微波作用下煤层渗透性变化规律实验研究

为了深入研究微波辐射条件下功率、辐射时间、渗透率、有效应力之间的关系，采用自行设计的微波辐射含瓦斯煤渗流实验系统，进行了不同微波功率、不同辐射时间条件下的煤样渗透率测量实验。研究结果表明:微波辐射条件下，渗透率与有效应力之间遵循负指数函数关系,拟合结果R2均大于0.98；渗透率随微波功率和辐射时间的增加单调递增，并且在低有效应力区数据增长的线性拟合斜率大于高有效应力区；煤样在微波作用下，相同的能量输入，微波功率越高，煤样渗透率越大；研究结果为微波辐射技术在煤层气开采领域的应用提供理论参考。

Experimental study onvariation laws of coal seam permeability under microwave

In order to deeply study the relationship among the power, radiation time, permeability and effective stress under the microwave radiation conditions, the measurement experiments on the permeability of coal samples under different microwave power and different radiation time conditions were carried out by using a self designed testing system for the seepage of coal containing gas under the microwave radiation. The results showed that under the microwave radiation conditions, the relationship between the permeability and the effective stress followed a negative exponential function, and all the fitting results R2 were greater than 0.98. The permeability increased monotonously with the increase of microwave power and radiation time, and the linear fitting slope of data growth in the low effective stress region was greater than that in the high effective stress region. For the coal samples under the effect of microwave, when the energy input was the same, the higher the microwave power, the greater the permeability of coal samples. The experimental result provide the theoretical reference for the application of microwave radiation technology in the field of coalbed methane extraction.