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为揭示超声波作用对煤岩渗透率的影响规律,基于煤岩渗透率性原理,开展超声波作用下煤样渗透率测试实验。对比分析未加超声波与不同功率超声波作用下的实测数据;与此同时,超声波的加载促进了CH4气体在煤岩中的渗流,增大了煤样的渗透率;且超声波的功率越大,煤样渗透率的提高率越大。在此基础上,通过超声波功率与气体流量比的关系,推算拟合出不同围压、不同功率下煤岩的渗透率关系模型。通过实验结果分析,详细论述了超声波提高煤层气渗透性的原理。
In order to reveal the influence of ultrasonic action on the permeability of coal and rock, a coal permeability test based on the principle of coal permeability was carried out. In the meantime, the ultrasonic wave loading promotes the seepage of CH4 gas in the coal and rock and increases the permeability of the coal sample. The greater the ultrasonic power is, the larger the power of the coal is The greater the rate of improvement of permeability. On this basis, through the relationship between ultrasonic power and gas flow ratio, the relationship model of permeability of coal and rock under different confining pressures and different power is deduced. Through the analysis of experimental results, the principle of ultrasonic to improve CBM permeability is discussed in detail.