一种改进的聚合物驱孔隙网络模型

基于幂律流体在圆管中的流动模型，建立了幂律流体剪切率与流速之间的关系式。对关系式进行校正并代入Carreau 模型中，得到了改进的Carreau 流体有效黏度模型。新模型中有效黏度是流速的函数，将原来的非线性问题简化为线性问题。应用新建立的有效黏度模型，综合考虑聚合物渗流机理建立聚合物驱微观模拟模型。进行了聚合物驱微观模拟，统计分析了聚合物驱后剩余油的微观分布规律。计算结果表明，聚合物驱后剩余油更趋分散：网络状剩余油体积比例明显减少，但油水混合状、孤粒/孤滴状、斑块状剩余油体积比例都有所提高。

An Improved Pore Network Model of Polymer Flooding

Based on the flow rate formula of power-law fluid in the tube，the relationship between shear rate and flow ratewas established. The improved effective viscosity model of Carreau fluid in the tube was derived by submitting the correctedrelationship into the Carreau model. In the new model，the effective viscosity is the function of flow rate. The original nonlinearequations are simplified as linear equations. Applying the new effective viscosity model，the microscopic simulation model forpolymer flooding is provided together with polymer seepage mechanism. Through the microscopic simulation，laws of remainingoil after polymer flooding are statistically analyzed. Microscopic simulation shows that the retained oil of network shapedecreases significantly while the volume ratio of single grain/island shape，fleck shape and oil-water mixed shape increases.