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本文利用随机泡沫数目守恒模型对均质多孔介质内泡沫液渗流过程的入口效应进行了数值研究.随机泡沫数目守恒模型仅利用两个参数:泡沫生成速率Kg与最大泡沫个数n∞,来描述多孔介质内非稳态驱替过程中泡沫的生成和发展.采用IMPES方法对二维介质内泡沫两相渗流过程的控制方程组进行求解,基于驱替过程中液相压力、液相饱和度及气泡密度分布等参数的分析,对泡沫驱替过程的入口效应进行了详细研究.结果发现,增大泡沫生成速率Kg,泡沫渗流过程的入口效应减小;而增大参数n∞,虽可提高驱替压差,但对多孔介质入口段各参数的分布规律影响不大.“,”Numerical investigation has been carried out concerning the inlet effect of foam flow process in a homogeneous porous media based on the stochastic bubble population balance model.The stochastic bubble population balance model could predict simply and robustly the bubble growth and development behavior in the transient foam displacement process in porous media by employing only two parameters:the foam generation rate of Kg and the maximum bubble number of n∞.The governing equations for two-dimensional two-phase foam seepage process are solved through IMPES method,and the distribution characteristics of water phase pressure,water saturation and bubble density are analyzed to investigate the inlet effect in a foam flow process in the porous media.The results show the parameter variations in the inlet region could be suppressed at higher Kg values,indicating less inlet effect at higher foam generation rates.Although it shows higher pressure drop along the sample,increasing the n∞ value has little effect on the distribution laws of various parameters in the entrance region of the porous media.