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The goal of the proposed research is to use the interaction between a surfactant and a polymer for efficient displacement of tertiary oil by improving slug integrity, adsorption and mobility control. The focus of this proposal is to design an inexpensive surfactant-polymer mixture that can efficiently recover tertiary oil by avoiding surfactant slug degradation, high adsorption and viscous/heterogeneity fingering. The strategy of the proposed research is to use a scaled physical areal model to monitor surfactant-polymer slug movement in well-defined laboratory-scale surfactant-polymer floods. Suitable surfactant and polymer systems will be identified from phase behavior and coreflood experiments. Polymers and surfactant concentrations will be varied and the stability of the surfactant movement will be measured in the scaled physical areal model. Vertical and horizontal injection will be studied. The scaled model, fluids and all rock-fluid properties will be adequately characterized. Mechanistic simulations will be made to capture the mechanisms of fluid flow. This simulation will be used for process scale-up and optimization. The proposed research will supply experimental data and mechanistic principles for optimum surfactant-polymer slug design

Surfactant-polymer interaction for improved oil recovery. Semi-annual report, September 1, 1996--March 1, 1997