A device and method for combined hydraulic fracturing and microwave radiation to enhance the extraction of coal seam gas
A technology of microwave radiation and hydraulic fracturing, applied in the direction of gas discharge, safety devices, mining fluids, etc., can solve the problems of difficult desorption of coal seam gas, low gas permeability of coal seam, low gas extraction rate, etc., achieve simple process, improve desorption Efficiency, the effect of improving extraction efficiency
Active Publication Date: 2018-02-13
CHINA UNIV OF MINING & TECH
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Problems solved by technology
[0003] The present invention aims at the problems existing in the above-mentioned technical scheme, and proposes a device and method for combined hydraulic fracturing and microwave radiation to strengthen coal seam gas extraction, which solves the gas drainage rate caused by low coal seam air permeability and difficult desorption of coal seam gas low problem
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[0024] The special device of the present invention includes: the device includes: water pump 1, water tank 2, hydraulic fracturing port valve 3, microwave radiation monitoring port 4, microwave radiator 5, microwave radiation monitoring port valve 6, gas extraction port valve 7, gas pumping Production port 8, monitoring equipment 9, cementing section 10, signal transmission line 11, casing 12, waveguide 13, ground drilling 14, sensor 15, microwave radiation antenna 16, microwave radiation window 17, high-strength non-metallic screen pipe 18, Hydraulic fracturing opening 19, waveguide valve 20, gas extraction pump 21 and gas extraction pipe 22; the upper end of the surface drilling 14 is the cementing section 10, and there is a casing 12 inside the surface drilling 14, and the lower end of the casing 12 is There is a high-strength non-metallic screen tube 18, and the upper part of the casing 12 has a hydraulic fracturing port 19, a gas drainage port 8, and a microwave radiation ...
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The invention discloses a hydraulic fracture and microwave radiation combined coal bed gas enhanced extraction device and method, and belongs to surface borehole coal bed gas extraction devices and methods. A sleeve is arranged in a borehole fixing section, the lower end of the sleeve is provided with a high-strength nonmetallic screen pipe, and the upper portion of the sleeve is provided with a hydraulic facture opening, a gas extraction opening and a microwave radiation monitoring opening; a water pump is connected with the hydraulic fracture opening through a water tank and a pipeline, and a hydraulic fracture opening valve is arranged on the hydraulic fracture opening; a gas extraction opening valve is arranged on the gas extraction opening; a signal transmission line, a waveguide pipe and a microwave radiation monitoring opening valve are arranged on the microwave radiation monitoring opening, one end of the signal transmission line is connected with a monitoring device, and the other end of the signal transmission line is connected with a sensor; one end of the waveguide pipe is connected with a microwave radiator through a waveguide pipe valve, and the other end of the waveguide pipe is connected with a microwave radiation antenna and a microwave radiation window. Through the combined effect of hydraulic fracture and microwave radiation, coal bed permeation is achieved, the desorption efficiency of coal bed gas is improved, and high-efficiency extraction of coal bed gas is promoted.
Description
technical field [0001] The invention relates to a device and a method for extracting coal seam gas by drilling on the ground, in particular to a device and a method for combining hydraulic fracturing and microwave radiation to strengthen the extraction of coal seam gas. Background technique [0002] For outburst coal seams that do not have the conditions for mining protective seams, pre-pumping coal seam gas is the most effective prevention and control measure for coal and gas outburst areas. The gas content and gas pressure of the coal seam can be reduced by pre-extracting coal seam gas, thereby reducing or eliminating the risk of coal and gas outburst in the outburst coal seam, and reducing the amount of mine gas gushing out during mining. However, as the mining depth of the coal seam increases, the ground stress continues to increase, and the gas permeability coefficient of the coal seam is getting lower and lower. It is difficult to desorb the gas during the coal seam ga...
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IPC IPC(8): E21F7/00E21B43/00E21B43/26E21B43/24
CPCE21B43/006E21B43/2405E21F7/00
Inventor 胡国忠朱怡然何文瑞许家林秦伟孙邈蓝昌金
Owner CHINA UNIV OF MINING & TECH
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