A downhole long distance ultra-deep drilling double-power deslagging system and method

Abstract

A downhole long distance ultra-deep drilling double power slag discharge system and method, the system: the customized drill rod axis has a water injection channel, two vertical grooves are arranged on both sides of the rod body, and the first end is connected with a power head on a drilling machine; a drill bit is connected to the tail end of the customized drill rod; the water inlet of a water injection pump is connected with a water tank, and the water outlet is connected with a rotary joint on the power head through a high-pressure rubber pipe two; a belt conveyor is arranged outside the downhole drilling; a slurry collecting tank, a slurry separating tank and a slurry pump are sequentially connected, and the liquid outlet of the slurry pump is connected with a high-pressure rubber pipe three; a second slag discharge mechanism is arranged in the vertical groove; a main driving sprocket and a driven sprocket are connected on two support frames, a driving chain with a plurality of scraping blades is arranged outside the main driving sprocket and the driven sprocket; a stirring impeller is arranged above the driving sprocket through the support frame; the method comprises the following steps: assembling the system; constructing the downhole drilling; performing slurry and slag discharge operation; and ending the drilling operation. The system and method can solve the problem of difficult slag discharge in long distance downhole ultra-deep drilling.

Description

Technical Field

[0001] This invention belongs to the field of directional drilling technology for ultra-long-distance downward drilling inside coal and rock masses, specifically involving a dual-power slag removal system and method for long-distance ultra-deep downward drilling. Background Technology

[0002] Coal seams in my country generally exhibit the characteristics of "high gas content, high ground stress, high temperature, and low permeability." Pre-draining coal seam gas using long-distance boreholes is one of the key measures to address the current low efficiency of coal seam gas extraction in my country, and it is also an important way to solve gas disasters.

[0003] In recent years, scholars at home and abroad have conducted a great deal of research on key problems such as stuck drill and difficulty in slag removal during long-distance ultra-deep drilling in downboring and near-horizontal drilling. For example, they have developed high-power slurry pumps and adopted the method of coal (rock) slag liquefaction in boreholes. However, these methods have a series of problems in actual implementation, such as long cycle and high energy consumption, which leads to low slag removal efficiency and insignificant improvement effect.

[0004] Therefore, there is an urgent need to provide a new slag removal system and method to overcome the defects and problems existing in conventional drilling methods. Summary of the Invention

[0005] To address the aforementioned problems in the prior art, this invention provides a dual-power slag removal system and method for long-distance ultra-deep drilling. This system has a reasonable structure and diverse functions, enabling distributed processing of slurry and coal slag. It effectively solves the problem of slurry removal difficulties caused by the inability of a single slurry pump to overcome the gravity of the coal slag. The method is simple to implement, has high drilling efficiency, is safe and reliable during the drilling process, and has low energy consumption. It effectively solves the problem of difficult slag removal in long-distance ultra-deep drilling and has broad application and promotion value.

[0006] To achieve the above objectives, the present invention provides a long-distance ultra-deep drilling dual-power slag removal system, comprising a drilling unit, a water injection unit, a dual-power slag removal unit, a controller, and a wireless communication module; The drilling unit includes a drilling rig, a custom drill rod, a drill bit, and a torque sensor. The drilling rig is installed in the work area. The custom drill rod has a water injection channel at its axis and two vertical grooves on opposite sides of its shaft. The upper and lower ends of the vertical grooves extend to positions near the beginning and end of the custom drill rod, respectively. The beginning of the custom drill rod is connected to the power head on the drilling rig, and its lower part is vertically positioned in the descending borehole. The drill bit is fixedly connected to the end of the custom drill rod by a threaded connection. The torque sensor is installed on the outside of the beginning of the custom drill rod. The water injection unit includes a water tank, a water injection pump, a high-pressure hose I, a high-pressure hose II, and a shut-off valve I. The water tank and the water injection pump are installed in the work area. The inlet of the water injection pump is connected to the water tank through the high-pressure hose I. The inlet of the high-pressure hose II is connected to the outlet of the water injection pump. The outlet of the high-pressure hose II is connected to the rotary joint on the power head and communicates with the water injection channel in the center of the custom drill rod through the water injection channel inside the rotary joint. The shut-off valve I is connected in series with the high-pressure hose II. The dual-power slag removal unit includes a belt conveyor, a first slag removal mechanism, and a second slag removal mechanism. The belt conveyor is located in the work area and is supported on the outside of the downward borehole. The feed end of the belt conveyor is located near the edge of the downward borehole. The belt conveyor is driven by a conveyor motor to transport coal slag to the outer area of ​​the downward borehole. The first slag removal mechanism includes a slurry collection tank, a slurry separation tank, a slurry pump, a high-pressure hose, and a shut-off valve. The slurry collection tank, slurry separation tank, and slurry pump are all installed in the work area. The slurry separation tank is supported above the middle section of the belt conveyor, and its outlet is connected to the inlet of the slurry collection tank through a high-pressure hose. Its slag discharge port is located above the carrying section of the belt conveyor. The outlet of the slurry pump is connected to the inlet of the slurry separation tank via a high-pressure hose five, and its suction port is connected to the outlet of a high-pressure hose three. The inlet of the high-pressure hose three extends into the downward borehole, and the shut-off valve two is connected in series with the high-pressure hose three. There are two second slag removal mechanisms, arranged opposite each other in two vertical grooves. Each second slag removal mechanism includes two hydraulic cylinders, two support frames, a drive sprocket, a driven sprocket, a transmission chain, a drive motor, multiple scrapers, a material feeding bracket, a material feeding impeller, a material feeding plate, a material feeding motor, and a power module. The two hydraulic cylinders are distributed vertically opposite each other, located at the top and bottom of the vertical grooves respectively. The hydraulic cylinders are spring-return type hydraulic cylinders, arranged horizontally, and their cylinder ends are connected via... The bracket is fixedly connected to the inner end of the vertical groove; two support frames are respectively set on the outer sides of the two hydraulic cylinders, and the inner end of the support frame is fixedly connected to the piston rod end of the corresponding hydraulic cylinder; the driving sprocket and the driven sprocket are set on the outer sides of the two support frames, with the driving sprocket rotatably connected to the upper support frame and the driven sprocket rotatably connected to the lower support frame; the transmission chain is wound around the outside of the driving sprocket and the driven sprocket; the drive motor is a waterproof motor, which is mounted on the upper support frame, and its output end is connected to the rotating shaft at the center of the driving sprocket to provide driving power to the driving sprocket; multiple scrapers are evenly distributed circumferentially on the surface of the transmission chain, and the scrapers are in the shape of... The structure is L-shaped, with its vertical section fixedly connected to the outer surface of the transmission chain, and its horizontal section used to support coal slag. The material feeding bracket is located above the drive sprocket, is horizontally arranged, and its inner end is fixedly connected to a support frame on the upper side. The material feeding impeller is rotatably connected to the outer end of the material feeding bracket, and four material feeding plates are evenly connected to it in a circumferential direction. The material feeding plate is composed of a rigid section on the inner side and a flexible section on the outer side, wherein the flexible section contacts and cooperates with the scraper during the rotation of the material feeding impeller. The material feeding motor is installed at the outer end of the material feeding bracket, and its output end is connected to the rotating shaft at the center of the material feeding impeller. The power module is installed at the top of the vertical groove, has a waterproof shell, and is connected to two hydraulic cylinders and a drive motor respectively.When both hydraulic cylinders are fully retracted, the edges of the outermost scrapers are located inside the vertical groove; when both hydraulic cylinders are fully extended, the lateral sections of the outermost scrapers extend to the outside of the vertical groove. The controller and wireless communication module are embedded inside the head end of the custom drill pipe. The controller is connected to the torque sensor, power module and wireless communication module respectively.

[0007] In this invention, the water injection pump is connected to the rotary joint on the power head via a second high-pressure hose. This allows for the continuous injection of cooling water into the water injection channels of the custom drill rod during drilling, effectively reducing the drill bit temperature and extending its service life. A shut-off valve is connected in series with the second high-pressure hose to facilitate adjustment of the water flow rate and control of the hose's on / off status. A belt conveyor is positioned on the outer edge of the descending borehole to transport the discharged slag to the surrounding area. A slurry pump is installed around the perimeter of the descending borehole, with the inlet end of a third high-pressure hose connected to its extraction port extending into the borehole. This allows for easy extraction of excess slurry from the borehole, effectively reducing drilling resistance. A slurry separation tank is installed between the slurry pump outlet and the slurry collection tank. This facilitates the separation of coal slag from the slurry before storage, ensuring that the slurry entering the collection tank is free of coal slag and reducing subsequent slurry processing steps. Simultaneously, the slag discharge port of the slurry separation tank is positioned above the belt conveyor, allowing for real-time discharge of coal slag onto the conveyor's carrying section during separation. The conveyor then transports the coal slag to the target area in real-time. Two vertical grooves are formed on opposite sides of the drill rod, with two secondary slag discharge mechanisms positioned within these grooves. This ensures a symmetrical structure for the drill rod, resulting in more balanced stress distribution throughout the rod during drilling. Two hydraulic cylinders are used as connectors to connect two support frames in a vertical groove, and the main and driven sprockets are connected to the two support frames respectively. A transmission chain with multiple scrapers attached to its outer surface is then connected around the outside of the main and driven sprockets. The multiple scrapers, which move with the transmission sprockets, can gradually remove the coal slag accumulated at the bottom of the hole towards the hole opening. At the same time, the extension and retraction control of the two hydraulic cylinders can make the multiple scrapers extend to the outside of the rod or retract into the vertical groove. Thus, during the drilling process, the retraction method can protect the second slag removal mechanism and reduce drilling resistance. At the same time, the extension method can be used to remove slag when drilling stops. A material-pushing impeller is connected to a material-pushing bracket on the upper side, and multiple material-pushing plates are connected to the material-pushing impeller. This allows the rotating material-pushing plates to push the scraper that has moved to the top, thereby throwing the coal slag carried on the horizontal section of the scraper towards the outside of the borehole. This effectively overcomes the problem of difficult discharge of bottom coal (rock) slag during the drilling process of the ultra-deep borehole.A controller is embedded in the custom drill pipe and connected to a torque sensor and a power module. This allows for real-time reception of torque signals during drilling, enabling the acquisition of torque values. Furthermore, the controller facilitates the operation of the power module, thereby controlling multiple scrapers and feed impellers to remove coal slag from the borehole. A wireless communication module is also embedded in the custom drill pipe, allowing for real-time wireless communication between an external control terminal and the controller within the pipe.

[0008] The system has a reasonable structure and multiple functions. It is equipped with a first slag removal mechanism and a second slag removal mechanism. The first slag removal mechanism uses a slurry pump as the power source to extract slurry and realizes distributed treatment of slurry and coal (rock) slag through a slurry separation tank. The second slag removal mechanism uses a drive motor that drives the transmission chain as the power source to remove slag. It further utilizes multiple scrapers on the transmission chain to remove the coal (rock) slag accumulated at the bottom of the hole. This realizes a dual-power slag removal process, which effectively solves the problem of the difficulty in slurry removal caused by the gravity of coal (rock) slag due to the inability of the traditional single slurry pump to overcome the slurry itself, and effectively reduces the resistance in the long-distance ultra-deep drilling process.

[0009] As a preferred embodiment, the customized drill rod comprises a head drill rod, multiple intermediate drill rods, and a tail drill rod. The head drill rod has two top vertical grooves on opposite sides of its shaft, with the top of each groove located at the lower part of the head drill rod shaft and its bottom extending to the lower end face of the head drill rod. The intermediate drill rods have two middle vertical grooves on opposite sides of their shafts, with the top and bottom extending to the upper and lower end faces of the intermediate drill rods, respectively. The tail drill rod has two bottom vertical grooves on opposite sides of its shaft, with the top of each groove extending to the upper end face of the tail drill rod and its bottom located at the lower part of the tail drill rod shaft. The head drill rod, multiple intermediate drill rods, and tail drill rod are cascaded sequentially to form the customized drill rod, and the top vertical grooves, middle vertical grooves, and bottom vertical grooves on both sides are aligned on the same straight line, forming two vertical grooves.

[0010] Furthermore, to facilitate convenient control of the hydraulic cylinder's extension and retraction movements, and simultaneously to facilitate convenient control of the material feeding motor and drive motor's movements, the power module consists of a hydraulic pump station and a battery pack. The hydraulic pump station includes an oil pump, an oil tank, and a solenoid directional valve. The oil pump's suction port is connected to the oil tank, and its discharge port is connected to the solenoid directional valve's inlet port via a high-pressure oil supply line. The solenoid directional valve's working port is connected to the rodless chamber ports of the two hydraulic cylinders via two high-pressure lines, respectively. The solenoid directional valve's return port is connected to the oil tank. The battery pack is connected to both the drive motor and the material feeding motor.

[0011] Furthermore, in order to facilitate the cleaning of multiple scrapers connected to the transmission chain, the dual-power slag discharge unit also includes a scraper cleaning machine; the scraper cleaning machine is installed in the area to be worked on and is located near the edge of the descending borehole. The scraper cleaning machine is used to spray high-pressure water onto the scrapers to clean them.

[0012] As a preferred embodiment, the rigid section is made of an alloy plate, and the flexible section is made of a rubber plate.

[0013] Furthermore, to facilitate remote control of the second slag discharge mechanism, a remote controller is also included, which is connected to the controller via a wireless communication module; the controller is a PLC controller.

[0014] This invention also provides a method for dual-power muck removal in long-distance ultra-deep drilling, employing a dual-power muck removal system for long-distance ultra-deep drilling, specifically including the following steps: Step 1: Assemble the drilling unit, and arrange the water injection unit, the first slag removal mechanism, and the belt conveyor; S11: Two hydraulic cylinders are symmetrically connected to the bottom of the two vertical grooves on the tail drill rod using two mounting brackets. Two support frames are symmetrically connected to the two hydraulic cylinders. Two driven sprockets are then connected to the two support frames respectively. Next, the middle part of the two transmission chains with scrapers is wound around the two driven sprockets. At the same time, the two ends of each transmission chain are temporarily fixed to the top of the bottom vertical groove through transition brackets. S12: Connect the drill bit to the end of the tail drill rod and connect the head of the tail drill rod to the power head on the drilling rig. S13: Install the water tank and water pump in the area to be worked, and connect the water pump and water tank using high-pressure hose one, and connect the water pump and the rotary joint on the power head using high-pressure hose two. Install the slurry collection tank, slurry separation tank, and slurry pump in the work area, and connect the slurry separation tank and slurry collection tank with high-pressure hose four, connect the slurry pump and slurry separation tank with high-pressure hose five, and connect the outlet end of high-pressure hose three to the inlet of the slurry pump. Arrange the belt conveyor in the area to be worked, and position it below the slurry separation tank, while positioning its feed end at the edge of the downward borehole to be drilled; Step Two: Construction of the Downward Drilling Hole; S21: First, the drilling rig drives the tail drill rod to perform drilling operations in the coal seam. During the drilling process, the water injection unit is turned on, and the water injection pump supplies cooling water through the rotary joint on the high-pressure hose two-way power head. The cooling water flows through the water injection channel inside the rotary joint into the water injection channel in the tail drill rod and flows to the drill bit to perform online cooling operations on the drill bit. S22: As the drilling depth increases, multiple intermediate drill rods are cascaded at the upper end of the tail drill rod, and two transmission chains are connected sequentially during the cascading process. At the same time, the two ends of each transmission chain are temporarily fixed to the top of the vertical groove in the middle of the uppermost intermediate drill rod after cascading through transition brackets. Finally, the head drill rod is connected to the upper end of the uppermost intermediate drill rod to form a customized drill rod. Two hydraulic cylinders are symmetrically connected to the top of the two top vertical grooves on the head drill rod, and two support frames are symmetrically connected to the two hydraulic cylinders. Then, two drive sprockets are connected to the two support frames respectively, and two material feeding brackets are symmetrically connected to the two support frames. Material feeding impellers are connected to the two material feeding brackets. Then, two transmission chains are connected, and the two transmission chains are closed on the two drive sprockets to form two closed transmission chains on both sides of the customized drill rod. S23: After the downhole reaches the predetermined drilling depth A, if the water accumulation in the hole exceeds the preset upper limit height A, proceed to step three; Step 3: Perform slurry and slag removal operations; First, stop the drilling operation of the customized drill rod and the water injection operation of the water injection unit. Then, extend the inlet end of the high-pressure hose three to the bottom of the descending borehole. Simultaneously, start the first slag discharge mechanism and the belt conveyor. Use the slurry pump to extract part of the slurry accumulated at the bottom of the borehole through the high-pressure hose three and transport it to the slurry separation tank to reduce drilling resistance. At the same time, use the slurry separation tank to separate the coal slag in the slurry and discharge the coal slag to the bearing section of the belt conveyor through the slag discharge port. Simultaneously, use the running belt conveyor to transport the coal slag to the set area. When the water accumulation in the hole is lower than the preset lower limit height B, remove the high-pressure hose three from the hole and then proceed to step four. Step 4: Repeat steps 2 and 3. During step 2, the torque sensor collects the torque signal of the customized drill rod in real time and sends it to the controller. The controller obtains the torque value based on the received torque signal and then sends the obtained torque value to the display terminal for real-time display through the wireless communication module. When the torque value exceeds the set value C, step 5 is executed. Otherwise, steps 2 and 3 are repeated until the predetermined drilling depth B is reached, at which point the process ends and step 6 is executed. Step 5: Perform slag removal operation; First, stop the drilling operation of the custom drill rod and the water injection operation of the water injection unit. Adjust the angle of the custom drill rod so that one of the vertical grooves faces the belt conveyor. Then, use the remote control to send a wireless control signal A to the controller. When the controller receives the wireless control signal A, it controls the power module to perform action A, causing the two hydraulic cylinders in each second slag discharge mechanism to extend synchronously to their maximum displacement state. It also starts the drive motor and the feeding motor, causing multiple scrapers on the outer side to move from bottom to top, and causing the feeding impeller to drive the feeding plate to rotate. During this process, the multiple scrapers moving from bottom to top remove the coal accumulated at the bottom of the hole. The slag is gradually carried away towards the orifice, and the flexible section of the material feeding plate moves the scraper to the top to throw the slag on the horizontal section of the scraper towards the outside of the orifice. Simultaneously, the carrying section of the belt conveyor receives the thrown slag and transports it to the set area. When the slag on the scraper continues to decrease, the remote control sends a wireless control signal B to the controller. When the controller receives the wireless control signal B, it controls the power module to perform action B, so that the two hydraulic cylinders in each second slag discharge mechanism retract synchronously to the maximum displacement state, and the drive motor and the material feeding motor stop running. Then, step four is executed. Step Six: End drilling operation; Remove the water tank, water injection pump, slurry collection tank, slurry separation tank, slurry discharge pump, and belt conveyor from the work area, and then use the drilling rig to drive the custom drill rod away from the descending borehole.

[0015] Furthermore, in order to effectively collect the slag thrown out by the second slag discharge mechanism, in step five, before sending wireless control signal A to the controller using a remote control, a slag collection box with an open top is placed on the opposite side of the belt conveyor.

[0016] As a preferred option, in step six, the scraper cleaning machine is first started, and the high-pressure water jet from the scraper cleaning machine is used to clean the scrapers in the second slag discharge mechanism. Then, the drilling rig is used to drive the customized drill rod away from the downward drilling hole.

[0017] This method features simple implementation steps, high drilling efficiency, safe and reliable drilling process, and low energy consumption. It can utilize a slurry pump to drain slurry when there is a large accumulation of slurry in the hole, and can use a slurry separation tank to separate coal slag from the discharged slurry in real time. It can also use multiple scrapers connected to the transmission chain to remove slag when there is a large accumulation of coal slag at the bottom of the hole, and can use a rotating feed impeller to throw the coal slag carried on the scrapers to the outside of the hole. This invention effectively solves the problem of difficult slag removal in long-distance ultra-deep drilling through dual slag removal methods, providing an effective way for gas extraction and has broad application and promotion value. Attached Figure Description

[0018] Figure 1This is a schematic diagram of the structure of the long-distance ultra-deep borehole dual-power slag removal system in this invention; Figure 2 This is a schematic diagram of the structure of the customized drill pipe in this invention; Figure 3 This is a schematic diagram of the head drill rod structure in this invention; Figure 4 This is a schematic diagram of the structure of the middle section of the drill pipe in this invention; Figure 5 This is a schematic diagram of the tail drill rod structure in this invention; Figure 6 This is a schematic diagram of the structure of the second slag discharge mechanism in this invention; Figure 7 This is a schematic diagram of the assembly of the feeding impeller and the feeding motor in this invention.

[0019] In the diagram: 1. Drilling rig; 2. Custom drill rod; 3. Downward drilling hole; 4. Drill bit; 5. Water injection channel; 6. Stop valve one; 7. Water injection pump; 8. Water tank; 9. Stop valve two; 10. Slurry pump; 11. Slurry separation tank; 12. Coal seam; 13. High-pressure hose one; 14. High-pressure hose two; 15. Vertical groove; 16. Second slag discharge mechanism; 17. Support frame; 18. Drive sprocket; 19. Slurry collection tank; 20. High-pressure hose three; 21. Belt conveyor; 22. Conveyor motor; 23. Scraper cleaning machine; 24. High-pressure hose four; 25. High-pressure hose five. 26. Hydraulic cylinder; 27. Torque sensor; 28. Driven sprocket; 29. ​​Power head; 30. Transmission chain; 31. Drive motor; 32. Scraper; 33. Material feeding bracket; 34. Material feeding impeller; 35. Material feeding motor; 36. Material feeding plate; 37. Rigid section; 38. Flexible section; 39. Slag discharge port; 40. Power module; 41. Controller; 42. Wireless communication module; 43. Head drill rod; 44. Middle section drill rod; 45. Tail drill rod; 46. Top vertical groove; 47. Middle vertical groove; 48. Bottom vertical groove; 49. Mounting bracket. Detailed Implementation

[0020] The invention will now be further described with reference to the accompanying drawings.

[0021] like Figures 1 to 7 As shown, the present invention provides a long-distance ultra-deep drilling dual-power slag removal system, including a drilling unit, a water injection unit, a dual-power slag removal unit, a controller 41 and a wireless communication module 42; The drilling unit includes a drilling rig 1, a custom drill rod 2, a drill bit 4, and a torque sensor 27. The drilling rig 1 is installed in the work area. The custom drill rod 2 has a water injection channel 5 at its shaft center, and two vertical grooves 15 are opened on opposite sides of its rod body. The upper and lower ends of the vertical grooves 15 extend to positions close to the beginning and end of the custom drill rod 2, respectively. The beginning of the custom drill rod 2 is connected to the power head 29 on the drilling rig 1, and its lower part is vertically set in the descending borehole 3. The drill bit 4 is fixedly connected to the end of the custom drill rod 2 by a threaded connection. The torque sensor 27 is installed on the outside of the beginning of the custom drill rod 2. The water injection unit includes a water tank 8, a water injection pump 7, a high-pressure hose 13, a high-pressure hose 2 14, and a shut-off valve 6. The water tank 8 and the water injection pump 7 are installed in the work area. The inlet of the water injection pump 7 is connected to the water tank 8 through the high-pressure hose 13. The inlet of the high-pressure hose 2 14 is connected to the outlet of the water injection pump 7. The outlet of the high-pressure hose 2 14 is connected to the rotary joint on the power head 29 and communicates with the water injection channel 5 in the center of the custom drill rod 2 through the water injection channel inside the rotary joint. The shut-off valve 6 is connected in series with the high-pressure hose 2 14. The dual-power slag removal unit includes a belt conveyor 21, a first slag removal mechanism, and a second slag removal mechanism 16. The belt conveyor 21 is located in the work area and is supported on the outside of the downward borehole 3. The feed end of the belt conveyor 21 is located near the edge of the downward borehole 3. The belt conveyor 21 is driven by a conveying motor 22 to transport coal slag to the outer area of ​​the downward borehole 3. The first slag removal mechanism includes a slurry collection tank 19, a slurry separation tank 11, a slurry pump 10, a high-pressure hose 20, and a shut-off valve 9. The slurry collection tank 19, the slurry separation tank 11, and the slurry pump 10 are all installed in the work area. The slurry separation tank 11 is supported above the middle section of the belt conveyor 21, and its outlet is connected to the high-pressure hose 20. 4 is connected to the inlet of the slurry collection tank 19, and its slag discharge port 39 is located above the bearing section of the belt conveyor 21; the outlet of the slurry pump 10 is connected to the inlet of the slurry separation tank 11 through the high-pressure hose 25, and its suction port is connected to the outlet of the high-pressure hose 20. The inlet of the high-pressure hose 20 extends into the downward drill hole 3, and the shut-off valve 29 is connected in series with the high-pressure hose 20; there are two second slag discharge mechanisms 16, which are arranged opposite to each other in two vertical grooves 15; the second slag discharge mechanism 16 includes two hydraulic cylinders 26, two support frames 17, a drive sprocket 18, a driven sprocket 28, a transmission chain 30, a drive motor 31, multiple scrapers 32, a material feeding bracket 33, a material feeding impeller 34, a material feeding plate 36, and a material feeding mechanism. The system includes a motor 35 and a power module 40; two hydraulic cylinders 26 are arranged vertically opposite each other, located at the top and bottom of the vertical groove 15 respectively; each hydraulic cylinder 26 is a spring-return type hydraulic cylinder, arranged horizontally, and its cylinder end is fixedly connected to the inner end of the vertical groove 15 via a mounting bracket 49; two support frames 17 are respectively arranged on the outer sides of the two hydraulic cylinders 26, and the inner end of the support frame 17 is fixedly connected to the piston rod end of the corresponding hydraulic cylinder 26; the driving sprocket 18 and the driven sprocket 28 are arranged vertically opposite each other on the outer sides of the two support frames 17, with the driving sprocket 18 rotatably connected to the upper support frame 17 and the driven sprocket 28 rotatably connected to the lower support frame 17; and a transmission chain. The drive chain 30 is connected around the outside of the drive sprocket 18 and the driven sprocket 28; the drive motor 31 is a waterproof motor, which is mounted on a support frame 17 on the upper side, and its output end is connected to the rotating shaft at the center of the drive sprocket 18 to provide driving power to the drive sprocket 18; multiple scrapers 32 are evenly distributed circumferentially on the surface of the drive chain 30, the scrapers 32 are L-shaped, and their vertical sections are fixedly connected to the outer surface of the drive chain 30, and their horizontal sections are used to carry coal slag; the material feeding bracket 33 is located above the drive sprocket 18, it is arranged horizontally, and its inner end is fixedly connected to a support frame 17 on the upper side; the material feeding impeller 34 is rotatably connected to the outer end of the material feeding bracket 33, and four material feeding plates 36 are evenly connected circumferentially on it;The feeding plate 36 is composed of a rigid section 37 located on the inner side and a flexible section 38 located on the outer side. During the rotation of the feeding impeller 34, the flexible section 38 contacts and engages with the scraper 32. The feeding motor 35 is installed at the outer end of the feeding bracket 33, and its output end is connected to the rotating shaft at the center of the feeding impeller 34. The power module 40 is installed at the top of the vertical groove 15, has a waterproof shell, and is connected to two hydraulic cylinders 26 and a drive motor 31 respectively. When the two hydraulic cylinders 26 are in the fully retracted state, the edges of the multiple scrapers 32 located on the outer side are located on the inner side of the vertical groove 15. When the two hydraulic cylinders 26 are in the fully extended state, the transverse sections of the multiple scrapers 32 located on the outer side extend to the outer side of the vertical groove 15. The controller 41 and the wireless communication module 42 are embedded inside the head end of the custom drill pipe 2. The controller 41 is connected to the torque sensor 27, the power module and the wireless communication module 42 respectively.

[0022] In this invention, the water injection pump is connected to the rotary joint on the power head via a second high-pressure hose. This allows for the continuous injection of cooling water into the water injection channels of the custom drill rod during drilling, effectively reducing the drill bit temperature and extending its service life. A shut-off valve is connected in series with the second high-pressure hose to facilitate adjustment of the water flow rate and control of the hose's on / off status. A belt conveyor is positioned on the outer edge of the descending borehole to transport the discharged slag to the surrounding area. A slurry pump is installed around the perimeter of the descending borehole, with the inlet end of a third high-pressure hose connected to its extraction port extending into the borehole. This allows for easy extraction of excess slurry from the borehole, effectively reducing drilling resistance. A slurry separation tank is installed between the slurry pump outlet and the slurry collection tank. This facilitates the separation of coal slag from the slurry before storage, ensuring that the slurry entering the collection tank is free of coal slag and reducing subsequent slurry processing steps. Simultaneously, the slag discharge port of the slurry separation tank is positioned above the belt conveyor, allowing for real-time discharge of coal slag onto the conveyor's carrying section during separation. The conveyor then transports the coal slag to the target area in real-time. Two vertical grooves are formed on opposite sides of the drill rod, with two secondary slag discharge mechanisms positioned within these grooves. This ensures a symmetrical structure for the drill rod, resulting in more balanced stress distribution throughout the rod during drilling. Two hydraulic cylinders are used as connectors to connect two support frames in a vertical groove, and the main and driven sprockets are connected to the two support frames respectively. A transmission chain with multiple scrapers attached to its outer surface is then connected around the outside of the main and driven sprockets. The multiple scrapers, which move with the transmission sprockets, can gradually remove the coal slag accumulated at the bottom of the hole towards the hole opening. At the same time, the extension and retraction control of the two hydraulic cylinders can make the multiple scrapers extend to the outside of the rod or retract into the vertical groove. Thus, during the drilling process, the retraction method can protect the second slag removal mechanism and reduce drilling resistance. At the same time, the extension method can be used to remove slag when drilling stops. A material-pushing impeller is connected to a material-pushing bracket on the upper side, and multiple material-pushing plates are connected to the material-pushing impeller. This allows the rotating material-pushing plates to push the scraper that has moved to the top, thereby throwing the coal slag carried on the horizontal section of the scraper towards the outside of the borehole. This effectively overcomes the problem of difficult discharge of bottom coal (rock) slag during the drilling process of the ultra-deep borehole.A controller is embedded in the custom drill pipe and connected to a torque sensor and a power module. This allows for real-time reception of torque signals during drilling, enabling the acquisition of torque values. Furthermore, the controller facilitates the operation of the power module, thereby controlling multiple scrapers and feed impellers to remove coal slag from the borehole. A wireless communication module is also embedded in the custom drill pipe, allowing for real-time wireless communication between an external control terminal and the controller within the pipe.

[0023] The system has a reasonable structure and multiple functions. It is equipped with a first slag removal mechanism and a second slag removal mechanism. The first slag removal mechanism uses a slurry pump as the power source to extract slurry and realizes distributed treatment of slurry and coal (rock) slag through a slurry separation tank. The second slag removal mechanism uses a drive motor that drives the transmission chain as the power source to remove slag. It further utilizes multiple scrapers on the transmission chain to remove the coal (rock) slag accumulated at the bottom of the hole. This realizes a dual-power slag removal process, which effectively solves the problem of the difficulty in slurry removal caused by the gravity of coal (rock) slag due to the inability of the traditional single slurry pump to overcome the slurry itself, and effectively reduces the resistance in the long-distance ultra-deep drilling process.

[0024] As a preferred embodiment, the customized drill rod 2 comprises a head drill rod 43, multiple intermediate drill rods 44, and a tail drill rod 45. The head drill rod 43 has two top vertical grooves 46 on opposite sides of its shaft, with the top of each groove located at the lower part of the head drill rod 43 and its bottom extending to the lower end face of the head drill rod 43. The intermediate drill rods 44 have two middle vertical grooves 47 on opposite sides of their shafts, with the top and bottom of each groove extending to the upper end face of the intermediate drill rod 44, respectively. On the upper and lower end faces; two bottom vertical grooves 48 are opened on opposite sides of the tail drill rod 45. The top of the bottom vertical groove 48 extends to the upper end face of the tail drill rod 45, and its bottom is located at the lower part of the tail drill rod 45. The head drill rod 43, multiple middle drill rods 44 and tail drill rod 45 are cascaded to form a customized drill rod 2, and the top vertical grooves 46, the middle vertical grooves 47 and the bottom vertical grooves 48 on both sides are located on the same straight line and together form two vertical grooves 15.

[0025] To facilitate convenient control of the hydraulic cylinder's extension and retraction movements, and also to facilitate convenient control of the material feeding motor and drive motor's movements, the power module consists of a hydraulic pump station and a battery pack. The hydraulic pump station includes an oil pump, an oil tank, and a solenoid directional valve. The oil pump's suction port is connected to the oil tank, and its discharge port is connected to the solenoid directional valve's inlet via a high-pressure oil supply line. The solenoid directional valve's working port is connected to the rodless chamber ports of multiple hydraulic cylinders 26 via two high-pressure pipelines, and the solenoid directional valve's return port is connected to the oil tank. The battery pack is connected to the drive motor 31 and the material feeding motor 35. Alternatively, the power module can also serve as an external circuit interface and an external high-pressure oil supply interface. The circuit interface is connected to the drive motor 31 and the material feeding motor 35, and the high-pressure oil supply interface is connected to the rodless chamber ports of multiple hydraulic cylinders 26 via two high-pressure pipelines.

[0026] In order to facilitate the cleaning of multiple scrapers connected to the transmission chain, the dual-power slag discharge unit also includes a scraper cleaning machine 23. The scraper cleaning machine 23 is installed in the area to be worked and is located near the edge of the downward drilling hole 3. Preferably, the scraper cleaning machine 23 is a high-pressure water pump. The scraper cleaning machine 23 is used to spray high-pressure water flow onto the scraper 32 to clean the scraper 32.

[0027] As a preferred embodiment, the rigid section 37 is made of an alloy plate, and the flexible section 38 is made of a rubber plate.

[0028] To facilitate remote control of the second slag discharge mechanism, a remote controller is also included. The remote controller is connected to the controller 41 via a wireless communication module 42. The controller 41 is a PLC controller.

[0029] This invention also provides a method for dual-power muck removal in long-distance ultra-deep drilling, employing a dual-power muck removal system for long-distance ultra-deep drilling, specifically including the following steps: Step 1: Assemble the drilling unit, and arrange the water injection unit, the first slag removal mechanism, and the belt conveyor 21; S11: Two hydraulic cylinders 26 are symmetrically connected to the bottom of the two bottom vertical grooves 48 on the tail drill rod 45 using two mounting brackets 49. Two support frames 17 are symmetrically connected to the two hydraulic cylinders 26. Two driven sprockets 28 are then connected to the two support frames 17 respectively. Next, the middle part of the two transmission chains 30 connected with scraper 32 is wound around the two driven sprockets 28. At the same time, the two ends of each transmission chain 30 are temporarily fixed to the top of the bottom vertical groove 48 through transition brackets. Meanwhile, two high-pressure oil supply lines are connected to the oil ports of the rodless chambers of the two hydraulic cylinders 26. The free ends of the two high-pressure oil supply lines are temporarily fixed to the top of the bottom vertical groove 48 through transition brackets. During this process, plugs are sealed at the free ends of the two high-pressure oil supply lines to prevent impurities from entering the high-pressure oil supply lines. The transition bracket can be connected to the threaded hole in the bottom vertical groove 48 by bolts. The transition bracket is used as a temporary transition during the connection process, and can be removed after the connection is completed. S12: Connect the drill bit 4 to the end of the tail drill rod 45, and connect the head of the tail drill rod 45 to the power head 29 on the drilling machine 1. S13: Install the water tank 8 and the water pump 7 in the area to be operated, and connect the water pump 7 and the water tank 8 using the high-pressure hose 13, and connect the water pump 7 and the rotary joint on the power head 29 using the high-pressure hose 24. Install the slurry collection tank 19, the slurry separation tank 11 and the slurry pump 10 in the work area, and connect the slurry separation tank 11 and the slurry collection tank 19 with the high-pressure hose 24, connect the slurry pump 10 and the slurry separation tank 11 with the high-pressure hose 25, and connect the outlet end of the high-pressure hose 20 to the inlet of the slurry pump 10. The belt conveyor 21 is arranged in the area to be worked, and it is positioned below the slurry separation tank 11, while its feed end is positioned at the edge of the downward borehole 3 to be drilled. Step 2: Construction of the downhole borehole 3; S21: First, the drill rig 1 drives the tail drill rod 45 to perform drilling operations in the coal seam 12. During the drilling process, the water injection unit is turned on, and the water injection pump 7 supplies cooling water to the rotary joint on the power head 29 through the high pressure hose 14. The cooling water flows through the water injection channel inside the rotary joint into the water injection channel 5 in the tail drill rod 45 and flows to the drill bit 4 to perform online cooling operations on the drill bit 4. S22: As the drilling depth increases, multiple intermediate drill rods 44 are cascaded sequentially at the upper end of the tail drill rod 45. During the cascading process, two transmission chain segments 30 and two high-pressure oil supply lines 1 are connected sequentially. Simultaneously, the two ends of each transmission chain segment 30 are temporarily fixed to the top of the vertical groove 47 in the middle of the uppermost intermediate drill rod 44 after cascading via transition brackets. The free ends of the two high-pressure oil supply lines 1 are temporarily fixed to the top of the vertical groove 47 in the middle of the uppermost intermediate drill rod 44 after cascading via transition brackets. Plugs are then sealed to the free ends of the two high-pressure oil supply lines 1. Finally, the head drill rod 43 is connected to the upper end of the uppermost intermediate drill rod 44 to form a customized drill rod 2. Two hydraulic cylinders 26 are then symmetrically connected to the top of the two top vertical grooves 46 on the head drill rod 43. Two support frames 17 are symmetrically connected to two hydraulic cylinders 26. Then, two drive sprockets 18 are respectively connected to the two support frames 17, and two material feeding brackets 33 are symmetrically connected to the two support frames 17. Material feeding impellers 34 are connected to the two material feeding brackets 33. Next, two transmission chains 30 are connected and closed on the two drive sprockets 18, forming two closed transmission chains 30 on both sides of the custom drill rod 2. At the same time, two high-pressure oil supply lines 1 are connected. Then, two high-pressure oil supply lines 2 are connected to the rodless chamber oil ports of the two upper hydraulic cylinders 26. The free ends of the two high-pressure oil supply lines 1 and 2 are connected to the working oil ports of the electromagnetic reversing valve on the hydraulic pump station. Then, the drive motor 31 and the material feeding motor 35 are connected to the battery pack. The transition bracket can be connected to the threaded hole in the central vertical groove 47 by bolts. The transition bracket is used as a temporary transition during the continuation process, and can be removed after the continuation. S23: After the downhole 3 reaches the predetermined drilling depth A, if the water accumulation in the hole exceeds the preset upper limit height A, proceed to step three. The diameter of the downhole 3 is determined based on the size of the drill bit 4; Step 3: Perform slurry and slag removal operations; First, stop the drilling operation of the customized drill rod 2 and the water injection operation of the water injection unit. Then, extend the inlet end of the high-pressure hose 3 20 to the bottom of the descending borehole 3. Simultaneously, start the first slag discharge mechanism and the belt conveyor 21. Use the slurry pump 10 to extract part of the slurry accumulated at the bottom of the borehole through the high-pressure hose 3 20 and transport it to the slurry separation tank 11 to reduce drilling resistance. At the same time, use the slurry separation tank 11 to separate the coal slag in the slurry and discharge the coal slag through the slag discharge port 39 onto the carrying section of the belt conveyor 21. Simultaneously, use the running belt conveyor 21 to transport the coal slag to the set area. When the water accumulation in the hole is lower than the preset lower limit height B, remove the high-pressure hose 3 20 from the hole and then proceed to step four. Step 4: Repeat steps 2 and 3. During step 2, the torque sensor 27 collects the torque signal of the customized drill rod 2 in real time and sends it to the controller 41 in real time. The controller 41 obtains the torque value based on the received torque signal and then sends the obtained torque value to the display terminal for real-time display through the wireless communication module 42. When the torque value exceeds the set value C, step 5 is executed. Otherwise, steps 2 and 3 are repeated until the predetermined drilling depth B is reached, at which point the process ends and step 6 is executed. Step 5: Perform slag removal operation; First, stop the drilling operation of the custom drill rod 2 and the water injection operation of the water injection unit, and adjust the angle of the custom drill rod 2 so that one of the vertical grooves 15 faces the belt conveyor 21. Then, use the remote control to send a wireless control signal A to the controller 41. When the controller 41 receives the wireless control signal A, it controls the power module to perform action A, so that the two hydraulic cylinders 26 in each second slag discharge mechanism 16 extend synchronously to the maximum displacement state, and start the drive motor 31 and the feeding motor 35 to run. This causes the multiple scrapers 32 on the outer side to move from bottom to top, and causes the feeding impeller 34 to drive the feeding plate 36 to rotate. During this process, the multiple scrapers 32 moving from bottom to top remove the slag accumulated at the bottom of the hole. The coal slag is gradually carried away towards the orifice, and the flexible section 38 of the material-pushing plate 36 is used to push the scraper 32 that has moved to the top, so as to throw the coal slag on the transverse section of the scraper 32 towards the outside of the orifice. Simultaneously, the carrying section of the belt conveyor 21 receives the thrown coal slag and transports it to the set area. When the coal slag on the scraper 32 continues to decrease, the remote controller sends a wireless control signal B to the controller 41. When the controller 41 receives the wireless control signal B, it controls the power module to perform action B, so that the two hydraulic cylinders 26 in each second slag discharge mechanism 16 retract synchronously to the maximum displacement state, and the drive motor 31 and the material-pushing motor 35 stop running. Then, step four is executed. Step Six: End drilling operation; Remove the water tank 8, water injection pump 7, slurry collection tank 19, slurry separation tank 11, slurry discharge pump 10 and belt conveyor 21 from the work area, and then use the drilling rig 1 to drive the customized drill rod 2 away from the descending borehole 3.

[0030] In order to effectively collect the slag thrown out by the second slag discharge mechanism, in step five, before sending the wireless control signal A to the controller 41 using the remote control, a slag collection box with an open top is placed on the opposite side of the belt conveyor 21.

[0031] As a preferred option, in step six, the scraper cleaning machine 23 is first started, and the high-pressure water jet sprayed by the scraper cleaning machine 23 is used to clean the scraper 32 in the second slag discharge mechanism 16. Then, the drill rig 1 is used to drive the customized drill rod 2 away from the descending drill hole 3.

[0032] This method features simple implementation steps, high drilling efficiency, safe and reliable drilling process, and low energy consumption. It can utilize a slurry pump to drain slurry when there is a large accumulation of slurry in the hole, and can use a slurry separation tank to separate coal slag from the discharged slurry in real time. It can also use multiple scrapers connected to the transmission chain to remove slag when there is a large accumulation of coal slag at the bottom of the hole, and can use a rotating feed impeller to throw the coal slag carried on the scrapers to the outside of the hole. This invention effectively solves the problem of difficult slag removal in long-distance ultra-deep drilling through dual slag removal methods, providing an effective way for gas extraction and has broad application and promotion value.

Claims

1. A dual-power slag removal system for long-distance ultra-deep drilling, comprising a drilling unit and a water injection unit; Its features are, It also includes a dual-power slag discharge unit, a controller (41) and a wireless communication module (42). The drilling unit includes a drilling rig (1), a custom drill rod (2), a drill bit (4), and a torque sensor (27). The drilling rig (1) is installed in the work area. A water injection channel (5) is provided at the axis of the custom drill rod (2). Two vertical grooves (15) are provided on opposite sides of the rod body. The upper and lower ends of the vertical grooves (15) extend to the positions close to the head and the end of the custom drill rod (2), respectively. The head of the custom drill rod (2) is connected to the power head (29) on the drilling rig (1), and its lower part is vertically set in the descending borehole (3). The drill bit (4) is fixedly connected to the end of the custom drill rod (2) by threaded connection. The torque sensor (27) is installed on the outside of the head of the custom drill rod (2). The water injection unit includes a water tank (8), a water injection pump (7), a high-pressure hose one (13), a high-pressure hose two (14), and a shut-off valve one (6); the water tank (8) and the water injection pump (7) are installed in the work area. The inlet of the water injection pump (7) is connected to the water tank (8) through the high-pressure hose one (13). The inlet of the high-pressure hose two (14) is connected to the outlet of the water injection pump (7). The outlet of the high-pressure hose two (14) is connected to the rotary joint on the power head (29) and is connected to the water injection channel (5) in the center of the custom drill rod (2) through the water injection channel inside the rotary joint. The shut-off valve one (6) is connected in series on the high-pressure hose two (14). The dual-power slag removal unit includes a belt conveyor (21), a first slag removal mechanism, and a second slag removal mechanism (16). The belt conveyor (21) is located in the work area and is supported on the outside of the downhole (3). The feed end of the belt conveyor (21) is located near the edge of the downhole (3). The belt conveyor (21) is driven by a conveying motor (22) to transport coal slag to the outer area of ​​the downhole (3). The first slag removal mechanism includes a slurry collection tank (19), a slurry separation tank (11), a slurry pump (10), a high-pressure hose (20), and a shut-off valve (9). The slurry collection tank (19), the slurry separation tank (11), and the slurry pump (10) are all installed in the work area. The slurry separation tank (11) is supported above the middle section of the belt conveyor (21), and its outlet is connected to the inlet of the slurry collection tank (19) through a high-pressure hose four (24). Its slag discharge port (39) is located above the bearing section of the belt conveyor (21). The outlet of the slurry pump (10) is connected to the inlet of the slurry separation tank (11) through a high-pressure hose five (25), and its suction port is connected to the outlet of the high-pressure hose three (20). The inlet of the high-pressure hose three (20) extends into the downward borehole (3). The shut-off valve two (9) is connected in series on the high-pressure hose three (20). There are two second slag discharge mechanisms (16), which are arranged opposite each other in two vertical grooves (15). The system includes two hydraulic cylinders (26), two support frames (17), a drive sprocket (18), a driven sprocket (28), a transmission chain (30), a drive motor (31), multiple scrapers (32), a feeding bracket (33), a feeding impeller (34), a feeding plate (36), a feeding motor (35), and a power module (40). The two hydraulic cylinders (26) are distributed vertically relative to each other and are located at the top and bottom of the vertical groove (15), respectively. The hydraulic cylinders (26) are spring-return type hydraulic cylinders, which are arranged horizontally, and their cylinder ends are fixedly connected to the inner end of the vertical groove (15) through mounting brackets (49). The two support frames (17) are respectively set on the outer side of the two hydraulic cylinders (26). The inner end of the support frame (17) is fixedly connected to the piston rod end of the corresponding hydraulic cylinder (26); the driving sprocket (18) and the driven sprocket (28) are arranged opposite each other on the outside of the two support frames (17), and the driving sprocket (18) is rotatably connected to the upper support frame (17), and the driven sprocket (28) is rotatably connected to the lower support frame (17); the transmission chain (30) is wound around the outside of the driving sprocket (18) and the driven sprocket (28); the drive motor (31) is a waterproof motor, which is installed on the upper support frame (17), and its output end is connected to the rotating shaft at the center of the driving sprocket (18) to provide driving power to the driving sprocket (18);Multiple scrapers (32) are evenly distributed circumferentially on the surface of the transmission chain (30). The scrapers (32) are L-shaped, and their vertical sections are fixedly connected to the outer surface of the transmission chain (30), while their horizontal sections are used to carry coal slag. The material feeding bracket (33) is located above the drive sprocket (18), and it is arranged horizontally. Its inner end is fixedly connected to a support frame (17) on the upper side. The material feeding impeller (34) is rotatably connected to the outer end of the material feeding bracket (33), and four material feeding plates (36) are evenly connected circumferentially on it. The material feeding plate (36) is composed of a rigid section (37) on the inner side and a flexible section (38) on the outer side. When the material feeding impeller (34) rotates, the material feeding plate (36) is connected to the outer side. During the process, the flexible section (38) contacts and engages with the scraper (32); the feeding motor (35) is installed at the outer end of the feeding bracket (33), and its output end is connected to the rotating shaft at the center of the feeding impeller (34); the power module (40) is installed on the top of the vertical groove (15), which has a waterproof shell and is connected to two hydraulic cylinders (26) and a drive motor (31) respectively; when the two hydraulic cylinders (26) are in the fully retracted state, the edges of the multiple scrapers (32) located on the outer side are located on the inner side of the vertical groove (15); when the two hydraulic cylinders (26) are in the fully extended state, the transverse sections of the multiple scrapers (32) located on the outer side extend to the outer side of the vertical groove (15); The controller (41) and the wireless communication module (42) are embedded inside the head end of the custom drill pipe (2). The controller (41) is connected to the torque sensor (27), the power module and the wireless communication module (42) respectively.

2. The long-distance ultra-deep drilling dual-power slag removal system according to claim 1, characterized in that, The customized drill pipe (2) consists of a head drill pipe (43), multiple intermediate drill pipes (44), and a tail drill pipe (45). The head drill pipe (43) has two top vertical grooves (46) on opposite sides of its shaft. The top of the top vertical grooves (46) is located at the lower part of the head drill pipe (43), and its bottom extends to the lower end face of the head drill pipe (43). The intermediate drill pipes (44) have two middle vertical grooves (47) on opposite sides of their shafts. The top and bottom of the middle vertical grooves (47) extend to the upper end face and lower end face of the intermediate drill pipes (44), respectively. On the end face; two bottom vertical grooves (48) are opened on opposite sides of the tail drill rod (45). The top of the bottom vertical groove (48) extends to the upper end face of the tail drill rod (45), and its bottom end is located at the lower part of the tail drill rod (45). The head drill rod (43), multiple middle drill rods (44) and tail drill rod (45) are cascaded to form a customized drill rod (2). The top vertical grooves (46), the middle vertical grooves (47) and the bottom vertical grooves (48) on both sides are located on the same straight line and together form two vertical grooves (15).

3. A long-distance ultra-deep drilling dual-power slag removal system according to claim 1 or 2, characterized in that, The power module consists of a hydraulic pump station and a battery pack. The hydraulic pump station includes an oil pump, an oil tank, and an electromagnetic directional valve. The oil pump's suction port is connected to the oil tank, and its discharge port is connected to the electromagnetic directional valve's inlet port through a high-pressure oil supply pipeline. The electromagnetic directional valve's working port is connected to the rodless chamber ports of two hydraulic cylinders (26) through two high-pressure pipelines. The electromagnetic directional valve's return port is connected to the oil tank. The battery pack is connected to the drive motor (31) and the feeding motor (35) respectively.

4. The dual-power slag removal system for long-distance ultra-deep drilling as described in claim 3, characterized in that, The dual-power slag removal unit also includes a scraper cleaning machine (23); the scraper cleaning machine (23) is installed in the work area and located near the edge of the downhole (3). The scraper cleaning machine (23) is used to spray high-pressure water onto the scraper (32) to clean the scraper (32).

5. A long-distance ultra-deep drilling dual-power slag removal system according to claim 4, characterized in that, The rigid section (37) is made of an alloy plate, and the flexible section (38) is made of a rubber plate.

6. The dual-power slag removal system for long-distance ultra-deep drilling as described in claim 5, characterized in that, It also includes a remote controller, which is connected to the controller (41) via a wireless communication module (42); the controller (41) is a PLC controller.

7. A method for dual-power muck removal in long-distance ultra-deep drilling, employing the dual-power muck removal system for long-distance ultra-deep drilling as described in claim 6, characterized in that... Specifically, the following steps are included: Step 1: Assemble the drilling unit, and arrange the water injection unit, the first slag removal mechanism and the belt conveyor (21). S11: Two hydraulic cylinders (26) are symmetrically connected to the bottom of the two bottom vertical grooves (48) on the tail drill rod (45) using two mounting brackets (49). Two support frames (17) are symmetrically connected to the two hydraulic cylinders (26). Two driven sprockets (28) are then connected to the two support frames (17) respectively. Next, the middle part of the two transmission chains (30) connected with scraper (32) is wound around the two driven sprockets (28). At the same time, the two ends of each transmission chain (30) are temporarily fixed to the top of the bottom vertical groove (48) through the transition bracket. S12: Connect the drill bit (4) to the end of the tail drill rod (45) and connect the head of the tail drill rod (45) to the power head (29) on the drilling machine (1); S13: Install the water tank (8) and the water pump (7) in the work area, and connect the water pump (7) and the water tank (8) using the first high-pressure hose (13), and connect the water pump (7) and the rotary joint on the power head (29) using the second high-pressure hose (14); Install the slurry collection tank (19), slurry separation tank (11) and slurry pump (10) in the work area, and connect the slurry separation tank (11) and slurry collection tank (19) with high pressure hose four (24), connect the slurry pump (10) and slurry separation tank (11) with high pressure hose five (25), and connect the outlet end of high pressure hose three (20) to the inlet of slurry pump (10); Arrange the belt conveyor (21) in the area to be worked, and position it below the slurry separator (11), while positioning its feed end at the edge of the downward borehole (3) to be drilled; Step 2: Construction of the downhole (3); S21: First, use the drilling rig (1) to drive the tail drill rod (45) to perform drilling operations in the coal seam (12) to drill the downward borehole (3). During the drilling process, turn on the water injection unit and use the water injection pump (7) to supply cooling water to the rotary joint on the power head (29) through the high pressure hose (14). The cooling water flows through the water injection channel inside the rotary joint into the water injection channel (5) in the tail drill rod (45) and flows to the drill bit (4) to perform online cooling operations on the drill bit (4). S22: As the drilling depth increases, multiple intermediate drill rods (44) are cascaded sequentially at the upper end of the tail drill rod (45), and two transmission chains (30) are connected sequentially during the cascading process. At the same time, the two ends of each transmission chain (30) after the connection are temporarily fixed to the top of the vertical groove (47) in the middle of the uppermost intermediate drill rod (44) after cascading through transition brackets. Finally, the head drill rod (43) is connected to the upper end of the uppermost intermediate drill rod (44) to form a customized drill rod (2), and then symmetrically connected to the top of the two top vertical grooves (46) on the head drill rod (43). Connect two hydraulic cylinders (26), symmetrically connect two support frames (17) to the two hydraulic cylinders (26), then connect two drive sprockets (18) to the two support frames (17) respectively, and symmetrically connect two material feeding brackets (33) to the two support frames (17), connect material feeding impellers (34) to the two material feeding brackets (33), then continue to connect two transmission chains (30), and make the two transmission chains (30) after the continuation close on the two drive sprockets (18), forming two closed transmission chains (30) on both sides of the custom drill rod (2). S23: After the downhole (3) reaches the predetermined drilling depth A, if the water accumulation in the hole exceeds the preset upper limit height A, proceed to step three; Step 3: Perform slurry and slag removal operations; First, stop the drilling operation of the custom drill rod (2) and the water injection operation of the water injection unit. Then, extend the inlet end of the high pressure hose three (20) into the bottom of the downhole (3). Simultaneously, start the first slag discharge mechanism and the belt conveyor (21). Use the slurry pump (10) to extract part of the slurry accumulated at the bottom of the borehole through the high pressure hose three (20) and transport it to the slurry separation box (11) to reduce drilling resistance. At the same time, use the slurry separation box (11) to separate the coal slag in the slurry and discharge the coal slag to the bearing section of the belt conveyor (21) through the slag discharge port (39). Simultaneously, use the running belt conveyor (21) to transport the coal slag to the set area. When the water accumulation in the hole is lower than the preset lower limit height B, remove the high pressure hose three (20) from the hole and then execute step four. Step 4: Repeat steps 2 and 3. During step 2, the torque sensor (27) is used to collect the torque signal of the customized drill rod (2) in real time and send it to the controller (41) in real time. The controller (41) obtains the torque value based on the received torque signal and then sends the obtained torque value to the display terminal for real-time display through the wireless communication module (42). When the torque value exceeds the set value C, step 5 is executed. Otherwise, steps 2 and 3 are repeated until the predetermined drilling depth B is reached, at which point the process ends and step 6 is executed. Step 5: Perform slag removal operation; First, stop the drilling operation of the custom drill rod (2) and the water injection operation of the water injection unit, and adjust the angle of the custom drill rod (2) so that one of the vertical grooves (15) faces the belt conveyor (21). Then, use the remote control to send a wireless control signal A to the controller (41). When the controller (41) receives the wireless control signal A, it controls the power module to perform action A, so that the two hydraulic cylinders (26) in each second slag discharge mechanism (16) extend synchronously to the maximum displacement state, and start the drive motor (31) and the feeding motor (35) to start running, so that the multiple scrapers (32) on the outer side move from bottom to top, and the feeding impeller (34) drives the feeding plate (36) to rotate. During this process, the multiple scrapers (32) moving from bottom to top are used to remove the slag accumulated in the hole. The bottom slag is gradually carried away towards the orifice, and the flexible section (38) of the material feeding plate (36) is used to push the scraper (32) moved to the top, so as to throw the slag on the transverse section of the scraper (32) towards the outside of the orifice. Simultaneously, the bearing section of the belt conveyor (21) is used to receive the thrown slag and transport it to the set area. When the slag on the scraper (32) continues to decrease, the remote controller sends a wireless control signal B to the controller (41). When the controller (41) receives the wireless control signal B, it controls the power module to perform action B, so that the two hydraulic cylinders (26) in each second slag discharge mechanism (16) retract synchronously to the maximum displacement state, and the drive motor (31) and the material feeding motor (35) stop running. Then, step four is executed. Step Six: End drilling operation; Remove the water tank (8), water injection pump (7), slurry collection tank (19), slurry separation tank (11), slurry discharge pump (10) and belt conveyor (21) from the work area, and then use the drilling rig (1) to drive the custom drill rod (2) away from the downhole (3).

8. The method for dual-power slag removal in long-distance ultra-deep drilling according to claim 7, characterized in that, In step five, before sending wireless control signal A to the controller (41) using a remote control, a slag collection box with an open top is placed on the opposite side of the belt conveyor (21).

9. A method for dual-power slag removal in long-distance ultra-deep drilling according to claim 8, characterized in that, In step six, the scraper cleaning machine (23) is started first, and the high-pressure water jet sprayed by the scraper cleaning machine (23) is used to clean the scraper (32) in the second slag discharge mechanism (16). Then, the drill (1) is used to drive the customized drill rod (2) away from the downward drill hole (3).

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