Systematic investigation of the effects of an anionic surface active ionic liquid on the interfacial tension of a water/crude oil system and its application to enhance crude oil recovery

Abstract

A typical anionic surface active ionic liquid (SAIL), 1-butyl-3-methyl-imidazolium dioctylsulfosuccinate (BMOT), was introduced to chemical enhanced oil recovery. The ability of BMOT to reduce the interfacial tension (IFT) of water/crude oil was evaluated for its potential application in surfactant flooding. Compared with the traditional anionic surfactant AOT and another anionic SAIL 1-butyl-3-methylimidazolium dodecyl sulfate used in the control experiments, the effects of intramolecular electrostatic attraction and size match were employed to interpret the high interfacial activity of BMOT. The effects of salt and temperature on the water/crude oil IFT further verified the proposed mechanisms. Moreover, BMOT exhibited a satisfactory displacement performance to greatly improve the crude oil recovery (12.5% of the initial oil in place) in core flooding tests.

Graphical Abstract

Keywords:

• Anionic surface active ionic liquid
• interfacial tension
• electrostatic attraction
• size match
• enhanced oil recovery

Acknowledgments

The authors are grateful for funding from the National Natural Science Foundation of China (No. 21403301), the Basic Fundamental Research Funds of Qingdao (16-5-1-41-jch), the Fundamental Research Funds for the Central Universities (16CX02058A), the foundation of Key Laboratory of Colloid and Interface Chemistry (Shandong University), Ministry of Education (201402) and National Training Program of Innovation and Entrepreneurship for Undergraduates (No. 201810425013).