中文摘要：

随孔隙压力的增大,煤的渗透率呈＂V＂字形变化,渗透率最小值对应的孔隙压力为临界孔隙压力。研究表明：临界孔隙压力两侧是2种物理机制不同的渗流过程,当孔隙压力小于临界孔隙压力时,渗流以滑脱效应为主,滑脱系数与围压之间的关系呈＂V＂字形变化;当孔隙压力大于临界孔隙压力时,气体流动以线性渗流为主,渗透率的倒数与孔隙压力的平方呈线性关系。研究对于从机制上正确认识低渗透煤储层的渗流过程具有重要意义。

英文摘要：

With the increase of pore pressure,coal permeability changing in V shape. The critical pore pressure is the pore pressure corresponding to the minimum permeability. Results show that both sides of critical pore pressure are two different physical mechanisms percolation process. When pore pressure is less than critical pore pressure,flow mainly to slippage effect. The relationship between slip coefficient and confining pressure shows a V shape change. When pore pressure is greater than critical pore pressure,the gas flow in a linear flow-based. The relationship between reciprocal of permeability and square of pore pressure is linear. This study is important for a correct understanding from the mechanism of low permeability coal reservoir flow process.