表面活性剂-聚合物驱油的非线性色谱过程模拟

Simulation of nonlinear chromatographic process for surfactant-polymer flooding

复合驱油过程是一个多相色谱过程.运用多相多组分非线性色谱模型,模拟了表面活性剂-聚合物驱油过程,用特征线法求出相饱和度和组分浓度波的特征速度,然后,用特征向量积分给出它们在物理空间上的分布剖面.结果表明,聚合物浓度激波先于表面活性剂激波出现;相饱和度受溶质运动的影响可以产生多重激波,这使油相流动能迅速形成油墙.利用该模型讨论了溶质浓度、驱替速度、吸附和分配参数对采收率的影响.

The combined flooding in oil recovery is a multiphase chromatographic process. Modeling for multiphase, multicomponent nonlinear chromatography was applied to simulation of the surfactant/ polymer flooding process. By means of the method of characteristics, the characteristic velocities of saturation and concentration waves were solved. Then, integrating the eigenvectors led to wave profiles of saturation and concentration in physical spatial domain. The simulation results indicated that the concentration shock of polymer appeared earlier than that of surfactant; moreover due to solutes＇ movement, saturation wave could develop into multi-shock, which enabled the oleic flow to form oil bank rapidly. In addition, the influencing factors, such as concentration, flow velocity, adsorption constant and partitioning coefficient were also discussed.