Consideration of Application Possibility of Biosurfactant and Alkaline-surfactant-polymer (B-ASP) with Ultra-low Crude Oil/Brine Interfacial Tension for Enhancement of Oil Recovery

摘要

Alkaline-surfactant-polymer (ASP) flooding is one of the leading technologies successfully applied in enhancement of oil recovery over the last few decades. However, it has suffered from high cost and poor environmental compatibility. In this work, a new pseudo-ternary flooding system containing Na2CO3, lipopeptide biosurfactant, petroleum sulfonate, and partially hydrolyzed polyacrylamide was developed, and its possibility in enhancement of oil recovery was evaluated. Compared with the traditional ASP containing only petroleum sulfonate as the surfactant component, the interfacial tension between the new pseudo-ternary flooding system and Daqing crude oil was reduced to a low level in the order of 10(-4) mN/m, implying positive synergistic effects of the biosurfactant, lipopeptide, and petroleum sulfonate in the new B-ASP system. Meanwhile, the thermal adaptability, interfacial activity, and viscosity stability of the new B-ASP system were significantly improved. The results of this study suggest that B-ASP is a promising and cost-effective flooding system and a developing technology for tertiary oil recovery, particularly amid uncertainties pertaining to oil price fluctuations. To the best of our knowledge, this is the first report on a pseudo-ternary flooding system composed of B-ASP for oil recovery.