摘要
建立了实用的碱 /表面活性剂 /聚合物三元复合驱数学模型 ,在力求模型简化的同时 ,较为全面地考虑了驱替过程的主要渗流机理 (如界面张力变化、粘度变化、吸附等 )。模型忽略了微乳相的形成 ,适用于低 pH值三元复合驱体系。用流线方法求解该模型 ,在结合边界元方法确定复杂边界条件下稳态渗流场流线分布的基础上 ,对流管内的一维渗流问题求解。应用显式全变差递减 (TVD)法求解饱和度方程 ;求解浓度方程过程中 ,采用Crank Nicolson差分格式进行空间项离散 ,对时间项变量进行了拟线性处理 ,保证了计算的稳定性。新建模型具有输入参数较少、计算快捷的优点 ,并适用于任意形状边界条件下各种井网配置的复合驱驱替动态计算问题。与化学驱软件UTCHEM的计算结果对比 ,证实该模型计算结果可靠、计算速度快、稳定性强 。
A mathematical model for alkaline-surfactant-polymer (ASP) flooding was presented. In order to make description of the model simplified, the complex physical and chemical behaviors of ASP flooding, such as interfacial tension change, phase viscosity change, and adsorption, were simulated. In this model, the formation of micro emulsion phase was neglected. The model is suitable for modeling the ASP system with low pH value. A streamline method was employed to solve this model instead of the traditional finite-difference methods. The streamline distribution of steady-state flow passed through media was determined with a complex boundary element method (BEM), and the one-dimensional flow problem was solved. The saturation equation was solved using an explicit total variation diminishing (TVD) method. For getting stable calculation of concentration equation, Crank-Nicolson difference format was used in spatial discretization, and quasi-linear disposition of the variables in the temporal discretization was made. The new model has the advantages of needing a little information, fast calculation and adaptation in prediction of ASP drive performances of all kinds of patterns in a random shaped porous media with assembly boundary. The validity of the new method was compared with that of the chemical flooding software UTCHEM. The results indicate that this model is reliable and more practical and has faster computing speed and good stability.
出处
《石油大学学报（自然科学版）》
CSCD
北大核心
2004年第1期58-62,共5页
Journal of the University of Petroleum,China(Edition of Natural Science)
基金
国家重点基础研究发展规划"973"项目 (G1990 2 2 5 )
石油大学博士科研基金资助项目(Y0 2 0 2 2 9)
关键词
流线方法
表面活性剂
聚合物
计算速度
边界元法
数学模型
饱和度
alkaline-surfactant-polymer flooding
mathematical model
boundary element method
streamline method
computing speed
well pattern
