| This research focuses on determining an optimum formulation of generating aqueous-based CO2 Colloidal Gas Aphrons (CGAs) than can be used for CO2 sequestration and enhanced oil recovery project. Different pairs of polymers and surfactants were tested, with varying concentrations, to determine the best polymer -- surfactant pair that can provide stable, viscous CO2 CGAs. The screening criteria used were: low shear rate viscosity (LSRV), viscosity profile, change in median diameter (d50), and frequency-time distribution.;Results of the experimental investigations have shown that stable CO2 colloidal gas aphrons can be generated under high pressure and high temperature conditions.;To simulate reservoir conditions, viscometry tests and dynamic oscillation tests were conducted on CO2 CGAs, along with the base fluid solution, under high pressures and high temperatures to determine the rheology, stability, and viscoelastic properties of CO2 CGAs and associated base fluid. |
