Influencing factors and microscopic formation mechanism of phase transitions of microemulsion system

Abstract As a surfactant solution system, microemulsion has attracted much attention due to its ultra-low interfacial tension, high solubilization and thermodynamic stability in the process of enhanced oil recovery. Different from water phase system polymer flooding ASP flooding, shows special state, existence may be phase, or phase. The can divided into upper middle lower according composition system. microemulsions have different displacement efficiency, reaches tension with oil/water, efficiency is highest. In order ensure middle-phase as far possible during process, it necessary study change formation conditions detail, clarify influence concentration, additive salt content, water–oil ratio temperature on transformation mechanism microemulsion. research results some guiding significance for formulation selection slug design