A high-energy photo-electric-power combined fracturing and permeability improvement test device and method

Abstract

The application discloses a kind of high-energy photo-electric-force combined fracturing permeability test device and method, test device includes: cuboid test piece, for coal sample;Loading pressure plate is respectively arranged in left, upper, front three directions of cuboid test piece, and the end of contact with cuboid test piece is equipped with fracturing groove and sensor groove, the top of the fracturing groove is equipped with slide rail, for connecting fracturing module;The fracturing module includes drill rod, cable chamber and high-pressure water chamber are equipped in drill rod interior, cable chamber is used to lay laser cable and electric pulse cable;The laser cable is respectively connected with the laser probe of drill rod outer wall and external laser generator;Electric pulse cable is respectively connected with the electric pulse probe of drill rod outer wall and external discharge capacitor, and the electric pulse probe is respectively provided with positive electrode and negative electrode level.The application can be carried out under indoor conditions, simple, reliable, safe, can be realized to test piece carries out fracturing test of different position, different parameters.

Description

Technical Field

[0001] The present invention belongs to the technical field of coal safety, and in particular relates to a high-energy light-electricity-force combined fracturing and permeability enhancement test device and a method for using the same. Background Art

[0002] Coal and gas outburst is a complex mine gas dynamic phenomenon in coal mining production. It is manifested as a sudden release of a large amount of coal and gas into the tunnel or stope within a certain period of time. This phenomenon can cause the coal body to spew out a large amount of gas and coal rock into the tunnel or stope in a short period of time, forming holes of special shapes, accompanied by dynamic effects such as overturning mine cars and destroying supports. The coal powder-gas flow sometimes has the characteristics of a storm, and the gas flows against the wind and can fill tunnels that are thousands of meters long. In order to solve coal mine gas disasters such as coal and gas outburst, gas extraction has become a key measure. An effective way to improve the effectiveness of gas extraction is to fractur e and increase the permeability of coal seams. Scholars have proposed a variety of technologies, including hydraulic fracturing, carbon dioxide phase change fracturing, microwave permeability enhancement, etc.

[0003] While a variety of coal seam fracturing and permeability enhancement technologies exist, the permeability of coal seams in my country's coal mines is extremely low, with significant variations between different mine areas. This results in the lack of universal applicability of traditional single fracturing methods, and their effectiveness in enhancing permeability is limited. These methods often fail to adapt to the specific conditions of different mining areas and, in practical application, suffer from unsatisfactory results. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention proposes a high-energy light-electricity-force combined fracturing and transmittance enhancement test device and a method of using the same to solve the problems existing in the above-mentioned prior art.

[0005] To achieve the above objectives, in a first aspect, the present invention provides a high-energy light-electricity-force combined fracturing and transmittance enhancement test device, comprising:

[0006] The rectangular specimen is a coal rock sample;

[0007] Multiple loading plates are respectively arranged on the left, top and front sides of the rectangular specimen, and a fracturing groove and a sensor groove are provided on the end in contact with the rectangular specimen. A slide rail is installed on the top of the fracturing groove for connecting the fracturing module;

[0008] The fracturing module includes a drill pipe, and a cable chamber and a high-pressure water chamber are provided inside the drill pipe. The cable chamber is used to lay laser cables and electric pulse cables;

[0009] The laser cables are respectively connected to the laser probe on the outer wall of the drill pipe and the external laser generator;

[0010] The electric pulse cables are respectively connected to the electric pulse probe on the outer wall of the drill pipe and the external discharge capacitor, and the electric pulse probe is respectively provided with a positive electrode and a negative electrode.

[0011] Preferably, each of the plurality of loading platens is connected with a dynamic and static loading oil cylinder.

[0012] Preferably, an acoustic emission sensor is installed in the sensor groove, and the acoustic emission sensor is connected with an acoustic emission acquisition instrument.

[0013] Preferably, the fracturing module is capable of left-right translation and rotation on the slide rail.

[0014] Preferably, the high-pressure water chamber is connected with a water pressure valve and a high-pressure plunger pump.

[0015] In a second aspect, the present application further provides a use method of the high-energy light-electricity-force combined fracturing and permeability improvement test device, comprising the following steps:

[0016] Cut and polish the coal rock sample into a cuboid test piece;

[0017] Apply a predetermined dynamic and static three-directional stress to the cuboid test piece, and use the fracturing module to perform laser irradiation on the surface of the cuboid test piece to form a perforation;

[0018] According to the perforation, inject water through the high-pressure water chamber, use an electric pulse probe to perform electric pulse discharge, and obtain an electric pulse induced cracking result;

[0019] According to the electric pulse induced cracking result, perform hydraulic fracturing on the perforation, and obtain a hydraulic fracturing result;

[0020] According to the hydraulic fracturing result, analyze crack propagation, temperature field evolution, acoustic emission signal positioning, and broken particle size distribution, and comprehensively optimize the parameter combination of laser, electric pulse, and water pressure.

[0021] Preferably, the use method further comprises: installing a plurality of acoustic emission sensors in the sensor groove close to different positions on the surface of the cuboid test piece, and installing a high-speed camera and an infrared camera on the front and rear sides of the cuboid test piece, respectively.

[0022] In a third aspect, the present application further discloses a computer readable storage medium, which has a computer program stored thereon, and the computer program is executed by a processor to realize the steps of the method in the second aspect.

[0023] In a fourth aspect, the present application further discloses a computer program product comprising a computer program, and the computer program is executed by a processor to realize the steps of the method in the second aspect.

[0024] Compared with the prior art, the present application has the following advantages and technical effects:

[0025] The application provides a high-energy photo-electric-power combined fracturing permeability improvement test device, which comprises: a cuboid test piece, which is a coal rock sample; loading pressure plates, which are arranged in the left, upper and front three directions of the cuboid test piece respectively, and are provided with a fracturing groove and a sensor groove at the end in contact with the cuboid test piece, a sliding rail is arranged on the top of the fracturing groove, and is used for connecting a fracturing module; the fracturing module comprises a drill rod, a cable chamber and a high-pressure water chamber are arranged in the drill rod, the cable chamber is used for laying a laser cable and an electric pulse cable; the laser cable is connected with a laser probe on the outer wall of the drill rod and an external laser generator; the electric pulse cable is connected with an electric pulse probe on the outer wall of the drill rod and an external discharge capacitor, and the electric pulse probe is provided with a positive electrode and a negative electrode.

[0026] The application fully utilizes the respective advantages of the laser, the electric pulse and the water pressure, such as large laser energy density, good positioning effect, small electric pulse energy attenuation, good local crushing effect, wide water pressure fracturing application range and large fracturing range, and the fracturing test can be carried out in an indoor condition, and the operation is simple, reliable and safe. Meanwhile, the fracturing module integrating the laser, the electric pulse and the water pressure is designed, and the sliding rail is matched, so that the fracturing test of different positions and different parameters can be realized, the whole test process can be observed, the fracturing permeability improvement effect can be evaluated, and the fracturing parameters can be optimized. BRIEF DESCRIPTION OF DRAWINGS

[0027] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application and are incorporated herein in their entirety. The application illustratively described herein suitably can be practiced in the absence of any element or step not specifically disclosed. In the accompanying drawings:

[0028] Figure 1 FIG. 1 is a schematic diagram of a fracturing permeability improvement test device according to the application, wherein (a) is a front view, and (b) is a right view;

[0029] Figure 2 FIG. 2 is a schematic diagram of a fracturing module and its matching equipment according to the application;

[0030] Wherein, 1, cuboid test piece; 2, first loading pressure plate; 3a, second loading pressure plate, 3b, third loading pressure plate, 3c, fourth loading pressure plate; 4, dynamic and static loading oil cylinder; 5, fracturing groove; 6a, first sensor groove; 6b, second sensor groove; 7, slide rail; 8, fracturing module; 9, acoustic emission sensor; 10, acoustic emission acquisition instrument; 11, drill pipe; 12, cable chamber; 13, high-pressure water chamber; 14, laser cable; 15, electric pulse cable; 16, laser probe; 17, laser generator; 18, electric pulse probe; 19, discharge capacitor; 20, water pressure valve; 21, high-pressure plunger pump; 22a, positive electrode of electric pulse probe; 22b, negative electrode of electric pulse probe; 23a, first laser perforation; 23b, second laser perforation; 23c, third laser perforation; 24a, fifth loading pressure plate; 24b, sixth loading pressure plate; 24c, seventh loading pressure plate. DETAILED DESCRIPTION

[0031] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0032] It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a group of computer executable instructions, and although the logical order is shown in the flowchart, in some cases, the steps shown or described herein can be executed in a different order.

[0033] Embodiment one

[0034] As shown in the figure, the present embodiment provides a high-energy light-electric-power combined fracturing and anti-reflection test device, which comprises: Figure 1 The cuboid test piece 1 is provided with a first loading pressure plate 2, a second loading pressure plate 3a, a third loading pressure plate 3b, a fourth loading pressure plate 3c, a fifth loading pressure plate 24a, a sixth loading pressure plate 24b, and a seventh loading pressure plate 24c in the left, upper, and front directions respectively, and a total of 7 loading pressure plates are provided.

[0035] Specifically, the coal rock samples collected on site in the coal mine are transported back to the laboratory, cut and polished into cuboid test pieces 1.

[0036] The 7 loading pressure plates can be independently or group-controlled, can realize true triaxial partition dynamic and static combined loading, and the loading pressure plates are all made of visual materials, which can be photographed and observed by a high-speed camera and an infrared camera.

[0037]

[0038] ​Three loading plates are arranged above and connected with the dynamic and static loading oil cylinder 4; the upper three loading plates are in contact with the test piece and have a fracture slot 5 and a first sensor slot 6a and a second sensor slot 6b at one end, the fracture slot 5 has a sliding rail 7 installed at the top for connecting a fracture module 8, the first sensor slot 6a and the second sensor slot 6b have two rows of acoustic emission sensors 9 installed therein, and the acoustic emission sensors 9 are connected with an acoustic emission acquisition instrument 10.

[0039] The fracture module 8 comprises a columnar drill rod 11, the drill rod 11 is internally provided with a cable chamber 12 and a high-pressure water chamber 13; the cable chamber 12 is used for laying a laser cable 14 and an electric pulse cable 15, the laser cable 14 is connected with a laser probe 16 on the outer wall of the drill rod 11 and an external laser generator 17, the electric pulse cable 15 is connected with an electric pulse probe 18 on the outer wall of the drill rod 11 and an external discharge capacitor 19; the high-pressure water chamber 13 is connected with a water pressure valve 20 on the outer wall of the drill rod and an external high-pressure plunger pump 21; a schematic diagram of the fracture module and its supporting equipment is shown as Figure 2 .

[0040] The fracture module 8 can be translated left and right and rotated clockwise and counterclockwise on the sliding rail 7; the electric pulse probe 18 has a positive electrode 22a and a negative electrode 22b respectively;

[0041] The embodiment realizes the light-electric-force combined fracturing, sensor installation and signal monitoring at different positions of the cuboid test piece 1 by opening the fracture slot 5 and the first sensor slot 6a and the second sensor slot 6b on the three loading plates above, cooperating with the movable sliding rail 7 and the rotatable fracture module 8, while ensuring that the loading plate 2 is not disturbed.

[0042] Embodiment two

[0043] The embodiment provides a use method of the high-energy light-electric-force combined fracturing anti-reflection test device, which comprises test preparation, laser perforation, electric pulse fracturing, hydraulic fracturing and test analysis, and the specific steps are as follows:

[0044] S1, test preparation;

[0045] 1a) coal rock samples are collected from a coal mine site, transported back to a laboratory, basic parameters of the coal rock samples are tested, a test scheme is formulated, the coal rock samples are cut and polished into cuboid test pieces 1 and installed;

[0046] 1b) multiple acoustic emission sensors 9 are installed in the first sensor slot 6a and the second sensor slot 6b close to different positions of the surface of the cuboid test piece 1, a high-speed camera and an infrared camera are respectively installed on the front and rear sides of the test piece;

[0047] 1c) respectively connect the laser generator 17, the discharge capacitor 19, the high-pressure plunger pump 21 with the fracturing module 8, and then install the fracturing module 8 on the right side of the slide rail 7;

[0048] S2, laser perforation;

[0049] 2a) start the dynamic and static loading oil cylinder 4 to apply a predetermined dynamic and static three-dimensional stress to the cuboid sample 1;

[0050] 2b) rotate the fracturing module 8 until the laser probe 16 is vertically downward to the surface of the cuboid sample 1, push the fracturing module 8 along the slide rail 7 from right to left, and stop pushing at the predetermined perforation position;

[0051] 2c) turn on the laser generator 17, irradiate the surface of the cuboid sample 1 according to the set frequency and time, form a perforation, and then turn off the laser generator 17;

[0052] 2d) repeat step 2c to sequentially complete a plurality of predetermined perforations, and exit the fracturing module along the slide rail to the right; the plurality of perforations include: a first laser perforation 23a, a second laser perforation 23b, and a third laser perforation 23c.

[0053] S3, electric pulse fracturing;

[0054] 3a) rotate the fracturing module 8 until the water pressure valve 20 is perpendicular to the surface of the cuboid sample 1, push the fracturing module 8 along the slide rail 7 from right to left, and stop pushing at the first perforation position;

[0055] 3b) open the water pressure valve 20, fill the first perforation with water, and then close the water pressure valve 20; sequentially push to the left to fill all the perforations with water, and then exit the fracturing module 8 along the slide rail 7 to the right;

[0056] 3c) rotate the fracturing module 8 until the electric pulse probe 18 is perpendicular to the surface of the cuboid sample 1, push the fracturing module 8 along the slide rail 7 from right to left, stop pushing at the first perforation position, and place the positive and negative electrodes on the electric pulse probe 18 in the perforation water, open the discharge capacitor 19, and perform electric pulse discharge according to the predetermined discharge voltage, frequency, and discharge times, and then close the discharge capacitor 19;

[0057] 3d) repeat step 3c to sequentially complete electric pulse fracturing in a plurality of perforations, and exit the fracturing module along the slide rail to the right;

[0058] S4, hydraulic fracturing;

[0059] 4a) rotate the fracturing module 8 until the water pressure valve 20 is perpendicular to the surface of the cuboid sample 1, push the fracturing module 8 along the slide rail 7 from right to left, and stop pushing at the first perforation position;

[0060] 4b) opening the water pressure valve 20, hydraulic fracturing the first perforation according to the predetermined fracturing water pressure and loading rate, and closing the water pressure valve 20 after the end;

[0061] 4c) repeating step 4b to complete hydraulic fracturing in the multiple perforations in turn, and withdrawing the fracturing module to the right along the slide rail;

[0062] S5, test analysis:

[0063] 5a) after the end of the test, analyzing the dynamic expansion law of the fracturing crack of the cuboid test piece 1 by the high-speed camera, and analyzing the surface temperature field evolution law of the test piece in the fracturing process by the infrared camera;

[0064] 5b) positioning the fracturing position by the acoustic emission signal, and analyzing the acoustic emission signal evolution law in different stages of fracturing;

[0065] 5c) analyzing the test piece broken particle size distribution law by collecting and screening the broken test piece samples after fracturing;

[0066] 5d) comprehensively comparing the test piece fracturing and permeability improvement effect under different test conditions, and analyzing to obtain the optimal parameter combination of laser, electric pulse and water pressure.

[0067] Example three

[0068] The embodiment also discloses a computer readable storage medium, and a computer program is stored on the computer readable storage medium, and the computer program is executed by a processor to realize the steps of the method in the embodiment two.

[0069] Example four

[0070] The embodiment also discloses a computer program product, and the computer program product comprises a computer program, and the computer program is executed by a processor to realize the steps of the method in the embodiment two.

[0071] The above is only a preferred specific embodiment of the application, but the protection scope of the application is not limited to this, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the application, which should be covered in the protection scope of the application. Therefore, the protection scope of the application should be subject to the protection scope of the claims.

Claims

1. A high-energy light-electricity-force combined fracturing and transmittance-enhancing test device, characterized in that: include: The rectangular specimen (1) is a coal rock sample; A plurality of loading plates are respectively arranged in the left, upper and front directions of the rectangular parallelepiped specimen (1), and a fracturing groove (5), a first sensor groove (6a), and a second sensor groove (6b) are provided at the end in contact with the rectangular parallelepiped specimen (1). A slide rail (7) is installed on the top of the fracturing groove (5) for connecting a fracturing module (8); The fracturing module (8) includes a drill rod (11), wherein a cable chamber (12) and a high-pressure water chamber (13) are provided inside the drill rod (11), and the cable chamber (12) is used for laying a laser cable (14) and an electric pulse cable (15); The laser cable (14) is respectively connected to a laser probe (16) on the outer wall of the drill rod (11) and an external laser generator (17); The electric pulse cable (15) is connected to an electric pulse probe (18) on the outer wall of the drill pipe and an external discharge capacitor (19), and the electric pulse probe (18) is provided with a positive electrode (22a) and a negative electrode (22b). The fracturing module (8) moves horizontally and rotates on the slide rail (7); the rotating fracturing module (8) respectively makes the laser probe (16), the water pressure valve (20), and the electric pulse probe (18) perpendicular to the surface of the rectangular parallelepiped specimen (1), thereby realizing light-electricity-force combined fracturing at different positions of the rectangular parallelepiped specimen (1).

2. The device according to claim 1, characterized in that The multiple loading pressure plates are all connected to dynamic and static loading cylinders (4).

3. The device according to claim 1, characterized in that Acoustic emission sensors (9) are installed in the first sensor slot (6a) and the second sensor slot (6b), and the acoustic emission sensors (9) are connected to an acoustic emission collector (10).

4. The device according to claim 1, characterized in that The high-pressure water chamber (13) is connected to a water pressure valve (20) and a high-pressure plunger pump (21).

5. A method for using the high-energy light-electricity-force combined fracturing and transmittance enhancement test device according to any one of claims 1 to 4, characterized in that: The following steps are involved: Cut and grind the coal rock sample into a rectangular parallelepiped specimen (1); Applying predetermined dynamic and static triaxial stresses to the rectangular parallelepiped specimen (1), and using a fracturing module (8) to perform laser irradiation on the surface of the rectangular parallelepiped specimen (1) to form perforations; According to the perforation, water is injected through the high-pressure water chamber (13), and electric pulse discharge is performed using an electric pulse probe (18) to obtain electric pulse fracturing results; performing hydraulic fracturing on the perforations according to the electric pulse fracturing results to obtain hydraulic fracturing results; According to the hydraulic fracturing results, the parameter combination of laser, electric pulse and water pressure is comprehensively optimized by analyzing the crack propagation, temperature field evolution, acoustic emission signal positioning and crushed particle size distribution.

6. The method of use according to claim 5, characterized in that: The method further comprises: installing a plurality of acoustic emission sensors (9) at different positions of the first sensor slot (6a) and the second sensor slot (6b) close to the surface of the rectangular parallelepiped specimen (1); and installing a high-speed camera and an infrared camera on the front and rear sides of the rectangular parallelepiped specimen (1), respectively.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to claim 5 are implemented.

8. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to claim 5 are implemented.

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