重点考虑了混相过程中的相变、相间组份分配，对低界面张力情况下的油气渗曲线进行了修正，建立了一个一维三相全组份混相驱模型。应用研究中指出了多次接触混相的“前缘”和“后缘”特征，得到了不同驱替方式的采收率指标。模型的计算结果与实验数据吻合，所确定的混相参数已得到了应用。 The phase transition and interphase component distribution in the process of mixed phase are mainly considered. The oil-gas permeation curve under low interfacial tension is modified. A one-dimensional and three-phase all-component mixed phase flooding model is established. Applied research has pointed out the characteristics of “leading edge” and “trailing edge” of multiple contact mixed phase, and obtained the recovery index of different displacement methods. The calculated results are in good agreement with the experimental data, and the mixed parameters determined have been applied.