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

作　　者：李文宏[1,2] 李彩云[1,2] 吕思思[3] 范伟[1,2] 张永强[1,2] 

机构地区：[1]中国石油天然气股份有限公司长庆油田分公司勘探开发研究院,陕西西安710021 [2]低渗透油气田勘探开发国家工程实验室,陕西西安710018 [3]武汉大学化学与分子科学学院,湖北武汉430072

出　　处：《油田化学》2015年第3期381-386,共6页Oilfield Chemistry

摘　　要：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(c_(cmc))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c_(cmc)为0.0513g/L、γ_(cmc)为26.4mN/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WinsotⅠ经WinsorⅢ到winsorⅡ型微乳液的转变;正丁醇浓度增加会导致体系从WinsorⅢ到winsorⅡ型微乳液的转变;表面活性剂浓度增加则会导致体系从WinsorⅢ到WinsorⅠ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0.5~1.5 mol/L、正丁醇加量介于0~2.2%、表面活性剂加量介于0.5%~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^(-3)mN/m数量级,满足驱油剂的使用要求。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 0.0513 g/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%re-butyl alcohol and 0.5%～8%surfactant.Under this condition,the interfacial tension between crude oil and water could achieve 10～（-3） mN/m magnitude in a short time,which satisfied the requirement of oil displacement agent.

关 键 词：相行为 中相微乳液 驱油剂 表面活性剂 支链烷基苯磺酸钠 椰油酰胺丙基羟磺甜菜碱 

分 类 号：TE357.46[石油与天然气工程—油气田开发工程] O647.2[理学—物理化学]