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煤层气的开发实践表明,煤岩裂缝和渗透率是制约我国煤层气资源开发成败的关键因素之一。以室内实验为手段,系统研究了有效应力改变条件下煤岩裂缝宽度和渗透率的变化规律。结果表明:煤岩裂缝宽度和渗透率都随有效应力的增大而减小;当有效应力达到8 MPa后,裂缝宽度变化相对缓慢,渗透率变化也很微弱。由此可见,煤岩裂缝和渗透率对应力的变化非常敏感。
The practice of CBM development shows that the fracture and permeability of coal are one of the key factors restricting the success of coalbed methane resource development in China. By means of laboratory experiments, the change rules of coal seam fracture width and permeability under the condition of effective stress change were systematically studied. The results show that the width and permeability of coal and rock fracture decrease with the increase of effective stress. When the effective stress reaches 8 MPa, the change of crack width is relatively slow and the permeability change is very weak. Thus, coal and rock cracks and permeability of the change in stress is very sensitive.