关键词: 三元复合驱, 单一组分活性剂, 烷基苯磺酸盐表面活性剂, 驱油效率, 提高采收率, 矿场试验

Abstract: The alkyl benzene sulfornate surfactant with single-component and reasonable structure was prepared by the processes of alkylation,sulfonation and neutralization of α-olefin.Laboratory evaluation indicates that alkaline-surfactant-polymer (ASP) system can reduce oil-water interfacial tension (IFT) to below 10^-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 OOIP of ASP flooding has enhanced by 24.66 % more than that of water displacement.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.

Key words: alkaline-surfactant-polymer flooding, single-component surfactant, alkyl benzene sulfonate surfactant, oil displacement efficiency, enhanced oil recovery, field test