Combined Low Salinity Brine Injection and Surfactant Flooding in Mixed−Wet Sandstone Cores

摘要: The concept of surfactant flooding has long been recognized as a promising supplement to water-based enhanced oil recovery methods. In recent years, core displacement experiments performed on clastic rock samples using low salinity brine injection fluid have proven give moderate increase in crude recovery. This paper presents new hybrid EOR process where the effect is combined with flooding. An anionic formulation was selected interfacial tension (IFT) environment containing 0.50 wt % NaCl. forms Winsor type I microemulsion at this salinity. Improved solubility and reduced adsorption or retention among advantages conditions. reports flood outcrop sandstone cores phase. Results show high more than 90% original place (OOIP) when used ...