摘要
在具有围限压力的情况下进行了煤岩体氦气和甲烷渗透率的平行实验 ;采用控制有效应力的方法 ,消除了因流体压力降低和气体解吸引起的渗透率变低问题 ;同时 ,利用克林伯格公式 ,校正了因气体分子沿壁面滑移而受影响的渗透率 ,并定量地推导了煤基质收缩引起的渗透率变化情况 .结果表明 :渗透率增量随绝对渗透率的增加而增大 ,随流体压力的减少而呈对数形式减少 ;煤岩体氦气的绝对渗透率大于甲烷的克氏渗透率 ,在有效应力不变的情况下 ,流体压力愈小 ,滑脱效应愈明显 ;滑脱效应引起的渗透率增量越大 ;
Parallel experiments for permeability of helium and methane under confining pressure were carried out. By controlling the effective stress, the problem of permeability decreasing caused by fluid pressure decreasing and gas desorption was eliminated. The permeability influenced by slippage of gas molecule along the pore or fracture wall was corrected by using the Klinkenberg formula, and the coal matrix shrinkage induced change of permeability was quantitatively educed. The result shows that the permeability increment induced by coal matrix shrinkage increases with the increase of absolute permeability and decreases in logarithm with the decrease of fluid pressure; The absolute permeability of helium is greater than that of methane.
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2002年第2期129-131,137,共4页
Journal of China University of Mining & Technology
基金
国家自然科学基金资助项目 ( 4 9972 0 5 2)
