多孔介质中气体滑脱效应及其对渗流的影响分析

Effect Analysis of Gas Slippage on Percolation in Porous Media

结合K linkenberg气测渗透率表达式和渗透率与平均孔隙半径的关系式改进了滑脱因子及气体渗流规律表达式。进行了不同气体渗流实验;不同渗透率岩心中的气体渗流实验;不同温度下的CO2气体渗流实验;残余液体饱和度条件下的CO2渗流实验。结合公式及实验分析表明,CO2渗流的滑脱因子较大,非线性渗流程度强于N2渗流;高渗透岩心中气体渗流线性相关性较好,低渗透岩心中低压阶段非线性渗流十分明显;较高温度条件下,气体滑脱效应较大,气体非线性渗流明显;单相CO2渗流曲线存在着较强的滑脱效应,液相饱和度存在,削弱了滑脱非线性渗流规律。

Slippage factor function and gas percolation equation are improved,combining Klinkenberg expression and relationship of permeability and average pore radius.Different gases percolation,gas percolation of cores with different permeability,CO2 percolation with different temperature,and CO2 percolation in residual liquid saturation experiments are studied.The results show that,slippage factor of CO2 is bigger than N2,and nonlinear flow of CO2 is stronger than N2.Linear correlation of gas flow in high permeabil...