Drilling fracture monitoring device for coal gas extraction drilling simulation system
By combining acoustic emission monitors, nuclear magnetic resonance meters and infrared cameras, the problem of only rough crack areas in the prior art is solved, and the precise monitoring of the inner wall and peri-hole cracks of coal gas extraction drilling holes is achieved, thereby improving the purity of gas extraction.
Patent Information
- Application Number
- CN202421835374.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-31
- Publication Date
- 2025-07-08
- Estimated Expiration
- 2034-07-31
AI Technical Summary
The existing crack monitoring device can only determine the approximate area of the cracks in the coal gas extraction drilling holes, and cannot accurately determine the crack characteristics and expansion of the hole inner wall and periphery of the hole.
The acoustic emission monitor, nuclear magnetic resonance instrument and infrared camera are combined to determine the approximate area through the acoustic emission monitor, the nuclear magnetic resonance instrument determines the fracture parameters of the inner wall of the hole, and the infrared camera determines the fracture image of the peri-hole.
Accurate monitoring of the inner wall and peri-hole cracks of the coal-body gas extraction drilling holes is achieved, avoiding the decrease in concentration caused by mixing air and gas, and improving the purity of gas extraction.
Smart Images
Figure CN223078220U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of coal mine gas drainage, and particularly relates to a borehole fracture monitoring device for a coal body gas drainage borehole simulation system. Background Technique
[0002] Gas is a precious energy source and also an air pollutant. In deep underground coal seams, as the gas pressure increases, the gas concentration, that is, the gas content, also increases. To avoid the high gas concentration affecting the safety of coal miners, gas drainage boreholes can be drilled in deep coal seams, and the gas in the deep coal seams can be drained through the gas drainage boreholes, thereby reducing the gas concentration in the deep coal seams and ensuring the safety of coal miners.
[0003] During the gas drainage process, under the combined action of coal seam stress (i.e., the internal force in the coal seam, the main factor), coal seam temperature, and gas pressure, fractures will occur on the inner wall and around the borehole of the gas drainage borehole. Since the return airway and the transportation airway are arranged on both sides of the deep coal seam where the gas drainage borehole is drilled, when there are fractures in the gas drainage borehole, the air in the above-mentioned roadways will enter the gas drainage borehole, resulting in the mixed air in the drained gas, reducing the concentration of the drained gas (i.e., the gas is impure).
[0004] In the prior art, a coal body gas drainage borehole simulation system and a borehole fracture monitoring device are usually set on the ground. The coal body gas drainage borehole simulation system can simulate the real deep coal seam environment. For example, coal seam stress, coal seam temperature, and gas pressure, etc. When the above conditions are the same, the borehole fracture monitoring device (for example, an acoustic emission monitor) is used to monitor the fracture condition of the coal seam gas drainage borehole in the coal body gas drainage borehole simulation system, and determine the fracture area of the coal seam gas drainage borehole, so that technicians can make targeted fracture repair in the real deep coal seam gas drainage borehole area based on the above area, avoiding the situation that the air in the roadway mixes with the gas and reduces the gas drainage concentration.
[0005] However, the existing fracture monitoring devices (for example, acoustic emission monitors) can only determine the approximate area of the fractures in the coal body gas drainage borehole.
[0006] Therefore, there is an urgent need for a borehole fracture monitoring device for a coal body gas drainage borehole simulation system, which can determine the fracture propagation characteristics around the borehole of the coal body gas drainage borehole, as well as the infrared evolution characteristics and fracture propagation conditions on the surface around the borehole. Content of the Utility Model
[0007] To solve the above technical problems, the present utility model provides a borehole fracture monitoring device for a coal body gas drainage borehole simulation system, which can, on the basis of the acoustic emission monitor determining the approximate area of the borehole fracture, superimpose a nuclear magnetic resonance instrument and an infrared camera to determine the hole circumference fracture expansion characteristics of the coal body gas drainage borehole, as well as the infrared evolution characteristics of the hole circumference surface and the fracture expansion situation.
[0008] The present utility model provides a borehole fracture monitoring device for a coal body gas drainage borehole simulation system. The coal body gas drainage borehole simulation system includes: a triaxial stress chamber for placing the coal body of the gas drainage borehole, a coal body stress control system fixedly connected to the triaxial stress chamber on the remaining surfaces except the right side surface of the triaxial stress chamber for controlling the stress of the coal body inside the triaxial stress chamber, a temperature control system fixedly connected to the upper and lower bottom surfaces of the triaxial stress chamber for controlling the temperature inside the triaxial stress chamber, a gas pressure control system fixedly connected to the triaxial stress chamber beside the triaxial stress chamber for controlling the gas pressure inside the triaxial stress chamber, an environmental sensor fixedly connected to the triaxial stress chamber beside the triaxial stress chamber and electrically connected to the triaxial stress chamber for monitoring the coal body stress, the temperature inside the triaxial stress chamber, and the gas pressure inside the triaxial stress chamber, and a first server fixedly connected to the environmental sensor beside the environmental sensor and electrically connected to the environmental sensor for adjusting the coal body stress, the temperature inside the triaxial stress chamber, and the gas pressure inside the triaxial stress chamber to be consistent with the mine coal body environment; and it is characterized in that:
[0009] Beside the triaxial stress chamber, there is an acoustic emission monitor electrically connected to the triaxial stress chamber for determining the fracture area of the coal body gas drainage borehole, a nuclear magnetic resonance instrument electrically connected to the triaxial stress chamber beside the triaxial stress chamber for determining the fractures on the inner wall of the hole of the coal body gas drainage borehole, a visualization window for installing toughened inorganic glass is opened on the right side surface of the triaxial stress chamber, an infrared camera opposite to the visualization window beside the visualization window for obtaining the hole circumference fracture video of the coal body gas drainage borehole, and a second server electrically connected to the infrared camera beside the infrared camera for determining the hole circumference fractures based on the hole circumference fracture video.
[0010] The above-mentioned borehole fracture monitoring device for a coal body gas drainage borehole simulation system is characterized in that: the coal body stress control system includes a plurality of hydraulic cylinders fixedly connected to the triaxial stress chamber for controlling the stress of the coal body inside the triaxial stress chamber.
[0011] The above-mentioned borehole fracture monitoring device for a coal seam gas drainage borehole simulation system is characterized in that: the temperature control system includes a plurality of temperature regulating plates fixedly connected to the triaxial stress chamber for controlling the internal temperature of the triaxial stress chamber.
[0012] The above-mentioned borehole fracture monitoring device for a coal seam gas drainage borehole simulation system is characterized in that: the triaxial stress chamber includes a gas injection port fixedly arranged above the left side surface; the gas pressure control system includes a gas cylinder, the gas cylinder is fixedly connected to a suction and pressure integrated machine that presses gas into the triaxial stress chamber through a pipeline pressure control system, and the suction and pressure integrated machine is fixedly connected to the gas injection port above the left side surface of the triaxial stress chamber through a pipeline gas switch control system; the pipeline pressure control system includes a nickel-based alloy pipeline and a pipeline gas pressure gauge fixedly arranged on the outer surface of the nickel-based alloy pipeline for controlling the internal pressure of the nickel-based alloy pipeline; the pipeline gas switch control system includes the nickel-based alloy pipeline and a gas flow valve fixedly arranged on the outer surface of the nickel-based alloy pipeline for controlling the internal gas pressure of the triaxial stress chamber.
[0013] The beneficial effects are deduced as follows:
[0014] In the prior art, a fracture monitoring device (for example, an acoustic emission monitor) can only determine the approximate area of the fractures in the coal seam gas drainage borehole.
[0015] However, in the technical solution of the present utility model, the fracture parameters of the inner wall of the borehole and the fracture image around the borehole can be determined by an acoustic emission monitor, a nuclear magnetic resonance instrument, and an infrared camera.
[0016] Specifically, first, the approximate area of the borehole fractures can be determined by an acoustic emission monitor; second, the fracture propagation characteristics around the borehole (for example, the fracture parameters of the inner wall of the borehole in the radial direction of the borehole) can be determined by a nuclear magnetic resonance instrument, and the infrared evolution characteristics of the surface around the borehole and the fracture propagation situation (for example, the fracture image around the borehole in the axial direction of the borehole can be determined based on the temperature image of the borehole) can be determined by an infrared camera.
[0017] It is also precisely because two devices, namely a nuclear magnetic resonance instrument and an infrared camera, are added that after determining the approximate area of the borehole fractures, the fracture parameters of the inner wall of the fractures and the fracture image around the borehole can be determined.
[0018] The situation where a fracture monitoring device (for example, an acoustic emission monitor) can only determine the approximate area of the fractures in the coal seam gas drainage borehole is avoided.
[0019] Therefore, by using the borehole fracture monitoring device for a coal seam gas drainage borehole simulation system in the present utility model, the fracture parameters of the inner wall of the borehole and the fracture image around the borehole can be determined. Brief Description of the Drawings
[0020] Figure 1 It is the overall structure diagram of a borehole fracture monitoring device for a borehole gas drainage simulation system provided by the present utility model;
[0021] Figure 2 It is Figure 1 the top view of the triaxial stress chamber;
[0022] Figure 3 It is Figure 1 the left view of the triaxial stress chamber;
[0023] Description of the reference numerals:
[0024] Triaxial stress chamber 1; environmental sensor 2; first server 3;
[0025] Acoustic emission monitor 4; nuclear magnetic resonance instrument 5; toughened inorganic glass 6;
[0026] Visualization window 7; infrared camera 8; second server 9;
[0027] Hydraulic cylinder 10; temperature regulating plate 11; gas injection port 12;
[0028] Gas cylinder 13; suction and pressure integrated machine 14; nickel-based alloy pipe 15;
[0029] Pipeline gas pressure gauge 16; gas flow valve 17; gas exhaust port 18. Detailed Description of the Preferred Embodiment
[0030] The present utility model will be further described in detail below with reference to the embodiments and the drawings. It can be understood that the specific embodiments described herein are only used to explain the relevant utility model, rather than limiting the utility model. In addition, it should be noted that for the sake of description, only the parts related to the utility model are shown in the drawings.
[0031] It should be noted that, without conflict, the embodiments and the features of the embodiments in the present utility model can be combined with each other. The present utility model will be described in detail below with reference to the embodiments and in conjunction with the drawings.
[0032] In the prior art, a fracture monitoring device (for example, an acoustic emission monitor) can only determine the approximate area of the fractures in the borehole gas drainage of the coal body.
[0033] Based on this, the present utility model provides a borehole fracture monitoring device for a borehole gas drainage simulation system of a coal body. The above device can not only determine the fracture propagation characteristics around the borehole of the borehole gas drainage of the coal body, as well as the infrared evolution characteristics and fracture propagation conditions on the surface around the borehole.
[0034] Figure 1 The overall structure diagram of a borehole fracture monitoring device for a coal body gas drainage borehole simulation system provided by the present utility model Figure 2 is Figure 1 the top view of the triaxial stress chamber Figure 3 is Figure 1 the left view of the triaxial stress chamber
[0035] Referring to Figure 1 , the present utility model provides a borehole fracture monitoring device for a coal body gas drainage borehole simulation system. The coal body gas drainage borehole simulation system includes: a triaxial stress chamber 1 for placing the coal body of the gas drainage borehole, a coal body stress control system fixedly connected to the triaxial stress chamber 1 on the remaining surfaces except the right side surface of the triaxial stress chamber 1 for controlling the stress of the coal body inside the triaxial stress chamber 1, a temperature control system fixedly connected to the upper and lower bottom surfaces of the triaxial stress chamber 1 for controlling the temperature inside the triaxial stress chamber 1, a gas pressure control system fixedly connected to the triaxial stress chamber 1 beside the triaxial stress chamber 1 for controlling the gas pressure inside the triaxial stress chamber 1, an environmental sensor 2 fixedly connected to the triaxial stress chamber 1 beside the triaxial stress chamber 1 for monitoring the coal body stress, the temperature inside the triaxial stress chamber 1, and the gas pressure inside the triaxial stress chamber 1, and a first server 3 fixedly connected to the environmental sensor 2 beside the environmental sensor 2 for adjusting the coal body stress, the temperature inside the triaxial stress chamber 1, and the gas pressure inside the triaxial stress chamber 1 to be consistent with the mine coal body environment;
[0036] Beside the triaxial stress chamber 1, there is an acoustic emission monitor 4 electrically connected to the triaxial stress chamber 1 for determining the fracture area of the coal body gas drainage borehole, a nuclear magnetic resonance instrument 5 electrically connected to the triaxial stress chamber 1 beside the triaxial stress chamber 1 for determining the fractures on the inner wall of the borehole of the coal body gas drainage borehole, a visualization window 7 for installing toughened inorganic glass 6 is opened on the right side surface of the triaxial stress chamber 1, an infrared camera 8 fixedly connected to the visualization window 7 beside the visualization window 7 for obtaining the video of the fractures around the borehole of the coal body gas drainage borehole, and a second server 9 electrically connected to the infrared camera 8 beside the infrared camera 8 for determining the fractures around the borehole based on the video of the fractures around the borehole.
[0037] In specific implementation, the coal body gas drainage borehole simulation system (for example, the triaxial stress chamber 1, the coal body stress control system, the temperature control system, and the gas pressure control system) can simulate the actual or real underground deep coal seam gas drainage borehole environment.
[0038] Exemplarily, after the coal body stress control system, the temperature control system, and the gas pressure control system respectively control the stress, temperature, and gas pressure of the coal body inside the triaxial stress chamber 1, the environmental sensor 2 can transmit the monitored above parameters to the first server 3. If the above parameters do not reach the actual underground deep coal seam gas drainage borehole environment, the first server 3 can adjust the above three systems so that the conditions inside the triaxial stress chamber 1 are consistent with the real underground coal seam.
[0039] It should be noted that when the above coal body stress control system (which is the main factor for generating borehole fractures compared with the temperature control system and the gas pressure control system) acts on the coal body gas drainage borehole in the triaxial stress chamber 1, the balanced state of the internal force of the coal body gas drainage borehole will be broken, that is, the internal force of the coal body gas drainage borehole is unbalanced. At this time, fractures will be generated in the coal body gas drainage borehole (for example, borehole inner wall fractures, borehole perimeter fractures).
[0040] Furthermore, the borehole fracture monitoring device (for example, acoustic emission monitor 4, nuclear magnetic resonance instrument 5, and infrared camera 8) can determine the details of the borehole fractures. For example, the approximate fracture area of the borehole can be determined by using the acoustic emission monitor 4, the inner wall fracture parameters of the borehole fractures can be determined by using the nuclear magnetic resonance instrument 5, and the perimeter fracture image of the borehole fractures can be determined by using the infrared camera 8.
[0041] The beneficial effects are deduced as follows:
[0042] In the prior art, the fracture monitoring device (for example, acoustic emission monitor) can only determine the approximate area of the coal body gas drainage borehole fractures.
[0043] In the technical solution of the present utility model, the inner wall fracture parameters and the perimeter fracture image of the borehole fractures can be determined by the acoustic emission monitor, the nuclear magnetic resonance instrument, and the infrared camera.
[0044] Specifically, first, the approximate area of the borehole fractures can be determined by the acoustic emission monitor; second, the expansion characteristics of the borehole perimeter fractures (for example, the inner wall fracture parameters of the borehole along the radial direction) can be determined by the nuclear magnetic resonance instrument, and the infrared evolution characteristics of the borehole perimeter surface and the fracture expansion situation (for example, the perimeter fracture image of the borehole along the axial direction can be determined based on the temperature image of the borehole) can be determined by the infrared camera.
[0045] It is precisely because two devices, namely the nuclear magnetic resonance instrument and the infrared camera, are added that after determining the approximate area of the borehole fractures, the inner wall fracture parameters and the perimeter fracture image of the fractures can be determined.
[0046] It avoids the situation where the crack monitoring device (e.g., acoustic emission monitor) can only determine the approximate area of the cracks in the coal seam gas drainage borehole.
[0047] Therefore, by using the borehole crack monitoring device for the coal seam gas drainage borehole simulation system in the present utility model, the crack parameters on the inner wall of the borehole and the crack image around the borehole can be determined.
[0048] In the foregoing embodiments, a borehole crack monitoring device for a coal seam gas drainage borehole simulation system was introduced. In another embodiment of the present utility model, the specific components of the coal body stress control system are introduced.
[0049] For example, the coal body stress control system includes a plurality of hydraulic cylinders 10 fixedly connected to the triaxial stress chamber 1 for controlling the stress of the coal body inside the triaxial stress chamber 1.
[0050] In specific implementation, the hydraulic cylinders 10 can change the stress of the coal body inside the triaxial stress chamber 1 (i.e., the internal force), causing cracks to occur in the coal seam gas drainage borehole.
[0051] It can be understood that the main factor for the generation of cracks in the borehole is the change in the coal body stress, and the secondary factors are the changes in temperature and gas pressure.
[0052] In the foregoing embodiments, the specific components of the coal body stress control system were introduced. In another embodiment of the present utility model, the specific components of the temperature control system are introduced.
[0053] For example, the temperature control system includes a plurality of temperature regulating plates 11 fixedly connected to the triaxial stress chamber 1 for controlling the temperature inside the triaxial stress chamber 1.
[0054] In specific implementation, the temperature regulating plates 11 can control the temperature inside the triaxial stress chamber.
[0055] In the foregoing embodiments, the specific components of the temperature control system were introduced. In another embodiment of the present utility model, the specific components of the gas pressure control system, and the specific connection components between the gas pressure control system and the triaxial stress chamber 1 are introduced.
[0056] For example, the triaxial stress chamber 1 includes a gas injection port 12 fixedly arranged above the left side surface. The gas pressure control system includes a gas cylinder 13. The gas pressure control system includes a gas cylinder 13. The gas cylinder 13 is fixedly connected to a suction and pressure integrated machine 14 that presses the gas into the triaxial stress chamber 1 through a pipeline pressure control system. The suction and pressure integrated machine 14 is fixedly connected to the gas injection port 12 above the left side surface of the triaxial stress chamber 1 through a pipeline gas switch control system; the pipeline pressure control system includes a nickel-based alloy pipeline 15 and a pipeline gas pressure gauge 16 fixedly arranged on the outer surface of the nickel-based alloy pipeline 15 for controlling the pressure inside the nickel-based alloy pipeline 15;
[0057] The pipeline gas switch control system includes a nickel-based alloy pipeline 15 and a gas flow valve 17 fixedly arranged on the outer surface of the nickel-based alloy pipeline 15 for controlling the gas pressure inside the triaxial stress chamber 1.
[0058] In specific implementation, the purpose of controlling the gas pressure inside the triaxial stress chamber 1 can be achieved by controlling the opening or closing of the gas flow valve 17, and the gas inside the triaxial stress chamber 1 can be discharged through the gas exhaust port 18.
[0059] It should be noted that after the gas is discharged from the gas exhaust port 18, the gas can be collected into a gas recovery bottle to avoid environmental pollution caused by gas emissions.
[0060] The above are only the preferred embodiments of the present invention, and do not impose any limitations on the present invention. Any simple modifications, changes, and equivalent structural changes made to the above embodiments according to the technical essence of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims
1. A borehole fracture monitoring device for a coal seam gas drainage borehole simulation system. The coal seam gas drainage borehole simulation system includes a triaxial stress chamber (1) for placing the coal body of the gas drainage borehole, a coal body stress control system fixedly connected to the triaxial stress chamber (1) on the remaining surfaces except the right side surface of the triaxial stress chamber (1) for controlling the stress of the coal body inside the triaxial stress chamber (1), a temperature control system fixedly connected to the upper and lower bottom surfaces of the triaxial stress chamber (1) for controlling the temperature inside the triaxial stress chamber (1), a gas pressure control system fixedly connected to the side of the triaxial stress chamber (1) for controlling the gas pressure inside the triaxial stress chamber (1), an environmental sensor (2) fixedly connected to the side of the triaxial stress chamber (1) and electrically connected to the triaxial stress chamber (1) for monitoring the coal body stress, the temperature inside the triaxial stress chamber (1), and the gas pressure inside the triaxial stress chamber (1), and a first server (3) fixedly connected to the side of the environmental sensor (2) and electrically connected to the environmental sensor (2) for adjusting the coal body stress, the temperature inside the triaxial stress chamber (1), and the gas pressure inside the triaxial stress chamber (1) to be consistent with the mine coal body environment. It is characterized in that: There is an acoustic emission monitor (4) electrically connected to the triaxial stress chamber (1) and arranged beside the triaxial stress chamber (1) for determining the fracture area of the coal seam gas drainage borehole, a nuclear magnetic resonance instrument (5) electrically connected to the triaxial stress chamber (1) and arranged beside the triaxial stress chamber (1) for determining the fractures on the inner wall of the borehole of the coal seam gas drainage borehole. A visualization window (7) for installing tempered inorganic glass (6) is opened on the right side surface of the triaxial stress chamber (1). An infrared camera (8) is arranged beside the visualization window (7) and facing the visualization window (7) for obtaining the video of the fractures around the borehole of the coal seam gas drainage borehole, and a second server (9) electrically connected to the infrared camera (8) and arranged beside the infrared camera (8) for determining the fractures around the borehole based on the video of the fractures around the borehole.
2. The borehole fracture monitoring device for a coal seam gas drainage borehole simulation system according to claim 1, characterized in that: The coal body stress control system includes a plurality of hydraulic cylinders (10) fixedly connected to the triaxial stress chamber (1) for controlling the stress of the coal body inside the triaxial stress chamber (1).
3. The borehole fracture monitoring device for the coal body gas drainage borehole simulation system according to claim 1, characterized in that: The temperature control system includes a plurality of temperature regulating plates (11) fixedly connected to the triaxial stress chamber (1) for controlling the temperature inside the triaxial stress chamber (1).
4. The borehole fracture monitoring device for a coal seam gas drainage borehole simulation system according to claim 1, characterized in that: The triaxial stress chamber (1) includes a gas injection port (12) fixedly arranged above the left side surface and a gas exhaust port (18) fixedly arranged below the right side surface; The gas pressure control system includes a gas cylinder (13), and the gas cylinder (13) is fixedly connected to a suction and pressure integrated machine (14) that presses gas into the triaxial stress chamber (1) through a pipeline pressure control system. The suction and pressure integrated machine (14) is fixedly connected to a gas injection port (12) above the left side surface of the triaxial stress chamber (1) through a pipeline gas switch control system; The pipeline pressure control system includes a nickel-based alloy pipeline (15) and a pipeline gas pressure gauge (16) fixedly arranged on the outer surface of the nickel-based alloy pipeline (15) for controlling the internal pressure of the nickel-based alloy pipeline (15); The pipeline gas switch control system includes the nickel-based alloy pipeline (15) and a gas flow valve (17) fixedly arranged on the outer surface of the nickel-based alloy pipeline (15) for controlling the internal gas pressure of the triaxial stress chamber (1).