Evaluation of the Performance of New Surfactants and Study of Enhanced Recovery

In order to improve the efficiency of crude oil recovery, reduce the adhesion and adsorption of crude oil in the formation, reduce the interfacial tension of oil and water to form a stable emulsion, the performance evaluation of new surfactants and methods for improving oil recovery are studied. The esterification reaction is used to synthesize the raw material of glyceryl monooleate succinic acid monoester, and the raw material is neutralized with an alkaline solution to prepare a new surfactant. Through experiments, the surfactant’s interfacial tension, salt resistance, temperature resistance, emulsification, viscosity reduction and other properties were evaluated, and the effect of changing the oil recovery rate after using the surfactant was studied. Test results show that this new surfactant can significantly reduce the water-oil interfacial tension, and can still reduce the water-oil interfacial tension even in saline environments and high temperature environments. After the temperature reaches 50°C, the temperature resistance is basically stable; When the surfactant concentration of the water-oil ratio is lower than 7:3 and higher than 700mk/L, it can reduce the viscosity of the water-oil mixture; the surfactant has good foam performance and emulsification, and can effectively improve crude oil recovery. Use 0.25% mass fraction surfactant, can effectively improve oil recovery, but abnormal low-pressure environment will affect the recovery effect.