确定ASP复合驱相对渗透率曲线的最优化方法

ASP复合驱油体系相对渗透率曲线的确定是研究ASP复合驱油体系的驱替机理和数值模拟的关键技术,由于ASP复合驱的复杂性,单纯依靠实验测定其相对渗透率曲线是很困难的.本文应用渗流力学和最优化理论,将瞬时界面张力和聚合物的影响引入相对渗透率曲线模型,给出了描述ASP复合驱油体系的数学模型及相对渗透率曲线参数估计的最优化模型,用原油采收率和岩心两端压差的加权平均作为拟合的目标函数,采用变尺度的最优化方法,反求出相对渗透率曲线模型中的参数.实例计算结果表明,该ASP复合驱油体系的数学模型及求相对渗透率曲线的最优化方法是可行的和可靠的,并可有效地克服参数初值的敏感性问题.

THE DETERMINATION OF RELATIVE PERMEABILITY CURVES OF ASP COMBINATION FLOODING BY USING OPTIMIZATION METHOD

The determination of relative permeability curves of ASP combination flooding is a very important work in studying ASP flooding mechanism and numerical simulation.It is very difficult that only relying on experimental technology to determinate ASP system relative permeability curves due to complexity of ASP combination flooding.In this paper,the influences of the transient interfacial tension and polymer concentrations are considered in relative permeability curves model.By applying percolation flow mechanics and optimization principle,the mathematical optimization model of parameter estimate of the ASP combination flooding of relative permeability is given.The target function of the optimization problem is established as the weighted mean of oil recovery and pressure difference.By using the optimization method of DFP,the parameter estimate value of the relative permeability curves are obtained.The calculation results show that the mathematical model of ASP combination flooding and the optimization calculation method is reliable.The sensitivity problem of the initial parameter value has been also solved.