Though it is well known that CO2 decrease oil viscosity by swelling in it, the variation of physical parameters of each phase in the procedure of multiple contact is not well studied.

• CO2混相驱静混相机理，如CO2在油中膨胀并降低原油粘度很完善，但动混相机理即CO2混相多级接触过程中气液两相物性参数变化未详尽研究。