 4 by a spline sleeve 6. The drill bit body 1 can support the entire drill bit and... To protect and ensure that the internal structure is not damaged, the self-renewing component 2, in cooperation with the rotating component 4, can achieve precise switching of the working surface of the end toothed drum 22, improving the utilization rate of the toothed drum 22. When all working surfaces of the toothed drum 22 are worn, the self-renewing component 3, in cooperation with the rotating component 4, can eject the spare ejection blade 36, enabling seamless replacement of the toothed drum 22 with the spare tooth without stopping the machine, and continuing drilling work, greatly improving drilling efficiency. The connection relationship between the half shaft 5, the spline sleeve 6 and the drive shaft 35 is a transition fit. This connection and fit design can effectively ensure the stability and accuracy of power transmission, avoid faults such as excessive transmission clearance, mechanism jamming or tooth dislodgement under strong vibration conditions downhole, and ensure that the end face ratchet 34 can drive the self-renewing component 3 to move according to the preset command.

[0020] A positioning shaft 2101 is provided in the middle of the transmission gear 21. The positioning shaft 2101 is rotatably connected to the gear frame 13. A bevel gear 23 is fixedly connected to the end face of the top transmission gear 21. PDC teeth 2201 are evenly arranged around the side wall of the tooth drum 22. The tooth drum 22 is located at the bottom of the accommodating chamber 11, and part of the tooth drum 22 extends out of the drill bit body 1.

[0021] The self-updating component 3 includes an adjusting spring 31 fixed to the bottom of the accommodating chamber 11. A blade retainer 32 is provided on the top of the adjusting spring 31. An ejection block 33 is fixedly installed on the top of the blade retainer 32. The ejection block 33 is connected to an end face ratchet 34. The end face ratchet 34 is sleeved on the drive shaft 35.

[0022] The blade holder 32 has symmetrically arranged connecting shafts 3201 on its side wall. The connecting shafts 3201 are fixedly connected to the ejector blade 36. PDC teeth 2201 are evenly arranged on the ejector blade 36. The blade holder 32 has several mounting slots 3202. One end of the ejector block 33 is embedded in the mounting slot 3202. The other end of the ejector block 33 is provided with an inclined surface 3301. The inclined surface on the top of the ejector block 33 has a certain slope, which is the helical helix angle of the end face ratchet, to ensure the accuracy of the movement between parts.

[0023] The main spline shaft 53 at the bottom of the half shaft 5, the spline sleeve 6, and the auxiliary spline shaft 3502 at the top of the transmission shaft 35 are in transition fit. This connection and fit design can effectively ensure the stability and accuracy of power transmission, avoid faults such as excessive transmission clearance, mechanism jamming or tooth loss under strong vibration conditions in the well, and ensure that the end face ratchet 34 can drive the self-renewing component 3 to move according to the preset command.

[0024] When the working face of the toothed drum 22 is severely worn, drilling fluid is introduced into the accommodating chamber 11. By adjusting the pressure of the external drilling fluid, the hydraulic starter 42 is pressed down. In the initial state, the cylindrical pin 4201 inside the hydraulic starter 42 is embedded in the locking groove 4102. When the hydraulic starter 42 is pressed down, the cylindrical pin 4201 moves down away from the locking groove 4102 and enters the movable groove 4103 along the inclined groove 4204. Since the hydraulic reversing wheel 41 is fixed to the half shaft 5, and the hydraulic starter 42 can only move axially up and down, the cylindrical pin 4201 moves down through the inclined groove 4204. During the process, the entire hydraulic reversing wheel 41 will rotate, which in turn will drive the half shaft 5 fixed to the hydraulic reversing wheel 41 to rotate. The bottom of the half shaft 5 is fitted with the active bevel gear 52 fixed on the half shaft 5. Therefore, when the half shaft 5 rotates, it will drive the active bevel gear 52 to rotate. The active bevel gear 52 will mesh with the bevel gear 23. The bevel gear 23 will drive the transmission gear 21 to rotate synchronously. Then, through the power transmission of several transmission gears 21, the bottom tooth drum 22 will finally rotate. During the rotation, the tooth drum 22 will completely replace the worn PDC tooth 2201 at the bottom, realizing the self-renewal of the PDC tooth 2201.

[0025] The end face ratchet 34 has a ratchet groove 3401 on its side. The depth of the ratchet groove 3401 varies evenly. The inclined surface 3301 meshes with the bottom of the ratchet groove 3401. The drive shaft 35 has a limiting platform 3501 on its side wall. The end face ratchet 34 is located at the bottom of the limiting platform 3501. The drive shaft 35 has a secondary spline shaft 3502 on its top.

[0026] The rotating assembly 4 includes a hydraulic reversing wheel 41 and a hydraulic actuator 42 sleeved on the outside of the hydraulic reversing wheel 41. A keyway 4101 is provided on the outside of the hydraulic reversing wheel 41. The keyway 4101 includes a locking groove 4102 located above and a movable groove 4103 located below. The locking groove 4102 and the movable groove 4103 are connected by an inclined groove 4104. A cylindrical pin 4201 is provided on the inner wall of the hydraulic actuator 42, and a hydraulic spring 43 is provided at the bottom of the hydraulic actuator 42.

[0027] As the working surface of the toothed drum 22 wears and is continuously renewed, it will eventually wear out completely. During the rotation of the rotating component 4, the bottom self-renewing component 3 will also rotate synchronously through the spline sleeve 6. The self-renewing component 3 first receives power from the rotating component 4 through the drive shaft 35. The rotation of the drive shaft 35 drives the end face ratchet 34 to rotate. As the ratchet groove 3401 on the end face ratchet 34 rotates, the groove depth that meshes with the ejection block 33 continuously decreases, thereby continuously pressing down the ejection block 33. Since the ejection block 33 is fixedly connected to the cutter wing retainer 32, the continuous downward movement of the ejection block 33 will drive the ejection cutter wing 36 on the cutter wing retainer 32 to be ejected from the receiving chamber 11. While the ejection block 33 is pressing down, it will compress the adjusting spring 31, and use the ejection cutter wing 36 as a spare tooth to continue drilling work. This allows the drill bit to continue operating without stopping, greatly improving the utilization rate of spare teeth and the drilling efficiency.

[0028] As the ejector blade 36, which serves as a spare tooth, extends continuously, the PDC teeth 2201 on the ejector blade 36 are also continuously worn. When all the PDC teeth on the ejector blade 36 are worn, the rotating component 4 drives the end face ratchet 34 to rotate one revolution, and the ejector block 33 re-embeds into the highest point of the ratchet groove 3401. At this time, the compressed adjusting spring 31 drives the blade retainer 32 to move upward again, and the ejector blade 36 retracts into the receiving chamber 11. At this time, the tooth drum 22 and the ejector blade 36 need to be replaced. Through the cooperation of the rotating component 4 with the self-renewal component 2 and the ejector self-renewal component 3, the utilization rate of the tooth drum 22 and the ejector blade 36 can be improved, and the time required for tooth replacement can be shortened, which greatly improves the drilling efficiency.

[0029] The spline sleeve 6 is used to connect the half shaft 5 and the drive shaft 35. The inner wall of the spline sleeve 6 is provided with a spline groove 61.

[0030] A fixed drill bit 14 is symmetrically arranged at the bottom of the drill bit body 1, and PDC teeth 2201 are evenly arranged on the fixed drill bit 14.

[0031] Working principle of the invention: When the working face of the toothed drum 22 is severely worn, drilling fluid is introduced into the accommodating chamber 11. By adjusting the pressure of the external drilling fluid, the hydraulic starter 42 is pressed down. In the initial state, the cylindrical pin 4201 inside the hydraulic starter 42 is embedded in the locking groove 4102. When the hydraulic starter 42 is pressed down, the cylindrical pin 4201 moves down away from the locking groove 4102 and enters the movable groove 4103 along the inclined groove 4204. Since the hydraulic reversing wheel 41 is fixed to the half shaft 5, and the hydraulic starter 42 can only move axially up and down, the cylindrical pin 4201 moves down through the inclined groove 4204. During the process, the entire hydraulic reversing wheel 41 will rotate, which in turn will drive the half shaft 5 fixed to the hydraulic reversing wheel 41 to rotate. The bottom of the half shaft 5 is fitted with the active bevel gear 52 fixed on the half shaft 5. Therefore, when the half shaft 5 rotates, it will drive the active bevel gear 52 to rotate. The active bevel gear 52 will mesh with the bevel gear 23. The bevel gear 23 will drive the transmission gear 21 to rotate synchronously. Then, through the power transmission of several transmission gears 21, the bottom tooth drum 22 will finally rotate. During the rotation, the tooth drum 22 will completely replace the worn PDC tooth 2201 at the bottom, realizing the self-renewal of the PDC tooth 2201.

[0032] As the working surface of the toothed drum 22 wears and is continuously renewed, it will eventually wear out completely. During the rotation of the rotating component 4, the bottom self-renewing component 3 will also rotate synchronously through the spline sleeve 6. The self-renewing component 3 first receives power from the rotating component 4 through the drive shaft 35. The rotation of the drive shaft 35 drives the end face ratchet 34 to rotate. As the ratchet groove 3401 on the end face ratchet 34 rotates, the groove depth that meshes with the ejection block 33 continuously decreases, thereby continuously pressing down the ejection block 33. Since the ejection block 33 is fixedly connected to the cutter wing retainer 32, the continuous downward movement of the ejection block 33 will drive the ejection cutter wing 36 on the cutter wing retainer 32 to be ejected from the receiving chamber 11. While the ejection block 33 is pressing down, it will compress the adjusting spring 31, and use the ejection cutter wing 36 as a spare tooth to continue drilling work. This allows the drill bit to continue operating without stopping, greatly improving the utilization rate of spare teeth and the drilling efficiency.

[0033] As the ejector blade 36, which serves as a spare tooth, extends continuously, the PDC teeth 2201 on the ejector blade 36 are also continuously worn. When all the PDC teeth on the ejector blade 36 are worn, the rotating component 4 drives the end face ratchet 34 to rotate one revolution, and the ejector block 33 re-embeds into the highest point of the ratchet groove 3401. At this time, the compressed adjusting spring 31 drives the blade retainer 32 to move upward again, and the ejector blade 36 retracts into the receiving chamber 11. At this time, the tooth drum 22 and the ejector blade 36 need to be replaced. Through the cooperation of the rotating component 4 with the self-renewal component 2 and the ejector self-renewal component 3, the utilization rate of the tooth drum 22 and the ejector blade 36 can be improved, and the time required for tooth replacement can be shortened, which greatly improves the drilling efficiency.

[0034] The self-updating component 3 includes an adjusting spring 31 fixed to the bottom of the accommodating chamber 11. A blade retainer 32 is provided on the top of the adjusting spring 31. An ejection block 33 is fixedly installed on the top of the blade retainer 32. The ejection block 33 is connected to an end face ratchet 34. The end face ratchet 34 is sleeved on the drive shaft 35.

[0035] The blade holder 32 has symmetrically arranged connecting shafts 3201 on its side wall. The connecting shafts 3201 are fixedly connected to the ejector blade 36. PDC teeth 2201 are evenly arranged on the ejector blade 36. The blade holder 32 has several mounting slots 3202. One end of the ejector block 33 is embedded in the mounting slot 3202. The other end of the ejector block 33 is provided with an inclined surface 3301. The inclined surface on the top of the ejector block 33 has a certain slope, which is the helical helix angle of the end face ratchet, to ensure the accuracy of the movement between parts.

[0036] When a working surface of the tooth is worn due to grinding and impact, drilling fluid is introduced into the drill bit body 1. The pressure of the drilling fluid drives the rotating component 4 to rotate, which in turn drives the self-renewing component 2 to rotate. Ultimately, this drives the tooth drum 22 at the bottom of the drill bit body 1 to rotate. This device can quickly switch the working surface of the tooth drum 22, allowing it to switch to an unworn working surface to continue participating in cutting, thus maximizing the utilization rate of a single tooth drum 22.

[0037] When all working surfaces of the toothed drum 22 are worn, the rotating component 4 continues to rotate, which can drive the self-renewing component 3 to push the pre-placed push-out blade 36 inside the drill bit to the outside of the drill bit body 1, realizing seamless replacement of the failed tooth with the spare tooth, avoiding the overall shutdown of the drill bit due to the failure of the toothed drum 22. When the spare tooth participates in cutting, the push-out blade 36 can still be continuously ejected by the rotating component 4, further extending its effective working time. Compared with a single push-out type drill bit, it greatly improves the utilization rate of spare teeth and greatly improves the service life of the drill bit body 1.

[0038] The combined transmission structure of the hydraulic reversing wheel 41 and the end face ratchet 34 can improve the vibration resistance and cuttings intrusion resistance of the drill bit body 1. It can stably output power under harsh drilling conditions such as deep wells and hard rock, ensure the reliable execution of the self-renewal function, and avoid cutting interruption caused by mechanism jamming or failure. Through the cooperation of various self-renewal components, the number of tripping in and out of the hole can be greatly reduced, the drilling cycle can be shortened, and the overall cost of drilling operations can be reduced.

[0039] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A dual-mode self-renewing drill bit for drilling in hard formations, characterized in that: The dual-mode self-renewing drill bit for drilling hard formations includes a drill bit body (1), a housing (11) machined inside the drill bit body (1), a threaded thread (12) provided on the top of the drill bit body (1), the threaded thread (12) being connected to the drill bit body (1) by a pin (1201) and threads, a gear frame (13) provided on the inner wall of the housing (11), a self-renewing component (2) symmetrically provided on the gear frame (13), the self-renewing component (2) including vertically arranged transmission teeth (21), a tooth drum (22) provided at the bottom of the transmission teeth (21), the tooth drum (22) being rotatably connected to the drill bit body (1), an ejection self-renewing component (3) provided at the bottom of the housing (11), a rotating component (4) provided at the top of the housing (11), the rotating component (4) being sleeved on the half shaft (5), and the half shaft (5) being connected to the ejection self-renewing component (4) by a spline sleeve (6).

2. The dual-mode self-renewing drill bit for drilling hard formations according to claim 1, characterized in that: A positioning shaft (2101) is provided in the middle of the transmission gear (21). The positioning shaft (2101) is rotatably connected to the gear frame (13). A bevel gear (23) is fixedly connected to the end face of the transmission gear (21) at the top. PDC teeth (2201) are evenly arranged around the side wall of the tooth drum (22). The tooth drum (22) is located at the bottom of the accommodating chamber (11). The tooth drum (22) extends out of the drill bit body (1).

3. A dual-mode self-renewing drill bit for drilling hard formations according to claim 2, characterized in that: The self-renewing ejection assembly (3) includes an adjusting spring (31) fixed at the bottom of the receiving compartment (11), a blade holder (32) is provided on the top of the adjusting spring (31), an ejection block (33) is fixedly installed on the top of the blade holder (32), the ejection block (33) is connected to an end face ratchet (34), and the end face ratchet (34) is sleeved on the drive shaft (35).

4. A dual-mode self-renewing drill bit for drilling hard formations according to claim 3, characterized in that: The blade holder (32) has a connecting shaft (3201) symmetrically arranged on its side wall. The connecting shaft (3201) is fixedly connected to the ejector blade (36). PDC teeth (2201) are evenly arranged on the ejector blade (36). The blade holder (32) has several mounting slots (3202). One end of the ejector block (33) is embedded in the mounting slot (3202). The other end of the ejector block (33) is provided with an inclined surface (3301).

5. A dual-mode self-renewing drill bit for drilling hard formations according to claim 4, characterized in that: The end face ratchet (34) has a ratchet groove (3401) on its side. The depth of the ratchet groove (3401) varies uniformly. The inclined surface (3301) meshes with the bottom of the ratchet groove (3401). The side wall of the drive shaft (35) is provided with a limiting platform (3501). The end face ratchet (34) is located at the bottom of the limiting platform (3501). The top of the drive shaft (35) is provided with a secondary spline shaft (3502).

6. A dual-mode self-renewing drill bit for drilling hard formations according to claim 5, characterized in that: The rotating assembly (4) includes a hydraulic reversing wheel (41) and a hydraulic actuator (42) sleeved on the outside of the hydraulic reversing wheel (41). A keyway (4101) is provided on the outside of the hydraulic reversing wheel (41). The keyway (4101) includes a locking groove (4102) located above and a movable groove (4103) located below. The locking groove (4102) and the movable groove (4103) are connected by a slant groove (4104). A cylindrical pin (4201) is provided on the inner wall of the hydraulic actuator (42), and a hydraulic spring (43) is provided at the bottom of the hydraulic actuator (42).

7. A dual-mode self-renewing drill bit for drilling hard formations according to claim 6, characterized in that: The half shaft (5) is fixedly connected to the hydraulic reversing wheel (41). A mounting platform (51) is provided on the half shaft (5). The hydraulic spring (43) is fixed on the mounting platform (51). An active bevel gear (52) is sleeved on the half shaft (5). The active bevel gear (52) is fixedly connected to the half shaft (5). A main spline shaft (53) is provided at the bottom of the half shaft (5).

8. A dual-mode self-renewing drill bit for drilling hard formations according to claim 7, characterized in that: The spline sleeve (6) is used to connect the half shaft (5) and the drive shaft (35), and the inner wall of the spline sleeve (6) is provided with a spline groove (61).

9. A dual-mode self-renewing drill bit for drilling hard formations according to claim 8, characterized in that: The bottom of the drill bit body (1) is symmetrically provided with fixed drill bits (14), and PDC teeth (2201) are evenly provided on the fixed drill bits (13).

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