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

摘要: Abstract Examination of the nature and extent CO2 foam/oil interactions is essential for successful design application surfactants in foam assisted water alternating gas (FAWAG) process. A structure–property relationship based on theoretical method, static bulk tests, dynamic displacements porous media subjected to flooding provided this study. Surfactants with an increased affinity towards are intended improve mobility control mechanism a Malaysian oil reservoir. Two anionic foaming agent (in-house developed FomaxII industry benchmark alpha olefin sulfonate (AOS)), two CO2-philic FomaxVII UTP-Foam) selected investigate effect surfactant tail groups phase system CO2-oil-brine. The presence CO2/water oil/water interfaces under reservoir conditions measured by using high pressure, temperature tensiometer. higher tolerance against stability column tests equilibrium spreading coefficients model. alternated (SAG) then conducted dissolved injection brine study at conditions. was observed between prediction results theory, which can be useful preliminary screening oil-resistant foam. performance during sandstone cores also supporting results. However, it shown dependent different parameters (such as formation macroemulsion once lamellae ruptures, surfactant–rock surface interactions), not necessarily Macroemulsion formed hindered subsequent slugs produce