Dynamic coal seam gas extraction device based on fracturing and hole fixing and using method of dynamic coal seam gas extraction device

Abstract

The invention provides a dynamic coal seam gas extraction device based on fracturing and hole fixing and a using method thereof, and belongs to the technical field of coal mine gas governing. The device comprises an outer ring, a middle ring is coaxially arranged on the inner side of the outer ring, an inner ring is coaxially arranged on the inner side of the middle ring, and a high-pressure fracturing channel is formed between the outer ring and the middle ring; a grouting channel is formed between the middle ring and the inner ring, a gas extraction channel is formed in the inner ring, and a fracturing module is arranged on the top of the outer ring. Fracturing, grouting and extraction functions are integrated through the three-channel composite drill rod, fracture filling and slurry permeation into coal and rock mass fracturing fractures are innovatively adopted to form a three-dimensional net-shaped framework structure, meanwhile, the annular reinforcing plate further improves the stability of a hole channel, a fracturing-reinforcing-extraction multi-process dynamic operation model is established, and the construction efficiency is improved. Therefore, the drilling stability is enhanced, the extraction efficiency is improved, and the construction cost is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of coal mine gas control, and particularly relates to a dynamic coal seam gas drainage device based on fracturing and hole consolidation and a using method thereof. Background Art

[0002] Coal mine gas drainage is to drill holes into coal seams and gas accumulation areas, connect the drill holes to special pipelines, and use drainage equipment to drain the gas in the coal seams and goafs to the ground for utilization; or discharge it into the main return air current. Gas drainage is not only an important measure to reduce the gas emission during the mining process, prevent gas overrun and accumulation, and prevent gas explosion and coal and gas outburst accidents, but also can turn harm into benefit and be developed and utilized as an associated resource of coal.

[0003] With the increase of coal mine mining depth, problems such as low gas drainage efficiency of low-permeability coal seams and easy failure of drill holes become increasingly prominent. In the prior art, there are significant deficiencies in traditional fracturing and hole consolidation methods. First, the step-by-step construction efficiency is low. The existing process usually adopts a step-by-step operation mode of "fracturing → grouting → drainage", resulting in complex process connection and long cycle. According to statistics, the comprehensive construction time of a single hole exceeds 20 hours, and 30% of the time is consumed for equipment conversion and positioning adjustment. More seriously, the fracture network formed by fracturing partially closes before grouting during step-by-step construction, and the loss rate of effective diversion channels reaches more than 40%. Second, the drill hole reinforcement technology lags behind. The penetration depth of conventional grouting materials in soft and broken coal seams is insufficient (usually <5 cm), and it is difficult to form an effective reinforcement circle. Although mechanical bolts can provide immediate support, the installation process disturbs the hole wall and is prone to shear failure under high in-situ stress conditions. In addition, the existing grouting process lacks the ability to dynamically adapt to formation conditions, and parameters such as grouting pressure and slurry ratio mostly rely on empirical settings, resulting in the widespread existence of grouting blind areas.

[0004] In summary, it is of great significance to carry out research on the existing gas drainage technology. Summary of the Invention

[0005] To solve the above problems, especially the deficiencies existing in the prior art, the present invention provides a dynamic coal seam gas drainage device based on fracturing and hole consolidation and a using method thereof, which can solve the problems of low gas drainage efficiency and backward hole fixing technology for gas drainage.

[0006] To achieve the above object, the present invention adopts the following technical means: In a first aspect, the present invention provides a dynamic coal seam gas drainage device based on fracturing and hole consolidation, including an outer ring. An intermediate ring is coaxially arranged inside the outer ring, and an inner ring is coaxially arranged inside the intermediate ring. A high-pressure fracturing channel is formed between the outer ring and the intermediate ring, a grouting channel is formed between the intermediate ring and the inner ring, and a gas drainage channel is formed inside the inner ring. A fracturing module is arranged at the top of the outer ring. A first driving motor is arranged above the fracturing module, and the output end of the first driving motor is connected to a main drill bit; inside the fracturing module, there is a fracturing telescopic frame. An extension drill bit is arranged at the front end of the fracturing telescopic frame. Five groups of rotatable jet modules are evenly installed on the side of the fracturing telescopic frame, and an array of nozzles is arranged above the jet module. The array of nozzles includes a main nozzle at the center and auxiliary nozzles on the outside; two groups of ring reinforcement seats are symmetrically arranged on the outside of the outer ring. Multiple convex semi-solid ring frames are arranged at the front end of the ring reinforcement seat. A linkage tray frame is arranged at the bottom of the convex semi-solid ring frame, and a hydraulic reinforcement telescopic frame is arranged above the linkage tray frame.

[0007] Optionally, an inner cavity is arranged inside the fracturing module. Four fracturing holes are arranged on the side of the fracturing module. A partition plate is arranged at the bottom of the inner cavity. A support frame is installed at the middle position of the inner cavity. Second driving motors are arranged on the four sides of the support frame. The output end of the second driving motor is provided with an extension rotating rod, and a fracturing operation table is arranged at the front end of the extension rotating rod.

[0008] Optionally, a fracturing hydraulic pump is arranged at the front end of the fracturing operation table. A fracturing telescopic frame is arranged at the front end of the fracturing hydraulic pump. A third driving motor is arranged on the outermost side at the front end of the fracturing telescopic frame. The output end of the third driving motor is provided with a jet rotating shaft, and a jet module is arranged at the front end of the jet rotating shaft. A jet pipe is arranged at the bottom of the second driving motor. One end of the jet pipe passes through the center positions of the second driving motor, the extension rotating rod, and the fracturing telescopic frame and is connected to the jet module. The other end of the jet pipe is connected to the high-pressure fracturing channel, and the bottom of the high-pressure fracturing channel can be connected to an external high-pressure fracturing device.

[0009] Optionally, grouting holes are communicated with the side of the grouting channel, and the bottom of the grouting channel can be connected to an external grouting device.

[0010] Optionally, a grouting hydraulic pump is arranged at the top of the grouting channel. A grouting telescopic frame is arranged at the bottom of the grouting hydraulic pump. A retaining ring frame is installed at the bottom of the grouting telescopic frame, and the retaining ring frame can close the grouting holes.

[0011] Optionally, extraction holes are arranged on the side of the gas drainage channel. Slide rails are arranged inside the extraction holes. An extraction hole channel is arranged at the front end of the extraction holes. A fourth driving motor is installed at the center position inside the extraction holes. The gas drainage channel can be connected to an external gas extraction device.

[0012] Optionally, a pumping screw rod is provided at the output end of the fourth driving motor. A sliding seat is sleeved on the pumping screw rod. A pumping table is installed at the front end of the sliding seat. Sliders are provided on both sides of the pumping table. The sliders are slidably connected to the sliding rails. A connecting frame is provided on the upper part of the pumping table. A plugging column is installed at the front end of the connecting frame.

[0013] Optionally, a fifth driving motor is provided at the front end of the ring reinforcement seat. A reinforcement screw rod is provided at the output end of the fifth driving motor. A convex semi-fixed ring frame is sleeved on the upper part of the reinforcement screw rod.

[0014] Optionally, a pressing seat is installed at the bottom of the ring reinforcement seat. A pressing hydraulic pump is installed at the front end of the pressing seat. A hydraulic reinforcement telescopic frame is provided at the front end of the pressing hydraulic pump. A fixed column is provided at the bottom of the hydraulic reinforcement telescopic frame. A linkage tray frame is provided at the bottom of the fixed column.

[0015] In a second aspect, the present invention provides a dynamic coal seam gas drainage device and its use method based on fracturing and hole solidification as described in the first aspect, including the following steps: S1. The main drill bit drives the device to drill to each position where gas can be drained to form coal seam drainage holes, and stops operating at each position. S2. Conduct fracturing operations. The extension drill bit drills into the coal seams on both sides, and the drilling distance is greater than 10 cm. The fracturing module is connected to an external high-pressure fracturing device through a high-pressure fracturing channel, and the device starts operating to spray fracturing fluid. At the same time, the third driving motor starts operating to drive the jet module to rotate. S3. First reinforcement: Start the fifth driving motor, drop the convex semi-fixed ring frames onto the upper part of the linkage tray frame in sequence, and then press a set of convex semi-fixed ring frames into the coal seam drainage holes through four sets of hydraulic reinforcement telescopic frames to perform reinforcement operations. S4. Second reinforcement: Open the retaining ring frame, start the grouting equipment connected to the outside of the grouting channel. The slurry is sprayed into the hole and the fracture formed in S2 through the grouting channel and grouting holes to further reinforce the hole. At the same time, use the fracture network formed by fracturing as the slurry diffusion channel to form a three-dimensional networked skeleton structure, reinforce the fracture, and improve the later drainage effect. S5. Conduct drainage operations: Start the fourth driving motor, retract the plugging column to open the drainage hole, and then the drainage equipment outside connected to the gas drainage channel starts operating to conduct drainage operations through the drainage hole and the gas drainage channel.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. Through the high-pressure fracturing channel formed between the outer ring and the middle ring, the grouting channel formed between the middle ring and the inner ring, and the gas drainage channel formed inside the inner ring, operators can, according to the design requirements, start the first drive motor to drive the main drill bit to rotate, drill the device to various appropriate positions to form coal seam drainage boreholes, stop operating at each position. After the drilling is completed, the jet module rotates, and the jet module drives the main nozzle and auxiliary nozzles on its upper part to rotate, increasing the jet angle and direction while rotating, improving the fracturing effect, and pressing the convex semi-solid ring frame into the coal seam drainage borehole through the hydraulic reinforcement telescopic frame, effectively solving the problems of low gas drainage efficiency and backward technology for fixing drainage holes.

[0017] 2. The present invention integrates the functions of fracturing, grouting, and drainage through a three-channel composite drill pipe, innovatively adopts crack filling, the slurry infiltrates into the coal and rock mass fracturing cracks to form a three-dimensional network skeleton structure, and at the same time the annular reinforcement plate further improves the stability of the hole, establishing a dynamic operation model for multiple processes of fracturing-reinforcement-drainage, thereby improving the borehole stability, increasing the drainage efficiency, and reducing the construction cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of the dynamic coal seam gas drainage device based on fracturing and hole consolidation in an embodiment of the present invention; Figure 2 is a front view of the dynamic coal seam gas drainage device based on fracturing and hole consolidation in an embodiment of the present invention; Figure 3 is a sectional view of the dynamic coal seam gas drainage device based on fracturing and hole consolidation in an embodiment of the present invention; Figure 4 is a schematic internal structure diagram of the fracturing module of the dynamic coal seam gas drainage device based on fracturing and hole consolidation in an embodiment of the present invention; Figure 5 is a top view of the fracturing module of the dynamic coal seam gas drainage device based on fracturing and hole consolidation in an embodiment of the present invention; Figure 6 is a schematic partial structure diagram of the fracturing module of the dynamic coal seam gas drainage device based on fracturing and hole consolidation in an embodiment of the present invention; Figure 7 is in the present invention Figure 6 is a partial enlarged view at A; Figure 8 is a schematic internal structure diagram of the dynamic coal seam gas drainage device based on fracturing and hole consolidation in an embodiment of the present invention; Figure 9 is a schematic diagram of the ring reinforcement structure of the dynamic coal seam gas drainage device based on fracturing and hole consolidation in an embodiment of the present invention; Figure 10It is the assembly drawing of the ring reinforcement structure of the dynamic coal seam gas drainage device based on fracturing and hole consolidation in an embodiment of the present invention; Figure 11 It is the schematic diagram of the internal structure of the gas drainage channel of the dynamic coal seam gas drainage device based on fracturing and hole consolidation in an embodiment of the present invention; Figure 12 It is the schematic diagram of the internal structure of the drainage hole of the dynamic coal seam gas drainage device based on fracturing and hole consolidation in an embodiment of the present invention.

[0019] In the figure: 1, outer ring; 2, middle ring; 3, inner ring; 4, high-pressure fracturing channel; 5, grouting channel; 6, gas drainage channel; 7, fracturing module; 8, ring reinforcement seat; 9, first driving motor; 10, main drill bit; 51, grouting hole; 52, grouting hydraulic pump; 53, grouting telescopic frame; 54, retaining ring frame; 61, drainage hole; 62, fourth driving motor; 63, drainage lead screw; 64, sliding seat; 65, drainage table; 65, drainage table; 66, connecting frame; 67, plugging column; 71, inner cavity; 72, support frame; 73, second driving motor; 74, extension rotating rod; 75, fracturing operation table; 76, fracturing hydraulic pump; 77, fracturing telescopic frame; 78, third driving motor; 79, jet module; 80, extension drill bit; 611, slide rail; 612, drainage hole channel; 651, slider; 711, fracturing hole; 712, isolation plate; 731, jet pipe; 781, injection rotating shaft; 791, main nozzle; 792, auxiliary nozzle; 81, fifth driving motor; 82, reinforcement lead screw; 83, convex semi-solid ring frame; 84, linkage tray frame; 85, pressing seat; 86, pressing hydraulic pump; 87, hydraulic reinforcement telescopic frame; 88, fixed column. Detailed implementation manners

[0020] The following further describes the present invention with reference to the accompanying drawings.

[0021] Embodiment 1 provided by the present invention: As Figures 1 to 7 shown, in an embodiment of the present invention, a dynamic coal seam gas drainage device based on fracturing and hole consolidation includes an outer ring 1, a middle ring 2 is coaxially arranged inside the outer ring 1, an inner ring 3 is coaxially arranged inside the middle ring 2, a high-pressure fracturing channel 4 is formed between the outer ring 1 and the middle ring 2, a grouting channel 5 is formed between the middle ring 2 and the inner ring 3, a gas drainage channel 6 is formed inside the inner ring 3, a fracturing module 7 is arranged at the top of the outer ring 1, a first driving motor 9 is arranged above the fracturing module 7, and the output end of the first driving motor 9 is connected to a main drill bit 10.

[0022] Inside the fracturing module 7, there is a fracturing telescopic frame 77. At the front end of the fracturing telescopic frame 77, there is an extension drill bit 80. Five groups of rotatable jet modules 79 are evenly installed on the side of the fracturing telescopic frame 77. And an array of nozzles is arranged on the upper part of the jet module 79. The array of nozzles includes a main nozzle 791 at the center and auxiliary nozzles 792 on the outside.

[0023] On the outside of the outer ring 1, two groups of ring reinforcement seats 8 are symmetrically arranged. At the front end of the ring reinforcement seat 8, there are multiple convex semi-fixed ring frames 83. At the bottom of the convex semi-fixed ring frame 83, there is a linkage tray frame 84. And a hydraulic reinforcement telescopic frame 87 is arranged on the upper part of the linkage tray frame 84.

[0024] As Figures 3 to 5 As shown, inside the fracturing module 7, there is an inner cavity 71. Four fracturing holes 711 are arranged on the side of the fracturing module 7. A partition plate 712 is arranged at the bottom of the inner cavity 71. A support frame 72 is installed at the middle position of the inner cavity 71. Second driving motors 73 are arranged on the four sides of the support frame 72. An extension rotating rod 74 is arranged at the output end of the second driving motor 73. And a fracturing operation table 75 is arranged at the front end of the extension rotating rod 74.

[0025] As Figures 3 to 8 As shown, a fracturing hydraulic pump 76 is arranged at the front end of the fracturing operation table 75. A fracturing telescopic frame 77 is arranged at the front end of the fracturing hydraulic pump 76. A third driving motor 78 is arranged on the outside of the outermost front end of the fracturing telescopic frame 77. An injection rotating shaft 781 is arranged at the output end of the third driving motor 78. A jet module 79 is arranged at the front end of the injection rotating shaft 781. A jet pipe 731 is arranged at the bottom of the second driving motor 73. One end of the jet pipe 731 passes through the center positions of the second driving motor 73, the extension rotating rod 74, and the fracturing telescopic frame 77 and is connected to the jet module 79. The other end of the jet pipe 731 is connected to the high-pressure fracturing channel 4. The bottom of the high-pressure fracturing channel 4 can be connected to an external high-pressure fracturing device.

[0026] Further, start the second driving motor 73. The second driving motor 73 drives the extension rotating rod 74 to rotate. The extension rotating rod 74 drives the fracturing operation table 75, the fracturing hydraulic pump 76, the fracturing telescopic frame 77, the jet module 79, and the extension drill bit 80 at the outermost front end to rotate. At the same time, start the fracturing hydraulic pump 76. The fracturing hydraulic pump 76 drives the fracturing telescopic frame 77 to expand. The fracturing telescopic frame 77 drives the extension drill bit 80 to approach the coal seam walls on both sides and drill holes inward. The drilling distance is greater than 10 cm.

[0027] Further, the injection rotating shaft 781 drives the jet module 79 to rotate. The jet module 79 drives the main nozzle 791 and the auxiliary nozzle 792 on its upper part to rotate. The diameter of the main nozzle 791 is 2 mm, with 6 holes evenly distributed, and the jet angle is 15°. The diameter of the auxiliary nozzle 792 is 0.5 mm, with 12 holes in a circular array, and the jet angle is 45°. While rotating, the injection angle and direction are increased to improve the fracturing effect.

[0028] Embodiment 2 provided by the present invention: As Figures 2 to 6 and attached Figure 8 shown, in an embodiment of the present invention, for the dynamic coal seam gas drainage device based on fracturing and hole consolidation, on the basis of Embodiment 1, a grouting hole 51 is communicated with the side of the grouting channel 5, and the bottom of the grouting channel 5 can be connected to the external grouting equipment.

[0029] A grouting hydraulic pump 52 is arranged at the top of the grouting channel 5. A grouting telescopic frame 53 is arranged at the bottom of the grouting hydraulic pump 52. A retaining ring frame 54 is installed at the bottom of the grouting telescopic frame 53, and the retaining ring frame 54 can seal the grouting hole 51.

[0030] Further, during the grouting operation, the slurry is sprayed into the hole and the formed fracture through the grouting channel 5 and the grouting hole 51 to further reinforce the hole. At the same time, the fracture network formed by fracturing is used as the slurry diffusion channel to form a three-dimensional network skeleton structure, reinforce the fracture, and improve the later drainage effect.

[0031] As Figures 1 to 3 、attached Figure 11 and attached Figure 12 shown, a drainage hole 61 is arranged on the side of the gas drainage channel 6. A slide rail 611 is arranged inside the drainage hole 61. A drainage hole channel 612 is arranged at the front end of the drainage hole 61. A fourth driving motor 62 is installed at the center position inside the drainage hole 61, and the gas drainage channel 6 can be connected to the external drainage equipment.

[0032] The output end of the fourth driving motor 62 is provided with a drainage lead screw 63. A sliding seat 64 is sleeved on the drainage lead screw 63. A drainage table 65 is installed at the front end of the sliding seat 64. Sliders 651 are arranged on both sides of the drainage table 65, and the sliders 651 are slidably connected with the slide rail 611. A connecting frame 66 is arranged on the upper part of the drainage table 65, and a plugging column 67 is installed at the front end of the connecting frame 66.

[0033] As Figures 2 to 10 shown, a fifth driving motor 81 is arranged at the front end of the annular reinforcement seat 8. The output end of the fifth driving motor 81 is provided with a reinforcement lead screw 82. A convex semi-retaining ring frame 83 is sleeved on the upper part of the reinforcement lead screw 82.

[0034] A pressing seat 85 is installed at the bottom of the ring reinforcement seat 8. A pressing hydraulic pump 86 is installed at the front end of the pressing seat 85. A hydraulic reinforcement telescopic frame 87 is arranged at the front end of the pressing hydraulic pump 86. A fixed column 88 is arranged at the bottom of the hydraulic reinforcement telescopic frame 87. A linkage tray frame 84 is arranged at the bottom of the fixed column 88.

[0035] Further, the reinforcement screw rod 82 drives the upper convex semi-fixed ring frame 83 on it to move forward. When the foremost convex semi-fixed ring frame 83 moves out of the reinforcement screw rod 82, it falls on the linkage tray frame 84, and the fifth drive motor 81 stops operating. At the same time, the pressing hydraulic pump 86 starts operating, and a set of convex semi-fixed ring frames 83 are pressed into the coal seam drainage borehole through four groups of hydraulic reinforcement telescopic frames 87 to perform the reinforcement operation.

[0036] Working principle: The operator starts the first drive motor 9 according to the design requirements to drive the main drill bit 10 to rotate, drills the device to each appropriate position to form a coal seam drainage borehole, and stops operating at each position.

[0037] Then, the second drive motor 73 is started. The second drive motor 73 drives the extension rotating rod 74 to rotate. The extension rotating rod 74 drives the fracturing operation table 75, the fracturing hydraulic pump 76, the fracturing telescopic frame 77, the jet module 79, and the foremost extension drill bit 80 to rotate. At the same time, the fracturing hydraulic pump 76 is started, and the fracturing hydraulic pump 76 drives the fracturing telescopic frame 77 to expand. The fracturing telescopic frame 77 drives the extension drill bit 80 to approach the two-side coal seam walls and drill holes in their inner sides. The drilling distance is greater than 10 cm.

[0038] After the extension drilling is completed, the third drive motor 78 is started. The third drive motor 78 drives the jet rotating shaft 781 to rotate. The jet rotating shaft 781 drives the jet module 79 to rotate. The jet module 79 drives the main nozzle 791 and the auxiliary nozzle 792 on its upper part to rotate. The diameter of the main nozzle 791 is 2 mm, with 6 holes evenly distributed, and the jet angle is 15°. The diameter of the auxiliary nozzle 792 is 0.5 mm, with 12 holes in a circular array, and the jet angle is 45°. While rotating, the jet angle and direction are increased to improve the fracturing effect.

[0039] After the fracturing is completed, the first reinforcement is carried out. The fifth drive motor 81 is started. The fifth drive motor 81 drives the reinforcement screw rod 82 to rotate. The reinforcement screw rod 82 drives the upper convex semi-fixed ring frame 83 on it to move forward. When the foremost convex semi-fixed ring frame 83 moves out of the reinforcement screw rod 82, it falls on the linkage tray frame 84, and the fifth drive motor 81 stops operating. At the same time, the pressing hydraulic pump 86 starts operating, and a set of convex semi-fixed ring frames 83 are pressed into the coal seam drainage borehole through four groups of hydraulic reinforcement telescopic frames 87 to perform the reinforcement operation.

[0040] Next, the second reinforcement is carried out. The grouting hydraulic pump 52 is started, and the grouting hydraulic pump 52 drives the grouting telescopic frame 53 to retract, thereby opening the retaining ring frame 54. In this way, the grouting channel 5 is connected to the grouting holes 51. The grouting equipment connected to the outside of the grouting channel 5 is started, and the slurry is sprayed into the hole passage and the formed pressure cracks through the grouting channel 5 and the grouting holes 51 to further reinforce the hole passage. At the same time, the fracture network formed by fracturing is used as the slurry diffusion channel to form a three-dimensional network skeleton structure, reinforce the pressure cracks, and improve the later extraction effect.

[0041] Finally, the extraction operation is carried out. The fourth driving motor 62 is started, and the fourth driving motor 62 drives the extraction lead screw 63 to rotate. The extraction lead screw 63 drives the sliding seat 64 and the extraction table 65 at the front end to move backward, thereby retracting the plugging column 67 and opening the extraction hole passage 612. Then, the extraction equipment on the outside connected to the gas extraction channel 6 starts to operate, and the extraction operation is carried out through the extraction hole passage 612 and the gas extraction channel 6.

[0042] Example 3 provided by the present invention: This embodiment provides a method for using the dynamic coal seam gas extraction device based on fracturing and hole solidification described in Example 1 or Example 2, and the steps are as follows: S1. The main drill bit 10 drives the device to drill to each appropriate (extractable) position to form a coal seam extraction borehole, and stop operating at each position; S2. Carry out the fracturing operation. The extension drill bit 80 drills into the coal seams on both sides, and the drilling distance is greater than 10 cm. The fracturing module 7 is connected to the external high-pressure fracturing equipment through the high-pressure fracturing channel 4, and the equipment starts to operate to spray the fracturing fluid. At the same time, the third driving motor 78 starts to operate and drives the jet module 79 to rotate; S3. The first reinforcement: Start the fifth driving motor 81, drop the convex semi-solid ring frame 83 onto the upper part of the linkage tray frame 84 in sequence, and then press a group of convex semi-solid ring frames 83 into the coal seam extraction borehole through the four groups of hydraulic reinforcement telescopic frames 87 to perform the reinforcement operation; S4. The second reinforcement: Open the retaining ring frame 54, start the grouting equipment connected to the outside of the grouting channel 5, and the slurry is sprayed into the hole passage and the pressure cracks formed in S2 through the grouting channel 5 and the grouting holes 51 to further reinforce the hole passage. At the same time, the fracture network formed by fracturing is used as the slurry diffusion channel to form a three-dimensional network skeleton structure, reinforce the pressure cracks, and improve the later extraction effect; S5. Carry out the extraction operation. Start the fourth driving motor 62, retract the plugging column 67 and open the extraction hole passage 612. Then, the extraction equipment on the outside connected to the gas extraction channel 6 starts to operate, and the extraction operation is carried out through the extraction hole passage 612 and the gas extraction channel 6.

[0043] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0044] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or equivalently replace some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A dynamic coal seam gas drainage device based on fracturing and hole consolidation, comprising an outer ring (1), characterized in that: A middle ring (2) is coaxially arranged inside the outer ring (1), and an inner ring (3) is coaxially arranged inside the middle ring (2). A high-pressure fracturing channel (4) is formed between the outer ring (1) and the middle ring (2), a grouting channel (5) is formed between the middle ring (2) and the inner ring (3), and a gas drainage channel (6) is formed inside the inner ring (3). A fracturing module (7) is arranged at the top of the outer ring (1), a first driving motor (9) is arranged above the fracturing module (7), and the output end of the first driving motor (9) is connected with a main drill bit (10). A fracturing telescopic frame (77) is arranged inside the fracturing module (7), an extension drill bit (80) is arranged at the front end of the fracturing telescopic frame (77), and five rotatable jet modules (79) are uniformly installed on the side of the fracturing telescopic frame (77). An array of nozzles is arranged above the jet module (79), and the array of nozzles includes a main nozzle (791) at the center and auxiliary nozzles (792) on the outside. Two groups of ring reinforcement seats (8) are symmetrically arranged on the outside of the outer ring (1). A plurality of convex semi-fixed ring frames (83) are arranged at the front end of the ring reinforcement seat (8), a linkage tray frame (84) is arranged at the bottom of the convex semi-fixed ring frame (83), and a hydraulic reinforcement telescopic frame (87) is arranged above the linkage tray frame (84).

2. The dynamic coal seam gas drainage device based on fracturing and hole solidification according to claim 1, wherein: An inner cavity (71) is arranged inside the fracturing module (7). Four fracturing holes (711) are arranged on the side of the fracturing module (7). A partition plate (712) is arranged at the bottom of the inner cavity (71). A support frame (72) is installed at the middle position of the inner cavity (71). Second driving motors (73) are arranged on four sides of the support frame (72). The output end of the second driving motor (73) is provided with an extension rotating rod (74), and a fracturing operation table (75) is arranged at the front end of the extension rotating rod (74).

3. The dynamic coal seam gas drainage device based on fracturing and hole consolidation according to claim 2, characterized in that: A fracturing hydraulic pump (76) is arranged at the front end of the fracturing operation table (75). A fracturing telescopic frame (77) is arranged at the front end of the fracturing hydraulic pump (76). A third driving motor (78) is arranged on the outermost side of the front end of the fracturing telescopic frame (77). The output end of the third driving motor (78) is provided with a jet rotating shaft (781), and a jet module (79) is arranged at the front end of the jet rotating shaft (781). A jet pipe (731) is arranged at the bottom of the second driving motor (73). One end of the jet pipe (731) passes through the center positions of the second driving motor (73), the extension rotating rod (74) and the fracturing telescopic frame (77) and is connected with the jet module (79). The other end of the jet pipe (731) is connected with the high-pressure fracturing channel (4), and the bottom of the high-pressure fracturing channel (4) can be connected with external high-pressure fracturing equipment.

4. The dynamic coal seam gas drainage device based on fracturing and hole solidification according to claim 3, wherein, Grouting holes (51) are communicated with the side of the grouting channel (5), and the bottom of the grouting channel (5) can be connected with external grouting equipment.

5. The dynamic coal seam gas drainage device based on fracturing and hole consolidation according to claim 4, wherein, A grouting hydraulic pump (52) is provided at the top of the grouting channel (5). A grouting telescopic frame (53) is provided at the bottom of the grouting hydraulic pump (52). A retaining ring frame (54) is installed at the bottom of the grouting telescopic frame (53), and the retaining ring frame (54) can seal the grouting hole (51).

6. The dynamic coal seam gas drainage device based on fracturing and hole consolidation according to claim 5, characterized in that, A gas drainage hole (61) is provided on the side of the gas drainage channel (6). A slide rail (611) is provided inside the gas drainage hole (61). A gas drainage hole channel (612) is provided at the front end of the gas drainage hole (61). A fourth drive motor (62) is installed at the center position inside the gas drainage hole (61). The gas drainage channel (6) can be connected to an external drainage device.

7. The dynamic coal seam gas drainage device based on fracturing and hole solidification according to claim 6, wherein A drainage lead screw (63) is provided at the output end of the fourth drive motor (62). A sliding seat (64) is sleeved on the drainage lead screw (63). A drainage table (65) is installed at the front end of the sliding seat (64). Sliders (651) are provided on both sides of the drainage table (65), and the sliders (651) are slidably connected to the slide rail (611). A connecting frame (66) is provided on the upper part of the drainage table (65), and a plugging column (67) is installed at the front end of the connecting frame (66).

8. The dynamic coal seam gas drainage device based on fracturing and hole solidification according to claim 7, characterized in that, A fifth drive motor (81) is provided at the front end of the ring reinforcement seat (8). A reinforcement lead screw (82) is provided at the output end of the fifth drive motor (81). A convex semi-fixed ring frame (83) is sleeved on the upper part of the reinforcement lead screw (82).

9. The dynamic coal seam gas drainage device based on fracturing and hole solidification according to claim 8, wherein, A pressing seat (85) is installed at the bottom of the ring reinforcement seat (8). A pressing hydraulic pump (86) is installed at the front end of the pressing seat (85). A hydraulic reinforcement telescopic frame (87) is provided at the front end of the pressing hydraulic pump (86). A fixed column (88) is provided at the bottom of the hydraulic reinforcement telescopic frame (87), and a linkage tray frame (84) is provided at the bottom of the fixed column (88).

10. A method for using the dynamic coal seam gas drainage device based on fracturing and hole consolidation according to claim 9, characterized in that, It includes the following steps: S1. The main drill bit (10) drives the device to drill to each position where extraction can be carried out to form coal seam extraction boreholes, and stop operating at each position; S2. Carry out fracturing operations. The extension drill bit (80) drills into the coal seams on both sides, and the drilling distance is greater than 10 cm. The fracturing module (7) is connected to an external high-pressure fracturing device through the high-pressure fracturing channel (4), and the device starts operating to spray fracturing fluid. At the same time, the third drive motor (78) starts operating to drive the jet module (79) to rotate; S3. First reinforcement. Start the fifth drive motor (81), drop the convex semi-fixed ring frames (83) onto the upper part of the linkage tray frame (84) in sequence, and then press a group of convex semi-fixed ring frames (83) into the coal seam extraction boreholes through the four groups of hydraulic reinforcement telescopic frames (87) to perform the reinforcement operation; S4. Second reinforcement. Open the retaining ring frame (54), start the grouting device connected to the outside of the grouting channel (5), and the slurry is sprayed into the borehole and the fracture formed in S2 through the grouting channel (5) and the grouting hole (51) to further reinforce the borehole. At the same time, use the fracture network formed by fracturing as the slurry diffusion channel to form a three-dimensional networked skeleton structure, reinforce the fracture, and improve the later extraction effect; S5. Conduct gas extraction operations. Start the fourth drive motor (62), retract the plugging column (67) to open the extraction duct (612), and then the extraction equipment on the outer side connected to the gas extraction channel (6) starts operating. Conduct gas extraction operations through the extraction duct (612) and the gas extraction channel (6).

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