Abstract: Twenty six samples from Chang 8₂ reservoir in wellblock Zhuang-19 of Xifeng oilfield are tested by means of sandstone micro-model for water-oil displacement experiment for the collection of the parameters of their permeability，oil saturation before displacement, remaining oil saturation and displacement efficiency under the different waterflood time and pressure. Based on these parameters with the employment of statistic software SPSS, the authors divide the samples into three types of flow units E, G and M. With the facilitation of the dynamic observation of the experiment and data analysis, the authors demonstrate that different types of flow units have different flow path, displacement model, displacement efficiency and effect of press to displacement efficiency.

Key words: sandstone micro-model for water-oil displacement experiment, flow units, displacement efficiency, displacement pressure