A mine hard roof hydraulic fracturing test equipment and use method thereof

Abstract

The invention discloses a hydraulic fracturing test equipment for a hard roof of a mine, and belongs to the technical field of hydraulic fracturing. An inner drill shaft is arranged at the output end of an inner drill driving motor, an inner drill bit is installed at the rear end of the inner drill shaft, and a water pipe head end is connected to the rear end of a mounting frame. A method for using the hydraulic fracturing test equipment for a hard roof of a mine is also disclosed. The invention conveniently links with a detection module by installing an electromagnetic clamp shaft, and at the same time utilizes a technical method for detecting the stability of an engineering rock mass by using seismic waves emitted after the rock mass is deformed and destroyed by force. By collecting waveforms to invert information such as the time, position, and energy distribution of rock mass rupture, two sets of drilling equipment, namely a drilling head and an inner drill bit, conveniently realize the effects of forming a fracturing channel on the hard roof and reversely recovering the drilling equipment, forming multiple plugging layers in one fracturing channel, thereby performing multiple staged fracturing, achieving full fracturing, and improving the weakening effect of the roof, and hydraulic fracturing can be performed simultaneously, thereby improving the operation efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of hydraulic fracturing, and in particular provides a mine hard roof hydraulic fracturing test equipment and a use method thereof. Background Art

[0002] With the promotion and application of comprehensive mechanized coal mining technology, the mining intensity of coal mining faces has increased significantly, which has brought great challenges to the safety management of the roof, and the problem of strong mine pressure has become increasingly serious. When the roof of the mined coal seam is a hard roof, coal mines often face problems such as obvious mining pressure and large suspended areas in the goaf during mining. This has brought certain restrictions to the control of surrounding rock in the advanced support section of the mining tunnel, gas control in the goaf, and roof management of the mining face. Realizing roof weakening and ensuring the timely collapse of the roof are effective measures to achieve the treatment of hard roofs on coal mining faces. At present, the commonly used roof weakening technologies in mines include blasting, intensive drilling, etc., all of which have problems such as vibration and impact, generation of harmful gases, and poor weakening effects to varying degrees.

[0003] Hydraulic fracturing uses high-pressure water as a medium, which expands in hard rock formations to achieve the purpose of artificially creating cracks and destroying the integrity of the roof, thereby weakening the roof. Its application in underground coal mines is on the rise.

[0004] The patent application with publication number CN112647921A provides a coal mine underground hydraulic fracturing experimental laboratory simulation system. In view of the fact that the existing simulation systems and methods cannot meet different underground pressure conditions, the research on the underground hydraulic fracturing experimental laboratory simulation system and method for drilling along the roadway is relatively simple and less, and the following scheme is proposed, which includes a bottom plate, a simulation seat is fixedly installed on the top of the bottom plate, a plurality of simulation slots are opened on the top of the simulation seat, a solid reservoir is installed in each of the plurality of simulation slots, and an adjustment chamber is opened in each of the plurality of solid reservoirs, side plates are fixedly installed on both sides of the simulation seat, and the top of the two side plates is fixedly installed with the same top plate. The simulation system and method of the present invention can simulate and meet different underground pressure conditions, and the research on the underground hydraulic fracturing experimental laboratory simulation system and method for drilling is relatively rich, and the experimental results are more reference-oriented and auxiliary.

[0005] Although the above technical solutions improve the effect of hydraulic pressure relief to a certain extent, there are still some problems: first, the operation process is complicated; second, the detection device is inconvenient to disassemble and assemble.

[0006] In summary, it is of great significance to carry out research on hydraulic fracturing test technology for hard roof of mines. Summary of the Invention

[0007] In order to solve the above problems, the present invention provides a mine hard roof hydraulic fracturing test equipment and a method of using the same.

[0008] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a mine hard roof hydraulic fracturing test equipment, comprising a base, a movable wheel base is installed on the lower surface of the base, and movable wheels are provided on the movable wheel base, a hydraulic telescopic support frame is provided on the upper surface of the base, and two groups of four hydraulic telescopic support frames are provided, an operating table is provided on the upper end of the hydraulic telescopic support frame, a first support frame is slidably assembled on the upper surface of the operating table, a drilling drive motor is provided on the upper end of the first support frame, the output end of the drilling drive motor is connected to the rear end of the drilling shaft, the front end of the drilling shaft is clamped with a drilling head, the rear end of the drilling head is provided with a support frame, and the support frame is clamped to the front end of the drilling shaft;

[0009] An inner drill drive motor is installed at the rear end of the support frame, an inner drill shaft is provided at the output end of the inner drill drive motor, an inner drill bit is installed at the rear end of the inner drill shaft, a mounting frame is fixedly connected to the rear end of the inner drill drive motor, a water pipe head end is connected to the rear end of the water pipe head end, and a water pipe is installed at the rear end of the water pipe head end, and slurry blocking seats are evenly installed on the water pipe;

[0010] A storage rack is provided in the middle of the upper surface of the base, and a detection module and an installation module are placed in the storage rack.

[0011] Furthermore, a first hydraulic pump is provided on the upper surface of the base, and there are four first hydraulic pumps in total. A hydraulic telescopic shaft is installed on the lower surface of each of the first hydraulic pumps. An anti-slip support plate is provided at the lower end of each of the hydraulic telescopic shafts, and the anti-slip support plate is close to the moving wheel base.

[0012] Furthermore, a second hydraulic pump is provided on the side of the hydraulic telescopic support frame, one group of hydraulic telescopic support frames is provided with a flip seat at the upper and lower ends, and another group of hydraulic telescopic support frames is provided with a flip seat at the upper end and the lower end is fixedly connected to the base.

[0013] Furthermore, a sliding track is provided on the upper surface of the workbench, the first support frame is nested in the sliding track, a second support frame is fixedly installed on the front end of the sliding track, a guide ring frame is provided on the upper end of the second support frame, and the drilling shaft passes through the guide ring frame.

[0014] Furthermore, a guide drive motor is installed on the side surface of the workbench, the output end of the guide drive motor is connected to a guide screw rod parallel to the sliding track, and the first support frame is screwed on the guide screw rod, and a power module is installed on one side of the lower surface of the workbench.

[0015] Furthermore, the front end of the drilling shaft is provided with a shaft head connecting frame, the inner surface of the shaft head connecting frame is provided with an inner groove, the bottom of the inner cavity of the inner groove is provided with an electromagnetic seat and a reset spring, the outer end of the reset spring is connected to a bracket block, the bottom of the bracket block is provided with an adsorption seat corresponding to the electromagnetic seat, and the interior of the drilling shaft is provided with a drilling inner groove;

[0016] Grouting connection holes are symmetrically provided at the rear end of the drilling shaft, and a grouting pipe is provided on the inner wall of the drilling shaft, and the grouting pipe is connected to the grouting connection hole;

[0017] A slot opening is provided at the rear of the drilling head, and the shaft head connecting frame is inserted into the slot opening.

[0018] Furthermore, the inner side of the inner drill bit is hollow, and a leak-proof swivel is provided on the inner side of the inner drill bit;

[0019] The mounting frame passes through the inner side of the inner drill bit and is fixedly connected to the inner drill drive motor. A swivel groove is provided on the outer surface of the mounting frame. A swivel ball is provided in the swivel groove. The leak-proof swivel is nested in the swivel groove.

[0020] Furthermore, the outer surface of the water pipe is provided with a hydraulic fracturing drainage hole, the rear end of the outer surface of the water pipe is provided with a water connection hole, the outer surface of the water pipe is provided with a water pressure sensor, and the rear end of the water pipe is provided with a water pipe receiver connection frame;

[0021] A tightening ring frame is provided on the inner side of the slurry blocking seat, a fixing bolt is provided on the outer surface of the slurry blocking seat, a layered crushing drive motor is provided at the rear end of the slurry blocking seat, a layered crushing rotating ring shaft is provided at the output end of the layered crushing driving motor, and a layered crushing drill bit is connected to the rear end of the layered crushing rotating ring shaft.

[0022] Furthermore, during operation, the drilling head drills into the hard roof coal seam to form a fracturing channel;

[0023] The detection module is installed in the hard roof coal seam through the installation module. The installation module includes an installation drive motor, an installation shaft is provided at the output end of the installation drive motor, an electromagnetic clamping shaft is provided at the front end of the installation shaft, and a handle is provided at the rear of the installation drive motor. There are two groups of handles, one group of handles is installed with a motor controller inside, and the other group of handles is installed with an electromagnetic clamping shaft controller inside.

[0024] The detection module includes a detection drill bit, a microseismic sensor and a detection rotating shaft frame. The microseismic sensor is set at the rear end of the detection drill bit, and the detection rotating shaft frame is set at the rear end of the microseismic sensor. The rear end of the detection rotating shaft frame is equipped with an adsorption socket corresponding to the installation of the electromagnetic card shaft.

[0025] A method for using a mine hard roof hydraulic fracturing test device comprises the following steps:

[0026] S1. Equipment preparation: Move the equipment to the location where drilling is required on the hard roof coal seam, adjust the drilling angle, and install the detection module into the hard roof coal seam through the installation module;

[0027] S2, forming a fracturing channel, starting the drilling drive motor, and drilling into the hard roof coal seam through the drilling head to form a fracturing channel;

[0028] S3, withdraw the shaft, connect the grouting equipment externally, separate the drilling shaft from the drilling head, and slowly withdraw the drilling shaft from the fracturing channel;

[0029] S4, layered plugging, the drilling shaft withdraws and stops moving whenever it reaches the plugging seat, and the external grouting equipment performs grouting operations to form a plugging layer on the upper part of the plugging seat, realizing multiple staged fracturing in one fracturing channel;

[0030] S5, water injection fracturing, after the drilling shaft is completely out of the fracturing channel, the water pipe leaks out, it is connected to the external water injection equipment, and high-pressure water injection begins. The water pressure of the hydraulic fracturing borehole is 20-33MPa, and the pressure holding time is 30-60min;

[0031] S6. Monitoring: During hydraulic fracturing, the rock mass is deformed and damaged by stress, emitting seismic waves. Microseismic sensors collect seismic wave waveforms to invert the time, location, and energy distribution of rock mass rupture.

[0032] S7. Retract the pipe and connect the water pipe to the external storage and stretching equipment. Start the internal drilling drive motor and the layered crushing drive motor. The external storage and stretching equipment pulls the water pipe outward. The internal drill bit and the layered crushing drill bit drill through the corresponding leak-proof layers. Then the water pipe is moved out of the fracturing channel.

[0033] The beneficial effects of using the present invention are:

[0034] The detection module is easy to use. The present invention realizes easy installation and disassembly of the detection module by conveniently linking the installation electromagnetic clamp shaft in the installation module. At the same time, the technical method of detecting the stability of the engineering rock mass is used to detect the seismic waves emitted after the rock mass is deformed and damaged by force. By collecting waveforms to invert the time, position, energy distribution and other information of rock mass fracture, the dominant fracture surface of the rock mass is inferred in advance, and then the rock mass state is evaluated, the detection operation is facilitated, and the detection effect is improved.

[0035] To improve the efficiency of hydraulic fracturing operations, the present invention uses two sets of drilling equipment, namely a drilling head and an inner drill bit, to form a fracturing channel on a hard roof and to reversely recover the drilling equipment. Moreover, during reverse drilling, the provision of a leak-proof swivel and a rotating ball prevents foreign matter from entering the inner drill bit and affecting the use of the equipment while ensuring the normal reverse drilling and recovery operations.

[0036] The hydraulic fracturing effect is improved. The present invention forms multiple plugging layers in a fracturing channel so that multiple staged fracturing can be performed, achieving full fracturing and improving the roof weakening effect. In addition, hydraulic fracturing can be performed simultaneously, thereby improving operation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 2. It is a schematic structural diagram of a mine hard roof hydraulic fracturing test equipment according to an embodiment of the present invention;

[0038] Figure 2 It is a rear view of a mine hard roof hydraulic fracturing test equipment in one embodiment of the present invention;

[0039] Figure 3 This is a schematic diagram of a drilling operation of a mine hard roof hydraulic fracturing test equipment according to an embodiment of the present invention;

[0040] Figure 4 This is a schematic diagram of the drilling operation and detection module installation structure of a mine hard roof hydraulic fracturing test equipment in one embodiment of the present invention;

[0041] Figure 5 This is a cross-sectional view of a borehole of a hydraulic fracturing test equipment for a hard roof of a mine according to an embodiment of the present invention;

[0042] Figure 6 This invention Figure 5 A partial enlarged view of the middle A;

[0043] Figure 7 This invention Figure 5 A partial enlarged view of point B in the middle;

[0044] Figure 8 This is a partial schematic diagram of a drilling shaft and a drilling head separated from each other in a hydraulic fracturing test equipment for a hard roof of a mine according to an embodiment of the present invention;

[0045] Figure 9 This is a partial enlarged view of the drilling shaft of a mine hard roof hydraulic fracturing test equipment in one embodiment of the present invention;

[0046] Figure 10 This is a schematic diagram of the structure of a water pipe and a drilling head of a mine hard roof hydraulic fracturing test equipment according to one embodiment of the present invention;

[0047] Figure 11 Schematic diagram of the structure of the fracturing channel formed by the hydraulic fracturing test equipment for the hard roof of a mine according to one embodiment of the present invention;

[0048] Figure 12 Schematic diagram of the installation structure of the detection module of the mine hard roof hydraulic fracturing test equipment in one embodiment of the present invention;

[0049] Figure 13 1. It is a schematic structural diagram of a detection module of a mine hard roof hydraulic fracturing test equipment in one embodiment of the present invention;

[0050] Figure 14The figure is a schematic diagram of the structure of the installation module of the mine hard roof hydraulic fracturing test equipment in one embodiment of the present invention.

[0051] In the figure: 1. base, 2. hydraulic telescopic support frame, 3. workbench, 4. mobile wheel base, 5. storage rack, 6. first hydraulic pump, 7. drilling drive motor, 8. drilling shaft, 9. drilling head, 10. mounting module, 11. hard roof coal seam, 12. support frame, 13. inner drilling drive motor, 14. mounting frame, 15. water pipe, 16. slurry plugging seat, 17. plugging layer, 18. detection module, 19. layered crushing drive motor, 21. second hydraulic pump, 22. flip seat, 31. sliding rail, 32. second support frame, 33. first support frame, 34. guide drive motor, 35. guide screw, 36. power module, 61. hydraulic telescopic shaft, 62. anti-slip support plate, 80. shaft head connecting frame, 81. inner groove, 82. grouting connection hole, 83. grouting pipe, 84. inner groove of drilling hole, 91. slot opening, 10 1. Install the drive motor, 102. Install the rotating shaft, 103. Install the electromagnetic clamp shaft, 104. Handle frame, 105. Motor controller, 106. Electromagnetic clamp shaft controller, 111. Fracturing channel, 131. Inner drill shaft, 132. Inner drill bit, 141. Swivel groove, 142. Rotating ball, 151. Water pipe head, 152. Hydraulic fracturing drainage hole, 153. Water connection hole, 154. Water pressure sensor, 1 55. Water pipe storage connection frame, 161. Fixing bolt, 162. Tightening ring frame, 181. Detection drill bit, 182. Micro-seismic sensor, 183. Detection shaft frame, 184. Adsorption socket, 191. Layered crushing swivel shaft, 192. Layered crushing drill bit, 321. Guide ring frame, 811. Electromagnetic seat, 812. Reset spring, 813. Adsorption seat, 814. Card holder block, 1321. Leak-proof swivel. DETAILED DESCRIPTION

[0052] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0053] Example 1

[0054] Reference Figures 1 to 3A hydraulic fracturing test equipment for a hard roof of a mine includes a base 1, a movable wheel base 4 is installed on the lower surface of the base 1, and a movable wheel is provided on the movable wheel base 4, a hydraulic telescopic support frame 2 is provided on the upper surface of the base 1, and the hydraulic telescopic support frame 2 is provided in two groups, a total of four, an operating platform 3 is provided on the upper end of the hydraulic telescopic support frame 2, a first support frame 33 is slidably assembled on the upper surface of the operating platform 3, a drilling drive motor 7 is provided on the upper end of the first support frame 33, the output end of the drilling drive motor 7 is connected to the rear end of the drilling shaft 8, the front end of the drilling shaft 8 is clamped with a drilling head 9, a support frame 12 is provided at the rear end of the drilling head 9, and the support frame 12 is clamped to the front end of the drilling shaft 8.

[0055] like Figures 2 to 5 As shown, an inner drill drive motor 13 is installed at the rear end of the support frame 12, an inner drill shaft 131 is provided at the output end of the inner drill drive motor 13, an inner drill bit 132 is installed at the rear end of the inner drill shaft 131, a mounting frame 14 is fixedly connected to the rear end of the inner drill drive motor 13, a water pipe head end 151 is connected to the rear end of the mounting frame 14, a water pipe 15 is installed at the rear end of the water pipe head end 151, and a slurry blocking seat 16 is evenly installed on the water pipe 15.

[0056] A first hydraulic pump 6 is provided on the upper surface of the base 1, and there are four first hydraulic pumps 6 in total. A hydraulic telescopic shaft 61 is installed on the lower surface of the first hydraulic pump 6. The lower end of the hydraulic telescopic shaft 61 is provided with an anti-slip support plate 62, and the anti-slip support plate 62 is close to the moving wheel base 4.

[0057] Specifically, a second hydraulic pump 21 is provided on the side of the hydraulic telescopic support frame 2, and a group of hydraulic telescopic support frames 2 are respectively provided with a flip seat 22 at the upper and lower ends, and another group of hydraulic telescopic support frames 2 is provided with a flip seat 22 at the upper end and the lower end is fixedly connected to the base 1.

[0058] Specifically, a sliding track 31 is provided on the upper surface of the workbench 3, a first support frame 33 is nested in the sliding track 31, a second support frame 32 is fixedly installed at the front end of the sliding track 31, a guide ring frame 321 is provided at the upper end of the second support frame 32, and the drilling shaft 8 passes through the guide ring frame 321.

[0059] Specifically, a guide drive motor 34 is installed on the side surface of the workbench 3, the output end of the guide drive motor 34 is connected to a guide screw 35 parallel to the sliding track 31, and the first support frame 33 is screwed to the guide screw 35, and a power module 36 is installed on one side of the lower surface of the workbench 3.

[0060] The guide drive motor 34 is run forward to drive the drilling shaft 8 to move forward, and the drilling drive motor 7 is run at the same time to drive the drilling head 9 to rotate, so that the drilling work can be carried out.

[0061] A controller is installed in the power module 36, which is used to control the operation of the first hydraulic pump 6, the drilling drive motor 7, the internal drilling drive motor 13, the layered crushing drive motor 19, the second hydraulic pump 21, the guide drive motor 34, and the electromagnetic seat 811, and can be connected to an external controller via wired or wireless means.

[0062] Example 2

[0063] like Figures 5 to 9 As shown, in one embodiment of the present invention, a hydraulic fracturing test equipment for a hard roof of a mine, based on the first embodiment, a shaft head connecting frame 80 is provided at the front end of the drilling shaft 8, an inner groove 81 is provided on the inner surface of the shaft head connecting frame 80, an electromagnetic seat 811 and a reset spring 812 are provided at the bottom of the inner cavity of the inner groove 81, the outer end of the reset spring 812 is connected to a bracket block 814, the bottom of the bracket block 814 is provided with an adsorption seat 813 corresponding to the electromagnetic seat 811, and a drilling inner groove 84 is provided inside the drilling shaft 8.

[0064] Grouting connection holes 82 are symmetrically provided at the rear end of the drilling shaft 8 , a grouting pipe 83 is provided on the inner wall of the drilling shaft 8 , and the grouting pipe 83 is communicated with the grouting connection hole 82 .

[0065] like Figures 5 to 10 As shown, a slot opening 91 is provided at the rear of the drilling head 9 , and the shaft head connecting frame 80 is inserted into the slot opening 91 .

[0066] Specifically, the inner side of the inner drill bit 132 is hollow, and a leak-proof swivel 1321 is provided on the inner side of the inner drill bit 132 .

[0067] The mounting frame 14 passes through the inner side of the inner drill bit 132 and is fixedly connected to the inner drill drive motor 13 . A swivel groove 141 is provided on the outer surface of the mounting frame 14 . A swivel ball 142 is provided in the swivel groove 141 . A leak-proof swivel 1321 is nested in the swivel groove 141 .

[0068] Specifically, a hydraulic fracturing drainage hole 152 is provided on the outer surface of the water pipe 15, a water connection hole 153 is provided at the rear end of the outer surface of the water pipe 15, a water pressure sensor 154 is provided on the outer surface of the water pipe 15, and a water pipe receiver connecting frame 155 is provided at the rear end of the water pipe 15.

[0069] A tightening ring frame 162 is provided on the inner side of the slurry blocking seat 16, a fixing bolt 161 is provided on the outer surface of the slurry blocking seat 16, a layered crushing drive motor 19 is provided at the rear end of the slurry blocking seat 16, a layered crushing rotating ring shaft 191 is provided at the output end of the layered crushing driving motor 19, and a layered crushing drill bit 192 is connected to the rear end of the layered crushing rotating ring shaft 191.

[0070] Specifically, if Figures 10 to 14 As shown, during operation, the drilling head 9 drills into the hard roof coal seam 11 to form a fracturing channel 111.

[0071] The detection module 18 is installed in the hard roof coal seam 11 through the installation module 10. The installation module 10 includes an installation drive motor 101. The output end of the installation drive motor 101 is provided with an installation shaft 102. The front end of the installation shaft 102 is provided with an installation electromagnetic clamping shaft 103. The rear part of the installation drive motor 101 is provided with a handle frame 104. There are two groups of handle frames 104. A motor controller 105 is installed on the inside of one group of handle frames 104, and an electromagnetic clamping shaft controller 106 is installed on the inside of the other group of handle frames 104.

[0072] The detection module 18 includes a detection drill bit 181, a microseismic sensor 182 and a detection rotating shaft frame 183. The microseismic sensor 182 is set at the rear end of the detection drill bit 181, and the detection rotating shaft frame 183 is set at the rear end of the microseismic sensor 182. The rear end of the detection rotating shaft frame 183 is installed with an adsorption socket 184 corresponding to the installation of the electromagnetic card shaft 103.

[0073] The detection module 18 placed in the storage rack 5 is installed to the corresponding position in the hard roof coal seam 11 through the installation module 10. During installation, hold two sets of handle frames 104 to insert the installation electromagnetic clamping shaft 103 into the adsorption socket 184, press the electromagnetic clamping shaft controller 106 to complete the adsorption installation of the detection module 18 and the installation module 10, then press the motor controller 105 to start the installation drive motor 101, drill the detection module 18 into the hard roof coal seam 11, then release the electromagnetic clamping shaft controller 106 to separate the installation module 10, and continue to install the next detection module 18.

[0074] Working principle:

[0075] Before drilling, an operation plan is designed. After completion, the equipment is moved to the set position through the movable wheel base 4, and the first hydraulic pump 6 is started. The anti-slip support plate 62 contacts the ground under the action of the hydraulic telescopic shaft 61 to prevent the equipment from sliding. Then the second hydraulic pump 21 is started, and the four hydraulic telescopic support frames 2 are raised and lowered to adjust the drilling angle.

[0076] Then, according to the design solution, the detection module 18 placed in the storage rack 5 is installed to a corresponding position in the hard roof coal seam 11 through the installation module 10 .

[0077] When drilling, the guide drive motor 34 is started, the guide wire rod 35 rotates, and the guide wire rod 35 drives the drilling drive motor 7 on the upper part of the first support frame 33 to move forward, and is connected to the external grouting equipment through two sets of grouting pipes 83. At the same time, the drilling drive motor 7 is started, and the drilling head 9 drills into the hard roof coal seam 11 to form a fracturing channel 111.

[0078] When the drilling head 9 has drilled to a certain position, the drilling drive motor 7 is stopped and the electromagnetic seat 811 is started. The electromagnetic seat 811 is energized to generate magnetism to suck the adsorption seat 813 and the bracket block 814 into the inner groove 81, so that the drilling shaft 8 is separated from the drilling head 9.

[0079] Then, the guide drive motor 34 is started in reverse, and the drilling shaft 8 withdraws outward from the fracturing channel 111. During the withdrawal process of the drilling shaft 8, it stops moving whenever it withdraws to the slurry blocking seat 16, and the external grouting equipment starts grouting operation. The slurry is transported to the upper part of the slurry blocking seat 16 through the grouting pipe 83, and a plugging layer 17 is formed on the upper part thereof. After being fixed, the drilling shaft 8 continues to move downward, and the above operation is repeated to form multiple plugging layers 17 in a fracturing channel 111, so that multiple staged fracturing can be carried out to achieve the effect of sufficient fracturing and improving the weakening effect of the top plate.

[0080] When the drilling shaft 8 is completely out of the fracturing channel 111, the water pipe 15 leaks out and is connected to the external water injection equipment through the water connection hole 153 to start high-pressure water injection. The water pressure of the hydraulic fracturing borehole is 20-33 MPa, and the pressure holding time is 30-60 minutes. The water pressure sensor 154 senses the water pressure information in each section in real time and transmits it to the external controller. During the drilling fracturing, some adjacent fracturing holes are watered, indicating that the gap expansion is good after hydraulic fracturing.

[0081] During hydraulic fracturing, the microseismic sensor 182 in the detection module 18 uses the technical method of detecting the stability of the engineering rock mass by using the seismic waves emitted after the rock mass is deformed and damaged by force, and transmits the collected acquisition waves to the external controller to invert the time, location, and energy distribution information of the rock mass rupture.

[0082] After the hydraulic fracturing operation is completed, the water pipe 15 is connected to the external storage and stretching equipment through the water pipe receiver connecting frame 155, and the inner drill drive motor 13 is started. The inner drill drive motor 13 drives the inner drill shaft 131 to rotate, and the inner drill shaft 131 drives the inner drill bit 132 to rotate. The inner drill bit 132 drills the corresponding plugging layer 17. Similarly, the layered crushing drive motor 19 is started, and the layered crushing drive motor 19 drives the layered crushing rotating ring shaft 191 to rotate. The layered crushing rotating ring shaft 191 drives the layered crushing drill bit 192 to rotate, and the layered crushing drill bit 192 drills the corresponding plugging layer 17. Finally, the water pipe 15 is easily moved out of the fracturing channel 111.

[0083] Finally, pick up the installation module 10, connect it to the detection module 18, press the electromagnetic clamping shaft controller 106 and the motor controller 105, pull the installation module 10 backward to remove the detection module 18.

[0084] Example 3

[0085] This embodiment provides a method for using the mine hard roof hydraulic fracturing test equipment of embodiment 1 or embodiment 2, and the steps are as follows:

[0086] S1. Equipment preparation: Move the equipment to the location where drilling is required on the hard roof coal seam 11, adjust the drilling angle, and install the detection module 18 into the hard roof coal seam 11 through the installation module 10;

[0087] S2, forming a fracturing channel, starting the drilling drive motor 7, and drilling into the hard roof coal seam 11 through the drilling head 9 to form a fracturing channel 111;

[0088] S3, withdraw the shaft, connect the external grouting equipment, separate the drilling shaft 8 from the drilling head 9, and slowly withdraw the drilling shaft 8 from the fracturing channel 111;

[0089] S4, layered plugging, the drilling shaft 8 is withdrawn, and whenever it withdraws to the slurry plugging seat 16, it stops moving, and the external grouting equipment performs grouting operation, forming a plugging layer 17 on the upper part of the slurry plugging seat 16, realizing multiple staged fracturing in one fracturing channel 111;

[0090] S5, water injection fracturing, after the drilling shaft 8 is completely withdrawn from the fracturing channel 111, the water pipe 15 leaks out, it is connected to the external water injection equipment, and high-pressure water injection is started. The water pressure of the hydraulic fracturing drilling is 20-33 MPa, and the pressure holding time is 30-60 minutes;

[0091] S6. Monitoring: During hydraulic fracturing, the rock mass is deformed and damaged by stress, emitting seismic waves. The microseismic sensor 182 collects seismic wave waveforms to invert the time, location, and energy distribution of rock mass rupture.

[0092] S7, withdraw the pipe, connect the water pipe 15 to the external storage and stretching equipment, start the internal drilling drive motor 13 and the layered crushing drive motor 19, the external storage and stretching equipment pulls the water pipe 15 outward, the internal drill bit 132 and the layered crushing drill bit 192 drill through the corresponding plugging layers 17, and then the water pipe 15 moves out of the fracturing channel 111.

[0093] 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.

[0094] The above content is only a preferred embodiment of the present invention. For ordinary technicians in this field, according to the concept of the present invention, many changes can be made in the specific implementation method and application scope. As long as these changes do not deviate from the concept of the present invention, they all fall within the scope of protection of the present invention.

Claims

1. A mine hard roof hydraulic fracturing test equipment, characterized by: The invention comprises a base (1), a movable wheel base (4) is installed on the lower surface of the base (1), and a movable wheel is arranged on the movable wheel base (4), a hydraulic telescopic support frame (2) is arranged on the upper surface of the base (1), and the hydraulic telescopic support frame (2) is arranged in two groups, a total of four, a workbench (3) is arranged on the upper end of the hydraulic telescopic support frame (2), a first support frame (33) is slidably mounted on the upper surface of the workbench (3), a drilling drive motor (7) is arranged on the upper end of the first support frame (33), the output end of the drilling drive motor (7) is connected to the rear end of a drilling shaft (8), the front end of the drilling shaft (8) is clamped with a drilling head (9), the rear end of the drilling head (9) is provided with a support frame (12), and the support frame (12) is clamped to the front end of the drilling shaft (8); An inner drill drive motor (13) is installed at the rear end of the support frame (12); an inner drill shaft (131) is provided at the output end of the inner drill drive motor (13); an inner drill bit (132) is installed at the rear end of the inner drill shaft (131); a mounting frame (14) is fixedly connected to the rear end of the inner drill drive motor (13); a water pipe head end (151) is connected to the rear end of the mounting frame (14); a water pipe (15) is installed at the rear end of the water pipe head end (151); and slurry blocking seats (16) are evenly installed on the water pipe (15); A storage rack (5) is provided in the middle of the upper surface of the base (1), and a detection module (18) and an installation module (10) are placed in the storage rack (5).

2. The mine hard roof hydraulic fracturing test equipment according to claim 1, characterized in that: The upper surface of the base (1) is provided with a first hydraulic pump (6), and there are four first hydraulic pumps (6) in total. The lower surfaces of the first hydraulic pumps (6) are all installed with hydraulic telescopic shafts (61). The lower ends of the hydraulic telescopic shafts (61) are all provided with anti-skid support plates (62), and the anti-skid support plates (62) are close to the moving wheel base (4).

3. The mine hard roof hydraulic fracturing test equipment according to claim 2, characterized in that: A second hydraulic pump (21) is provided on the side of the hydraulic telescopic support frame (2); one group of the hydraulic telescopic support frames (2) is provided with a turning seat (22) at both upper and lower ends; and another group of the hydraulic telescopic support frames (2) is provided with a turning seat (22) at the upper end and a lower end fixedly connected to the base (1).

4. The mine hard roof hydraulic fracturing test equipment according to claim 3 is characterized by: The upper surface of the workbench (3) is provided with a sliding track (31), the first support frame (33) is nested in the sliding track (31), a second support frame (32) is fixedly mounted at the front end of the sliding track (31), a guide ring frame (321) is provided at the upper end of the second support frame (32), and the drilling shaft (8) passes through the guide ring frame (321).

5. The mine hard roof hydraulic fracturing test equipment according to claim 4, characterized in that: A guide drive motor (34) is installed on the side surface of the workbench (3); an output end of the guide drive motor (34) is connected to a guide screw (35) parallel to the sliding track (31); and a first support frame (33) is screwed onto the guide screw (35); and a power module (36) is installed on one side of the lower surface of the workbench (3).

6. The mine hard roof hydraulic fracturing test equipment according to claim 5, characterized in that: The front end of the drilling shaft (8) is provided with a shaft head connecting frame (80), the inner surface of the shaft head connecting frame (80) is provided with an inner groove (81), the bottom of the inner cavity of the inner groove (81) is provided with an electromagnetic seat (811) and a return spring (812), the outer end of the return spring (812) is connected to a bracket block (814), the bottom of the bracket block (814) is provided with an adsorption seat (813) corresponding to the electromagnetic seat (811), and the interior of the drilling shaft (8) is provided with a drilling inner groove (84); The rear end of the drilling shaft (8) is symmetrically provided with grouting connection holes (82); the inner wall of the drilling shaft (8) is provided with a grouting pipe (83), and the grouting pipe (83) is in communication with the grouting connection hole (82); The rear portion of the drilling head (9) is provided with a slot opening (91), and the shaft head connecting frame (80) is inserted into the slot opening (91).

7. The mine hard roof hydraulic fracturing test equipment according to claim 6, characterized in that: The inner side of the inner drill bit (132) is hollow, and a leak-proof swivel (1321) is provided on the inner side of the inner drill bit (132); The mounting frame (14) passes through the inner side of the inner drill bit (132) and is fixedly connected to the inner drill drive motor (13); a swivel groove (141) is provided on the outer surface of the mounting frame (14); a swivel ball (142) is provided in the swivel groove (141); and the leak-proof swivel (1321) is nested in the swivel groove (141).

8. The mine hard roof hydraulic fracturing test equipment according to claim 7, characterized in that: The outer surface of the water pipe (15) is provided with a hydraulic fracturing drainage hole (152), the rear end of the outer surface of the water pipe (15) is provided with a water connection hole (153), the outer surface of the water pipe (15) is provided with a water pressure sensor (154), and the rear end of the water pipe (15) is provided with a water pipe receiver connection frame (155); A tightening ring frame (162) is provided on the inner side of the slurry blocking seat (16), a fixing bolt (161) is provided on the outer surface of the slurry blocking seat (16), a layered crushing drive motor (19) is provided at the rear end of the slurry blocking seat (16), a layered crushing rotating ring shaft (191) is provided at the output end of the layered crushing drive motor (19), and a layered crushing drill bit (192) is connected to the rear end of the layered crushing rotating ring shaft (191).

9. The mine hard roof hydraulic fracturing test equipment according to claim 8, characterized in that: The drilling head (9) drills into the hard roof coal seam (11) to form a fracturing channel (111); The detection module (18) is installed in the hard roof coal seam (11) through the installation module (10), the installation module (10) comprises an installation drive motor (101), the output end of the installation drive motor (101) is provided with an installation shaft (102), the front end of the installation shaft (102) is provided with an installation electromagnetic clamping shaft (103), the rear part of the installation drive motor (101) is provided with a handle frame (104), and there are two groups of handle frames (104), one group of the handle frames (104) has a motor controller (105) installed inside, and the other group of the handle frames (104) has an electromagnetic clamping shaft controller (106) installed inside. The detection module (18) comprises a detection drill bit (181), a microseismic sensor (182) and a detection shaft frame (183); the microseismic sensor (182) is arranged at the rear end of the detection drill bit (181); the detection shaft frame (183) is arranged at the rear end of the microseismic sensor (182); and the detection shaft frame (183) is installed at the rear end with an adsorption socket (184) corresponding to the installation of the electromagnetic clamp shaft (103).

10. A method for using the mine hard roof hydraulic fracturing test equipment according to claim 9, characterized in that: The steps include: S1, equipment preparation, moving the equipment to a position on the hard roof coal seam (11) where a hole needs to be drilled, adjusting the drilling angle, and installing the detection module (18) into the hard roof coal seam (11) through the installation module (10); S2, forming a fracturing channel, starting a drilling drive motor (7), and drilling into the hard roof coal seam (11) through a drilling head (9) to form a fracturing channel (111); S3, withdrawing the shaft, connecting an external grouting device, separating the drilling shaft (8) from the drilling head (9), and slowly withdrawing the drilling shaft (8) from the fracturing channel (111); S4, layered plugging, the drilling shaft (8) is withdrawn, and stops moving whenever it withdraws to the plugging seat (16), and an external grouting device performs grouting operations to form a plugging layer (17) on the upper part of the plugging seat (16), thereby realizing multiple staged fracturing in one fracturing channel (111); S5, water injection fracturing, after the drilling shaft (8) is completely withdrawn from the fracturing channel (111), the water pipe (15) leaks out, and it is connected to the external water injection equipment to start high-pressure water injection, the water pressure of the hydraulic fracturing drilling hole is 20 to 33 MPa, and the pressure holding time is 30 to 60 minutes; S6, monitoring, during hydraulic fracturing, the rock mass is deformed and damaged by force, and emits seismic waves. The microseismic sensor (182) collects seismic wave waveforms to invert the time, location, and energy distribution information of rock mass rupture; S7, withdraw the pipe, connect the water pipe (15) to the external storage and stretching equipment, start the internal drilling drive motor (13) and the layered crushing drive motor (19), and the external storage and stretching equipment pulls the water pipe (15) outward, and the internal drill bit (132) and the layered crushing drill bit (192) drill through the corresponding plugging layers (17), and then the water pipe (15) is moved out of the fracturing channel (111).

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