CHSB/BABS复配表面活性剂驱油体系性能研究

Properties of CHSB/BABS Complex Swrfactamt Displacing Systems

李文宏 李彩云 吕思思 范伟 张永强

LI Wenhong LI Caiyun Lü Sisi FAN Wei ZHANG Yongqiang

本文通过研究支链烷基苯磺酸钠（BABS）和椰油酰胺丙基羟磺甜菜碱（CHSB）按不同质量比复配所得表面活性剂体系的临界胶束浓度（ccmc）和平衡表面张力（γ），得到该复配体系最佳质量比为3∶7，该配比下复合表面活性剂的ccmc 为0.0513g/L、γcmc 为26.4 mN/m。进而以该复配体系为表面活性剂、不同链长的醇为助表面活性剂、氯化钠为盐组分以及原油含量2% 的模拟油为油相进行拟三元相行为研究，利用Winsor 相图和电导率扫描法探究了氯化钠、正丁醇与表面活性剂浓度对体系相态的影响。结果表明：随着氯化钠浓度的增加，体系经历了Winsor I经Winsor III到Winsor II 型微乳液的转变；正丁醇浓度增加会导致体系从Winsor III到Winsor II 型微乳液的转变；表面活性剂浓度增加则会导致体系从Winsor III到Winsor I型微乳液的转变。中相微乳液形成的最佳条件为：氯化钠浓度0.5 数1.5 mol/L、正丁醇加量介于0 数2.2% 、表面活性剂加量介于0.5% 数8% 。在该条件下，原油、水之间的界面张力在短时间内可以达到10-3mN/m数量级，满足驱油剂的使用要求。图10表1 参19

The optimum mass ratio 3∶7 of branched alkylbenzbene sulfonate sodium （BABS）and cocoamido propyl hydroxy sulfobetaine （CHSB）was obtained based on the critical micelle concentration （ccmc）and equilibrium surface tension （γ）of BABS and CHSB binary mixture ，and the ccmc of compound system was 0.0513g/L and the γcmc was 26.4 mN/m. Three phase behaviors of the mixed system，with BABS and CHSB binary mixture as surfactant，different chain length alcohols as co-surfactant，NaCl as salt component，simulation oil containing 2% crude oil as oil phase，were studied by Winsor diagram and conductivity scanning method to explore the effects of NaCl，n-butyl alcohol and surfactant concentration on the phase behavior of the system. The results showed that the system experienced microemulsion change from Winsor I to Winsor III and then Winsor II with increasing NaCl concentration，that from Winsor III to Winsor II with increasing n-butanol concentration，that from Winsor III to Winsor I with increasing surfactant concentration. The optimum formation condition of middle phase microemulsion was obtained as follows: 0.5～1.5 mol/L NaCl ，0 ～2.2% n-butyl alcohol and 0.5% ～8% surfactant. Under this condition，the interfacial tension betweencrude oil and water could achieve 10-3mN/m magnitude in a short time，which satisfied the requirement of oil displacement agent.