孔隙介质中油相非平衡吸附的数学模型

针对目前理论上描述储层孔隙介质时对流体吸附的研究很少的问题，把油相（凝析油、原油）看作为一个多组分液态烃的高分子溶液，以吸附过剩量为基础，用基团贡献法（UNIFAC法）确定溶液中各组分的活度系数，引入相平衡数据热力学一致性的检验方程（GibbsDuhem），并结合达到吸附平衡时吸附相和体相的逸度相等、以及其他关联式得到平衡态吸附数学模型的一般表达式；同时考虑到相间存在质量传递，相平衡过程不可能在瞬间完成，从而引入与时间相关的组分模型，得到非平衡吸附的数学模型。

MATHEMATICAL MODEL OF OIL PHASE NONEQUILIBRIUM ADSORPTION IN POROUS MEDIA

Aiming at the issue that little research is conducted on reservoir porous media absorbing fluids，oil phases(condensated oil and crude oil)is regarded as multicomponent liquid hydrocarbon macromolecular solution，based on the excessive absorption，the UNIFAC method is used to determine the activity coefficient of each component in the solution，by introducing the testing equation(GibbsDuhem equation)of phase equilibrim thermodynamic consistency，combined with the existing same fugacity between absorption phase and bulk phase while absorption getting equilibrim，as well as the relational expressions，the general expression of mathematic model of equilibrim state absorption can be obtained，meanwhile，considering mass transfering among phases and the process reaching phase equilibrim not instantaneously，the component mode related to time is introduced，so as to obtainthe mathematic model of nonequilibrim absorption.