煤中吸附气体的渗流规律研究  

STUDY OF ADSORBED GAS SEEPAGE LAW IN COAL

作　　者：冯增朝[1] 郭红强[1] 李桂波[1] 赵静[1] 吕兆兴[1] 

机构地区：[1]太原理工大学采矿工艺研究所,山西太原030024

出　　处：《岩石力学与工程学报》2014年第A02期3601-3605,共5页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(51104105)

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。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.

关 键 词：采矿工程 滑脱效应 低渗透煤层 渗流 孔隙压力 

分 类 号：TD712[矿业工程—矿井通风与安全]