岩性油气藏 ›› 2016, Vol. 28 ›› Issue (5): 123129.doi: 10.3969/j.issn.1673-8926.2016.05.016
• 讨论与争鸣 • 上一篇
李传亮1,朱苏阳1,刘东华2,聂 旷3,邓 鹏1
Li Chuanliang1, Zhu Suyang1, Liu Donghua2, Nie Kuang3, Deng Peng1
摘要:
岩石的气测渗透率高于液测渗透率,且具有压力依赖性,该现象被称作滑脱效应或 Klinkenberg 效应。通过理论和测试资料分析,并结合流体力学原理,对该现象进行深入研究后认为,滑脱效应是一个错误认识。气测渗透率的压力依赖性是由于在计算渗透率时气体黏度取值不当所致,气体黏度在低压下随压力变化很大,但计算渗透率时却选用了定值。滑脱效应将使气体的黏度无法测量,从而出现测试悖论。气体分子时刻在做不规则的热运动,会不停地与孔隙壁面发生碰撞,致使气体无法出现滑脱。岩石渗透率的气测值高于液测值,是测试介质的分子尺度与孔隙尺度对比的结果。地下不存在离散形式的自由分子流。孔隙中只存在几个甲烷分子的地层没有开采价值,不应该作为研究对象。滑脱效应对生产实践没有任何指导意义,建议今后不再对气测渗透率进行滑脱校正。
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