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针对煤层气相渗透率对煤层气开采的重要作用,对3块煤样品进行气相渗透率变化实验,分析有效应力和气体滑脱效应对渗透率变化的控制作用。实验结果表明,随有效应力的不断增加,气相渗透率不断下降;当有效应力增大到10 MPa时,会产生气体滑脱现象,导致气相渗透率升高。
In view of the important role of CBM permeability on CBM production, three coal samples were tested for permeability change, and the control effect of effective stress and gas slippage on permeability change was analyzed. The experimental results show that with the increasing of effective stress, the gas permeability decreases continuously. When the effective stress increases to 10 MPa, the phenomenon of gas slippage will occur, resulting in the increase of gas permeability.