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CO 2  flooding is a significant technology for oil recovery, to reveal the microcosmic mechanism of CO 2  flooding, CO 2  slim tube experiments, long core CO 2  flooding experiments, gas chromatography analysis experiments, and numerical simulations were carried out. The results show that the miscibility increase can improve the effect of dissolution and diffusion in the CO 2 -crude oil system, easing the CO 2  finger entry phenomena, and delaying gas breakthrough time. Besides, the CO 2  -crude oil interaction is enhanced by increasing the pressure difference between the injection well and the production well, which improves the oil recovery of CO 2  flooding. Besides, CO 2  carries the light and medium components (C 4 ~ 25 ) forward to cross the first miscible zone, which makes the CO 2 -crude oil system form double miscible zones. This study reveals the rule of CO 2  front and light components front under different miscibility degrees of CO 2  flooding from the microscopic perspective and deepens the theory of CO 2  flooding in low-permeability sandstone reservoirs.

The characteristics of CO 2 front dynamic migration in low permeability sandstone oil reservoirs under different miscibility degrees