黏弹性聚合物驱剩余油饱和度预测的φ函数法

THE φ FUNCTION METHOD FOR PREDICTING THE REMAINING OIL BY VISCOELASTIC POLYMER FLOODING

基于水驱油藏剩余油饱和度分布预测的φ函数法一文思路,考虑聚合物驱时流体特性,包括聚合物黏弹性、剪切稀化、不可及孔隙体积、渗透率下降系数等因素,在建立聚合物驱等饱和度平面移动方程的基础上,分析了聚合物溶液的黏度和水相渗透率所发生的变化及其对聚合物驱φ函数的影响。利用本方法和Eclipse数值模拟软件进行对比计算,结果表明:聚驱后二者聚合物浓度分布相差不大;本方法计算所得到的含水饱和度值分布比较高,说明由聚合物弹性效应所产生的拉伸黏度在驱油过程中发挥了作用,证明该方法能够准确反映黏弹性聚合物在地层中的驱油状况。

Based on the ideas of a paper named the φ function method to predict the remaining oil saturation distribution in water-flooding reservoir,considering the fluid characteristics in polymer flooding reservoir,such as polymer visco-elastic,shear thinning,non reached pore volume,permeability decline coefficient and other factors,on the basis of establishing the mobile plane saturation equation in polymer flooding,the changes of the viscosity of polymer solution and water permeability and the influence for polymer flooding function are analyzed.By using this method and numerical simulation software eclipse,the comparing calculation is carried out,the results show that the difference of polymer concentration distribution between them is small after polymer flooding,the value of the distribution of water saturation calculated with this method is relatively high,which shows that the tensile viscosity caused by the visco-elastic of polymer in the process of flooding acts.It is proved that the method can accurately reflect the flooding situation of the viscoelastic polymer in the formation.