再谈滑脱效应

发布时间：2018-03-09 14:51

本文选题：岩石　切入点：渗透率　出处：《岩性油气藏》2016年05期 　论文类型：期刊论文

【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。
[Abstract]:The gas-measured permeability of rock is higher than that of liquid-measured permeability, and it is pressure dependent. This phenomenon is called slippage effect or Klinkenberg effect. Through the analysis of theory and test data, combined with the principle of fluid mechanics, it is considered that, The slip effect is a misconception. The pressure dependence of gas permeability is due to the improper selection of gas viscosity in the calculation of permeability, and the gas viscosity varies greatly with the pressure at low pressure. The slip effect will make the viscosity of the gas undetectable, which will lead to the paradox of testing. The gas molecules will constantly collide with the pore wall during the irregular thermal movement. The gas is unable to slip. The gas value of rock permeability is higher than that of liquid. There is no discrete form of free molecular flow underground. There are only a few methane molecules in the pore that have no value for exploitation. The slippage effect has no guiding significance in production practice, and it is suggested that no further slippage correction should be carried out on the gas permeability measurement in the future.
【作者单位】：西南石油大学石油与天然气工程学院;中海石油(中国)有限公司湛江分公司;中国石油大学(北京)石油工程学院;
【基金】：国家重大科技专项“特高含水期多层非均质油藏渗流机理及水驱开发规律研究”(编号:2016ZX05054010) 国家自然科学青年基金项目“基于离子变化的高温高压CO_2-烃-地层水热力学实验及理论研究”(编号:51404205)联合资助
【分类号】：TE31

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