(379h) Synthesis of Surfactants and Evaluation of Their Potential for Enhanced Oil Recovery Applications

Enhanced oil recovery (EOR) methods hold considerable promise for extracting residual oil after primary and secondary extraction processes. These methods commonly involve the application of various chemicals, including surfactants, alkalis, nanofluids, polymers, and co-solvents, to modify intermolecular interactions at the rock-oil-water interface. By changing wettability, reducing interfacial tension (IFT), and altering viscosity, these chemicals facilitate improved oil mobility. However, conventional EOR chemicals often face stability issues and substantial retention challenges.

This study aims to evaluate the effectiveness of recently developed surfactants as EOR agents, particularly under challenging reservoir conditions characterized by high temperatures and salinity levels. The surfactants were synthesized using a simple method, involving the amidation and quaternization. The successful synthesis of surfactants was confirmed through NMR and FTIR analysis.

These surfactants demonstrated notable solubility in both formation and seawater without experiencing phase separation. Thermal Gravimetric Analysis (TGA) data revealed decomposition temperatures exceeding 250°C, surpassing typical reservoir temperatures. The interfacial/surface studies revealed similar and/or better performance of locally synthesized surfactants compared to commercial substances.

The exceptional properties exhibited by these surfactants suggest significant potential for application in high-temperature, high-salinity reservoirs.