Abstract
Surfactant polymer (SP) flooding is among the most efficient and widely accepted chemical enhanced oil recovery (EOR) processes which involves slug injection containing a polymer and surfactant. This work is aimed at understanding the effect of different deep eutectic solvents (DESs) as an additive for EOR. For this, two different DES have been synthesized, having different hydrogen bond donors and acceptors and their effect on EOR was investigated. The results show that the addition of DESs as surfactant additives significantly improves flooding performance. The addition of DES1 and DES2 at critical micelle concentration (CMC) reduced the surface tension of water by 47% and 43%, respectively. The interfacial tension was drastically reduced upon the addition of DES. Also, DES molecules were found to affect the micellization concentration of surfactants. The addition of 1000 ppm of DES1 and DES2 reduced the CMC of surfactant by 17% and 9% respectively. In addition, DESs reduced the surfactant adsorption by 34% and 22% for DES1 and DES2, respectively. These results show that prepared DESs are highly efficient and outperformed the conventional [C12mim][Cl] and [C4mim][PF6] ionic liquids. The addition of DESs further enhanced the cumulative oil recovery for surfactant polymer flooding.
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