高压电脉冲放电煤层增透研究

Research on Coal Seam Permeability Improvement by High-voltage Electric Pulse Discharge

针对现有煤层气开发和煤矿安全开采中瓦斯抽采率低的问题,给出了一种水中高压脉冲放电的煤层气增透方法。首先分析了脉冲放电过程中液电效应及产生水激波机理;然后研究了水激波作用下的煤层产生裂纹位移及裂纹扩展规律;最后搭建了1套高压脉冲放电煤层增透试验测试系统,并进行了相关煤层增透试验。试验结果表明,该方法能改变煤层孔隙和裂隙结构,提高煤层瓦斯增透效果,在煤层增透方面具有一定的可行性和优越性。

For the issue of low gas drainage rate in coalbed gas development and mine safety production, a method of coal seam permeability improvement with high-pressure pulse discharge in water was proposed. First, the electrohydraulic effect and mechanism of water-shock wave in electric pulse discharge process were analyzed. Then, the mechanisms of coal seam cracks and crack propagation were studied. Finally, a set of experimental system with high -pressure pulse discharge was built, and the coal seam permeability improvement test of high-pressure pulse discharge was carried out. The experimental results show that method can effectively change the pore and fracture structure of coal seam, and can improve the coal seam gas permeability, and has certain feasibility and superiority in seam permeability improvement.