A device and method for regulating the direction of a heat storage seam network based on the principle of acoustic resonance

Abstract

The present invention provides a device and method for regulating the direction of a thermal storage fracture network based on the principle of acoustic wave resonance, which belongs to the field of intelligent production technology of mines. The technical scheme is as follows: it includes a shell, an ultrasonic vibration unit, an acoustic emission signal acquisition unit and an image acquisition unit are arranged in the shell, a detection port is opened on the shell, the detection end of the ultrasonic vibration unit and the acquisition end of the image acquisition unit are arranged close to the detection port, the ultrasonic vibration unit is used to convert an electrical signal into a vibration signal, the acoustic emission signal acquisition unit is used to collect rock formation acoustic emission and energy conversion, and the image acquisition unit is used to collect rock formation change information. The beneficial effect of the present invention is that the present invention generates cracks in advance on the working face by means of acoustic wave resonance, so that the hydraulic fracturing cracks of the injection well will be connected with the cracks generated by the acoustic wave resonance, and the direction of the fracture network in the hydraulic fracturing can be controlled in this way.

Description

Technical Field

[0001] The present invention relates to the technical field of intelligent mine production, and in particular to a device and method for regulating the direction of a heat storage seam network based on the principle of acoustic wave resonance. Background Art

[0002] China has rich reserves of deep hot dry rock geothermal resources. Effective development of hot dry rock geothermal resources will help improve my country's energy structure and achieve the "dual carbon" goal. How to effectively mine and improve the efficiency of hot dry rock geothermal development and utilization is an engineering and technical problem that urgently needs to be solved.

[0003] Hot dry rock geothermal resources are stored in deep strata. Hard rocks such as dense metamorphic rocks or crystalline rocks and complex deep geological conditions have brought great difficulties to the drilling, storage and long-term exploitation of hot dry rocks. Therefore, with the further development of science and technology, it is still necessary to further study the direction of underground fracture network structure in order to achieve efficient production and long-term stable operation of production wells. The current research is mainly based on laboratory and numerical simulation research. The traditional method is to use water as the working fluid for hydraulic fracturing to generate fracture networks. Nowadays, supercritical carbon dioxide (SC-CO 2 ) and some storage technologies using acidic solutions as working fluids. Compared with traditional working fluids, supercritical carbon dioxide (SC-CO 2 ) can create a large-scale and more dense fracture network, which is conducive to further research on reservoir technology. However, compared with large underground reservoirs, the extension and direction of fractures are difficult to control. In many mines, the injection well working fluid does not circulate sufficiently and flows into the production well, causing economic losses. The direction and scale of the fracture network are the main factors restricting the heat exchange of the reservoir, and the uncertainty and difficulty in predicting the fracture network produced by fracturing hinder the development of geothermal technology.

[0004] In view of the above-mentioned related technologies, the inventors believe that the following problems still exist in the manufacture of geothermal fracture networks under hydraulic fracturing: due to the different structural stress distribution characteristics in different regions, it is difficult to control the direction of the fractures, resulting in poor fracturing effects. Summary of the invention

[0005] The purpose of the present invention is to provide a device and method for regulating the direction of a thermal reservoir fracture network based on the principle of acoustic resonance. By means of acoustic resonance, cracks are generated in advance on the working surface, so that the hydraulic fracturing cracks of the injection well are connected to the cracks generated by the acoustic resonance. In this way, the direction of the fracture network in hydraulic fracturing can be controlled. The changes and directions of rock fractures can be monitored in real time by means of an acoustic emission signal acquisition unit and an image acquisition unit.

[0006] In order to achieve the above-mentioned invention object, the technical solution adopted by the present invention is specifically: a device for regulating the direction of a heat storage fracture network based on the principle of acoustic wave resonance, comprising a shell, wherein an ultrasonic vibration unit, an acoustic emission signal acquisition unit and an image acquisition unit are arranged in the shell, a detection port is opened on the shell, a detection end of the ultrasonic vibration unit and a collection end of the image acquisition unit are arranged close to the detection port, the ultrasonic vibration unit is used to convert an electrical signal into a vibration signal, the acoustic emission signal acquisition unit is used to collect rock formation acoustic emission and energy conversion, and the image acquisition unit is used to collect rock formation change information.

[0007] When the present invention is actually used: determine the working face, install the device on the working face, transmit the acoustic resonance signal to the working face rock through the ultrasonic vibration unit, so that the working face rock near the injection well generates cracks, collect rock acoustic emission and energy changes through the acoustic emission signal acquisition unit, collect the change picture of the working face rock through the image acquisition unit, and the staff determines the acoustic resonance effect by comparing the rock surface changes before and after. After the injection well is continuously hydraulically fractured, the cracks are densely distributed near the injection well and extend to the position with lower stress. Since the rock in the working face area generates cracks due to acoustic resonance, the rock stress in the working face area is lower, and the hydraulic fracture cracks of the injection well will spread toward the working face area, and the cracks around the injection well will be connected with the cracks generated by the acoustic resonance, and then the device will be moved to the next working area until the hydraulic fracturing work is completed. The present invention generates cracks in the working face in advance by means of acoustic resonance, so that the hydraulic fracture cracks of the injection well will be connected with the cracks generated by the acoustic resonance, and the direction regulation of the fracture network in the hydraulic fracturing can be controlled in this way.

[0008] Furthermore, the shell includes an inner sleeve and an outer sleeve, the inner sleeve is fixed inside the outer sleeve, an installation chamber is formed between the inner sleeve and the outer sleeve, the acoustic emission signal acquisition unit and the image acquisition unit are arranged in the installation chamber, and the ultrasonic vibration unit is arranged in the inner sleeve.

[0009] By adopting the above technical solution, since the ultrasonic vibration unit is prone to generate heat when working, the inner sleeve and the outer sleeve can be used to separate the acoustic emission signal acquisition unit, the image acquisition unit and the ultrasonic vibration unit, thereby reducing the interference caused by the temperature rise on the acoustic emission signal acquisition unit and the image acquisition unit.

[0010] Furthermore, the ultrasonic vibration unit includes an electrode sheet, a threaded plug, a prestressed bolt, a piezoelectric ceramic sheet, a cover plate, a variable amplitude rod and a plurality of probe rods, the threaded plug is fixed in the outer sleeve, the prestressed bolt is fixed on the threaded plug, the cover plate, the piezoelectric ceramic sheet and the variable amplitude rod are all connected to the prestressed bolt, the threaded plug, the cover plate, the piezoelectric ceramic sheet and the variable amplitude rod are sequentially abutted, the probe rod is connected to one end of the variable amplitude rod away from the piezoelectric ceramic sheet, the probe rod is arranged close to the detection port, and the detection end of the probe rod is located outside the shell, and the electrode sheet is arranged on the piezoelectric ceramic sheet.

[0011] By adopting the above technical solution, when the ultrasonic vibration unit is working, the electrode sheet and the piezoelectric ceramic sheet convert the electrical signal into a vibration signal, and the vibration signal is transmitted to the probe rod through the amplitude rod, and the probe rod transmits the vibration to the rock on the working surface, so that cracks are generated in the rock. The overall structure of the ultrasonic vibration unit is simple, and the vibration signal transmission method is stable in this way.

[0012] Furthermore, the acoustic emission signal acquisition unit includes a ceramic column, an insulating shell, an amplifier and a terminal, the insulating shell is arranged on the shell, the ceramic column, the amplifier and the terminal are all arranged in the insulating shell, the ceramic column and the amplifier are electrically connected, the amplifier and the terminal are electrically connected, the ceramic column is provided with a coupling surface for receiving the acoustic emission signal, and the terminal is electrically connected to the signal processing device.

[0013] By adopting the above technical solution, the rock changes itself due to the influence of sound wave resonance. The sound wave signal received by the rock is amplified by the amplifier, and the acoustic emission signal is transmitted to the ceramic column through the coupling surface. The ceramic column converts the acoustic emission signal into an electrical signal, which is transmitted to the signal processing device through the terminal for data analysis. Through this structure, the direction of rock cracks can be monitored in real time.

[0014] Furthermore, a cooling unit is provided on the inner sleeve.

[0015] By adopting the above technical solution, the cooling unit can cool the space inside the inner sleeve, and can ensure the normal operation of the ultrasonic vibration unit.

[0016] Furthermore, the cooling unit comprises a cooling pipe, and the cooling pipe is arranged in the inner sleeve.

[0017] By adopting the above technical solution, during the working process, cooling water circulates in the cooling pipe, the structure is simple and the heat exchange method is stable.

[0018] Furthermore, the image acquisition unit includes a plurality of cameras and a plurality of light sources, wherein the cameras and the light sources are arranged in the installation chamber, and the cameras and the light sources are arranged close to the detection port.

[0019] By adopting the above technical solution, the light source cooperates with the camera to make the collected image information clearer, which is convenient for the staff's subsequent analysis work.

[0020] Furthermore, the plurality of cameras are arranged in a circular array, and the plurality of light sources are arranged in a circular array.

[0021] By adopting the above technical solution, this arrangement makes the collection of information more accurate.

[0022] Furthermore, the probe rod is slidably arranged on the amplitude changing rod, a limiting step is fixed on the probe rod, a spring is sleeved on the probe rod, and two ends of the spring are respectively fixedly connected to the limiting step and the amplitude changing rod.

[0023] By adopting the above technical solution, when working, the spring will exert a force on the probe rod, so that the probe rod always remains in close contact with the rock on the working surface. The spring has a stabilizing effect on the probe rod, ensuring that the resonance signal can be stably transmitted to the rock.

[0024] In order to better achieve the above-mentioned invention object, the present invention also provides a method for using a device for regulating the direction of a heat storage seam network based on the principle of acoustic wave resonance, comprising the following steps:

[0025] S1. According to the mining design and actual mining situation of the mining face, the injection well scheme of the working face is designed to determine the layer, depth and fracturing position of the working face.

[0026] S2. Install a device for regulating the direction of the heat storage fracture network based on the principle of acoustic wave resonance on the working face, so that the probe rod contacts the rock of the working face.

[0027] S3. Start the ultrasonic vibration unit and transmit the acoustic resonance signal to the working surface rock through the probe rod, so that cracks are generated in the working surface rock near the injection well.

[0028] S4. The rock on the working face is affected by the acoustic wave resonance and the device itself changes. The acoustic emission and energy changes of the rock are collected by the acoustic emission signal acquisition unit, and the signal is transmitted to the signal processing device through the terminal.

[0029] S5. The image acquisition unit is used to collect pictures of rock changes on the working surface. The staff determines the acoustic resonance effect by comparing the rock surface changes before and after.

[0030] S6. After continuous hydraulic fracturing of the injection well, cracks are densely distributed near the injection well and extend to locations with lower stress. The cracks around the injection well will be connected with the cracks generated by acoustic resonance.

[0031] S7. The acoustic emission signal acquisition unit and the image acquisition unit collect and transmit signals, and compare the differences between the acoustic emission signals before and after and the changes in the rock surface to determine the effects of fracture network regulation and monitoring.

[0032] S8. Repeat S1 to S7 until the hydraulic fracturing is completed.

[0033] By adopting the above technical solution, cracks are generated in advance on the working surface by means of acoustic resonance, so that the hydraulic fracturing cracks of the injection well are connected to the cracks generated by the acoustic resonance, and the direction of the fracture network in the hydraulic fracturing can be controlled in this way. The changes and directions of the rock cracks can be monitored in real time by the acoustic emission signal acquisition unit and the image acquisition unit.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] 1. The present invention generates cracks in the working face in advance by means of acoustic resonance, so that the rock strength at the working face becomes lower. After the injection well is continuously hydraulically fractured, the cracks are densely distributed near the injection well and extend to the position with lower stress. Therefore, the hydraulic fracture cracks of the injection well will spread toward the working face area. In this way, the direction of the fracture network in the hydraulic fracture can be controlled.

[0036] 2. The present invention sets an acoustic emission signal acquisition unit and an image acquisition unit. The image acquisition unit collects the change picture of the rock on the working face. The staff determines the acoustic wave resonance effect by comparing the rock surface changes before and after, and can monitor the direction of the rock cracks in real time.

[0037] 3. The present invention provides a cooling unit, which can cool the space inside the inner sleeve, reduce the impact caused by the temperature rise of the ultrasonic vibration unit, and ensure the normal operation of the ultrasonic vibration unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0039] Figure 1 The present invention is a schematic structural diagram of a device for regulating the direction of a heat storage seam network based on the principle of acoustic wave resonance according to an embodiment of the present invention.

[0040] Figure 2 The figure is a schematic diagram of the structure of an acoustic emission signal acquisition unit according to an embodiment of the present invention.

[0041] Figure 3 It is a schematic diagram of the seam network control and monitoring structure according to an embodiment of the present invention.

[0042] Figure 4 This is a monitoring change diagram of the rock sample according to an embodiment of the present invention.

[0043] Among them, the figure markings are: 1. shell; 11. inner sleeve; 12. outer sleeve; 2. ultrasonic vibration unit; 21. electrode sheet; 22. threaded plug; 23. prestressed bolt; 24. piezoelectric ceramic sheet; 25. cover plate; 26. amplitude transformer; 27. probe rod; 3. acoustic emission signal acquisition unit; 31. ceramic column; 311. coupling surface; 32. insulating shell; 33. amplifier; 34. terminal; 4. image acquisition unit; 41. camera; 42. light source; 5. detection port; 6. installation chamber; 7. cooling unit; 71. cooling tube; 8. limit step; 9. spring. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. Of course, the specific embodiments described here are only used to explain the present invention and are not used to limit the present invention.

[0045] Example:

[0046] See also Figure 1 The present invention provides a technical solution, which is a device for regulating the direction of a thermal reservoir fracture network based on the principle of acoustic wave resonance, comprising a columnar shell 1, in which an ultrasonic vibration unit 2, an acoustic emission signal acquisition unit 3 and an image acquisition unit 4 are arranged, and a detection port 5 is formed at one end of the shell 1, and the detection end of the ultrasonic vibration unit 2 and the collection end of the image acquisition unit 4 are arranged close to the detection port 5. The ultrasonic vibration unit 2 is used to generate and transmit vibration, the acoustic emission signal acquisition unit 3 is used to collect rock formation acoustic emission and energy conversion, and the image acquisition unit 4 is used to collect rock formation change information.

[0047] When working, according to the mining design and actual mining situation of the working face of the mine, the injection well scheme of the working face is designed, the layer, depth and fracturing position of the working face are determined, and the working face is determined according to the preset fracturing position. The device is installed at the working face, and the acoustic resonance signal is transmitted to the working face rock through the ultrasonic vibration unit 2, so that cracks are generated in the working face rock near the injection well, and the rock acoustic emission and energy changes are collected by the acoustic emission signal acquisition unit 3, and the change pictures of the working face rock are collected by the image acquisition unit 4. The staff determines the acoustic resonance effect by comparing the rock surface changes before and after. After the injection well is continuously hydraulically fractured, the cracks are densely distributed near the injection well and extend to the position with lower stress. Since the rock in the working face area has cracks due to acoustic resonance, the rock stress in the working face area is lower, and the hydraulic fracture cracks of the injection well will spread toward the working face area, and the cracks around the injection well will be connected with the cracks generated by the acoustic resonance, and then the device will be moved to the next working area until the hydraulic fracturing work is completed. The present invention generates cracks in the working face in advance by means of acoustic wave resonance, so that the hydraulic fracturing cracks of the injection well are connected with the cracks generated by the acoustic wave resonance. In this way, the direction of the fracture network in the hydraulic fracturing can be controlled.

[0048] Specifically, the housing 1 includes an inner sleeve 11 and an outer sleeve 12 which are coaxially arranged. The inner sleeve 11 is fixed in the outer sleeve 12. An installation chamber 6 is formed between the inner sleeve 11 and the outer sleeve 12. The acoustic emission signal acquisition unit 3 and the image acquisition unit 4 are arranged in the installation chamber 6, and the ultrasonic vibration unit 2 is arranged in the inner sleeve 11. Since the ultrasonic vibration unit 2 is easy to generate heat when working, the inner sleeve 11 and the outer sleeve 12 can realize the separation of the acoustic emission signal acquisition unit 3, the image acquisition unit 4 and the ultrasonic vibration unit 2, which can reduce the interference of the emission signal acquisition unit and the image acquisition unit 4 caused by the temperature rise. In addition, a cooling unit 7 is arranged in the inner sleeve 11. In this embodiment, the cooling unit 7 is a cooling pipe 71, which is embedded in the inner sleeve 11. The outer wall and the inner wall of the cooling pipe 71 are hollow structures, which are convenient for passing cooling water. During the working process, cooling water circulates in the cooling pipe 71. This structure is simple and the heat exchange method is stable.

[0049] The ultrasonic vibration unit 2 includes an electrode sheet 21, a threaded plug 22, a prestressed bolt 23, a piezoelectric ceramic sheet 24, a cover plate 25, an amplitude transformer 26 and four probes 27. The threaded plug 22 is fixed in the outer sleeve 12, the prestressed bolt 23 is fixed on the threaded plug 22 by screwing, the cover plate 25 is sleeved on the prestressed bolt 23, and the cover plate 25 and the threaded plug 22 are abutted on the side close to the detection port 5. The piezoelectric ceramic sheet 24 is sleeved on the prestressed bolt 23, the piezoelectric ceramic sheet 24 and the cover plate 25 are abutted on the side close to the detection port 5, and the electrode sheet 21 is fixed on the piezoelectric ceramic sheet 24. The amplitude transformer 26 is threadedly connected to one end of the prestressed bolt 23 close to the detection port 5, and the piezoelectric ceramic sheet 24 and the piezoelectric ceramic sheet 24 are abutted on one end close to the detection port 5. Four circular holes are opened at one end of the amplitude converter 26 close to the detection port 5, the axes of the four circular holes are parallel to the axis of the amplitude converter 26, and the four circular holes are arranged in a circular array, and four probe rods 27 are respectively inserted into the four circular holes of the amplitude converter 26, and a limiting step 8 is integrally connected to the probe rod 27. A spring 9 is sleeved on the probe rod 27, and both ends of the spring 9 are fixedly connected to the limiting step 8 and the amplitude converter 26 by welding, and the detection end of the probe rod 27 is located outside the shell 1.

[0050] When the ultrasonic vibration unit 2 is working, the electrode sheet 21 and the piezoelectric ceramic sheet 24 convert the electrical signal into a vibration signal, and the vibration signal is transmitted to the probe rod 27 through the amplitude rod 26. The probe rod 27 transmits the vibration to the rock on the working surface, so that cracks are generated in the rock. The overall structure of the ultrasonic vibration unit 2 is simple, and the vibration signal transmission method is stable in this way. In addition, when working, the spring 9 will apply a force to the probe rod 27, so that the probe rod 27 always keeps a close contact with the rock on the working surface. The spring 9 has a stabilizing effect on the probe rod 27, ensuring that the resonance signal can be stably transmitted to the rock.

[0051] Reference Figure 1 and Figure 2 The acoustic emission signal acquisition unit 3 includes a ceramic column 31, an insulating shell 32, an amplifier 33 and a terminal 34. The insulating shell 32 is installed on the outer sleeve. The ceramic column 31, the amplifier 33 and the terminal 34 are all arranged in the insulating shell 32. The ceramic column 31 is electrically connected to the amplifier 33, and the amplifier 33 is electrically connected to the terminal 34. The ceramic column 31 is provided with a coupling surface 311 for receiving the acoustic emission signal, and the terminal 34 is electrically connected to the signal processing device. When working, the rock changes itself due to the resonance of the sound wave. The sound wave signal received by the rock is amplified by the amplifier 33, and the acoustic emission signal is transmitted to the ceramic column 31 through the coupling surface 311. The ceramic column 31 converts the acoustic emission signal into an electrical signal, and transmits it to the signal processing device through the terminal 34 for data analysis. Through this structure, the direction of the rock crack can be monitored in real time.

[0052] Reference Figure 1The image acquisition unit 4 includes a plurality of cameras 41 and a plurality of light sources 42. The cameras 41 and the light sources 42 are arranged in the installation chamber 6, and the cameras 41 and the light sources 42 are arranged near the detection port 5. The plurality of cameras 41 are arranged in a circular array, and the plurality of light sources 42 are arranged in a circular array. The cameras 41 are electrically connected to the signal processing device, and the light sources 42 cooperate with the cameras 41 to make the collected image information clearer. The collected image information is transmitted to the signal processing device to facilitate the subsequent analysis work of the staff. In the present embodiment, two cameras 41 and two light sources 42 are each provided. It should be noted that the number of cameras 41 and light sources 42 can be increased according to specific needs.

[0053] It should be noted that, in this embodiment, the signal processing device is a computer, and the staff can remotely process the received information through the computer.

[0054] The implementation principle of the device for regulating the direction of the thermal reservoir fracture network based on the principle of acoustic resonance in the embodiment of the present invention is as follows: when working, according to the mining design and actual mining situation of the mining face, the injection well scheme of the working face is designed, the layer, depth and fracturing position of the working face are determined, and the working face is determined according to the preset fracturing position. The device is installed at the working face, and the acoustic resonance signal is transmitted to the working face rock through the ultrasonic vibration unit 2, so that cracks are generated in the working face rock near the injection well, and the rock acoustic emission and energy changes are collected by the acoustic emission signal acquisition unit 3, and the change picture of the working face rock is collected by the image acquisition unit 4. The staff determines the acoustic resonance effect by comparing the rock surface changes before and after. After the injection well is continuously hydraulically fractured, the cracks are densely distributed near the injection well and extend to the position with lower stress. Since the rock in the working face area has cracks due to acoustic resonance, the rock stress in the working face area is lower, and the hydraulic fracture cracks of the injection well will spread toward the working face area, and the cracks around the injection well will be connected with the cracks generated by the acoustic resonance, and then the device will be moved to the next working area until the hydraulic fracturing work is completed. The present invention generates cracks in the working face in advance by means of acoustic wave resonance, so that the hydraulic fracturing cracks of the injection well are connected with the cracks generated by the acoustic wave resonance. In this way, the direction of the fracture network in the hydraulic fracturing can be controlled.

[0055] Reference Figures 1 to 4 In order to better achieve the above-mentioned invention object, the present invention also provides a method for using a device for regulating the direction of a heat storage seam network based on the principle of acoustic resonance, comprising the following steps:

[0056] S1. According to the mining design and actual mining situation of the mining face, the injection well scheme of the working face is designed to determine the layer, depth and fracturing position of the working face.

[0057] S2. Install a device for regulating the direction of the heat storage fracture network based on the principle of acoustic resonance on the working face, so that the probe rod 27 is in contact with the rock of the working face.

[0058] S3, start the ultrasonic vibration unit 2, and transmit the acoustic resonance signal to the working surface rock through the probe rod 27, so that cracks are generated in the working surface rock near the injection well.

[0059] S4. The rock on the working face is affected by the acoustic resonance and the device itself changes. The acoustic emission and energy changes of the rock are collected by the acoustic emission signal acquisition unit 3, and the signal is transmitted to the signal processing device through the terminal 34. The signal processing device draws a graph of the received signal and can monitor the effect of the acoustic resonance on the rock in real time.

[0060] S5. The image acquisition unit 4 is used to collect images of rock changes on the working surface. The collected images are transmitted to the signal processing device. The staff determines the acoustic resonance effect by comparing the rock surface changes before and after.

[0061] S6. After continuous hydraulic fracturing of the injection well, cracks are densely distributed near the injection well and extend to locations with lower stress. The cracks around the injection well will be connected with the cracks generated by acoustic resonance.

[0062] S7, the acoustic emission signal acquisition unit 3 and the image acquisition unit 4 collect and transmit signals, and compare the difference between the acoustic emission signals before and after and the changes in the rock surface to determine the effect of the fracture network regulation and monitoring.

[0063] S8. Repeat S1 to S7 until the hydraulic fracturing is completed.

[0064] By adopting the above technical solution, cracks are generated in advance on the working surface by means of acoustic resonance, so that the hydraulic fracturing cracks of the injection well are connected to the cracks generated by the acoustic resonance, and the direction of the fracture network in the hydraulic fracturing can be controlled in this way. The changes and directions of the rock cracks can be monitored in real time by the acoustic emission signal acquisition unit 3 and the image acquisition unit 4.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for regulating the direction of a heat storage seam network based on the principle of acoustic resonance, characterized in that: The invention comprises a shell (1), wherein an ultrasonic vibration unit (2), an acoustic emission signal acquisition unit (3) and an image acquisition unit (4) are arranged in the shell (1), a detection port (5) is opened on the shell (1), a detection end of the ultrasonic vibration unit (2) and a collection end of the image acquisition unit (4) are arranged close to the detection port (5), the ultrasonic vibration unit (2) is used to convert an electrical signal into a vibration signal, the acoustic emission signal acquisition unit (3) is used to collect rock formation acoustic emission and energy conversion information, and the image acquisition unit (4) is used to collect rock formation change information; The shell (1) comprises an inner sleeve (11) and an outer sleeve (12); the inner sleeve (11) is fixed inside the outer sleeve (12); an installation chamber (6) is formed between the inner sleeve (11) and the outer sleeve (12); the acoustic emission signal acquisition unit (3) and the image acquisition unit (4) are arranged in the installation chamber (6); and the ultrasonic vibration unit (2) is arranged in the inner sleeve (11); The ultrasonic vibration unit (2) comprises an electrode sheet (21), a threaded plug (22), a prestressed bolt (23), a piezoelectric ceramic sheet (24), a cover plate (25), a horn (26) and a plurality of probes (27); the threaded plug (22) is fixed in the outer sleeve (12); the prestressed bolt (23) is fixed on the threaded plug (22); the cover plate (25), the piezoelectric ceramic sheet (24), the horn (26) and the prestressed bolt are (23), the threaded plug (22), the cover plate (25), the piezoelectric ceramic sheet (24), and the amplitude change rod (26) are arranged in abutment with each other in sequence, the probe rod (27) is connected to one end of the amplitude change rod (26) away from the piezoelectric ceramic sheet (24), the probe rod (27) is arranged close to the detection port (5), and the detection end of the probe rod (27) is located outside the shell (1), and the electrode sheet (21) is arranged on the piezoelectric ceramic sheet (24).

2. The device for regulating the direction of a heat storage seam network based on the principle of acoustic resonance according to claim 1, characterized in that: The acoustic emission signal acquisition unit (3) comprises a ceramic column (31), an insulating shell (32), an amplifier (33) and a terminal (34); the insulating shell (32) is arranged on the housing (1); the ceramic column (31), the amplifier (33) and the terminal (34) are all arranged in the insulating shell (32); the ceramic column (31) and the amplifier (33) are electrically connected; the amplifier (33) and the terminal (34) are electrically connected; a coupling surface (311) for receiving an acoustic emission signal is provided on the ceramic column (31); and the terminal (34) and a signal processing device are electrically connected.

3. The device for regulating the direction of a heat storage seam network based on the principle of acoustic resonance according to claim 1, characterized in that: The inner sleeve (11) is provided with a cooling unit (7).

4. The device for regulating the direction of a heat storage seam network based on the principle of acoustic resonance according to claim 3 is characterized in that: The cooling unit (7) comprises a cooling pipe (71), and the cooling pipe (71) is arranged in the inner sleeve (11).

5. The device for regulating the direction of a heat storage seam network based on the principle of acoustic resonance according to claim 1, characterized in that: The image acquisition unit (4) comprises a plurality of cameras (41) and a plurality of light sources (42); the cameras (41) and the light sources (42) are arranged in the installation chamber (6); and the cameras (41) and the light sources (42) are arranged close to the detection port (5).

6. The device for regulating the direction of a heat storage seam network based on the principle of acoustic resonance according to claim 5, characterized in that: The plurality of cameras (41) are arranged in a circular array, and the plurality of light sources (42) are arranged in a circular array.

7. The device for regulating the direction of a heat storage seam network based on the principle of acoustic resonance according to claim 1, characterized in that: The probe rod (27) is slidably arranged on the amplitude changing rod (26), a limit step (8) is fixed on the probe rod (27), a spring (9) is sleeved on the probe rod (27), and two ends of the spring (9) are respectively fixedly connected to the limit step (8) and the amplitude changing rod (26).

8. A method for using a device for regulating the direction of a heat storage seam network based on the principle of acoustic resonance, characterized in that: The following steps are involved: S1. According to the mining design and actual mining situation of the mining face, design the injection well scheme of the working face, and determine the layer, depth and fracturing position of the working face; S2, installing a device for regulating the direction of the heat storage fracture network based on the principle of acoustic resonance on the working face, so that the probe rod (27) is in contact with the rock of the working face; S3, starting the ultrasonic vibration unit (2), transmitting the acoustic resonance signal to the working surface rock through the probe rod (27), so that cracks are generated in the working surface rock near the injection well; S4, the rock on the working face is affected by the acoustic resonance and the device itself changes, and the acoustic emission and energy change information of the rock is collected through the acoustic emission signal collection unit (3), and the signal is transmitted to the signal processing device through the terminal (34); S5. The image acquisition unit (4) collects images of rock changes on the working surface, and the staff determines the acoustic resonance effect by comparing the rock surface changes before and after; S6. After the injection well is continuously hydraulically fractured, the cracks are densely distributed near the injection well and extend to the location with lower stress. The cracks around the injection well will be connected with the cracks generated by the acoustic resonance. S7, the acoustic emission signal collection unit (3) and the image collection unit (4) collect and transmit signals, and compare the difference between the acoustic emission signals before and after and the changes in the rock surface to determine the effect of fracture network regulation and monitoring; S8. Repeat S1 to S7 until the hydraulic fracturing is completed.

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