Hydraulic fracture and microwave radiation combined coal bed gas enhanced extraction device and method

Abstract

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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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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