裂缝性油藏岩心渗吸实验及其应用

以裂缝性油藏为研究对象,开展了岩心静态渗吸实验,得到了不同物性岩心的渗吸采收率曲线。通过数学推导,建立了圆柱形岩心静态渗吸数学模型,并应用C++语言编程计算,得到了岩心的渗吸采收率数值曲线。通过调整数学模型中的相渗曲线和毛管力曲线参数,进行渗吸采收率数值曲线与物理模拟实验曲线的拟合,应用最小二乘法对拟合结果进行优选。根据拟合最优的渗吸采收率数值曲线,进行岩心相渗曲线和毛管力曲线的确定。

Imbibition experiment and its application of cores in fractured reservoirs

Taking fractured reservoir as study object, cores static imbibition experiment was carried out to gain the imbibition recovery curve of cores with different physical properties. The imbibition mathematical model of cylindrical core was established through mathematical deriving. The numerical curve of imbibition recovery was obtained for cores by C ＋＋ computer language programming. The numerical curve was fitted to the physical simulation experimental curve through adjusting the parameters of relative permeability curve and capillary pressure curve in the mathematical model. The fitting results were optimized by means of least-squares method. The relative permeability curve and capillary pressure curve could be determined according to the optimal numerical curve of imbibition recovery.