Abstract Geologic sequestration of CO2 in deep saline aquifers has emerged as a technology with the greatest potential to economically sequester large quantities of CO2 from a wide range of industrial operations for greenhouse gas mitigation. The displacement characteristics of CO2 injected into deep saline aquifers are essential because they control both the migration of CO2 and the available pore space in the reservoir at irreducible saturation conditions. This paper presents the steady-state brine-CO2 relative permeability measurements in a sandstone core under CO2 flooding conditions versus pressure and temperature. The results indicate a strong correlation between pressure and the endpoint relative permeability to CO2. As the pressure increased from 1200 psi to 2600 psi, the end point relative permeability to CO2 increased from 32.4% to 46.8%. Temperature was found not to strongly affect the relative permeability, although the end point relative permeability to CO2 decreased with temperature increase from 31.05°C to 38°C. This paper also describes the effects of pressure and temperature on the interfacial tension (IFT) between CO2 and brine. The IFT was observed to decrease as pressure increased and increase as temperature increased. These data will provide useful information to evaluation, analysis, and optimization of CO2 sequestration in deep saline aquifers.
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