An integrated device and method for electric pulse fracturing anti-permeability and gas seepage

Abstract

The invention discloses a device and method integrating electric pulse fracturing and permeability improvement and gas seepage measurement. The device and method are suitable for improving the gas extraction rate of coal seams which has low permeability and high adsorption. The device comprises a high-voltage charging power supply, a high-voltage energy storage capacitor, a high-voltage dischargeswitch, a coal sample fixing device, a hydraulic control system, a vacuum pump device, a gas cylinder and a pressure gauge. The method comprises the steps that 1, the high-voltage charging power supply is used for charging the high-voltage energy storage capacitor; 2, the high-voltage discharge switch is turned on, a coal sample is discharged through a positive electrode and a negative electrode,huge energy is generated and directly acts on a coal body, and cracks are formed in the coal body; and 3, the permeability of the coal sample subjected to breakdown is measured through a built-in gasseepage device in the coal sample fixing device. According to the device and method, integral electric pulse fracturing and permeability improvement and gas seepage measurement can be realized; the method is accurate in measurement, convenient to operate and capable of providing a reliable basis for the electric pulse fracturing effect.

Description

technical field [0001] The invention relates to the technical field of coal mine gas drainage, in particular to an electric pulse fracturing anti-permeability and gas seepage integrated experimental device and method suitable for studying problems such as difficulties in coal seam gas drainage. Background technique [0002] In recent years, as my country's coal mining has gradually entered the deep mining stage, problems such as high ground stress and difficulty in gas extraction have become particularly prominent, and the key to solving this problem lies in gas drainage. At present, the commonly used gas drainage methods mainly include: hydraulic fracturing, deep hole blasting, hydraulic slitting, and protection layer mining. However, there are some defects in the application of these technologies. The channel for migration; it is difficult to send medicine in deep hole blasting; the application effect of hydraulic slotting in soft coal seam is poor; the mining of protectiv...

AI Technical Summary

Problems solved by technology

At present, the commonly used gas drainage methods mainly include: hydraulic fracturing, deep hole blasting, hydraulic slitting, and protection layer mining. However, there are some defects in the application of these technologies. Migration channel; it is difficult to send medicine in deep hole blasting; the application effect of hydraulic slotting in soft coal seam is poor; the mining of protective layer is not suitable for mining in a single coal seam

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