Study on Highly Efficient Mixtures of Anionic/Cationic Surfactants for Enhanced Oil Recovery
Sinopec Key Laboratory of Surfactants for Enhanced Oil Recovery, Shanghai Research Institute of Petrochemical Technology, SINOPEC, Shanghai 201208, China
Abstract：To improve oil recovery of mature oilfields with high recovery degree and high water cut, an efficient formulation consisting of blend of anionic/cationic surfactants (S1) was developed. The experimental results showed that when the temperature was 75-120 ℃, total dissolved solids (TDS) were 6 000-50 000 mg/L, divalent ions were 100-2 000 mg/L, surfactant concentration was 0.05%-0.50%, ultra-low interfacial tension of 2×10-3 mN/m and solubilization parameters of 20 could be obtained with Shengli Hekou crude oil. In addition, surface wettability of the rock was altered from oil wet to neutral wet. The in-situ microemulsion with S1 showed remarkable capacity for altering the three-phase interface forces of oil, water and rock, which help to remove the crude oil from formation and decrease the interfacial tension between oil and water.
WU Xinyue,ZHANG Weidong,SHA Ou et al. Study on Highly Efficient Mixtures of Anionic/Cationic Surfactants for Enhanced Oil Recovery[J]. 化学反应工程与工艺, 2019, 35(5): 435-441.
