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Recovery of crude oil from reservoirs requires advanced techniques known as enhanced oil recovery (EOR). Surfactant flooding is one of the promising EOR methods to meet the desired need. The surfactant can increase the microscopic sweep efficiency in the reservoir to enhance the oil recovery. The mechanism behind this is interfacial tension between oil and water reduced by the adsorption of the surfactant at the oil-water interface, and recovery of attached oil to rock surface is made by wettability alteration of rock surface from oil-wet to water-wet by adsorption of the water droplet on the rock surface and detachment of oil.

In the present study, the interfacial tension and contact angle measurements of anionic (SDS and SDBS) and cationic (CTAB and DTAB) surfactants have been investigated. Interfacial tension was also measured after addition of sodium chloride (NaCl) and partially hydrolysed polyacrylamide (HPAM). All four surfactants significantly reduce the IFT values, which are further reduced to a low value by the addition of salt. It has been found experimentally that surfactant systems change the wettability of an intermediate-wet sandstone rock to water-wet. FTIR and XRF analysis of sandstone rock was performed, and the TGA of all surfactants was also analyzed to check their stability for higher temperatures