Coal seam hydraulic fracturing visual monitoring device

Abstract

The utility model belongs to the technical field of coal mine safety monitoring, and particularly relates to a coal seam hydraulic fracturing visual monitoring device. The device comprises a hydraulic fracturing assembly, a pressure pump, a ball injector and a water tank and further comprises a monitoring probe, an image processor and a display terminal, the monitoring probe is installed in the middle of the hydraulic fracturing assembly and connected with the image processor through a data transmission line, and the image processor is connected with the display terminal. According to the monitoring device for the hole wall in the fracturing area after hydraulic fracturing, at least one monitoring probe is installed, when the number of the monitoring probes is large, the monitoring probes are evenly installed around the circumference of the outer side of the flow controller at intervals, the situation of the hole wall is monitored in an omnibearing and visualized mode, and the monitoring device is suitable for observing the situation of the fracturing area in the hydraulic fracturing process of an underground coal seam. The condition of fracturing cracks can be judged through monitoring data, the result is visual, the observation means of underground hydraulic fracturing are enriched, and therefore the fracturing technology is optimized, the fracturing effect is improved, the effective utilization rate of hydroelectric resources is increased, and the method has important practical value and wide application prospects.

Description

Technical Field

[0001] The utility model belongs to the technical field of coal mine safety monitoring, and particularly relates to a visual monitoring device for coal seam hydraulic fracturing. Background Technique

[0002] In recent years, with the continuous high-speed development of China's economy, the annual demand for coal in China has been increasing and the population has been growing rapidly. The industrialization process has accelerated, and the coal mining efficiency has been continuously improved. However, due to the complexity of coal resource mining, the safe and efficient mining of coal still faces many challenges. As a major means of controlling disasters such as dust and rock bursts in the coal production process, hydraulic fracturing has great application value.

[0003] The hydraulic fracturing technology mainly uses a drill rig to drill holes in the coal seam according to the design plan using drill pipes. Secondly, the drill rig is successively connected to the fracturing equipment and pushed to the top of the hole. Finally, a water injection pump is used to continuously inject fracturing fluid into the coal seam. As the fracturing fluid is continuously injected, the internal pressure of the coal seam rises to reach the fracture pressure and generate fractures. As the water injection pump works, the fracture area of the coal seam continuously expands, and finally a fracture network is formed inside the coal seam, thereby transforming the coal seam structure. Although the hydraulic fracturing technology is relatively mature in terms of technical equipment, operation and implementation, there is still a lack of effective means for on-site monitoring of the hydraulic fracturing effect. Existing monitoring means are often difficult to visually and accurately present the internal situation during the fracturing process. Therefore, there is an urgent need for a new type of visual monitoring technology to directly observe the situation in the fracturing area during the fracturing process and improve the effective utilization rate of resources. Content of the Utility Model

[0004] The problem to be solved by the utility model is to provide a visual monitoring device for coal seam hydraulic fracturing.

[0005] A visual monitoring device for coal seam hydraulic fracturing includes a hydraulic fracturing assembly, a pressure pump, a ball injector, a water tank, and also includes a monitoring probe, an image processor and a display terminal. The monitoring probe is installed in the middle of the hydraulic fracturing assembly and is connected to the image processor through a data transmission line. The image processor is connected to the display terminal.

[0006] Preferably, the hydraulic fracturing assembly includes an inclinometer, a check valve, a restrictor, a packer. The packer, the restrictor, the packer, the check valve, and the inclinometer are connected in sequence.

[0007] Preferably, the monitoring probe is installed on the restrictor.

[0008] Preferably, at least 1 monitoring probe is installed. When 2 or more are installed, they are evenly spaced around the outer circumference of the restrictor.

[0009] Preferably, the monitoring probe includes a pressure sensor, a micro camera, and a lighting device; the lighting device is located in the center, and the micro camera is surrounded by it on the outside. The pixel of the micro camera is selected according to needs.

[0010] Preferably, the pressure sensor and the micro camera transmit signals to the image processor through a data transmission line.

[0011] Preferably, the packer at the end far from the whipstock is connected to the ball injector through a fracturing string, and the ball injector is connected to a pressure pump.

[0012] Preferably, the pressure pump is connected to the water tank through a high-pressure rubber hose.

[0013] Preferably, a communication valve is provided on the high-pressure rubber hose between the water tank and the pressure pump.

[0014] Preferably, a communication valve is provided on the fracturing string between the pressure pump and the packer.

[0015] The working process and operation principle of a visual monitoring device for coal seam hydraulic fracturing of the present utility model:

[0016] Step 1: Connect the whipstock, check valve, packer, throttle, monitoring probe, packer, fracturing string, ball injector, high-pressure rubber hose, water tank, and fracturing pump of the hydraulic fracturing assembly, and then connect the data transmission line of the monitoring probe to the image processor and the display terminal to form a visual monitoring device. The data transmission line connects the monitoring probe and the image processor.

[0017] Use a drilling rig to drill a hole, and then push the hydraulic fracturing assembly to the top of the hole.

[0018] Step 2: Use the lighting device in the monitoring probe to illuminate the fracturing area, use the micro camera with an ultra-wide angle in the monitoring probe to record the image of the hole wall in the fracturing area in real time, and measure the pressure in the coal seam through the sensor in the monitoring probe to complete the monitoring process;

[0019] Step 3: After monitoring, use the data transmission line fixed on the throttle to transmit the data monitored by the monitoring probe to the image processor. The image processing unit processes and analyzes the received image and data, enhances the image clarity and contrast of the hole wall in the fracturing area after hydraulic fracturing, and finally presents the clear image and relevant monitoring data after real-time processing through the display terminal;

[0020] Step 4: After a single fracturing is completed, the visual monitoring device moves to the next fracturing section with the hydraulic fracturing assembly and continues to operate until the overall fracturing operation is completed, and then exits the hole mouth.

[0021] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0022] The utility model provides a monitoring device for the borehole wall in the fracturing area after hydraulic fracturing. The coal seam hydraulic fracturing visualization monitoring device of the utility model is applicable to observing the situation in the fracturing area during the hydraulic fracturing process of the underground coal seam. By increasing the number of monitoring probes, all-round monitoring of the fracturing area can be realized.

[0023] During the monitoring process of the utility model, the data transmission line promotes the data connection and migration between the monitoring probe and the image processing unit, and the image processing unit collects and processes the data, enhances the clarity and contrast of the fracturing area image, and finally the display terminal displays it in real time. The situation of the fracturing cracks can be judged from the monitoring data, so as to optimize the fracturing process, improve the fracturing effect, and enhance the effective utilization rate of hydropower resources.

[0024] The coal seam hydraulic fracturing visualization monitoring device provided by the utility model has simple structures of its various components and intuitive results, enriches the observation means of underground hydraulic fracturing, and has important practical value and broad application prospects for the development of hydraulic fracturing. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic structural diagram of the utility model.

[0026] Figure 2 It is a schematic structural diagram of the monitoring probe of the utility model.

[0027] In the figure, 1 - deflection guide, 2 - check valve, 3 - packer, 4 - restrictor, 5 - monitoring probe, 6 - fracturing string, 7 - data transmission line, 8 - image processor, 9 - display terminal, 10 - drill rig, 11 - ball injector, 12 - pressure pump, 13 - high-pressure rubber hose, 14 - water tank, 15 - pressure sensor, 16 - micro camera, 17 - lighting device. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The drawings are only for illustrative purposes; some well-known structures and their descriptions in the drawings may be omitted, so it cannot be understood as a limitation to the utility model; the orientation names such as "upper", "lower", "front", "rear", "side", "inner", "outer", etc. are not limited to the descriptions in the embodiments. If there is no special description for the device, it can be obtained through conventional commercial channels.

[0029] The following further describes the utility model in detail with reference to the drawings and embodiments.

[0030] Embodiment 1

[0031] As Figure 1As shown in the figure, a visual monitoring device for coal seam hydraulic fracturing includes a hydraulic fracturing assembly, a pressure pump 12, a ball injector 11, a water tank 14, and also includes a monitoring probe 5, an image processor 8, and a display terminal 9. The hydraulic fracturing assembly includes a deflector 1, a check valve 2, a restrictor 4, and a packer 3. The monitoring probe 5 is installed in the middle of the hydraulic fracturing assembly, that is, the packer 3, the restrictor 4, the packer 3, the check valve 2, and the deflector 1 are connected in sequence, and the deflector 1 is at the front end. It is connected to the image processor 8 through a data transmission line 7, and the image processor 8 is connected to the display terminal 9.

[0032] One monitoring probe 5 is installed outside the restrictor.

[0033] As Figure 2 shown, the monitoring probe includes a pressure sensor 15, a micro camera 16, and a lighting device 17; the lighting device 17 is located in the center, and the micro camera 16 is surrounded outside it.

[0034] The packer 3 at the end far from the deflector is connected to the ball injector 11 through a fracturing string 6, and the ball injector 11 is connected to the pressure pump 12. The pressure pump 12 is connected to the water tank 14 through a high-pressure hose 13.

[0035] Embodiment 2

[0036] A visual monitoring device for coal seam hydraulic fracturing includes a hydraulic fracturing assembly, a pressure pump 12, a ball injector 11, a water tank 14, and also includes a monitoring probe 5, an image processor 8, and a display terminal 9. The hydraulic fracturing assembly includes a deflector 1, a check valve 2, a restrictor 4, and a packer 3. The monitoring probe 5 is installed in the middle of the hydraulic fracturing assembly, that is, the packer 3, the restrictor 4, the packer 3, the check valve 2, and the deflector 1 are connected in sequence, and the deflector 1 is at the front end. It is connected to the image processor 8 through a data transmission line 7, and the image processor 8 is connected to the display terminal 9.

[0037] Three monitoring probes 5 are installed, evenly spaced around the outside circumference of the restrictor 4. That is, the monitoring probe 5 of the visual detection device is installed on the restrictor 4 every 120°, and a total of 3 are installed to achieve full - range monitoring of the wall hole.

[0038] The monitoring probe includes a pressure sensor 15, a micro camera 16, and a lighting device 17; the lighting device 17 is located in the center, and the micro camera 16 is surrounded outside it.

[0039] The pressure sensor 15 and the micro camera 16 transmit signals to the image processor 8 through the data transmission line 7.

[0040] The packer 3 at the end far from the deflector is connected to the ball injector 11 through a fracturing string 6, and the ball injector 11 is connected to the pressure pump 12. The pressure pump 12 is connected to the water tank 14 through a high - pressure hose 13.

[0041] A communication valve is provided on the high-pressure rubber hose 13 between the water tank 14 and the pressure pump 12.

[0042] A communication valve is provided on the fracturing string 6 between the pressure pump 12 and the packer 3.

[0043] Embodiment 3

[0044] The difference from Embodiment 2 is that 4 monitoring probes 5 are installed around the outer circumference of the restrictor 4, and the monitoring probes 5 of the visualization detection device are installed on the outer circumference of the restrictor 4 at intervals of 90° to achieve omnidirectional monitoring of the wall holes.

[0045] In the description of the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", and "coupling" should be understood in a broad sense. If the connection method is not specifically described, conventional means such as bolts, rivets, and welding in the prior art are adopted. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] Certainly, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions, or substitutions made by those skilled in the art within the scope of the essence of the present invention should also belong to the protection scope of the present invention.

Claims

1. A visual monitoring device for coal seam hydraulic fracturing, comprising a hydraulic fracturing assembly, a pressure pump, a ball injector, and a water tank, characterized in that, It also includes a monitoring probe, an image processor and a display terminal. The monitoring probe is installed in the middle of the hydraulic fracturing assembly and is connected to the image processor through a data transmission line, and the image processor is connected to the display terminal.

2. The visualization monitoring device for coal seam hydraulic fracturing according to claim 1, wherein The hydraulic fracturing assembly includes a whipstock, a check valve, a restrictor, and a packer. The packer, the restrictor, the packer, the check valve, and the whipstock are connected in sequence.

3. The visual monitoring device for coal seam hydraulic fracturing according to claim 2, characterized in that, The monitoring probe is installed on the restrictor.

4. A visual monitoring device for coal seam hydraulic fracturing according to claim 3, characterized in that, At least one monitoring probe is installed on the outer circumference of the restrictor.

5. The visual monitoring device for coal seam hydraulic fracturing according to claim 4, characterized in that The monitoring probe includes a pressure sensor, a micro camera and a lighting device; the lighting device is located in the center, and the micro camera is surrounded on the outside.

6. The visual monitoring device for coal seam hydraulic fracturing according to claim 5, characterized in that, The pressure sensor and the micro camera transmit signals to the image processor through a data transmission line.

7. A visualization monitoring device for coal seam hydraulic fracturing according to claim 2, characterized in that, The packer at the end far from the whipstock is connected to a ball injector through a fracturing string, and the ball injector is connected to a pressure pump.

8. The visual monitoring device for coal seam hydraulic fracturing according to claim 7, characterized in that, The pressure pump is connected to a water tank through a high-pressure hose.

9. The visualization monitoring device for coal seam hydraulic fracturing according to claim 8, wherein A communication valve is provided on the high-pressure hose between the water tank and the pressure pump.

10. A visual monitoring device for coal seam hydraulic fracturing according to claim 7, characterized in that A communication valve is provided on the fracturing string between the pressure pump and the packer.

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