As can be seen from Figures 12 to 14 , both permeability and pressure have important influence on oil recovery (a) Permeability: for gas flooding (CO 2 , N 2 ), with the increase of permeability, the oil recovery shows an increasing trend, and the CO 2 increase effect is obvious, up to more than 90%, mainly due to the miscibility effect of CO 2 .
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Laboratory Study on the Oil Displacement Process in Low-Permeability Cores with Different Injection Fluids.
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