多孔介质中泡沫流动等效数学模型

摘要

An equivalent numerical simulation model that can describe the foam flowing rules in porous medium is constructed based on ultimate capillary pressure. In this model, the change of flow resistance of foam in porous medium is described through gas relative permeability after foam formation, and the foam flow resistance is showed as the function of critical oil saturation, critical surfactant concentration, ultimate capillary force, reservoir permeability, gas-liquid ratio and gas flowing rate. It studies core displacement results match of foam flooding in laboratory and foam profile control numerical stimulation of 3D geologic model. The results indicate that the constructed numerical simulation model can correctly imitate the displacement mechanism of foam flooding.%建立了一个基于临界毛管压力并能够描述多孔介质中泡沫流动规律的等效数学模型。模型采取改变形成泡沫后气相相对渗透率的形式描述泡沫在多孔介质中流动阻力的变化，泡沫流动阻力表述为临界含油饱和度、临界表面活性剂浓度、临界毛管力、油藏渗透率、气液比和气相流速的函数。进行了泡沫驱实验岩心驱油结果拟合和三维地质模型泡沫调剖效应数值模拟研究，证实了所建立的数学模型能够正确地模拟泡沫驱油机理。