Static and dynamic foam/oil interactions: Potential of CO2-philic surfactants as mobility control agents

A relationship was observed between foam stability column tests and the prediction results of the spreading theory, which can be a useful preliminary screening of an oil-resistant foam. The performance of foam during injection of surfactants in sandstone cores was also supporting the preliminary screening results. However, it was shown to be dependent on different parameters (such as formation of macroemulsion once foam lamellae ruptures, and surfactant-rock surface interactions), which are not necessarily observed in the static tests results. Macroemulsion once formed hindered the performance of subsequent FomaxVII surfactant slugs to produce foam.