Dynamic coal seam gas extraction device based on fracturing and hole fixing and use method thereof

Abstract

The present invention provides a dynamic coal seam gas extraction device based on fracturing and hole cementing, and a method for using the device. This device belongs to the technical field of coal mine gas control. The device includes an outer ring, a middle ring coaxially arranged inside the outer ring, and an inner ring coaxially arranged inside the middle ring. A high-pressure fracturing channel is formed between the outer and middle rings, a grouting channel is formed between the middle and inner rings, and a gas extraction channel is formed inside the inner ring. A fracturing module is provided on the top of the outer ring. The present invention integrates fracturing, grouting, and extraction functions through a three-channel composite drill pipe. The innovative method uses fracture filling, where slurry infiltrates the fractured cracks in the coal rock mass to form a three-dimensional reticular skeleton structure. At the same time, an annular reinforcement plate further improves the stability of the channel, establishing a fracturing-reinforcement-extraction multi-process dynamic operation model, thereby enhancing drilling stability, improving extraction efficiency, and reducing construction costs.

Description

Technical Field

[0001] The present invention belongs to the technical field of coal mine gas control, and in particular relates to a dynamic coal seam gas extraction device based on fracturing and hole fixing and a method for using the same. Background Art

[0002] Coal mine gas extraction involves drilling into coal seams and gas-concentrated areas, connecting the boreholes to dedicated pipelines, and using extraction equipment to pump the gas from the coal seams and goaf to the surface for utilization or discharge into the return air flow. Gas extraction is not only a key measure to reduce gas outflow during mining, prevent gas overshoot and accumulation, and prevent gas explosions and coal-gas outburst accidents, but it can also be used to benefit by developing and utilizing coal-associated resources.

[0003] As coal mining depths increase, problems such as low gas extraction efficiency and prone borehole failure in low-permeability coal seams are becoming increasingly prominent. Conventional fracturing and borehole reinforcement methods currently have significant shortcomings. First, the step-by-step construction process is inefficient. Existing processes typically employ a "fracturing → grouting → extraction" process, resulting in complex process transitions and lengthy production cycles. Statistics show that the total construction time for a single borehole exceeds 20 hours, with 30% of this time spent on equipment conversion and positioning adjustments. More seriously, this step-by-step construction process causes the fracture network formed by fracturing to partially close before grouting, resulting in a loss of over 40% of effective flow channels. Second, borehole reinforcement technology lags behind. Conventional grouting materials have insufficient penetration depth (typically less than 5 cm) in crushed and soft coal seams, making it difficult to form an effective reinforcement ring. While mechanical anchors can provide immediate support, the installation process disturbs the borehole wall and is prone to shear failure under high ground stress conditions. Furthermore, existing grouting processes lack the ability to dynamically adapt to formation conditions. Parameters such as grouting pressure and slurry ratio are often set based on empirical experience, leading to widespread grouting blind spots.

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

[0005] In order to solve the above problems, especially the shortcomings of the existing technology, the present invention provides a dynamic coal seam gas extraction device based on fracturing and hole fixing and its use method, which can solve the problems of low gas extraction efficiency and backward extraction channel fixing technology.

[0006] To achieve the above objectives, the present invention adopts the following technical means:

[0007] In the first aspect, the present invention provides a dynamic coal seam gas extraction device based on fracturing and hole fixing, comprising an outer ring, a middle ring coaxially arranged on the inner side of the outer ring, an inner ring coaxially arranged on the inner side of the middle ring, a high-pressure fracturing channel formed between the outer ring and the middle ring, a grouting channel formed between the middle ring and the inner ring, and a gas extraction channel formed inside the inner ring, a fracturing module provided on the top of the outer ring, a first drive motor provided on the upper part of the fracturing module, and a main drill bit connected to the output end of the first drive motor; a fracturing telescopic frame provided inside the fracturing module, an extension drill bit provided at the front end of the fracturing telescopic frame, five groups of rotatable jet modules evenly installed on the side of the fracturing telescopic frame, and an array nozzle provided on the upper part of the jet module, the array nozzle including a main nozzle in the center and auxiliary nozzles on the outer side; two groups of ring reinforcement seats are symmetrically arranged on the outer side of the outer ring, a plurality of convex semi-solid ring frames are provided at the front end of the ring reinforcement seat, a linkage tray frame is provided at the bottom of the convex semi-solid ring frame, and a hydraulic reinforcement telescopic frame is provided on the upper part of the linkage tray frame.

[0008] Optionally, an inner cavity is provided inside the fracturing module, four groups of fracturing holes are provided on the side of the fracturing module, an isolation plate is provided at the bottom of the inner cavity, a support frame is installed in the middle of the inner cavity, a second drive motor is provided on four sides of the support frame, an extension rotating rod is provided at the output end of the second drive motor, and a fracturing operation platform is provided at the front end of the extension rotating rod.

[0009] Optionally, a fracturing hydraulic pump is provided at the front end of the fracturing work platform, a fracturing telescopic frame is provided at the front end of the fracturing hydraulic pump, a third drive motor is provided on the outer side of the front end of the fracturing telescopic frame, an injection shaft is provided at the output end of the third drive motor, a jet module is provided at the front end of the injection shaft, a jet pipe is provided at the bottom of the second drive motor, one end of the jet pipe passes through the second drive motor, the extension rod and the center position of 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 external high-pressure fracturing equipment.

[0010] Optionally, a grouting hole is connected to the side of the grouting channel, and the bottom of the grouting channel can be connected to the grouting equipment on the outside.

[0011] Optionally, a grouting hydraulic pump is provided at the top of the grouting channel, a grouting telescopic frame is provided 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 hole.

[0012] Optionally, an extraction hole is provided on the side of the gas extraction channel, a slide rail is provided inside the extraction hole, an extraction channel is provided at the front end of the extraction hole, a fourth drive motor is installed at the center position inside the extraction hole, and the gas extraction channel can be connected to the extraction equipment on the outside.

[0013] Optionally, the output end of the fourth driving motor is provided with an extraction screw, a slide is sleeved on the extraction screw, an extraction platform is installed at the front end of the slide, sliders are provided on both sides of the extraction platform, the sliders are slidably connected to the slide rails, a connecting frame is provided on the upper part of the extraction platform, and a blocking column is installed at the front end of the connecting frame.

[0014] Optionally, a fifth drive 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 drive motor, and a convex semi-solid ring frame is sleeved on the upper part of the reinforcement screw rod.

[0015] Optionally, a compression seat is installed at the bottom of the ring reinforcement seat, a compression hydraulic pump is installed at the front end of the compression seat, a hydraulic reinforcement telescopic frame is provided at the front end of the compression hydraulic pump, a fixed column is provided at the bottom of the hydraulic reinforcement telescopic frame, and a linkage pallet frame is provided at the bottom of the fixed column.

[0016] In a second aspect, the present invention provides a dynamic coalbed gas extraction device based on fracturing and pore consolidation as described in the first aspect and a method for using the same, comprising the following steps:

[0017] S1. The main drill bit drives the device to drill to each location where extraction is possible to form a coal seam extraction borehole, and stops operating at each location;

[0018] S2. Perform fracturing operations by extending the drill bit into the coal seams on both sides. The drilling distance is greater than 10 cm. The fracturing module is connected to the external high-pressure fracturing equipment through the high-pressure fracturing channel, and the equipment starts to spray fracturing fluid. At the same time, the third drive motor starts to operate, driving the jet module to rotate.

[0019] S3, the first reinforcement, start the fifth drive motor, drop the convex semi-solid ring frame onto the upper part of the linkage tray frame in sequence, and then press one set of convex semi-solid ring frames into the coal seam extraction drill hole through four sets of hydraulic reinforcement telescopic frames to perform reinforcement operation;

[0020] S4, the second reinforcement, open the retaining ring frame, start the grouting equipment connected to the grouting channel and the outside, and inject slurry into the channel and the fracture formed in S2 through the grouting channel and grouting holes to further reinforce the channel. At the same time, the fracture network formed by the fracture is used as a slurry diffusion channel to form a three-dimensional network skeleton structure, reinforce the fracture and improve the subsequent extraction effect;

[0021] S5. Perform extraction operation, start the fourth drive motor, retract the blocking column and open the extraction channel, then the outer extraction equipment connected to the gas extraction channel starts to operate, and the extraction operation is performed through the extraction channel and the gas extraction channel.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 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 extraction channel formed inside the inner ring, the operator can start the first drive motor to drive the main drill bit to rotate according to the design requirements, drill the device to various suitable positions to form coal seam extraction boreholes, and stop operating at various positions. After the drilling is completed, the jet module rotates, and the jet module drives the main nozzle and auxiliary nozzle on its upper part to rotate. While rotating, the injection angle and direction are increased to improve the fracturing effect. The convex semi-solid ring frame is pressed into the coal seam extraction borehole through the hydraulic reinforcement telescopic frame, effectively solving the problems of low gas extraction efficiency and backward extraction channel fixing technology.

[0024] 2. The present invention integrates the functions of fracturing, grouting and extraction through a three-channel composite drill pipe. It innovatively adopts crack filling, and the slurry penetrates into the coal rock fracture cracks to form a three-dimensional network skeleton structure. At the same time, the annular reinforcement plate further improves the stability of the channel and establishes a multi-process dynamic operation model of fracturing-reinforcement-extraction, thereby improving the stability of the drilling, improving the extraction efficiency and reducing the construction cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the structure of a dynamic coal seam gas extraction device based on fracturing and pore consolidation in one embodiment of the present invention;

[0026] Figure 2 1 is a front view of a dynamic coal seam gas extraction device based on fracturing and hole fixing in one embodiment of the present invention;

[0027] Figure 3 is a cross-sectional view of a dynamic coal seam gas extraction device based on fracturing and pore consolidation in one embodiment of the present invention;

[0028] Figure 4 Schematic diagram of the internal structure of a fracturing module of a dynamic coal seam gas extraction device based on fracturing and pore consolidation in one embodiment of the present invention;

[0029] Figure 5 1. A top view of a fracturing module of a dynamic coalbed gas extraction device based on fracturing and hole fixing in one embodiment of the present invention;

[0030] Figure 6 1 is a schematic diagram of the partial structure of a fracturing module of a dynamic coal seam gas extraction device based on fracturing and pore consolidation in one embodiment of the present invention;

[0031] Figure 7 The present invention Figure 6 A partial enlarged view of the middle A;

[0032] Figure 8 Schematic diagram of the internal structure of a dynamic coal seam gas extraction device based on fracturing and pore consolidation in one embodiment of the present invention;

[0033] Figure 9 Schematic diagram of the ring reinforcement structure of a dynamic coal seam gas extraction device based on fracturing and hole fixing in one embodiment of the present invention;

[0034] Figure 10 This is an assembly diagram of a ring reinforcement structure of a dynamic coal seam gas extraction device based on fracturing and hole fixing in one embodiment of the present invention;

[0035] Figure 11 Schematic diagram of the internal structure of a gas extraction channel of a dynamic coal seam gas extraction device based on fracturing and pore consolidation in one embodiment of the present invention;

[0036] Figure 12 It is a schematic diagram of the internal structure of the extraction hole of a dynamic coal seam gas extraction device based on fracturing and hole fixing in one embodiment of the present invention.

[0037] In the figure: 1. Outer ring; 2. Middle ring; 3. Inner ring; 4. High-pressure fracturing channel; 5. Grouting channel; 6. Gas extraction channel; 7. Fracturing module; 8. Ring reinforcement seat; 9. First drive motor; 10. Main drill bit; 51. Grouting hole; 52. Grouting hydraulic pump; 53. Grouting telescopic frame; 54. Retaining ring frame; 61. Extraction hole; 62. Fourth drive motor; 63. Extraction screw rod; 64. Slide; 65. Extraction platform; 65. Extraction platform; 66. Connecting frame; 67. Blocking column; 71. Inner cavity; 72. Support frame; 73. Second drive motor; 74. Extended rotating rod; 75. Fracturing work platform; 76. Fracturing hydraulic pump; 77. Fracturing telescopic frame; 78. Third drive motor; 79. Jet module; 80. Extension drill bit; 611. Slide rail; 612. Extraction channel; 651. Slider; 711. Fracturing hole; 712. Isolation plate; 731. Jet pipe; 781. Jet shaft; 791. Main nozzle; 792. Auxiliary nozzle; 81. Fifth drive motor; 82. Reinforcement screw; 83. Convex semi-solid ring frame; 84. Linkage tray frame; 85. Clamping seat; 86. Clamping hydraulic pump; 87. Hydraulic reinforcement telescopic frame; 88. Fixed column. DETAILED DESCRIPTION

[0038] The present invention will be further described below with reference to the accompanying drawings.

[0039] Embodiment 1 provided by the present invention:

[0040] like Figures 1 to 7As shown, in one embodiment of the present invention, a dynamic coal seam gas extraction device based on fracturing and hole fixing includes an outer ring 1, a middle ring 2 is coaxially arranged on the inner side of the outer ring 1, an inner ring 3 is coaxially arranged on the inner side of 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 extraction channel 6 is formed inside the inner ring 3. A fracturing module 7 is arranged on the top of the outer ring 1, and a first drive motor 9 is arranged on the upper part of the fracturing module 7. The output end of the first drive motor 9 is connected to the main drill bit 10.

[0041] A fracturing telescopic frame 77 is provided inside the fracturing module 7, and an extension drill bit 80 is provided at the front end of the fracturing telescopic frame 77. Five groups of rotatable jet modules 79 are evenly installed on the side of the fracturing telescopic frame 77, and an array nozzle is provided on the upper part of the jet module 79. The array nozzle includes a main nozzle 791 in the center and an auxiliary nozzle 792 on the outside.

[0042] Two groups of ring reinforcement seats 8 are symmetrically arranged on the outside of the outer ring 1. The front end of the ring reinforcement seat 8 is provided with multiple groups of convex semi-solid ring frames 83. The bottom of the convex semi-solid ring frame 83 is provided with a linkage tray frame 84, and the upper part of the linkage tray frame 84 is provided with a hydraulic reinforcement telescopic frame 87.

[0043] like Figures 3 to 5 As shown, an inner cavity 71 is provided on the inner side of the fracturing module 7, four groups of fracturing holes 711 are provided on the side of the fracturing module 7, an isolation plate 712 is provided at the bottom of the inner cavity 71, a support frame 72 is installed in the middle position of the inner cavity 71, and second drive motors 73 are provided on four sides of the support frame 72. An extension rotating rod 74 is provided at the output end of the second drive motor 73, and a fracturing operation platform 75 is provided at the front end of the extension rotating rod 74.

[0044] like Figures 3 to 8 As shown, a fracturing hydraulic pump 76 is provided at the front end of the fracturing work platform 75, a fracturing telescopic frame 77 is provided at the front end of the fracturing telescopic frame 77, a third driving motor 78 is provided on the outer side of the front end of the fracturing telescopic frame 77, an injection shaft 781 is provided at the output end of the third driving motor 78, a jet module 79 is provided at the front end of the injection shaft 781, a jet pipe 731 is provided at the bottom of the second driving motor 73, one end of the jet pipe 731 passes through the second driving motor 73, the extension rod 74 and the center position of 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, and the bottom of the high-pressure fracturing channel 4 can be connected to an external high-pressure fracturing equipment.

[0045] Furthermore, the second drive motor 73 is started, and the second drive motor 73 drives the extension rotating rod 74 to rotate, and the extension rotating rod 74 drives the fracturing work platform 75, the fracturing hydraulic pump 76, the fracturing telescopic frame 77, the jet module 79 and the front-end 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, and the fracturing telescopic frame 77 drives the extension drill bit 80 to approach the coal seam walls on both sides and drill holes into the inside thereof, and the drilling distance is greater than 10 cm.

[0046] Furthermore, the jet shaft 781 drives the jet module 79 to rotate, and 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, the 6 holes are evenly distributed, and the jet angle is 15°. The diameter of the auxiliary nozzle 792 is 0.5 mm, the 12 holes are in a circular array, and the jet angle is 45°. The injection angle and direction are increased while rotating, thereby improving the fracturing effect.

[0047] Embodiment 2 provided by the present invention:

[0048] like Figures 2 to 6 and attached Figure 8 As shown, in one embodiment of the present invention, a dynamic coal seam gas extraction device based on fracturing and hole fixing is provided. On the basis of Example 1, the side of the grouting channel 5 is connected to a grouting hole 51, and the bottom of the grouting channel 5 can be connected to the grouting equipment on the outside.

[0049] 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 close the grouting hole 51 .

[0050] Furthermore, during the grouting operation, the slurry is sprayed into the channel and the formed fractures through the grouting channel 5 and the grouting hole 51, further reinforcing the channel. At the same time, the fracture network formed by the fracture is used as a slurry diffusion channel to form a three-dimensional network skeleton structure, reinforcing the fractures and improving the subsequent extraction effect.

[0051] like Figures 1 to 3 , Attachment Figure 11 and attached Figure 12 As shown, a gas extraction channel 6 is provided with an extraction hole 61 on the side, a slide rail 611 is provided inside the extraction hole 61, a extraction channel 612 is provided at the front end of the extraction hole 61, and a fourth drive motor 62 is installed at the center position inside the extraction hole 61. The gas extraction channel 6 can be connected to the extraction equipment on the outside.

[0052] The output end of the fourth driving motor 62 is provided with an extraction screw 63, and a slide 64 is sleeved on the extraction screw 63. An extraction platform 65 is installed at the front end of the slide 64. Slide blocks 651 are provided on both sides of the extraction platform 65. The slide blocks 651 are slidably connected to the slide rail 611. A connecting frame 66 is provided on the upper part of the extraction platform 65, and a blocking column 67 is installed at the front end of the connecting frame 66.

[0053] like Figures 2 to 10 As shown, a fifth drive motor 81 is provided at the front end of the ring reinforcement seat 8 , a reinforcement screw rod 82 is provided at the output end of the fifth drive motor 81 , and a convex semi-solid ring frame 83 is sleeved on the upper part of the reinforcement screw rod 82 .

[0054] A clamping seat 85 is installed at the bottom of the ring reinforcement seat 8, a clamping hydraulic pump 86 is installed at the front end of the clamping hydraulic pump 86, a hydraulic reinforcement telescopic frame 87 is provided at the front end of the hydraulic reinforcement telescopic frame 87, 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.

[0055] Furthermore, the reinforcing screw rod 82 drives the upper convex semi-solid ring frame 83 to move forward. When the front convex semi-solid ring frame 83 moves out of the reinforcing screw rod 82 and falls on the linkage tray frame 84, the fifth drive motor 81 stops working and the hydraulic pump 86 starts working at the same time. Through four sets of hydraulic reinforcement telescopic frames 87, one set of convex semi-solid ring frames 83 is pressed into the coal seam extraction drill hole to perform reinforcement operation.

[0056] Working principle:

[0057] According to the design requirements, the operator starts the first drive motor 9 to drive the main drill bit 10 to rotate, drills the device to various suitable positions to form coal seam extraction holes, and stops operating at various positions.

[0058] Next, the second drive motor 73 is started, and the second drive motor 73 drives the extension rotating rod 74 to rotate, and the extension rotating rod 74 drives the fracturing work platform 75, the fracturing hydraulic pump 76, the fracturing telescopic frame 77, the jet module 79 and the front-end 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, and the fracturing telescopic frame 77 drives the extension drill bit 80 to approach the coal seam walls on both sides and drill holes into the inside thereof, with a drilling distance greater than 10 cm.

[0059] After the extension drilling is completed, the third drive motor 78 is started, and the third drive motor 78 drives the injection shaft 781 to rotate, and the injection shaft 781 drives the jet module 79 to rotate, and 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 2mm, the 6 holes are evenly distributed, and the jet angle is 15°. The diameter of the auxiliary nozzle 792 is 0.5mm, the 12 holes are in a circular array, and the jet angle is 45°. The injection angle and direction are increased while rotating to improve the fracturing effect.

[0060] After the fracturing is completed, the first reinforcement is carried out and the fifth drive motor 81 is started. The fifth drive motor 81 drives the reinforcement screw 82 to rotate, and the reinforcement screw 82 drives its upper convex semi-solid ring frame 83 to move forward. When the front convex semi-solid ring frame 83 moves out of the reinforcement screw 82 and falls on the linkage tray frame 84, the fifth drive motor 81 stops operating and at the same time, the hydraulic pump 86 is tightened to start operating. Through four sets of hydraulic reinforcement telescopic frames 87, one set of convex semi-solid ring frames 83 is pressed into the coal seam extraction drill hole to perform reinforcement operation.

[0061] Next, the second reinforcement is carried out, and the grouting hydraulic pump 52 is started. The grouting hydraulic pump 52 drives the grouting telescopic frame 53 to be retracted, thereby opening the retaining ring frame 54, so that the grouting channel 5 and the grouting hole 51 are connected, and the grouting channel 5 is started. The grouting equipment connected to the outside is started, and the slurry is sprayed into the channel and the formed fracture through the grouting channel 5 and the grouting hole 51, further reinforcing the channel. At the same time, the fracture network formed by the fracture is used as a slurry diffusion channel to form a three-dimensional network skeleton structure, reinforce the fracture, and improve the subsequent extraction effect.

[0062] Finally, the extraction operation is carried out and the fourth drive motor 62 is started. The fourth drive motor 62 drives the extraction screw 63 to rotate, and the extraction screw 63 drives the slide 64 and the front extraction platform 65 to move backward, thereby retracting the blocking column 67 and opening the extraction channel 612. Then the outer extraction equipment connected to the gas extraction channel 6 starts to operate, and the extraction operation is carried out through the extraction channel 612 and the gas extraction channel 6.

[0063] Embodiment 3 provided by the present invention:

[0064] This embodiment provides a method for using the dynamic coalbed gas extraction device based on fracturing and pore fixing described in Example 1 or Example 2, and the steps are as follows:

[0065] S1. The main drill bit 10 drives the device to drill to various suitable (extraction-capable) locations to form coal seam extraction boreholes, and stops operating at each location;

[0066] S2: Perform fracturing operation. Extend the drill bit 80 to drill into the coal seams on both sides. 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. The equipment starts to spray fracturing fluid. At the same time, the third drive motor 78 starts to operate, driving the jet module 79 to rotate.

[0067] S3, the first reinforcement, start the fifth drive 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 one set of convex semi-solid ring frames 83 into the coal seam extraction drill hole through four sets of hydraulic reinforcement telescopic frames 87 to perform reinforcement operation;

[0068] S4, the second reinforcement, open the retaining ring frame 54, start the grouting equipment connected to the grouting channel 5 and the outside, and inject slurry into the channel and the pressure fracture formed in S2 through the grouting channel 5 and the grouting hole 51, further reinforcing the channel. At the same time, the fracture network formed by the pressure fracture is used as a slurry diffusion channel to form a three-dimensional network skeleton structure, reinforcing the pressure fracture and improving the subsequent extraction effect;

[0069] S5. Perform extraction operation, start the fourth drive motor 62, retract the blocking column 67 and open the extraction channel 612, then the outer extraction equipment connected to the gas extraction channel 6 starts to operate, and the extraction operation is performed through the extraction channel 612 and the gas extraction channel 6.

[0070] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are 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 direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0071] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A dynamic coal seam gas extraction device based on fracturing and hole fixing, comprising an outer ring (1), characterized in that: 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 extraction channel (6) is formed inside the inner ring (3), a fracturing module (7) is arranged on the top of the outer ring (1), a first drive motor (9) is arranged on the top of the fracturing module (7), and the output end of the first drive motor (9) is connected to a main drill bit (10); The grouting channel (5) is connected to a grouting hole (51) on the side, and the bottom of the grouting channel (5) can be connected to the grouting equipment on the outside. The top of the grouting channel (5) is provided with a grouting hydraulic pump (52), and the bottom of the grouting hydraulic pump (52) is provided with a grouting telescopic frame (53). The bottom of the grouting telescopic frame (53) is installed with a retaining ring frame (54), and the retaining ring frame (54) can close the grouting hole (51). The grouting liquid is sprayed into the duct and the pressure crack through the grouting channel (5) and the grouting hole (51) to reinforce the duct, and the crack network formed by the pressure crack is used as a slurry diffusion channel to form a three-dimensional network skeleton structure to reinforce the pressure crack; The gas extraction channel (6) is provided with an extraction hole (61) on the side thereof, a fourth drive motor (62) is installed at the center position inside the extraction hole (61), an extraction screw rod (63) is provided at the output end of the fourth drive motor (62), a slide (64) is sleeved on the extraction screw rod (63), an extraction platform (65) is installed at the front end of the slide (64), a connecting frame (66) is provided on the upper part of the extraction platform (65), and a blocking column (67) is installed at the front end of the connecting frame (66); A fracturing telescopic frame (77) is provided inside the fracturing module (7), an extension drill bit (80) is provided at the front end of the fracturing telescopic frame (77), five groups of rotatable jet modules (79) are evenly installed on the side of the fracturing telescopic frame (77), and an array nozzle is provided on the upper part of the jet module (79), the array nozzle includes a main nozzle (791) at the center and auxiliary nozzles (792) at the outer side, the jet module (79) can drive the main nozzle (791) and the auxiliary nozzle (792) at the upper part thereof to rotate, and the jet angle of the main nozzle (791) is 15°, and the jet angle of the auxiliary nozzle (792) is 45°; Two groups of ring reinforcement seats (8) are symmetrically arranged on the outside of the outer ring (1), a fifth drive motor (81) is arranged at the front end of the ring reinforcement seat (8), a reinforcement screw rod (82) is arranged at the output end of the fifth drive motor (81), a convex semi-solid ring frame (83) is sleeved on the upper part of the reinforcement screw rod (82), a linkage tray frame (84) is arranged at the bottom of the convex semi-solid ring frame (83), a hydraulic reinforcement telescopic frame (87) is arranged on the upper part of the linkage tray frame (84), a fixed column (88) is arranged at the bottom of the hydraulic reinforcement telescopic frame (87), and a linkage tray frame (84) is arranged at the bottom of the fixed column (88), and four groups of the hydraulic reinforcement telescopic frames (87) can press one group of convex semi-solid ring frames (83) into the coal seam extraction drilling hole.

2. The dynamic coalbed gas extraction device based on fracturing and pore consolidation according to claim 1 is characterized in that: An inner cavity (71) is provided on the inner side of the fracturing module (7), four groups of fracturing holes (711) are provided on the side of the fracturing module (7), an isolation plate (712) is provided at the bottom of the inner cavity (71), a support frame (72) is installed in the middle of the inner cavity (71), a second drive motor (73) is provided on four sides of the support frame (72), an extension rod (74) is provided at the output end of the second drive motor (73), a fracturing operation platform (75) is provided at the front end of the extension rod (74), a fracturing hydraulic pump (76) is provided at the front end of the fracturing operation platform (75), and a fracturing telescopic frame (77) is provided at the front end of the fracturing hydraulic pump (76). A third drive motor (78) is provided on the outer side of the front end of the fracturing telescopic frame (77), an injection shaft (781) is provided at the output end of the third drive motor (78), a jet module (79) is provided at the front end of the injection shaft (781), a jet pipe (731) is provided at the bottom of the second drive motor (73), one end of the jet pipe (731) passes through the second drive motor (73), the extension rod (74) and the center position of the fracturing telescopic frame (77) and is connected to the jet module (79), and the other end of the jet pipe (731) is connected to the high-pressure fracturing channel (4), and the bottom of the high-pressure fracturing channel (4) can be connected to an external high-pressure fracturing device.

3. The dynamic coalbed gas extraction device based on fracturing and pore consolidation according to claim 2 is characterized in that: A slide rail (611) is provided inside the extraction hole (61), and an extraction channel (612) is provided at the front end of the extraction hole (61). The gas extraction channel (6) can be connected to an extraction device on the outside; sliders (651) are provided on both sides of the extraction platform (65), and the sliders (651) are slidably connected to the slide rail (611).

4. The dynamic coalbed gas extraction device based on fracturing and pore consolidation according to claim 3 is characterized in that: A compression seat (85) is installed at the bottom of the ring reinforcement seat (8), a compression hydraulic pump (86) is installed at the front end of the compression seat (85), and a hydraulic reinforcement telescopic frame (87) is provided at the front end of the compression hydraulic pump (86).

5. A method for using the dynamic coalbed gas extraction device based on fracturing and pore consolidation according to claim 4, characterized in that: The steps include: S1, the main drill bit (10) drives the device to drill to each extraction position to form a coal seam extraction borehole, and stops operating at each position; S2, perform fracturing operation, extend the drill bit (80) to drill into the coal seams on both sides, 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 spray fracturing fluid, and at the same time, the third drive motor (78) starts to operate, driving the jet module (79) to rotate; S3, the first reinforcement, start the fifth drive motor (81), drop the convex semi-solid ring frame (83) on 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 four groups of hydraulic reinforcement telescopic frames (87) to perform reinforcement operation; S4, the second reinforcement, open the retaining ring frame (54), start the grouting channel (5) and the grouting equipment connected to the outside, and inject the slurry into the channel and the pressure fracture formed by S2 through the grouting channel (5) and the grouting hole (51), further reinforcing the channel. At the same time, the fracture network formed by the pressure fracture is used as a slurry diffusion channel to form a three-dimensional network skeleton structure, reinforcing the pressure fracture and improving the later extraction effect; S5. Perform the extraction operation, start the fourth drive motor (62), retract the blocking column (67) and open the extraction channel (612), then the outer extraction equipment connected to the gas extraction channel (6) starts to operate, and the extraction operation is performed through the extraction channel (612) and the gas extraction channel (6).

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