Research on ultralow interfacial tension flooding system of Chenzhuang crude oil

Dynamics interfacial tension determination experiment is carried out in single surfactant, surfactant combination systems and alkali + surfactant systems with Chenzhuang crude oil. The results show that CBET-13 with mass fraction of 0.05%-0.15% can make oil-water interfacial tension decreases to ultra low; While the mass ratio of SLPS and KAS is 4:1, the total mass fraction is in the range of 0.075%-0.15%, the equilibrium interfacial tension value can decrease to magnititude 10^-4 mN/m; with the total effective mass fraction of 0.1% and the mass ratio of CBET-13:CBET-17=9:1-6:4, the interfacial tension can decrease to ultra low; with the systems of alkali + surfactant (0.2%NaOH+(0.05-0.2%SLPS, 0.025%-0.05%AS-0-4, 0.01%-0.075%AS-3-0, 0.03%-0.09%HSBET-12), oil-water interfacial tension can decrease to less than 10^-3mN/m. These flooding systems can be used as flooding formulas in Chenzhuang oilfield.