Method for improving coal seam gas permeability through high energy acoustoelectric composite technology

Abstract

The invention discloses a method for improving coal seam gas permeability through a high energy acoustoelectric composite technology to mainly solve the problems that the prior art pollutes a coal seam, cannot thoroughly improve the coal seam gas permeability, cannot improve the coal seam gas desorption and seepage and the like. According to the method for improving the coal seam gas permeability through the high energy acoustoelectric composite technology, high electric field pulses and sound waves are combined, the coal seam generates new cracks due to functions of impact wave generation, mechanical vibration and the like, original cracks are expanded, and accordingly coal seam gas transport channels are increased; meanwhile the coal seam gas deabsorption is improved through generated high-temperature effect, cavitation effect and the like and the gas filtration capacity is improved. The method for improving the coal seam gas permeability through the high energy acoustoelectric composite technology comprises a ground drainage well drilling method and a drainage drill hole method parallel to the coal seam. An implementation process comprises the following steps of (1) pulling out devices inside a drill hole; (2) injecting water to the drill hole and drill well through drift tools such as a well gauge, arranging an acoustoelectric composite action device at an appointed position and dividing the coal seam into different sections, wherein the thickness of every section is 30cm; (3) enabling the action device to repeatedly act in the sections; (4) pulling out the devices such as the acoustoelectric composite action device; (5) exhausting and mining the drill hole of the coal seam.

Description

technical field [0001] The invention relates to a method for improving the air permeability of coal seams by using high-energy acoustic-electric composite technology, which can be used for gas drainage drilling in ground coal seams and underground drainage drilling along coal seams, and belongs to the field of energy. Background technique [0002] my country is the country with the largest coal production and consumption in the world, and it occupies an important position in the proportion of my country's energy structure. At present, coal accounts for 76% and 68.9% of my country's primary energy consumption, production and consumption structure, and coal will still account for more than 50% of primary energy in the next 20 years. [0003] In my country's coal mine production, gas has become an important factor restricting the development of the coal industry. Moreover, there are many gas mines in my country. High gas mines and coal and gas outburst mines account for about ...

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Problems solved by technology

However, due to the large differences in the conditions of coal seams in my country, although the above methods have certain effects, coal mine accidents still occur frequently

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