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In heavy oil reservoir, the variations of injection pressures induce asphaltene precipitation by CO 2  flooding, which causes a reduction in recovery. This paper investigated the microscopic migration characteristics by CO 2  flooding at different injection pressures. The results showed that the migration was unobstructed, whereas the spread scope was relatively small at 2 MPa. In case of 8 MPa, there was a mixed area of oil-gas and precipitated asphaltene. A large number of asphaltene precipitations appeared, which inhibited the migration of CO 2  at 10 MPa. Additionally, the maximum recovery under 8 MPa was 58.2%, followed by 10 MPa and 2 MPa, respectively.

The effect of injection pressure on the microscopic migration characteristics by CO 2 flooding in heavy oil reservoirs