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Abstract
ABSTRACT In heavy oil reservoir, the variations of injection pressures induce asphaltene precipitation by CO2 flooding, which causes a reduction in recovery. This paper investigated the microscopic migration characteristics by CO2 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 CO2 at 10 MPa. Additionally, the maximum recovery under 8 MPa was 58.2%, followed by 10 MPa and 2 MPa, respectively.
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