In order to further improve the recovery of oil after binary composite flooding in offshore oil fields,based on the development contradiction existing after the binary flooding,combined with the indoor physical simulation experiment,three different combinations of oil displacement systems were designed on the basis of conventional oil displacement agents. According to the characteristics of the reservoir after the binary flooding,three kinds of high concentration polymer flooding,high concentration polymer + two yuan and heterogeneous phase were proposed and compared with the experiment. The results showed that the three experimental schemes showed different degrees of secondary decline in water,the shunt rate of the high permeability layer decreased,and the shunt rate of the medium and low permeability layer increased.The recovery rate of experiment was 13.55%,10.93% and 16.05%,respectively.It provides technical support for subsequent profile optimization and individual well personalized design,which lays the foundation for the completion of a set of recovery technology method system after a set of two yuan flooding.

Principle of litho electric experiment and threedimensional physical simulation system were used to research the swept law of binary. By the pressure recorder and resistivity measuring probe installed on the model, the change of the pressure and saturation in the model was accurately measured and swept law of the binary compound flooding system was evaluated. The results showed that the swept volume of low permeability layer was expanded by the binary system, and the sweep efficiency of the model was also improved. After binary flooding, the unswept areas mainly concentrated on both sides of the mainstream line in the layer of low and middle permeability, and there is unswept areas shunt online between the production wells because of the influence of border and injectionproduction well.