Abstract
Water in oil emulsions have turned into interesting and attractive resources for enhanced oil recovery (EOR). The stability of emulsions is important for its efficiency as EOR agents. The objective of this study was to investigate the simultaneous influence of ultrasound waves and microorganisms on the stability of water-in-oil emulsions. To this end, using an Iranian crude oil, two types of waters, surfactants and three types of biosurfactants producing microorganisms the impacts of temperature, ultrasonic frequency, and radiation time on the stability, viscosity and surface tension of water-in-oil emulsions were studied. From the results of this study, it can be pointed out that compared to the conventional surface-active agents; biosurfactants have a higher impact on the stability of emulsions. In addition, under the optimum conditions of this study, the surface tension decreased about 15% and the stability increased nearby 20%. Ultrasonic radiation reduces emulsion stability by about 6%. The T.F. species have the greatest effect on the emulsion stability up to 70 °C (more than 85%). Micromodel flooding experiments showed that injection of T.F biosurfactants emulsion provides the highest oil recovery due to their high stability, high viscosity, and low surface tension.
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