Self-cleaning geological drilling system suitable for complex soil and rock stratum

Abstract

The application relates to the technical field of drilling systems, in particular to a self-cleaning geological drilling system suitable for complex soil and rock strata. The technical scheme comprises a drill bit, a water hole, a connecting body and a anti-blocking flow distribution system. The anti-blocking flow distribution system comprises a main pipe, a shunt pipe, a water flow detection assembly and a valve group structure. When drilling normally, drilling fluid is shunted to each water hole through the main pipe. When a certain water hole is blocked, the water flow in the corresponding shunt pipe slows down, the water flow detection assembly acts, and the valve group structure is closed to the remaining shunt pipes through hydraulic linkage, so that the pump pressure is concentrated to the blocked water hole for back flushing and dredging, and the system is automatically reset after dredging. The system is purely mechanically driven throughout the process, does not require power, is suitable for the harsh downhole environment, can dredge without stopping drilling, and improves the drilling efficiency and safety.

Description

Technical Field

[0001] This invention relates to the field of drilling system technology, and in particular to a self-cleaning geological drilling system suitable for complex soil and rock formations. Background Technology

[0002] Complex soil and rock formations often involve alternating layers of soft and hard rock, with clay and fractured rock layers interbedded. During drilling, the drill bit's water holes are easily blocked by rock cuttings, mud, and backflowing solid particles. Once the water holes are blocked, it will lead to local cooling failure of the drill bit, poor cuttings removal, and further aggravate mud buildup and wear. In severe cases, it can cause pump stalling, forcing the drill bit to be pulled up for cleaning and reducing drilling efficiency.

[0003] When a water hole is blocked, it cannot automatically identify and cut off the flow path of the other normal water holes. The drilling fluid still flows from the other water holes, which makes it impossible for the internal pressure of the blocked water hole to rise effectively. It is difficult to form a strong enough reverse impact flow to break the blockage. On the other hand, the solution that relies on electrical control or ground intervention has problems such as difficulty in wiring, slow response and poor reliability in the high temperature, high pressure and strong vibration environment downhole. Summary of the Invention

[0004] The purpose of this application is to address the problems existing in the background technology by proposing a self-cleaning geological drilling system suitable for complex soil and rock formations. When a single water hole is blocked, the system automatically senses changes in water flow through a purely mechanical structure and closes the remaining water holes in conjunction with it. All drilling fluid pressure is concentrated on the blocked water hole for a powerful backflushing, and the hole is automatically reset after being cleared. This system achieves self-cleaning and unblocking of the well without the need for electricity or drilling rig lifting.

[0005] The technical solution of this application: A self-cleaning geological drilling system suitable for complex soil and rock strata, comprising a drill bit, multiple water holes provided on the drill bit, and a connector installed on the drill bit, and further comprising:

[0006] An anti-clogging flow distribution system installed inside the connector body is used to cut off the flow in the remaining water holes when one of the water holes is blocked. The anti-clogging flow distribution system includes:

[0007] A main pipe fixedly installed inside the connector, and multiple branch pipes fixedly installed on the main pipe, wherein each branch pipe corresponds to a water hole and is connected to the main pipe through a connecting pipe;

[0008] The bottom of the diversion pipe is provided with a water flow detection component. A valve group structure for controlling the blocking of the diversion pipe is installed on the diversion pipe and above the water flow detection component. The valve group structure is hydraulically connected to the main pipe. The water flow detection component controls the blocking state of the corresponding valve group structure and the transmission path of the main pipe.

[0009] A hydraulic on / off valve installed inside the main pipe controls the sealing state of the main pipe, and the water flow detection component controls the opening and closing state of the hydraulic on / off valve.

[0010] Optionally, the water flow detection assembly includes a detection plate rotatably installed inside the diversion pipe, a plurality of flow holes provided on the detection plate, and an elastic pull rope fixedly installed between the detection plate and the diversion pipe.

[0011] Optionally, the valve assembly structure includes a valve body fixedly installed on the diversion pipe, a valve plate slidably installed inside the valve body, and a pressure cylinder fixedly installed inside the connecting body. A sealing block is sealed and slidably installed inside the pressure cylinder, and a push rod is fixedly installed on the sealing block. The push rod is fixedly connected to the valve plate. A spring is provided between the sealing block and the pressure cylinder. The pressure cylinder is connected to the bottom of the main pipe through a pressure transmission pipe.

[0012] Optionally, a first hydraulic cylinder is rotatably mounted on the diverter pipe, a first piston is sealed and slidably mounted inside the first hydraulic cylinder, a first push rod is fixedly mounted on the first piston, and the first push rod is rotatably connected to the detection plate.

[0013] Optionally, the water flow detection component controls the blocking state of the corresponding valve group structure and the main pipe transmission path through a blocking valve group, wherein the blocking valve group includes:

[0014] A valve seat is fixedly installed on a pressure transmission pipe, a sealing plate is slidably installed inside the valve seat, a second hydraulic cylinder is fixedly installed on the sealing plate, a second piston is slidably and sealingly connected inside the second hydraulic cylinder, and a second push rod is fixedly installed on the second piston. The second piston is fixedly connected to the sealing plate. The first hydraulic cylinder and the second hydraulic cylinder are connected through a first infusion pipe. The first hydraulic cylinder, the second hydraulic cylinder and the first infusion pipe are filled with hydraulic medium.

[0015] Optionally, the hydraulic on / off valve includes an isolation plate fixedly installed inside the main pipe, a pressure transmission hole provided on the isolation plate, and a U-shaped tube fixedly installed on the pressure transmission hole. One end of the U-shaped tube faces upward and is slidably fitted with a sealing cover. The sealing cover is provided with multiple pressure relief holes, and a counterweight is fixedly installed on the sealing cover.

[0016] Optionally, multiple third hydraulic cylinders are fixedly installed inside the main pipe. A third piston is slidably installed inside each third hydraulic cylinder, and a third push rod is fixedly installed on the third piston. The third push rod is fixedly connected to the sealing cover. The first hydraulic cylinder and the third hydraulic cylinder correspond one-to-one and are connected through a second infusion pipe.

[0017] Optionally, a pressure relief pipe is fixedly installed on the main pipe, with its two ends located below the hydraulic on / off valve and above the valve assembly structure, respectively. A one-way valve is fixedly installed on the pressure relief pipe to control the unidirectional flow of liquid in the main pipe to the branch pipe.

[0018] Optionally, a mesh-like stop is slidably mounted on one side of the pressure-transmitting pipe and located on the valve seat to limit the upward path of the sealing plate, and a tension spring is installed between the stop and the pressure-transmitting pipe.

[0019] Optionally, the connection between the diverter pipe and the main pipe is located above the hydraulic on / off valve, and damping is provided between the U-shaped pipe and the sealing cover.

[0020] In summary, this application includes at least one of the following beneficial technical effects:

[0021] By setting up an anti-clogging flow distribution system, the system uses a water flow detection component to sense the water flow status in each branch pipe in real time. When a water hole is blocked, causing the flow rate in the corresponding branch pipe to slow down, the valve group structure of the remaining branch pipes is automatically closed by pure mechanical hydraulic linkage. This prevents the drilling fluid from continuing to flow from the normal water hole, thereby concentrating all pump pressure and flow to the blocked water hole, forming a strong reverse impact flow that quickly clears the blockage. The entire process requires no electricity, sensors, or ground intervention and is driven entirely by the drilling fluid's own pressure. It is adapted to the high temperature and high pressure environment downhole and can effectively avoid drill bit mud packing, cooling failure, pump stalling, and frequent drill lifting caused by water hole blockage. It significantly improves drilling efficiency, drill bit life, and operational safety in complex soil and rock formations, while reducing construction costs. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the drill bit structure;

[0023] Figure 2 This is a schematic diagram of the internal structure of the connector;

[0024] Figure 3 Schematic diagram of the drilling system Figure 1 ;

[0025] Figure 4 Schematic diagram of the drilling system Figure 2 ;

[0026] Figure 5 for Figure 4 A magnified view of a section at point A in the middle;

[0027] Figure 6 for Figure 5 A magnified view of a section at point B in the middle;

[0028] Figure 7 for Figure 4 A magnified view of a section at point C;

[0029] Figure 8 This is a schematic diagram of the block's structure;

[0030] Figure 9 This is a schematic diagram of the hydraulic transmission relationship.

[0031] Reference numerals: 1. Drill bit; 11. Water hole; 2. Connector;

[0032] 3. Anti-blockage flow distribution system; 31. Main pipe; 32. Branch pipe; 33. Connecting pipe;

[0033] 34. Water flow detection component; 341. Detection plate; 342. Flow hole; 343. Pull rope; 344. First hydraulic cylinder; 345. First piston; 346. First push rod;

[0034] 35. Valve assembly structure; 351. Valve body; 352. Valve plate; 353. Pressure cylinder; 354. Sealing block; 355. Push rod; 356. Spring; 357. Pressure transmission pipe;

[0035] 36. Hydraulic on / off valve; 361. Isolation plate; 362. Pressure transmission hole; 363. U-tube; 364. Sealing cover; 365. Pressure relief hole; 366. Counterweight; 367. Third hydraulic cylinder; 368. Third piston; 369. Third push rod;

[0036] 37. Blocking valve assembly; 371. Valve seat; 372. Sealing plate; 373. Second hydraulic cylinder; 374. Second piston; 375. Second push rod; 376. Stop block; 377. Tension spring;

[0037] 381. First infusion tube; 382. Second infusion tube;

[0038] 391. Pressure relief pipe; 392. Check valve. Detailed Implementation

[0039] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0040] Example

[0041] like Figures 1 to 2 As shown, this application proposes a self-cleaning geological drilling system suitable for complex soil and rock formations, including a drill bit 1 and multiple water holes 11 provided on the drill bit 1. The water holes 11 provide a jetting channel for drilling fluid from the inside of the drill bit to the bottom of the well. The water holes 11 are easily blocked by rock cuttings, mud, or solid particles in the backflow of drilling fluid. When the water holes 11 are blocked, the drilling fluid at that point cannot be jetted out normally, which will lead to local cooling failure of the drill bit, poor cuttings removal, and further aggravate mud and wear.

[0042] like Figures 3 to 9As shown, this embodiment also includes a connector 2 installed on the drill bit 1 and an anti-clogging flow distribution system 3 installed inside the connector 2. This system is used to cut off the flow in the remaining water holes 11 when one of the water holes 11 is blocked. When a water hole 11 is blocked, the system automatically cuts off the flow channels of the remaining normal water holes 11, concentrating all the drilling fluid flow and pressure that were originally distributed to each water hole 11 onto the blocked water hole 11. This causes the internal pressure to increase sharply, forming a powerful reverse impact flow that pushes the blockage outward from the inside of the water hole 11, achieving rapid backflushing and unblocking.

[0043] Furthermore, in this embodiment, the anti-clogging flow distribution system 3 includes a main pipe 31 fixedly installed inside the connector 2 and multiple branch pipes 32 fixedly installed on the main pipe 31. Each branch pipe 32 corresponds to a water hole 11 and is connected to it through a connecting pipe 33. The pumping device at the ground end inputs high-pressure drilling fluid into the main pipe 31. The main pipe 31 serves as the main channel to distribute the drilling fluid to each branch pipe 32, and then it is transported to the corresponding water hole 11 through the connecting pipe 33, and finally sprayed out from the water hole 11 to the bottom of the well.

[0044] The bottom of the diversion pipe 32 is equipped with a water flow detection component 34. A valve group structure 35 for controlling the blockage of the diversion pipe 32 is installed on the diversion pipe 32 and above the water flow detection component 34. The valve group structure 35 is hydraulically connected to the main pipe 31. The water flow detection component 34 senses the flow rate of drilling fluid in the diversion pipe 32 in real time. When it detects that the liquid flow rate inside one of the diversion pipes 32 slows down or even stops, it indicates that the corresponding water hole 11 may be blocked. The signal is transmitted to the valve group structure 35 on the other diversion pipes 32 through hydraulic transmission, so that it can act and close the flow passage of the other diversion pipes 32.

[0045] Furthermore, the water flow detection component 34 includes a detection plate 341 rotatably installed inside the diversion pipe 32, multiple flow holes 342 provided on the detection plate 341, and an elastic pull rope 343 fixedly installed between the detection plate 341 and the diversion pipe 32. During normal flow, the drilling fluid flows downward through the multiple flow holes 342 on the detection plate 341. The flow of water will exert a downward pressure on the detection plate 341, causing the detection plate 341 to overcome the elastic tension of the pull rope 343 and rotate downward. When the water flow slows down, the downward pressure decreases, and the detection plate 341 rotates upward under the elastic restoring force of the pull rope 343. The rotation angle of the detection plate 341 directly reflects the speed of the water flow in the diversion pipe 32, and thus can determine whether the corresponding water hole 11 is blocked.

[0046] like Figures 3 to 9As shown, in this embodiment, the valve assembly structure 35 includes a valve body 351 fixedly installed on the diversion pipe 32, a valve plate 352 slidably installed inside the valve body 351, and a pressure cylinder 353 fixedly installed inside the connector 2. A sealing block 354 is sealed and slidably installed inside the pressure cylinder 353, and a push rod 355 is fixedly installed on the sealing block 354. The push rod 355 is fixedly connected to the valve plate 352, and a spring is provided between the sealing block 354 and the pressure cylinder 353. 356. The pressure cylinder 353 is connected to the bottom of the main pipe 31 through the pressure transmission pipe 357. When the hydraulic pressure at the bottom of the main pipe 31 increases, the increased hydraulic pressure will be transmitted to the inside of the pressure cylinder 353 through the pressure transmission pipe 357, pushing the sealing block 354 to move against the elastic force of the spring 356. The sealing block 354 drives the valve plate 352 to slide in the valve body 351 through the push rod 355, thereby blocking the diversion pipe 32 and cutting off the flow passage of the diversion pipe 32.

[0047] To prevent the blocked diversion pipe 32 from being blocked by the valve assembly structure 35, thus preventing the transmission of hydraulic pressure, the water flow detection component 34 controls the blocking status of the corresponding valve assembly structure 35 and the transmission path of the main pipe 31. Specifically, a first hydraulic cylinder 344 is rotatably mounted on the diversion pipe 32. A first piston 345 is sealed and slidably mounted inside the first hydraulic cylinder 344. A first push rod 346 is fixedly mounted on the first piston 345. The first push rod 346 is rotatably connected to the detection plate 341. When the detection plate 341 flips due to changes in water flow, it will drive the first push rod 346 to move, thereby driving the first piston 345 to slide inside the first hydraulic cylinder 344, thus driving the hydraulic medium inside the first hydraulic cylinder 344.

[0048] Furthermore, the water flow detection component 34 controls the blocking state of the corresponding valve assembly structure 35 and the transmission path of the main pipe 31 through the blocking valve assembly 37. The blocking valve assembly 37 includes a valve seat 371 fixedly installed on the pressure transmission pipe 357, a sealing plate 372 slidably installed inside the valve seat 371, a second hydraulic cylinder 373 fixedly installed on the sealing plate 372, a second piston 374 slidably and sealingly connected inside the second hydraulic cylinder 373, and a second push rod 375 fixedly installed on the second piston 374. The second piston 374 is fixedly connected to the sealing plate 372. The first hydraulic cylinder 374 and the second hydraulic cylinder 375 are connected to the sealing plate 372. The cylinders 373 are connected by a first infusion pipe 381. The first hydraulic cylinder 344, the second hydraulic cylinder 373 and the first infusion pipe 381 are filled with hydraulic medium. Through the delivery of the first infusion pipe 381, the hydraulic changes inside the first hydraulic cylinder 344 can be transmitted to the inside of the second hydraulic cylinder 373. When the detection plate 341 rotates, the first piston 345 drives the hydraulic medium to flow into the second hydraulic cylinder 373 through the first infusion pipe 381, pushing the second piston 374 to move. The second piston 374 drives the sealing plate 372 to slide in the valve seat 371, thereby blocking or opening the pressure transmission pipe 357.

[0049] Specifically, when the detection plate 341 rotates down due to normal water flow in a certain branch pipe 32, the sealing plate 372 blocks the pressure transmission pipe 357, preventing the hydraulic pressure inside the main pipe 31 from being transmitted to the pressure cylinder 353 corresponding to the branch pipe 32, thereby avoiding the normal branch pipe 32 from being accidentally blocked.

[0050] It is worth noting that when the remaining unblocked diversion pipes 32 are actively blocked by the valve assembly structure 35, the corresponding detection plate 341 will also flip due to the disappearance of water flow inside, thereby actuating the blocking valve assembly 37, preventing the remaining diversion pipes 32 from being blocked. To solve this problem, a mesh baffle 376 is slidably installed on the pressure transmission pipe 357 and on one side of the valve seat 371 to limit the upward path of the sealing plate 372. The baffle 376 and the pressure transmission pipe 357 are positioned close together. Installed with tension spring 377, when the internal pressure at the bottom of the main pipe 31 increases, the liquid will flow into the pressure cylinder 353 through the pressure transmission pipe 357. At this time, the liquid will exert a pushing force on the stop block 376, and cause the stop block 376 to overcome the tension of the tension spring 377 and move above the sealing plate 372. Even if the subsequent detection plate 341 flips due to the disappearance of water flow and tries to drive the sealing plate 372 to rise, the sealing plate 372 will be restricted to the bottom by the stop block 376 and cannot rise to block the pressure transmission pipe 357.

[0051] like Figures 3 to 9 As shown, this embodiment also includes a hydraulic on / off valve 36 installed inside the main pipe 31. The connection between the branch pipe 32 and the main pipe 31 is located above the hydraulic on / off valve 36. The hydraulic on / off valve 36 controls the blocking state of the main pipe 31, and the water flow detection component 34 controls the opening and closing state of the hydraulic on / off valve 36. The hydraulic on / off valve 36 divides the interior of the main pipe 31 into upper and lower parts and controls the connection state of these two parts. The upper part always bears the hydraulic pressure delivered by the ground pumping device. When the hydraulic on / off valve 36 is closed, the upper and lower parts are isolated, and the lower part does not bear the ground pumping pressure. When it is necessary to actively block the other branch pipes 32, the water flow detection component 34 controls the hydraulic on / off valve 36 to open, so that the upper and lower parts of the main pipe 31 are connected, and the high-pressure liquid pumped by the ground enters the lower part, actively pushing the valve group structure 35 to block through hydraulic action.

[0052] Furthermore, the hydraulic on / off valve 36 includes an isolation plate 361 fixedly installed inside the main pipe 31, a pressure transmission hole 362 provided on the isolation plate 361, and a U-shaped tube 363 fixedly installed on the pressure transmission hole 362. One end of the U-shaped tube 363 faces upward and is slidably fitted with a sealing cover 364. The sealing cover 364 is provided with multiple pressure relief holes 365, and a counterweight 366 is fixedly installed on the sealing cover 364. The sealing cover 364 always bears the upward hydraulic pressure, and at the same time also bears the downward gravity of itself and the counterweight 366, and the gravity is slightly greater than that of the main pipe 364. The upward hydraulic pressure causes the sealing cover 364 to remain in a lowered position when not subjected to additional thrust, sealing the upper end of the U-shaped tube 363 and isolating the upper and lower parts of the main pipe 31. When the sealing cover 364 is subjected to additional upward thrust, it can rise, allowing the pressure relief hole 365 to connect with the upper part of the U-shaped tube 363. The upper and lower parts of the main pipe 31 are then connected through the U-shaped tube 363 and the pressure relief hole 365, allowing the high-pressure liquid in the upper part to enter the lower part. At this time, the hydraulic pressure below the main pipe 31 increases, which can close the valve plate 352 that needs to be closed.

[0053] Furthermore, multiple third hydraulic cylinders 367 are fixedly installed inside the main pipe 31. A third piston 368 is slidably installed inside each third hydraulic cylinder 367, and a third push rod 369 is fixedly installed on the third piston 368. The third push rod 369 is fixedly connected to the sealing cover 364. The first hydraulic cylinder 344 and the third hydraulic cylinder 367 correspond one-to-one and are connected through a second infusion pipe 382. The hydraulic pressure inside the first hydraulic cylinder 344 can be applied to the inside of the third hydraulic cylinder 367 through the second infusion pipe 382. When the detection plate 341 changes due to water flow... During rotation, the hydraulic medium in the first hydraulic cylinder 344 enters the third hydraulic cylinder 367 through the second inlet pipe 382, ​​pushing the third piston 368 to slide. The third piston 368 drives the sealing cover 364 to rise through the third push rod 369. In this way, the mechanical action of the water flow detection component 34 ultimately controls the opening and closing state of the hydraulic on-off valve 36 through hydraulic transmission. The one-to-one correspondence between the first hydraulic cylinder 344 and the third hydraulic cylinder 367 allows the water flow detection component 34 of each diversion pipe 32 to independently control the opening of the hydraulic on-off valve 36.

[0054] The U-shaped tube 363 and the sealing cover 364 are equipped with damping. The damping can reduce the descent speed of the sealing cover 364, so that the sealing cover 364 can descend slowly after rising and opening, instead of falling back quickly. This can ensure that the opening time of the hydraulic on-off valve 36 is long enough, so that the high-pressure liquid in the upper part of the main pipe 31 has enough time to enter the lower part and be transmitted to each pressure cylinder 353 through the pressure transmission pipe 357, pushing the valve plate 352 to complete the sealing of the diversion pipe 32.

[0055] like Figures 3 to 4As shown, in this embodiment, a pressure relief pipe 391 is fixedly installed on the main pipe 31. The two ends of the pressure relief pipe 391 are located below the hydraulic on / off valve 36 and above the valve group structure 35, respectively. A one-way valve 392 is fixedly installed on the pressure relief pipe 391 to control the unidirectional flow of liquid in the main pipe 31 to the branch pipe 32. When the blockage is cleared, the branch pipe 32 resumes flow. The high-velocity liquid inside the branch pipe 32 will generate suction force on the inside of the pressure relief pipe 391, reducing the pressure inside the pressure relief pipe 391. At this time, the one-way valve 392 allows the liquid in the main pipe 31 to flow unidirectionally through the pressure relief pipe 391 to the branch pipe 32, thereby reducing the pressure at the bottom of the main pipe 31 and enabling the system to reset quickly.

[0056] Working principle: During normal drilling, the surface pumping device inputs high-pressure drilling fluid into the main pipe 31, which is then transported to each water hole 11 through the branch pipe 32 and the connecting pipe 33. At this time, the detection plate 341 in each branch pipe 32 rotates downward under the action of the water flow pressure, and the valve plate 352 remains open, allowing each water hole 11 to flow normally.

[0057] When one of the water holes 11 is blocked, the water flow in the corresponding diversion pipe 32 slows down. The detection plate 341 rotates upward under the elastic restoring force of the pull rope 343, which drives the first piston 345 to move in the opposite direction. Through the first infusion pipe 381, the second piston 374 in the second hydraulic cylinder 373 drives the sealing plate 372 to rise, which closes the corresponding pressure transmission pipe 357. The hydraulic pressure at the bottom of the main pipe 31 can no longer enter the interior of the pressure cylinder 353, but can enter the interior of the other diversion pipes 32 that need to be blocked.

[0058] Meanwhile, the rotation of the detection plate 341 also transmits hydraulic pressure to the third hydraulic cylinder 367 through the second fluid inlet pipe 382, ​​pushing the third piston 368 and the third push rod 369 to drive the sealing cover 364 to rise, so that the pressure relief hole 365 is connected to the U-shaped pipe 363, and the upper and lower parts of the main pipe 31 are connected. The high-pressure liquid pumped from the ground enters the lower part of the main pipe 31, increasing the bottom hydraulic pressure. This hydraulic pressure enters the pressure cylinder 353, which can push the valve plate 352 to close, thereby closing the other branch pipes 32. After the other branch pipes 32 are closed, the pressure and flow of all drilling fluid are concentrated and directed to the blocked branch pipes 32, causing the internal pressure to increase sharply, forming a strong reverse impact flow, which pushes the blockage from the inside of the water hole 11 outward.

[0059] Once the blockage is cleared, the flow channel 32 resumes flow, the detection plate 341 rotates downwards again, the sealing plate 372 re-seals the pressure transmission pipe 357, the hydraulic pressure in the pressure cylinder 353 disappears, the spring 356 pushes the sealing block 354 and the valve plate 352 to reset, and the remaining flow channels 32 are restored to unobstructed flow.

[0060] The above specific embodiments are merely several optional embodiments of the present invention. Based on the technical solutions of the present invention and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A self-cleaning geological drilling system suitable for complex soil and rock formations, comprising a drill bit (1), a plurality of water holes (11) disposed on the drill bit (1), and a connector (2) mounted on the drill bit (1), characterized in that, Also includes: An anti-clogging flow distribution system (3) installed inside the connector (2) is used to cut off the flow in the remaining water holes (11) when one of the water holes (11) is blocked. The anti-clogging flow distribution system (3) includes: A main pipe (31) is fixedly installed inside the connector (2), and multiple branch pipes (32) are fixedly installed on the main pipe (31). The branch pipes (32) correspond one-to-one with the water holes (11) and are connected through the connector (33). The bottom of the diversion pipe (32) is provided with a water flow detection component (34). A valve group structure (35) for controlling the blocking of the diversion pipe (32) is installed on the diversion pipe (32) and above the water flow detection component (34). The valve group structure (35) is hydraulically connected to the main pipe (31). The water flow detection component (34) controls the blocking state of the transmission path between the corresponding valve group structure (35) and the main pipe (31). The hydraulic valve (36) installed inside the main pipe (31) controls the blocking state of the main pipe (31), and the water flow detection component (34) controls the opening and closing state of the hydraulic valve (36).

2. The self-cleaning geological drilling system suitable for complex soil and rock formations according to claim 1, characterized in that, The water flow detection assembly (34) includes a detection plate (341) rotatably installed in the diversion pipe (32), a plurality of flow holes (342) provided on the detection plate (341), and an elastic pull rope (343) fixedly installed between the detection plate (341) and the diversion pipe (32).

3. The self-cleaning geological drilling system suitable for complex soil and rock strata according to claim 2, characterized in that, The valve assembly structure (35) includes a valve body (351) fixedly installed on the diversion pipe (32), a valve plate (352) slidably installed inside the valve body (351), and a pressure cylinder (353) fixedly installed inside the connector (2). The pressure cylinder (353) is sealed and slidably installed with a sealing block (354) and a push rod (355) fixedly installed on the sealing block (354). The push rod (355) is fixedly connected to the valve plate (352). A spring (356) is provided between the sealing block (354) and the pressure cylinder (353). The pressure cylinder (353) is connected to the bottom of the main pipe (31) through a pressure transmission pipe (357).

4. The self-cleaning geological drilling system suitable for complex soil and rock strata according to claim 3, characterized in that, A first hydraulic cylinder (344) is rotatably mounted on the diverter pipe (32). A first piston (345) is sealed and slidably mounted inside the first hydraulic cylinder (344). A first push rod (346) is fixedly mounted on the first piston (345). The first push rod (346) is rotatably connected to the detection plate (341).

5. A self-cleaning geological drilling system suitable for complex soil and rock formations according to claim 4, characterized in that, The water flow detection component (34) controls the blocking state of the corresponding valve group structure (35) and the transmission path of the main pipe (31) through the blocking valve group (37). The blocking valve group (37) includes: A valve seat (371) is fixedly installed on a pressure transmission pipe (357), a sealing plate (372) is slidably installed inside the valve seat (371), a second hydraulic cylinder (373) is fixedly installed on the sealing plate (372), a second piston (374) is slidably and sealedly connected inside the second hydraulic cylinder (373), and a second push rod (375) is fixedly installed on the second piston (374). The second piston (374) is fixedly connected to the sealing plate (372). The first hydraulic cylinder (344) and the second hydraulic cylinder (373) are connected through a first infusion pipe (381). The first hydraulic cylinder (344), the second hydraulic cylinder (373) and the first infusion pipe (381) are filled with hydraulic medium.

6. A self-cleaning geological drilling system suitable for complex soil and rock formations according to claim 5, characterized in that, The hydraulic on / off valve (36) includes an isolation plate (361) fixedly installed inside the main pipe (31), a pressure transmission hole (362) provided on the isolation plate (361), and a U-shaped tube (363) fixedly installed on the pressure transmission hole (362). One end of the U-shaped tube (363) faces upward and is slidably fitted with a sealing cover (364). The sealing cover (364) is provided with multiple pressure relief holes (365), and a counterweight (366) is fixedly installed on the sealing cover (364).

7. A self-cleaning geological drilling system suitable for complex soil and rock formations according to claim 6, characterized in that, Multiple third hydraulic cylinders (367) are fixedly installed inside the main pipe (31). A third piston (368) is sealed and slidably installed inside the third hydraulic cylinder (367). A third push rod (369) is fixedly installed on the third piston (368). The third push rod (369) is fixedly connected to the sealing cover (364). The first hydraulic cylinder (344) and the third hydraulic cylinder (367) correspond one-to-one and are connected through the second infusion pipe (382).

8. A self-cleaning geological drilling system suitable for complex soil and rock formations according to claim 7, characterized in that, A pressure relief pipe (391) is fixedly installed on the main pipe (31). The two ends of the pressure relief pipe (391) are located below the hydraulic on / off valve (36) and above the valve group structure (35), respectively. A one-way valve (392) is fixedly installed on the pressure relief pipe (391) to control the liquid in the main pipe (31) to flow unidirectionally to the branch pipe (32).

9. A self-cleaning geological drilling system suitable for complex soil and rock formations according to claim 8, characterized in that, The pressure transmission tube (357) is slidably mounted with a mesh block (376) on one side of the valve seat (371) to restrict the upward path of the sealing plate (372). A tension spring (377) is installed between the block (376) and the pressure transmission tube (357).

10. A self-cleaning geological drilling system suitable for complex soil and rock formations according to claim 9, characterized in that, The connection between the diverter pipe (32) and the main pipe (31) is located above the hydraulic on / off valve (36), and a damping is provided between the U-shaped pipe (363) and the sealing cover (364).

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