摘要
介绍了用油藏实际开采速度作为岩心流动实验的驱替速度时 ,获得相对渗透率曲线的方法。用有限差分方法求解渗流方程组 ,建立的相对渗透率曲线模型是一不确定模型 ,有四个待定参数。用最优化方法使得累计产油量和岩心两端的压差的计算值与实测值之间的方差和最小 ,反求相对渗透率曲线模型的待定参数 ,从而确定相对渗透率曲线。这种方法克服了JBN方法的局限 ,在求低渗岩心的相对渗透率曲线时充分显示了它的优越性。
A method is proposed for determination of relative permeability from the results of a coreflooding experiment in a range of velocities representative of field flow condition. The seepage equation is solved using finite difference method. The model of relative permeability is undetermined with four undetermined parameters. The optimization method is used to make the cumulative oil production and the sum of variance between the calculated and the measured pressure drops at both ends of cores minimize. Through solving the undetermined parameters of relative permeability curve, the relative permeability curve is determined. The relative permeability at actual recovery rate may be determined by using this method. It is beyond limitation of JBN method and it's superiority reveals fully when relative permeability of low permeability cores is determined.
关键词
相对渗透率
渗透率曲线
低渗透油藏
relative permeability, permeability curve, low permeability reservoir, recovery rate, laboratory experiment
