A recharging well high pressure drilling PDC coring bit

Abstract

This invention relates to the field of drilling tool technology and discloses a PDC coring drill bit for high-pressure drilling in reinjection wells. The bit includes a drill bit body and a drill bit crown fixedly connected to the top of the drill bit body; a cutter blade assembly including several PDC teeth and several gauge-keeping components; the PDC teeth are circumferentially fixedly connected to the drill bit crown, and the gauge-keeping components are disposed on the PDC teeth; a spray assembly including several nozzles and several water delivery channels; several chip removal grooves are circumferentially formed on the drill bit crown, located between adjacent PDC teeth for removing chipping; the nozzles are mounted on the top of the chip removal grooves; the water delivery channels are disposed within the drill bit crown and communicate with the nozzles; and a sealing connection assembly including a seal and a connector. After the nozzle is limited and connected to the drill bit crown via the connector, the nozzle is sealed to the water delivery channels via the seal. This invention solves the problems of poor gauge-keeping stability, low sealing reliability, and low slag removal efficiency, thereby improving drilling efficiency, extending the service life of the drill bit, and increasing borehole efficiency.

Description

Technical Field

[0001] This invention relates to the field of drilling tool technology, and in particular to a PDC coring bit for high-pressure drilling in reinjection wells. Background Technology

[0002] During high-pressure reinjection well drilling, traditional PDC coring bits have the following technical defects:

[0003] 1. Insufficient gauge protection performance: During drilling, PDC drill bits may encounter poor formation drillability, such as interlayers, gravel layers, or hard rock formations. The cutting teeth of the PDC drill bit will wear out quickly. The gauge protection structure on the outer edge of the drill bit is prone to uneven wear due to high-pressure fluid erosion and hard rock friction, which may cause wellbore deviation or wellbore enlargement and reduce the quality of coring.

[0004] 2. High risk of sealing failure: The main function of high-pressure drilling fluid in PDC drill bits is to transport cuttings, clean the bottom of the well, and cool the drill bit. When the sealing is insufficient during use, high-pressure drilling fluid can easily invade the drill bit bearing cavity, leading to lubrication failure and premature drill bit failure, affecting the life of the drill bit and the cuttings removal effect.

[0005] 3. In existing technologies, high-pressure drilling fluid is often sprayed through nozzles installed at the front end of the drill bit. During use, the nozzles need to be replaced or cleaned. The installation and disassembly of the nozzles in existing technologies are not convenient enough, which affects the overall construction efficiency.

[0006] Therefore, there is an urgent need for a high-pressure drilling PDC coring bit for reinjection wells to solve the above problems. Summary of the Invention

[0007] The purpose of this invention is to provide a PDC coring bit for high-pressure drilling in reinjection wells to solve the problems existing in the prior art.

[0008] To achieve the above objectives, the present invention provides the following solution: The present invention provides a PDC coring drill bit for high-pressure drilling in reinjection wells, comprising a drill bit body and a drill bit crown fixedly connected to the top end of the drill bit body, and further comprising:

[0009] The cutter blade assembly includes a plurality of PDC teeth and a plurality of gauge protection components. The plurality of PDC teeth are fixedly connected to the crown of the drill bit in the circumferential direction, and the gauge protection components are disposed on the PDC teeth.

[0010] The spray assembly includes several nozzles and several water supply channels. Several chip removal grooves are circumferentially opened on the crown of the drill bit. The chip removal grooves are located between two adjacent PDC teeth and are used to remove waste chips. The nozzles are installed at the top of the chip removal grooves. The water supply channels are arranged in the crown of the drill bit and communicate with the nozzles.

[0011] A sealing connection assembly includes a seal and a connector. After the nozzle is connected to the crown of the drill bit via the connector, the nozzle is sealed to the water supply channel via the seal.

[0012] According to the present invention, a PDC coring bit for high-pressure drilling in reinjection wells is provided. The gauge protection component includes stepped gauge protection teeth, which are installed on the PDC teeth. The stepped gauge protection teeth have a three-stage stepped structure, with the first stage being a cemented carbide matrix gauge protection tooth, the second stage being a diamond composite layer gauge protection tooth, and the third stage being a ceramic gauge protection strip.

[0013] According to the present invention, a PDC coring bit for high-pressure drilling of reinjection wells includes a nozzle comprising a main housing, a support column connected to the bottom end of the main housing, a main channel opened in the middle of the main housing, and a plurality of secondary channels opened circumferentially along the upper part of the main housing. A pipe is fixedly connected inside the support column, one end of the pipe is connected to the water delivery channel, and the main channel and the plurality of secondary channels are respectively connected to the other end of the pipe. A high-pressure jet nozzle is installed at the water outlet end of the main channel, and an atomizing nozzle is installed at the water outlet end of the secondary channels.

[0014] According to the present invention, a PDC coring drill bit for high-pressure drilling of reinjection wells is provided. The connecting component includes a plurality of connecting blocks, which are respectively fixedly connected to the bottom ends of a plurality of main housings. One end of a support plate is fixedly connected to both ends of each connecting block, and a connecting head is fixedly connected to the other end of the support plate. A plurality of mounting holes are provided on the crown of the drill bit. The main housings are adapted to the mounting holes. A mounting groove is fixedly connected circumferentially inside the mounting holes. A connecting hole is provided on the inner sidewall of each mounting groove, and the connecting head is adapted to the connecting hole.

[0015] According to the present invention, a PDC coring bit for high-pressure drilling of reinjection wells is provided, wherein a support rod is fixedly connected to the middle of the bottom end of the mounting groove, and one end of a top plate is hinged to both sides of the top end of the support rod. The top plate is in contact with the support plate, and a torsion spring is provided between the top plate and the support rod. The two ends of the torsion spring are fixedly connected to the support rod and the top plate, respectively.

[0016] According to the present invention, a PDC coring drill bit for high-pressure drilling of reinjection wells further includes a disassembly component. The disassembly component includes a rotating ring, which is rotatably connected to the drill bit crown and extends into the mounting hole. The rotating ring includes an inner rotating ring and an outer rotating ring, which are fixedly connected by a plurality of fixing plates. The mounting groove is located between the inner rotating ring and the outer rotating ring. Both the inner rotating ring and the outer rotating ring are provided with a pusher, which is used to push the connector out of the connecting hole.

[0017] According to the present invention, a high-pressure drilling PDC coring bit for reinjection wells is provided. The actuating component includes a plurality of actuating blocks. The plurality of actuating blocks are fixedly connected circumferentially to the outer wall of the inner rotating ring and the inner wall of the outer rotating ring. The side of the actuating block away from the outer wall of the inner rotating ring and the inner wall of the outer rotating ring is an arc-shaped surface, and the arc-shaped surface contacts the connector.

[0018] According to the present invention, a PDC coring bit for high-pressure drilling of reinjection wells includes a sealing element comprising a first sealing ring and a second sealing ring. The first sealing ring is fixedly connected to the outer wall of the support column. One end of the water delivery channel extends into the mounting hole. The second sealing ring is fixedly connected to the outer wall of the water delivery channel. The first sealing ring and the second sealing ring are in contact, and a sealing gasket is provided between the first sealing ring and the second sealing ring. The sealing gasket is fixedly connected to the first sealing ring.

[0019] According to the present invention, a PDC coring bit for high-pressure drilling of reinjection wells further includes a third sealing ring and a fourth sealing ring. The third sealing ring is fixedly connected to the first sealing ring, and the fourth sealing ring is fixedly connected to the second sealing ring. A first sealing ring is fixedly connected to the bottom end of the third sealing ring. The first sealing ring has a circular cross-section. A second sealing ring is fixedly connected to the top end of the fourth sealing ring. The second sealing ring has a C-shaped cross-section and is sleeved on the first sealing ring.

[0020] According to the present invention, a PDC coring bit for high-pressure drilling of reinjection wells is provided, wherein a third sealing ring is fixedly connected to the third sealing ring, the third sealing ring having a semi-circular cross-section, and sealing protrusions are fixedly connected to both sides of the inner and outer walls of the second sealing ring, the sealing protrusions contacting the outer wall of the first sealing ring and the inner wall of the third sealing ring.

[0021] Compared with the prior art, the present invention has the following advantages and technical effects:

[0022] This invention provides a PDC coring drill bit for high-pressure drilling in reinjection wells. During use, a gauging element addresses the problem of uneven wear on the outer gauging structure caused by high-pressure fluid erosion and hard rock friction, which can lead to wellbore deviation or diameter enlargement and reduced coring quality, thus ensuring drilling efficiency. A dual-spray mode with a nozzle ensures effective cuttings removal. A sealing element guarantees a tight seal, preventing high-pressure drilling fluid leakage into the drill bit bearing cavity, which could lead to lubrication failure and premature drill bit failure. A connecting element further ensures sealing stability and facilitates convenient nozzle installation and replacement. This application solves the problems of poor gauging stability, low sealing reliability, and low cuttings removal efficiency, improving drilling efficiency, extending drill bit lifespan, and increasing drilling efficiency. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 For the present invention Figure 1 Enlarged view of a portion of point A in the middle;

[0026] Figure 3 This is a schematic diagram of the internal structure of the mounting slot of the present invention;

[0027] Figure 4 This is a schematic diagram of the internal structure of the main housing of the present invention;

[0028] Figure 5 This is a schematic diagram of the internal structure of the support column of the present invention;

[0029] Figure 6 For the present invention Figure 5 Enlarged view of a section at point B in the middle;

[0030] Figure 7 This is a schematic diagram of the rotating ring structure of the present invention;

[0031] The components include: 1. Drill bit body; 2. Drill bit crown; 3. PDC tooth; 4. Water delivery channel; 5. Chip removal groove; 6. Carbide-based gauge protection tooth; 7. Diamond composite-layer gauge protection tooth; 8. Ceramic gauge protection strip; 9. Main shell; 10. Support column; 11. Main channel; 12. Secondary channel; 13. Pipeline; 14. High-pressure jet nozzle; 15. Atomizing nozzle; 16. Connecting block; 17. Support plate; 18. Connector; 19. Installation. 20. Hole; 21. Mounting slot; 22. Connecting hole; 23. Support rod; 24. Top plate; 25. Rotating inner ring; 26. Rotating outer ring; 27. Fixing plate; 28. Actuating block; 29. ​​First sealing ring; 30. Second sealing ring; 31. Sealing gasket; 32. Third sealing ring; 33. Fourth sealing ring; 34. First sealing ring; 35. Second sealing ring; 36. Third sealing ring; 37. Sealing protrusion; 38. Torsion spring. Detailed Implementation

[0032] 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.

[0033] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] Reference Figures 1-7 This invention provides a PDC coring drill bit for high-pressure drilling in reinjection wells, comprising a drill bit body 1 and a drill bit crown 2 fixedly connected to the top of the drill bit body 1, and further comprising:

[0035] The cutter wing assembly includes several PDC teeth 3 and several gauge protection components. The PDC teeth 3 are fixedly connected to the drill bit crown 2 in the circumferential direction, and the gauge protection components are set on the PDC teeth 3.

[0036] The spray assembly includes several nozzles and several water supply channels 4. Several chip removal grooves 5 are provided on the circumferential side of the drill bit crown 2. The chip removal grooves 5 are located between two adjacent PDC teeth 3 and are used to remove waste chips. The nozzles are installed at the top of the chip removal grooves 5. The water supply channels 4 are located inside the drill bit crown 2 and are connected to the nozzles.

[0037] The sealing connection assembly includes a seal and a connector. After the nozzle is limited and connected to the drill bit crown 2 through the connector, the nozzle is sealed and connected to the water delivery channel 4 through the seal.

[0038] In one embodiment of this application, during use, the gauging component addresses the problem that the outer edge gauging structure of the drill bit is prone to uneven wear due to high-pressure fluid erosion and hard rock friction, which can lead to wellbore deviation or wellbore enlargement and reduce coring quality, thus ensuring drilling performance. The nozzle forms a dual-spray mode to ensure chip removal performance, and the sealing component ensures sealing performance, preventing high-pressure drilling fluid leakage from entering the drill bit bearing cavity, which could lead to lubrication failure and premature drill bit failure. The connecting component further ensures the stability of the seal, while also enabling convenient installation and replacement of the nozzle.

[0039] As an optional implementation, the gauge protection component includes stepped gauge protection teeth, which are mounted on the PDC teeth 3. The stepped gauge protection teeth have a three-stage stepped structure, with the first stage being a cemented carbide matrix gauge protection tooth 6, the second stage being a diamond composite layer gauge protection tooth 7, and the third stage being a ceramic gauge protection strip 8.

[0040] In one embodiment of this application, the gauge protection component has a three-stage stepped structure. The first stage is a gauge protection tooth 6 with a cemented carbide substrate, made of WC-Co material with gradient cobalt content and a hardness ≥ HRA89. The second stage is a gauge protection tooth 7 with a diamond composite layer, 3-5mm thick, which is connected to the substrate by vacuum brazing. The third stage is a ceramic gauge protection strip 8, which is embedded in the drill bit crown through a wedge-shaped groove and has a TiC coating laser-clad on its surface. Self-sharpening guide grooves are formed between the steps. The groove width and included angle are optimized through fluid dynamics simulation. The groove width is 8-12mm and the included angle is 45°-60° to achieve cooling and slag removal of the gauge protection surface by high-pressure drilling fluid.

[0041] As an optional implementation, the nozzle includes a main housing 9, a support column 10 connected to the bottom of the main housing 9, a main channel 11 opened in the middle of the main housing 9, and several secondary channels 12 opened circumferentially along the upper part of the main housing 9. A pipe 13 is fixedly connected inside the support column 10. One end of the pipe 13 is connected to the water supply channel 4. The main channel 11 and several secondary channels 12 are respectively connected to the other end of the pipe 13. A high-pressure jet nozzle 14 is installed at the water outlet end of the main channel 11, and an atomizing nozzle 15 is installed at the water outlet end of the secondary channels 12.

[0042] In one embodiment of this application, the main housing 9 of the nozzle is provided with a plurality of circumferentially arranged atomizing nozzles 15, and a high-pressure jet nozzle 14 in the middle. The two form a dual-mode nozzle, with a central high-pressure jet plus circumferential atomization. The soil breaking and slag discharge are achieved by switching or cooperating between the two.

[0043] As an optional implementation, the connector includes several connecting blocks 16, which are fixedly connected to the bottom of several main housings 9. One end of a support plate 17 is fixedly connected to both ends of each connecting block 16, and a connector 18 is fixedly connected to the other end of the support plate 17. Several mounting holes 19 are provided on the drill bit crown 2, and the main housing 9 is adapted to the mounting holes 19. A mounting groove 20 is fixedly connected circumferentially inside the mounting hole 19. A connecting hole 21 is provided on the inner side wall of the mounting groove 20, and the connector 18 is adapted to the connecting hole 21.

[0044] In one embodiment of this application, the nozzle is installed conveniently and stably by manually pressing the nozzle to insert the connector 18 into the connector hole 21.

[0045] As an optional implementation, a support rod 22 is fixedly connected to the middle of the bottom end of the mounting groove 20. One end of a top plate 23 is hinged to both sides of the top of the support rod 22. The top plate 23 is in contact with the support plate 17. A torsion spring 37 is provided between the top plate 23 and the support rod 22. The two ends of the torsion spring 37 are fixedly connected to the support rod 22 and the top plate 23, respectively.

[0046] In one embodiment of this application, the support rod 22 is located at the middle of the bottom end of the mounting groove 20, and the two top plates 23, which are hinged at the top, are located between the two support plates 17. The top plates 23 are inclined. When the nozzle is pressed to install, the bottom end of the support plate 17 contacts the top plate 23. The support plate 17 is made of elastic metal. The top plate 23 presses the support plate 17 to make the connector 18 stably locked in the connection hole 21. Conversely, when the connector 18 is separated from the connection hole 21, the top plate 23 can lift the support plate 17. The contact surface between the two is preferably inclined, thereby realizing the automatic lifting of the nozzle and realizing disassembly.

[0047] As an optional implementation, a disassembly component is also included. The disassembly component includes a rotating ring, which is rotatably connected to the drill bit crown 2 and extends into the mounting hole 19. The rotating ring includes an inner rotating ring 24 and an outer rotating ring 25, which are fixedly connected by several fixing plates 26. The mounting groove 20 is located between the inner rotating ring 24 and the outer rotating ring 25. Both the inner rotating ring 24 and the outer rotating ring 25 are provided with a toggle element, which is used to push the connector 18 out of the connection hole 21.

[0048] In one embodiment of this application, the actuating member and the connecting hole 21 are offset in the initial state. When the rotating ring is manually rotated, the actuating member pushes the connector 18 out of the connecting hole 21, thereby realizing convenient disassembly of the nozzle.

[0049] As an optional implementation, the actuating component includes a plurality of actuating blocks 27, which are fixedly connected circumferentially to the outer wall of the inner rotating ring 24 and the inner wall of the outer rotating ring 25. The side of the actuating block 27 away from the outer wall of the inner rotating ring 24 and the inner wall of the outer rotating ring 25 is an arc-shaped surface, which contacts the connector 18.

[0050] In one embodiment of this application, the side of the actuating block 27 near the connector 18 is an arc-shaped surface. When the entire rotating ring is rotated, the actuating blocks 27 on the inner rotating ring 24 and the outer rotating ring 25 respectively contact the connectors 18 on both sides of the mounting groove 20. As the actuating blocks 27 move, they press the connectors 18 into the mounting groove 20 and eventually make contact with the mounting hole 19 for a limiting connection.

[0051] Specifically, the end of connector 18 has an arc-shaped structure to ensure stable disengagement between connector 18 and connector hole 21.

[0052] Specifically, threaded holes are provided on both the rotating outer ring 25 and the drill bit crown 2. By connecting the two threaded holes and screwing in bolts, the rotating outer ring 25 and the drill bit crown 2 are connected in a limiting manner. At this time, the nozzle can be pressed manually, and otherwise the nozzle will pop up, making it easy to install and replace.

[0053] As an optional implementation, the sealing element includes a first sealing ring 28 and a second sealing ring 29. The first sealing ring 28 is fixedly connected to the outer wall of the support column 10. One end of the water supply channel 4 extends into the mounting hole 19. The second sealing ring 29 is fixedly connected to the outer wall of the water supply channel 4. The first sealing ring 28 and the second sealing ring 29 are in contact, and a sealing washer 30 is provided between the first sealing ring 28 and the second sealing ring 29. The sealing washer 30 is fixedly connected to the first sealing ring 28.

[0054] In one embodiment of this application, after the nozzle is installed, the support column 10 extends into the water supply channel 4 and communicates with it. At this time, the first sealing ring 28 and the second sealing ring 29 come into contact, realizing the communication between the nozzle and the water supply channel 4, and the sealing gasket 30 ensures the seal between the first sealing ring 28 and the second sealing ring 29.

[0055] As an optional implementation, it also includes a third sealing ring 31 and a fourth sealing ring 32. The third sealing ring 31 is fixedly connected to the first sealing ring 28, and the fourth sealing ring 32 is fixedly connected to the second sealing ring 29. A first sealing ring 33 is fixedly connected to the bottom end of the third sealing ring 31. The first sealing ring 33 has a circular cross-section. A second sealing ring 34 is fixedly connected to the top end of the fourth sealing ring 32. The second sealing ring 34 has a C-shaped cross-section and is sleeved on the first sealing ring 33.

[0056] In one embodiment of this application, when the first sealing ring 28 contacts the second sealing ring 29, the first sealing ring 33 extends into the second sealing ring 34 to achieve the connection between the two. After the connection, its horizontality is consistent with the thickness of the sealing gasket 30 after compression, further ensuring the sealing effect. When the sealing performance of the sealing gasket 30 decreases, the first sealing ring 33 and the second sealing ring 34 after the connection are set to further ensure the sealing connection.

[0057] As an optional implementation, a third sealing ring 35 is also fixedly connected to the third sealing ring 31. The cross-section of the third sealing ring 35 is semi-circular. Sealing protrusions 36 are fixedly connected to both sides of the inner and outer walls of the second sealing ring 34. The sealing protrusions 36 are in contact with the outer wall of the first sealing ring 33 and the inner wall of the third sealing ring 35.

[0058] In one embodiment of this application, the third sealing ring 35 has a semi-circular cross-section and a gap exists between it and the first sealing ring 33. When the first sealing ring 33 is connected to the second sealing ring 34, both ends of the second sealing ring 34 extend into the gap between the third sealing ring 35 and the first sealing ring 33. At the same time, the C-shaped structure is opened, the inner sealing protrusion 36 contacts the first sealing ring 33, and the outer sealing protrusion 36 contacts the third sealing ring 35, thereby achieving multi-layer sealing and preventing liquid leakage.

[0059] Specifically, the second sealing ring 34 is made of elastic metal and can deform, and the cross-section of the sealing protrusion 36 is arc-shaped.

[0060] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0061] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A PDC coring drill bit for high-pressure drilling in reinjection wells, comprising a drill bit body (1) and a drill bit crown (2) fixedly connected to the top of the drill bit body (1), characterized in that, Also includes: The cutter blade assembly includes a plurality of PDC teeth (3) and a plurality of gauge protection components. The plurality of PDC teeth (3) are fixedly connected to the crown (2) of the drill bit in the circumferential direction, and the gauge protection components are disposed on the PDC teeth (3). The spray assembly includes several nozzles and several water supply channels (4). Several chip removal grooves (5) are provided on the circumferential side of the drill bit crown (2). The chip removal grooves (5) are located between two adjacent PDC teeth (3) and are used to remove waste chips. The nozzles are installed at the top of the chip removal grooves (5). The water supply channels (4) are located in the drill bit crown (2) and communicate with the nozzles. The sealing connection assembly includes a seal and a connector. After the nozzle is limited to the drill bit crown (2) through the connector, the nozzle is sealed to the water supply channel (4) through the seal. The gauge protection component includes stepped gauge protection teeth, which are installed on the PDC teeth (3). The stepped gauge protection teeth have a three-level stepped structure. The first level is a cemented carbide matrix gauge protection tooth (6), the second level is a diamond composite layer gauge protection tooth (7), which is connected to the matrix by vacuum brazing, and the third level is a ceramic gauge protection strip (8), which is embedded in the drill bit crown through a wedge groove. The nozzle includes a main housing (9), a support column (10) connected to the bottom of the main housing (9), a main channel (11) opened in the middle of the main housing (9), and several secondary channels (12) opened along the circumferential direction on the main housing (9). A pipe (13) is fixedly connected inside the support column (10). One end of the pipe (13) is connected to the water supply channel (4). The main channel (11) and several secondary channels (12) are respectively connected to the other end of the pipe (13). A high-pressure jet nozzle (14) is installed at the water outlet end of the main channel (11), and an atomizing nozzle (15) is installed at the water outlet end of the secondary channel (12).

2. The high pressure drilling PDC core bit for recharge well according to claim 1, characterized in that: The connector includes several connecting blocks (16), which are fixedly connected to the bottom of several main housings (9). Each connecting block (16) has a support plate (17) fixedly connected to one end at both ends. The other end of the support plate (17) is fixedly connected to a connector (18). The drill bit crown (2) has several mounting holes (19). The main housing (9) is adapted to the mounting holes (19). The mounting holes (19) are fixedly connected to the mounting grooves (20) along the circumferential direction. Each mounting groove (20) has a connecting hole (21) on its inner sidewall. The connector (18) is adapted to the connecting hole (21).

3. The high pressure PDC core bit for recharging well according to claim 2, characterized in that: A support rod (22) is fixedly connected to the middle of the bottom end of the mounting groove (20). One end of a top plate (23) is hinged to both sides of the top of the support rod (22). The top plate (23) is in contact with the support plate (17). A torsion spring (37) is provided between the top plate (23) and the support rod (22). The two ends of the torsion spring (37) are fixedly connected to the support rod (22) and the top plate (23) respectively.

4. The high pressure PDC core bit for recharging well according to claim 3, characterized in that: It also includes a disassembly component, which includes a rotating ring rotatably connected to the drill bit crown (2) and extending into the mounting hole (19). The rotating ring includes an inner rotating ring (24) and an outer rotating ring (25). The inner rotating ring (24) and the outer rotating ring (25) are fixedly connected by several fixing plates (26). The mounting groove (20) is located between the inner rotating ring (24) and the outer rotating ring (25). Both the inner rotating ring (24) and the outer rotating ring (25) are provided with a toggle element, which is used to push the connector (18) out from the connection hole (21).

5. A PDC coring bit for high-pressure drilling in reinjection wells according to claim 4, characterized in that: The actuating component includes a plurality of actuating blocks (27), which are fixedly connected circumferentially to the outer wall of the inner rotating ring (24) and the inner wall of the outer rotating ring (25). The side of the actuating block (27) away from the outer wall of the inner rotating ring (24) and the inner wall of the outer rotating ring (25) is an arc-shaped surface, which contacts the connector (18).

6. The PDC coring bit for high-pressure drilling in reinjection wells according to claim 2, characterized in that: The sealing element includes a first sealing ring (28) and a second sealing ring (29). The first sealing ring (28) is fixedly connected to the outer wall of the support column (10). One end of the water supply channel (4) extends into the mounting hole (19). The second sealing ring (29) is fixedly connected to the outer wall of the water supply channel (4). The first sealing ring (28) and the second sealing ring (29) are in contact. A sealing gasket (30) is provided between the first sealing ring (28) and the second sealing ring (29). The sealing gasket (30) is fixedly connected to the first sealing ring (28).

7. A high pressure drilling PDC core bit for a recharging well according to claim 6, characterized in that: It also includes a third sealing ring (31) and a fourth sealing ring (32). The third sealing ring (31) is fixedly connected to the first sealing ring (28), and the fourth sealing ring (32) is fixedly connected to the second sealing ring (29). The bottom end of the third sealing ring (31) is fixedly connected to a first sealing ring (33), which has a circular cross-section. The top end of the fourth sealing ring (32) is fixedly connected to a second sealing ring (34), which has a C-shaped cross-section and is fitted onto the first sealing ring (33).

8. The high pressure drilling PDC core bit for recharge well according to claim 7, characterized in that: A third sealing ring (35) is also fixedly connected to the third sealing ring (31). The cross-section of the third sealing ring (35) is semi-circular. Sealing protrusions (36) are fixedly connected to both sides of the inner and outer walls of the second sealing ring (34). The sealing protrusions (36) are in contact with the outer wall of the first sealing ring (33) and the inner wall of the third sealing ring (35).

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