功率声波影响煤层甲烷储运的初步探讨

The effect of power sound wave on storage and motion of coalbed methane

摘要: 分析了功率声波对煤岩介质孔隙率和渗透率的影响规律及作用机理。结果表明,功率声波能够增加煤的孔隙体积,提高甲烷在煤层中的渗透率;功率声波对煤岩等介质的主要作用机理有机械作用、激波作用、定向作用、热效应、空化作用,使煤岩层产生微裂缝,改变煤岩的孔隙结构,降低甲烷气体的粘度,从而为煤层甲烷开发提供了一种新的思路。

Abstract: The rules and effect of power sound wave (PSW) on porosity and permeation of coal or rock were analyzed.The results show that PSW can increase pore volume of coal and can enhance permeability of coalbed methane (CBM) in coal. The main mechanism of PSW acting on coal or rock is mechanical action, shock wave action, directional action, heat effect and acoustic cavitation. These effects can make coal seam produce micro-crack, change porous structure of coal and decrease viscidity of methane. The research can provide a new thinking for the exploitation and development of CBM.