Carbon dioxide flooding performance monitoring and forecasting in the Weyburn oil field (Saskatchewan)

Successfully operating and managing a CO2 flooding scheme requires the ability to obtain accurate information regarding the actual performance of the reservoir and injected fluid. Based on the material balance principle, a tank model was presented to provide a straightforward way to evaluate the CO2 flooding performance and to assist manipulation of the CO 2 injection process. In this model, the actual overall reservoir dynamic performance is monitored by examining the volume change of reservoir and the fluids injected, formation pore volume and the change of reservoir pressure. Since the fluid phase behavior variation and compositional effect significantly influence the reservoir performance during the CO 2 flooding process, phase behavior description results of CO2/oil mixture and CO2/water mixture were integrated in the study model. The effects of reservoir pressure, rock compressibility, fluid saturation, amount of fluid injected, and the initial injection time on reservoir performance were also examined. Accordingly, the key parameters controlling the recovery process and CO2 storage capacity were determined. (Abstract shortened by UMI.)...