Coal seam ultrasonic activation segmented fracturing device and method

Abstract

The application discloses a coal seam ultrasonic activation segmented fracturing device and method, relates to the field of coal seam ultrasonic activation segmented fracturing, and comprises a drill rod, the drill rod is in a cylindrical structure, and a drill bit, a fracturing mechanism, an adjusting mechanism, an ultrasonic activation mechanism and a pipeline are arranged on the drill rod. In the application, the end of the drill rod is provided with the drill bit for drilling in the coal seam, so that the drill rod can conveniently extend into the coal seam; when the drill rod extends into the coal seam, the fracturing mechanism is pressurized by using the pipeline; after the pressure is transmitted to the coal seam, the coal seam is fractured; when the coal seam is fractured, the ultrasonic waves generated by the ultrasonic activation mechanism also act on the coal seam, so that the coal seam becomes loose; the pipeline is connected to the end of the drill rod, so that the drill rod can extend into the coal seam for drilling, the drilling depth is increased, the adjusting mechanism can adjust the drilling direction of the drill bit, the position of the drill rod in the coal seam is facilitated to be controlled, and the construction cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of ultrasonic activation segmented fracturing of coal seams, and particularly to an ultrasonic activation segmented fracturing device and method for coal seams. Background Technology

[0002] Coalbed methane, also known as coal seam gas, is a hazardous gas that causes gas disasters in coal mines. It is also a clean energy source found in coal seams and associated with coal. With increasing mining depth, coalbed methane pressure rises, ground stress conditions become more complex, and coal seam permeability decreases, making gas desorption during extraction difficult and severely impacting normal continuous production and personnel safety in coal mines. To improve gas extraction efficiency, it is necessary to increase coal seam permeability. To address this, a segmented fracturing technology based on directional long boreholes has been gradually adopted. This technology involves setting up drilling sites in the floor or roof roadways, drilling directional long boreholes in hard coal and the roof and floor, and using packers to achieve segmented fracturing. However, this long-bore segmented fracturing technology requires high coal seam hardness. Drilling long boreholes in soft coal can lead to borehole collapse and drill bit jamming, making segmented fracturing impossible. For soft coal seams, a segmented fracturing approach using long boreholes in the roof and floor is typically employed. This allows the fractures generated in the hard rock to extend into the coal seam, thus providing a pathway for gas movement. However, when drilling into rock strata, the location of the borehole directly affects the extension of the fracturing fractures, potentially preventing them from reaching the coal seam and reducing the overall fracturing effectiveness.

[0003] Chinese patent CN202210282249.0 discloses a coal seam ultrasonic activation segmented fracturing device, comprising: a pipe fitting, a portion of which extends into a coal seam borehole; at least two ball-launching sleeves connected in series at the end of the pipe fitting extending into the borehole; each ball-launching sleeve has a first fluid passage, a second fluid passage, an ultrasonic vibrator, and a power supply; the ball-launching sleeve has an initial state and a mating state; each ball-launching sleeve is equipped with a fracturing ball, which blocks the first fluid passage after entering the mating ball-launching sleeve; the ball-launching sleeve is equipped with a limiting element, which restricts the ball-launching sleeve to the initial state; after the first fluid passage is blocked, the limiting element fails, and the ball-launching sleeve switches from the initial state to the mating state; when the ball-launching sleeve is in the initial state, the first fluid passage allows fracturing fluid to flow and allows the fracturing ball of the downstream ball-launching sleeve to pass through; when the ball-launching sleeve is in the mating state, the second fluid passage allows fracturing fluid to flow.

[0004] However, its working process includes drilling into the coal seam, charging the battery, sealing the borehole, fracturing, ultrasonic vibration, and thermal effects accelerating the chemical reaction to generate sodium carbonate solution, oxygen, and water. A large number of bubbles are generated and enter the coal seam borehole with the fracturing fluid under water pressure, where they synergistically induce fracturing under ultrasonic cavitation. However, the entire process is time-consuming.

[0005] Furthermore, the battery needs to be charged each time, and the coal seam needs to be drilled and sealed before each operation. The construction period is long and the cost is high.

[0006] Therefore, it is necessary to propose a coal seam ultrasonic activation segmented fracturing device and method to solve the above problems. Summary of the Invention

[0007] The purpose of this invention is to provide a coal seam ultrasonic activation segmented fracturing device and method to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a coal seam ultrasonic activation segmented fracturing device, comprising a drill rod, the drill rod having a cylindrical structure, and a drill bit, a fracturing mechanism, an adjustment mechanism, an ultrasonic activation mechanism, and a pipe disposed on the drill rod. The drill bit is disposed at the end of the drill rod and is used to drill in the coal seam. The fracturing mechanism is used to pressurize the coal seam to fracture it. The ultrasonic activation mechanism is used to generate ultrasonic waves to assist in the fracturing of the coal seam. Both the fracturing mechanism and the ultrasonic activation mechanism are disposed in the middle of the drill rod. The adjustment mechanism is provided in two sets, each set being disposed at the end of the drill rod. The adjustment mechanism is used to adjust the direction of the drill bit's drilling in the coal seam. The pipe is disposed inside the drill rod, with one end of the pipe extending movably out of the drill rod away from the end face of the drill bit.

[0009] Preferably, a partition is provided inside the drill rod at the end near the drill bit, which divides the drill rod into a secondary chamber near the drill bit and a main chamber away from the drill bit. A motor is provided in the secondary chamber, and a motor shaft is drivenly connected to the end of the motor. The motor shaft extends movably out of the end face of the drill rod, and the position of the motor shaft extending movably out of the end of the drill rod is fixedly connected to the drill bit. A GPS positioning chip is also installed in the secondary chamber.

[0010] In this invention, a drill bit for drilling into the coal seam is provided at the end of the drill rod, making it easy for the drill rod to extend into the coal seam. When the drill rod extends into the coal seam, pressure is applied to the fracturing mechanism through a pipeline. After the pressure is transmitted to the coal seam, the coal seam is fractured. When the coal seam is fractured, the ultrasonic waves generated by the ultrasonic activation mechanism also act on the coal seam, making the coal seam loose. Because the drill rod is connected to the pipeline at the end, the drill rod can extend into the coal seam for drilling, thereby increasing the drilling depth. The adjustment mechanism can adjust the drilling direction of the drill bit, making it easier to control the position of the drill rod in the coal seam. This replaces the existing technology where the drill rod can only extend into the coal seam to a certain depth for ultrasonic activation and segmented fracturing.

[0011] When the motor starts, it drives the drill bit to rotate and drill into the coal seam. As the drill bit drills into the coal seam, the drill rod extends into the coal seam. When the drill rod reaches a suitable position in the coal seam, the medium is injected into the pipeline to pressurize it. The seventh solenoid valve opens, and the medium enters the pressure chamber through the connecting pipeline. When the medium in the pressure chamber reaches a certain pressure, the elastic explosion-proof metal sheet ruptures at the position of the cross hole under the ultimate pressure, so that the medium is quickly forced into the coal seam from the release hole, thus achieving the purpose of fracturing the coal seam.

[0012] Preferably, a wire is provided in the pipe, and one end of the wire is connected to a motor.

[0013] The wires are used to connect the power source and supply power to the motor; the wires have an outer insulating layer.

[0014] Preferably, the fracturing mechanism includes a pressure box, a pressure chamber, a release hole, and an elastic explosion-proof metal sheet. The pressure box is fixedly installed on the inner wall of the drill pipe. The pressure chamber is located between the inner wall of the pressure box and the inner wall of the drill pipe. The release hole is located on the outer ring of the drill pipe and connects the outside of the drill pipe and the pressure chamber. The elastic explosion-proof metal sheet is fixedly installed in the release hole. A cross hole is provided in the middle of the elastic explosion-proof metal sheet. The pipe is connected to the pressure chamber through a connecting pipe, and a seventh solenoid valve is installed in the connecting pipe.

[0015] Preferably, the ultrasonic activation mechanism includes an ultrasonic generator and a housing. The housing is fixedly mounted on the inner wall of the drill pipe, the ultrasonic generator is located inside the housing, and the housing is filled with liquid.

[0016] After the coal seam is fractured, the ultrasonic generator is activated, transmitting ultrasonic waves into the fractured coal seam to further loosen it, thus achieving the purpose of ultrasonic activation of the coal seam.

[0017] Because the drill rod can advance continuously in the coal seam, there is no need for multiple positioning and drilling, which improves construction efficiency. As the drill rod advances in the coal seam, it can be fracturing the coal seam at appropriate intervals, making it highly practical.

[0018] Preferably, the adjusting mechanism includes a control box, a spring, a push plate, a push groove, a connecting rod, and a pressure push plate. The control box is fixedly mounted on the inner wall of the drill rod. The pressure push plate is slidably mounted inside the control box. The side of the pressure push plate away from the pipe is fixedly connected to the connecting rod. The end of the connecting rod away from the pressure push plate moves through the outer surface of the control box. The push groove is located at the outer ring of the drill rod and connects the inside and outside of the drill rod. The push plate is movably mounted in the push groove. The side of the push plate near the control box is fixedly connected to the end of the connecting rod. One end of the spring is fixedly welded to the side of the pressure push plate near the connecting rod, and the other end of the spring is fixedly welded to the inner wall of the control box on the side away from the pipe. The side of the pressure push plate near the pipe and the inside of the control box form a pressure accumulator chamber. A first docking pipe is fixedly connected to the side of the control box near the pipe. A second docking pipe is fixedly mounted at the outer ring of the pipe. The first docking pipe and the second docking pipe are docked. A sixth solenoid valve is installed in the second docking pipe. The pressure accumulator chamber communicates with the first docking pipe, and the second docking pipe communicates with the inside of the pipe.

[0019] When adjusting the drilling direction of the drill bit in the coal seam, the corresponding sixth solenoid valve can be opened, allowing the medium in the pipeline to enter the accumulator chamber. The medium pushes the pressure push plate to move away from the pipeline, causing the push plate to extend out of the push groove, thus pushing against the internal structure of the coal seam. Adjusting the push plates at different positions on the outer ring of the drill rod controls the overall drilling direction of the drill bit. The GPS positioning chip can be used to monitor the position of the drill rod in the coal seam, facilitating control and making it convenient to use.

[0020] Preferably, a first vent hole is provided on one side of the control box, and a fourth solenoid valve is provided in the first vent hole. The first vent hole connects the pressure accumulator chamber and the outside of the control box. A second vent hole is provided at the end of the drill rod away from the drill bit. The second vent hole connects the inside and outside of the drill rod, and a fifth solenoid valve is provided in the second vent hole.

[0021] To enable the push plate to reset, a fourth solenoid valve is installed in the first vent hole. When the fourth solenoid valve is opened, the medium in the accumulator chamber can be released into the main chamber. After the pressure of the medium in the accumulator chamber is lost, the spring pushes the pressure push plate to reset. When the pressure push plate resets, it is held in place by the connecting rod. In order to avoid the medium pressure in the accumulator chamber being too high, a second vent hole is installed at the end of the drill rod. When the fifth solenoid valve is opened, the excess medium in the accumulator chamber can be released.

[0022] Preferably, multiple sets of control boxes are arranged along the inner wall of the drill pipe, and the multiple sets of control boxes are distributed at equal angles.

[0023] Preferably, a high-pressure pump is connected to one end of the pipe extending from the drill rod. A water tank, an oil tank, and a gas tank are respectively connected to the high-pressure pump. A first solenoid valve, a second solenoid valve, and a third solenoid valve are respectively installed at the positions where the water tank, oil tank, and gas tank are connected to the high-pressure pump.

[0024] The high-pressure pump can deliver the medium into the pipeline. In this invention, the medium is used to adjust the drilling direction of the drill bit, and the medium is also used to perform ultrasonic activation and segmented fracturing of the coal seam. After the medium fractures the coal seam, it is uniformly dispersed in the coal seam structure, which is more conducive to the transmission of ultrasonic waves generated by the ultrasonic generator, thereby loosening the coal seam.

[0025] In this invention, one of three media can be selected as needed: water, oil, and air;

[0026] When water is selected, simply open the first solenoid valve. The high-pressure pump will draw the water stored in the tank into the pipeline, resulting in lower costs when using water.

[0027] When selecting the oil, simply open the second solenoid valve. The high-pressure pump will draw the oil stored in the tank into the pipeline. When using the oil, it can better fill and remain in the coal seam, promoting subsequent ultrasonic activation.

[0028] When air is selected, simply open the third solenoid valve. The high-pressure pump will draw the air stored in the gas tank into the pipeline. This method is low-cost and the air has stronger diffusion properties, making it easier to fracture the coal seam.

[0029] The present invention also discloses an ultrasonically activated segmented fracturing method, comprising the ultrasonically activated segmented fracturing device for coal seams as described in any of the above, and further comprising the following method:

[0030] S1: Continuous drilling. When the motor starts, it drives the drill bit to rotate and drills into the coal seam. At the same time, the drill rod extends into the coal seam. When adjusting the drilling direction of the drill bit in the coal seam, the corresponding sixth solenoid valve can be opened, allowing the medium in the pipeline to enter the accumulator chamber. The medium pushes the pressure push plate to move away from the pipeline, thereby causing the push plate to extend out of the push groove, which serves to push against the internal structure of the coal seam. Adjusting the push plates at different positions on the outer ring of the drill rod controls the overall drilling direction of the drill bit. The GPS positioning chip can be used to monitor the position of the drill rod in the coal seam for easy control. Since the pipeline is connected to the drill rod, the drill rod can drill continuously in the coal seam. As the drill rod advances in the coal seam, it can fracture the coal seam at appropriate intervals.

[0031] S2: Fracturing. When the drill pipe reaches a suitable position in the coal seam, the medium is injected into the pipeline to pressurize it. The seventh solenoid valve opens, and the medium enters the interior of the pressure chamber through the connecting pipeline. When the medium in the pressure chamber reaches a certain pressure, the elastic explosion-proof metal sheet breaks from the position of the cross hole under the ultimate pressure, so that the medium is quickly forced into the coal seam from the release hole, thus achieving the purpose of fracturing the coal seam.

[0032] S3: Ultrasonic activation. After the medium is crushed, it is uniformly dispersed in the coal seam structure, which is more conducive to the transmission of ultrasonic waves generated by the ultrasonic generator in the coal seam, thereby comprehensively loosening and activating the coal seam.

[0033] The technical effects and advantages of this invention are as follows:

[0034] 1. In this invention, a drill bit for drilling in the coal seam is provided at the end of the drill rod, making it easy for the drill rod to extend into the coal seam. When the drill rod extends into the coal seam, pressure is applied to the fracturing mechanism through the pipeline. After the pressure is transmitted to the coal seam, the coal seam is fractured. When the coal seam is fractured, the ultrasonic waves generated by the ultrasonic activation mechanism also act on the coal seam, making the coal seam loose. Since the drill rod is connected to the pipeline at the end, the drill rod can extend into the coal seam for drilling, thereby increasing the drilling depth. The adjustment mechanism can adjust the drilling direction of the drill bit, making it easy to control the position of the drill rod in the coal seam. This replaces the existing technology where the drill rod can only extend into the coal seam to a certain depth for ultrasonic activation and segmented fracturing, thus reducing construction costs.

[0035] 2. After the coal seam is fractured, the ultrasonic generator is activated. The ultrasonic generator transmits ultrasonic waves to the fractured coal seam, which further loosens the coal seam and achieves the purpose of ultrasonic activation of the coal seam.

[0036] 3. Since the drill rod can advance continuously in the coal seam, there is no need for multiple positioning and drilling, which improves construction efficiency. As the drill rod advances continuously in the coal seam, it can be fracturing once every appropriate distance, which is highly practical.

[0037] 4. The high-pressure pump can deliver the medium into the pipeline. In this invention, the medium is used to adjust the drilling direction of the drill bit, and the medium is also used to perform ultrasonic activation and segmented fracturing of the coal seam. After the medium fractures the coal seam, it is uniformly dispersed in the coal seam structure, which is more conducive to the transmission of ultrasonic waves generated by the ultrasonic generator, thereby loosening the coal seam. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the structure of the ultrasonic activation segmented fracturing device for coal seams according to the present invention.

[0039] Figure 2 This is a schematic diagram of the adjustment mechanism of the present invention.

[0040] Figure 3 This is a schematic diagram of the fracturing mechanism of the present invention.

[0041] Figure 4 This is a schematic diagram of the drill bit structure of the present invention.

[0042] Figure 5 For the present invention Figure 2 Enlarged schematic diagram of the structure at point A in the middle.

[0043] Figure 6 For the present invention Figure 3 Enlarged schematic diagram of the structure at point B.

[0044] Figure 7 This is a schematic diagram of the elastic explosion-proof metal sheet structure of the present invention.

[0045] Figure 8 This is a schematic diagram of the structure of the ultrasonic activation segmented fracturing device for coal seams of the present invention applied to a coal seam.

[0046] In the diagram: 1. Drill rod; 2. Drill bit; 3. Fracturing mechanism; 4. Adjustment mechanism; 5. Ultrasonic activation mechanism; 6. Pipeline; 7. Coal seam; 8. High-pressure pump; 9. Water tank; 10. Oil tank; 11. Gas tank; 12. First solenoid valve; 13. Second solenoid valve; 14. Third solenoid valve; 15. Push plate; 16. Push groove; 17. Spring; 18. Connecting rod; 19. Pressure push plate; 20. Fourth solenoid valve; 21. First vent hole; 22. Wire; 23. Second vent hole; 24. Fifth solenoid valve; 25. Pressure chamber; 26. Pressure box; 27. Release hole; 28. Control box; 29. ​​Housing; 30. Ultrasonic generator; 31. Main chamber; 32. Motor; 33. GPS positioning chip; 34. Secondary chamber; 35. Partition plate; 36. Motor shaft; 37. Accumulation chamber; 38. First docking pipe; 39. Second docking pipe; 40. Sixth solenoid valve; 41. Elastic explosion-proof metal sheet; 42. Cross hole; 43. Connecting pipe; 44. Seventh solenoid valve. Detailed Implementation

[0047] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] This invention provides, for example Figures 1-8The illustrated coal seam ultrasonic activation segmented fracturing device includes a drill rod 1, which has a cylindrical structure. The drill rod 1 is equipped with a drill bit 2, a fracturing mechanism 3, an adjustment mechanism 4, an ultrasonic activation mechanism 5, and a pipe 6. The drill bit 2 is located at the end of the drill rod 1 and is used to drill into the coal seam 7. The fracturing mechanism 3 is used to pressurize the coal seam 7 so that the coal seam 7 is fractured. The ultrasonic activation mechanism 5 is used to generate ultrasonic waves to assist in the fracturing of the coal seam 7. Both the fracturing mechanism 3 and the ultrasonic activation mechanism 5 are located in the middle of the drill rod 1. Two sets of adjustment mechanisms 4 are provided, and the two sets of adjustment mechanisms 4 are respectively located at the ends of the drill rod 1. The adjustment mechanisms 4 are used to adjust the drilling direction of the drill bit 2 in the coal seam 7. The pipe 6 is located inside the drill rod 1, and one end of the pipe 6 extends movably out of the end face of the drill rod 1 away from the drill bit 2.

[0049] A partition 35 is provided inside the drill rod 1 near the drill bit 2. The partition 35 divides the inside of the drill rod 1 into a secondary chamber 34 near the drill bit 2 and a main chamber 31 away from the drill bit 2. A motor 32 is provided in the secondary chamber 34. A motor shaft 36 is connected to the end of the motor 32. The motor shaft 36 extends movably out of the end face of the drill rod 1. The position of the motor shaft 36 extending movably out of the end of the drill rod 1 is fixedly connected to the drill bit 2. A GPS positioning chip 33 is also installed in the secondary chamber 34.

[0050] In this invention, a drill bit 2 for drilling into the coal seam 7 is provided at the end of the drill rod 1, making it easy for the drill rod 1 to extend into the coal seam 7. When the drill rod 1 extends into the coal seam 7, pressure is applied to the fracturing mechanism 3 through the pipe 6. After the pressure is transmitted to the coal seam 7, the coal seam 7 is fractured. When the coal seam 7 is fractured, the ultrasonic waves generated by the ultrasonic activation mechanism 5 also act on the coal seam 7, making the coal seam 7 loose. Since the drill rod 1 is connected to the pipe 6 at the end, the drill rod 1 can extend into the coal seam 7 for drilling, thereby increasing the drilling depth. In addition, the adjustment mechanism 4 can adjust the drilling direction of the drill bit 2, making it easier to control the position of the drill rod 1 in the coal seam 7. This replaces the method in the prior art where the drill rod 1 can only extend into the coal seam 7 to a certain depth for ultrasonic activation and segmented fracturing of the coal seam 7.

[0051] When motor 32 starts, it drives drill bit 2 to rotate and drill into coal seam 7. Simultaneously, drill rod 1 extends into coal seam 7. When drill rod 1 reaches a suitable position in coal seam 7, medium is injected into pipe 6 to pressurize it. The seventh solenoid valve 44 opens, and the medium enters the pressure chamber 25 through connecting pipe 43. When the medium in pressure chamber 25 reaches a certain pressure, the elastic explosion-proof metal sheet 41 ruptures from the position of cross hole 42 under extreme pressure, so that the medium is quickly forced into coal seam 7 from release hole 27, achieving the purpose of fracturing coal seam 7.

[0052] A wire 22 is installed in the pipe 6, and one end of the wire 22 is connected to the motor 32.

[0053] The wire 22 is used to connect the power supply and supply power to the motor 32. The wire 22 has an outer insulating layer.

[0054] The fracturing mechanism 3 includes a pressure box 26, a pressure chamber 25, a release hole 27, and an elastic explosion-proof metal sheet 41. The pressure box 26 is fixedly installed on the inner wall of the drill rod 1. The pressure chamber 25 is located between the inner wall of the pressure box 26 and the inner wall of the drill rod 1. The release hole 27 is located on the outer ring of the drill rod 1 and connects the outside of the drill rod 1 and the pressure chamber 25. The elastic explosion-proof metal sheet 41 is fixedly installed in the release hole 27. A cross hole 42 is provided in the middle of the elastic explosion-proof metal sheet 41. The pipe 6 is connected to the pressure chamber 25 through a connecting pipe 43. A seventh solenoid valve 44 is provided in the connecting pipe 43.

[0055] The ultrasonic activation mechanism 5 includes an ultrasonic generator 30 and a housing 29. The housing 29 is fixedly installed on the inner wall of the drill rod 1, and the ultrasonic generator 30 is installed inside the housing 29. The housing 29 is filled with liquid.

[0056] After the coal seam 7 is fractured, the ultrasonic generator 30 is activated. The ultrasonic generator 30 transmits ultrasonic waves to the fractured coal seam 7, which further loosens the coal seam 7 and achieves the purpose of ultrasonic activation of the coal seam 7.

[0057] Since drill rod 1 can continuously advance in coal seam 7, there is no need for multiple positioning and drilling, which improves construction efficiency. As drill rod 1 continues to advance in coal seam 7, it can be fracturing once every appropriate distance in coal seam 7, which is highly practical.

[0058] The adjusting mechanism 4 includes a control box 28, a spring 17, a push plate 15, a push groove 16, a connecting rod 18, and a pressure push plate 19. The control box 28 is fixedly mounted on the inner wall of the drill rod 1. The pressure push plate 19 is slidably mounted inside the control box 28. The side of the pressure push plate 19 away from the pipe 6 is fixedly connected to the connecting rod 18. The end of the connecting rod 18 away from the pressure push plate 19 moves through the outer surface of the control box 28. The push groove 16 is located at the outer ring of the drill rod 1, connecting the inside and outside of the drill rod 1. The push plate 15 is movably mounted in the push groove 16. The side of the push plate 15 near the control box 28 is fixedly connected to the end of the connecting rod 18. The spring 17... One end of the spring 17 is fixedly welded to the side of the pressure push plate 19 near the connecting rod 18, and the other end of the spring 17 is fixedly welded to the inner wall of the control box 28 away from the pipe 6. The side of the pressure push plate 19 near the pipe 6 and the inside of the control box 28 form a pressure accumulator chamber 37. The side of the control box 28 near the pipe 6 is fixedly connected to the first docking pipe 38. The outer ring of the pipe 6 is fixedly provided with the second docking pipe 39. The first docking pipe 38 and the second docking pipe 39 are docked. The second docking pipe 39 is provided with the sixth solenoid valve 40. The pressure accumulator chamber 37 is connected to the first docking pipe 38, and the second docking pipe 39 is connected to the inside of the pipe 6.

[0059] When adjusting the drilling direction of drill bit 2 in coal seam 7, the corresponding sixth solenoid valve 40 can be opened, allowing the medium in pipeline 6 to enter the accumulator chamber 37. The medium pushes the pressure push plate 19 to move away from pipeline 6, thereby causing the push plate 15 to extend out of the push groove 16, which serves to push against the internal structure of coal seam 7. By adjusting the push plates 15 at different positions on the outer ring of drill rod 1, the overall drilling direction of drill bit 2 can be controlled. The GPS positioning chip 33 can be used to monitor the position of drill rod 1 in coal seam 7, which is convenient for control and easy to use.

[0060] A first vent 21 is provided on one side of the control box 28. A fourth solenoid valve 20 is provided in the first vent 21. The first vent 21 connects the pressure accumulator chamber 37 and the outside of the control box 28. A second vent 23 is provided at the end of the drill rod 1 away from the drill bit 2. The second vent 23 connects the inside and outside of the drill rod 1. A fifth solenoid valve 24 is provided in the second vent 23.

[0061] To enable the push plate 15 to reset, a fourth solenoid valve 20 is provided in the first vent hole 21. When the fourth solenoid valve 20 is opened, the medium in the accumulator chamber 37 can be released into the main chamber 31. After the pressure of the medium in the accumulator chamber 37 is lost, the spring 17 pushes the pressure push plate 19 to reset. When the pressure push plate 19 resets, the push plate 15 is pulled back to reset by the connecting rod 18. In order to avoid the medium pressure in the accumulator chamber 37 being too high, a second vent hole 23 is provided at the end of the drill rod 1. When the fifth solenoid valve 24 is opened, the excess medium in the accumulator chamber 37 can be released.

[0062] Multiple control boxes 28 are arranged along the inner wall of the drill rod 1, and the multiple control boxes 28 are distributed at equal angles.

[0063] One end of the pipe 6 extending out of the drill rod 1 is connected to a high-pressure pump 8. A water tank 9, an oil tank 10, and an air tank 11 are connected to the high-pressure pump 8. A first solenoid valve 12, a second solenoid valve 13, and a third solenoid valve 14 are respectively installed at the positions where the water tank 9, oil tank 10, and air tank 11 are connected to the high-pressure pump 8.

[0064] The high-pressure pump 8 can deliver the medium into the pipeline 6. In this invention, the medium is used to adjust the drilling direction of the drill bit 2, and the medium is also used to perform ultrasonic activation and segmented fracturing of the coal seam 7. After the medium fractures the coal seam 7, it is uniformly dispersed in the coal seam 7 layer structure, which is more conducive to the transmission of ultrasonic waves generated by the ultrasonic generator 30, thereby loosening the coal seam 7.

[0065] In this invention, one of three media can be selected as needed: water, oil, and air;

[0066] When water is selected, simply open the first solenoid valve 12. The high-pressure pump 8 will pump the water stored in the water tank 9 into the pipe 6, resulting in lower costs when using water.

[0067] When oil is selected, the second solenoid valve 13 is opened, and the high-pressure pump 8 draws the oil stored in the oil tank 10 into the pipeline 6. When using the oil, it can better fill and stay in the coal seam 7, promoting subsequent ultrasonic activation.

[0068] When air is selected, simply open the third solenoid valve 14. The high-pressure pump 8 will draw the air stored in the gas tank 11 into the pipeline 6. This method is low-cost and the air has stronger diffusion properties, making it easier to fracture the coal seam 7.

[0069] This invention also discloses an ultrasonically activated segmented fracturing method, including any of the above-mentioned ultrasonically activated segmented fracturing devices for coal seams, and further including the following method:

[0070] S1: Continuous drilling. When the motor 32 starts, the motor 32 drives the drill bit 2 to rotate. The drill bit 2 drills in the coal seam 7. At the same time as the drill bit 2 drills in the coal seam 7, the drill rod 1 extends into the coal seam 7. When adjusting the drilling direction of the drill bit 2 in the coal seam 7, the corresponding sixth solenoid valve 40 can be opened, so that the medium in the pipeline 6 enters the pressure accumulator chamber 37. The medium pushes the pressure push plate 19 to move away from the pipeline 6, so that the push plate 15 extends out of the push groove 16, which serves to push against the internal structure of the coal seam 7. Adjusting the push plate 15 at different positions on the outer ring of the drill rod 1 controls the overall drilling direction of the drill bit 2. The GPS positioning chip 33 can be used to monitor the position of the drill rod 1 in the coal seam 7 for easy control. Since the pipeline 6 is connected to the drill rod 1, the drill rod 1 can drill continuously in the coal seam 7. As the drill rod 1 advances in the coal seam 7, it can be fractured once every appropriate distance in the coal seam 7.

[0071] S2: Fracturing. When the drill rod 1 reaches a suitable position in the coal seam 7, the medium is injected into the pipeline 6 to pressurize it. The seventh solenoid valve 44 is opened, and the medium enters the interior of the pressure chamber 25 through the connecting pipeline 43. When the medium in the pressure chamber 25 reaches a certain pressure, the elastic explosion-proof metal sheet 41 ruptures from the position of the cross hole 42 under the ultimate pressure, so that the medium is quickly forced into the coal seam 7 from the release hole 27, thus achieving the purpose of fracturing the coal seam 7.

[0072] S3: Ultrasonic activation. After the medium is crushed, the coal seam 7 is uniformly dispersed in the coal seam 7 structure, which is more conducive to the transmission of ultrasonic waves generated by the ultrasonic generator 30 in the coal seam 7, thereby comprehensively loosening and activating the coal seam 7.

Claims

1. A coal seam ultrasonic activation segmented fracturing device, comprising a drill pipe (1), characterized in that: The drill rod (1) has a cylindrical structure. The drill rod (1) is equipped with a drill bit (2), a fracturing mechanism (3), an adjustment mechanism (4), an ultrasonic activation mechanism (5), and a pipe (6). The drill bit (2) is located at the end of the drill rod (1) and is used to drill in the coal seam (7). The fracturing mechanism (3) is used to pressurize the coal seam (7) so that the coal seam (7) is fractured. The ultrasonic activation mechanism (5) is used to generate ultrasonic waves, and the ultrasonic waves assist the coal seam (7) in being fractured. The fracturing mechanism (3) and the ultrasonic activation mechanism (5) are both located in the middle of the drill rod (1). The adjustment mechanism (4) is provided in two sets. The two sets of adjustment mechanisms (4) are respectively located at the end of the drill rod (1). The adjustment mechanism (4) is used to adjust the direction of the drill bit (2) drilling in the coal seam (7). The pipe (6) is located inside the drill rod (1). One end of the pipe (6) extends out of the end face of the drill rod (1) away from the drill bit (2). The drill rod (1) has a partition (35) inside the end near the drill bit (2). The partition (35) divides the inside of the drill rod (1) into a secondary chamber (34) near the drill bit (2) and a main chamber (31) away from the drill bit (2). A motor (32) is installed in the secondary chamber (34). A motor shaft (36) is connected to the end of the motor (32). The motor shaft (36) extends movably out of the end face of the drill rod (1). The position of the motor shaft (36) extending movably out of the end of the drill rod (1) is fixedly connected to the drill bit (2). A GPS positioning chip (33) is also installed in the secondary chamber (34).

2. The ultrasonically activated segmented fracturing device for coal seams according to claim 1, characterized in that: A wire (22) is installed in the pipe (6), and one end of the wire (22) is connected to the motor (32).

3. The ultrasonically activated segmented fracturing device for coal seams according to claim 1, characterized in that: The fracturing mechanism (3) includes a pressure box (26), a pressure chamber (25), a release hole (27), and an elastic explosion-proof metal sheet (41). The pressure box (26) is fixedly installed on the inner wall of the drill rod (1). The pressure chamber (25) is located between the inner wall of the pressure box (26) and the inner wall of the drill rod (1). The release hole (27) is located on the outer ring of the drill rod (1) and connects the outside of the drill rod (1) and the pressure chamber (25). The elastic explosion-proof metal sheet (41) is fixedly installed in the release hole (27). A cross hole (42) is provided in the middle of the elastic explosion-proof metal sheet (41). The pipe (6) is connected to the pressure chamber (25) through a connecting pipe (43). A seventh solenoid valve (44) is provided in the connecting pipe (43).

4. The ultrasonic activation segmented fracturing device for coal seams according to claim 1, characterized in that: The ultrasonic activation mechanism (5) includes an ultrasonic generator (30) and a housing (29). The housing (29) is fixedly installed on the inner wall of the drill rod (1). The ultrasonic generator (30) is installed inside the housing (29). The housing (29) is filled with liquid.

5. The ultrasonic activation segmented fracturing device for coal seams according to claim 1, characterized in that: The adjusting mechanism (4) includes a control box (28), a spring (17), a push plate (15), a push groove (16), a connecting rod (18), and a pressure push plate (19). The control box (28) is fixedly installed on the inner wall of the drill rod (1). The pressure push plate (19) is slidably installed inside the control box (28). The side of the pressure push plate (19) away from the pipe (6) is fixedly connected to the connecting rod (18). The end of the connecting rod (18) away from the pressure push plate (19) moves through the outer surface of the control box (28). The push groove (16) is located at the outer ring of the drill rod (1) and connects the inside and outside of the drill rod (1). The push plate (15) is movably installed in the push groove (16). The side of the push plate (15) near the control box (28) is fixedly connected to the end of the connecting rod (18). One end of the spring (17) is fixedly welded to the side of the pressure push plate (19) near the connecting rod (18), and the other end of the spring (17) is fixedly welded to the inner wall of the control box (28) away from the pipe (6). The side of the pressure push plate (19) near the pipe (6) and the inside of the control box (28) form a pressure accumulator chamber (37). The side of the control box (28) near the pipe (6) is fixedly connected to a first docking pipe (38). A second docking pipe (39) is fixedly installed on the outer ring of the pipe (6). The first docking pipe (38) and the second docking pipe (39) are docked. A sixth solenoid valve (40) is installed in the second docking pipe (39). The pressure accumulator chamber (37) is connected to the first docking pipe (38), and the second docking pipe (39) is connected to the inside of the pipe (6).

6. The ultrasonic activation segmented fracturing device for coal seams according to claim 5, characterized in that: A first vent hole (21) is provided on one side of the control box (28). A fourth solenoid valve (20) is provided in the first vent hole (21). The first vent hole (21) connects the pressure accumulator chamber (37) and the outside of the control box (28). A second vent hole (23) is provided at the end of the drill rod (1) away from the drill bit (2). The second vent hole (23) connects the inside and outside of the drill rod (1). A fifth solenoid valve (24) is provided in the second vent hole (23).

7. The ultrasonic activation segmented fracturing device for coal seams according to claim 5, characterized in that: Multiple control boxes (28) are arranged along the inner wall of the drill rod (1), and the multiple control boxes (28) are distributed at equal angles.

8. The ultrasonic activation segmented fracturing device for coal seams according to claim 1, characterized in that: One end of the pipe (6) extending out of the drill rod (1) is connected to a high-pressure pump (8). The high-pressure pump (8) is connected to a water tank (9), an oil tank (10), and a gas tank (11). The water tank (9), the oil tank (10), the gas tank (11) and the high-pressure pump (8) are respectively equipped with a first solenoid valve (12), a second solenoid valve (13) and a third solenoid valve (14).

9. A method for ultrasonic-activated segmented fracturing, characterized in that: The coal seam ultrasonic activation segmented fracturing device according to any one of claims 1-8 further includes the following method: S1: Continuous drilling. When the motor (32) starts, the motor (32) drives the drill bit (2) to rotate. The drill bit (2) drills in the coal seam (7). At the same time as the drill bit (2) drills in the coal seam (7), the drill rod (1) extends into the coal seam (7). When adjusting the drilling direction of the drill bit (2) in the coal seam (7), the corresponding sixth solenoid valve (40) can be opened, so that the medium in the pipeline (6) enters the accumulator chamber (37). The medium pushes the pressure push plate (19) to move away from the pipeline (6), so that the push plate (15) extends out. The groove (16) serves to push the push plate (15) in the internal structure of the coal seam (7) to adjust the push plate (15) at different positions on the outer ring of the drill rod (1), thereby controlling the overall drilling direction of the drill bit (2). The GPS positioning chip (33) can be used to monitor the position of the drill rod (1) in the coal seam (7) for easy control. Since the pipe (6) is connected to the drill rod (1), the drill rod (1) can continuously drill in the coal seam (7). As the drill rod (1) advances in the coal seam (7), it can crack the coal seam (7) once every appropriate distance. S2: Fracturing. When the drill rod (1) reaches a suitable position in the coal seam (7), the medium is injected into the pipeline (6) to pressurize it. The seventh solenoid valve (44) is opened, and the medium enters the interior of the pressure chamber (25) through the connecting pipeline (43). When the medium in the pressure chamber (25) reaches a certain pressure, the elastic explosion-proof metal sheet (41) breaks from the position of the cross hole (42) under the ultimate pressure, so that the medium is quickly pressed into the coal seam (7) from the release hole (27), thus achieving the purpose of fracturing the coal seam (7). S3: Ultrasonic activation. After the medium fracturing the coal seam (7), it is uniformly dispersed in the coal seam (7) layer structure, which is more conducive to the transmission of ultrasonic waves generated by the ultrasonic generator (30) in the coal seam (7) during operation, thereby comprehensively loosening and activating the coal seam (7).

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