Preparation Of The Alkyl Benzene Sulfonate Surfactant With Single-component Used For EOR

The alkyl benzene sulfonate surfactant with single-component and reasonable structure was prepared by the processes ofalkylation,sulfonation and neutralization ofα-olefin. Laboratory evaluation indicates that alkaline-surfactant-polymer (ASP) system can reduce oil-water interfacial tension (IFT) to below10-3mN/m within a wide concentration range of surfactant and alkali.This kind of surfactant is favorable to different reservoirs of different blocks in Daqing Oilfield. The corresponding ASP system can greatly eliminate the chromatographic fractionation effect due to the singleness of surfactant composition. The core experiment in laboratory demonstrates that the ASP flooding can enhance original oil in place (OOIP) more than water flooding by 20%. The field test of ASP flooding in the reservoirs with small well-spacing pattern shows that it displays a response of significant oil production and water-cut drop. The ASP flooding technology using single-component surfactant is hopeful to be applied in an industrialization scale of reservoirs with higher content of clay mineral and lower permeability.