关键词: 磺化脂肪酸酯, 磺化反应, 磺酸盐驱油剂, 界面活性, 三次采油

Abstract:

A novel sulphonate oil-displacement surfactant was made in laboratory using ester and fuming sulfuric acid and by hydrolysis and neutralization technologies.The optimum volume ratio of ester to fuming sulfuric acid is 7:1,the optimum reaction time is 4h,and the optimum reaction temperature is 40℃.The structure of the product was characterized by IR and 1H NMR.It indicated that the double bonds in ester were sulphonated and then converted into the corresponding saturated hydrocarbon ester sulphonate after hydrolysis.The evaluation on the interfacial activity of the product shows that the product has excellent capacity and efficiency to reduce the oil-water interfacial tension of Block 1 and Block 2 in Shengli Oilfield to the ultra-low value(10^-3mN/m) under the condition of no-adding alkaline and other additives.The lowest value of the interfacial tension is 7×10^-4mN/m.The product possesses good salt-resisting capacity and can reduce oil-water interfacial tension to 10^-3mN/m even with the concentration of NaCl ranged from 2×10³mg/L to 13×10⁴mg/L or with the concentrations of Ca²⁺ and Mg²⁺ below 500mg/L.

Key words: sulphonate fatty acid ester, sulphonation, sulphonate surfactant, interfacial activity, tertiary recovery