生物基两性离子型表面活性剂在不同驱油体系中的乳化稳定动力学  

Emulsion-Stabilizing Kinetics of Bio-Based Zwitterionic Surfactant in Different Oil Flooding Systems

作　　者：黄金[1,2] 于洪洋 李锋 张宇[1] 张坤[1] 王俊 李翠勤[1] HUANG Jin;YU Hongyang;LI Feng;ZHANG Yu;ZHANG Kun;WANG Jun;LI Cuiqin(Provincial Key Laboratory of Oil&Gas Chemical Technology,College of Chemistry&Chemical Engineering,Northeast Petroleum University,Daqing 163318,China;Heilongjiang Provincial Key Laboratory of Oilfield Applied Chemistry and Technology,Daqing Normal University,Daqing 163712,China)

机构地区：[1]东北石油大学化学化工学院石油与天然气化工省重点实验室,黑龙江大庆163318 [2]大庆师范学院油田应用化学与技术省重点实验室,黑龙江大庆163712

出　　处：《石油学报（石油加工）》2022年第6期1347-1356,共10页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：大庆油田有限责任公司项目(40120162)基金资助。

摘　　要：为探索生物基两性离子型表面活性剂(CNBS)在矿化度高于5 g/L体系中的驱油性能,研究该表面活性剂在不同驱油体系中的界面活性和乳化稳定动力学。结果表明,当该表面活性剂质量浓度为1.29 g/L、矿化度为32 g/L、NaOH质量分数为2.5%时,形成稳定W/O型乳状液,油/水界面张力降低至9.60×10^(-4) mN/m。当体系中总含水体积分数在40%~80%范围时,表面活性剂的加入有利于形成W/O型乳状液,且表面活性剂浓度是影响模拟乳状液稳定动力学的关键因素;随其浓度增大,模拟乳状液的破裂速率常数降低、半衰期和油相含水率增大,模拟乳状液的稳定性增强;当表面活性剂质量浓度为1.50 g/L,模拟乳状液稳定性最好。该表面活性剂与NaOH和黏均相对分子质量为2.5×10^(7)的部分水解聚丙烯酰胺(HPAM)具有良好的协同效应,当表面活性剂浓度较低时,三元体系形成稳定W/O型乳状液。分子动力学模拟结果表明,油/水中加入该表面活性剂可使油/水界面膜厚度增大、界面能降低,形成稳定的乳状液;体系中加入NaCl和NaOH,油/水界面膜厚度和界面能均降低,乳状液的稳定性增强。To explore the oil displacement performance of bio-based zwitterionic surfactant(CNBS)in oil flooding systems with a salinity of above 5 g/L,the interfacial activity and emulsion-stabilizing kinetics of the surfactant in different oil flooding systems were investigated.The results show that a stable W/O emulsion can be formed and the oil-water interfacial tension is reduced to 9.60×10^(-4) mN/m when the surfactant mass concentration is 1.29 g/L,the salinity is 32 g/L,and the NaOH mass fraction is 2.5%.The addition of the synthesized surfactant is helpful to form W/O emulsion when the bulk volume fraction of water content in the systems ranges from 40%to 80%;the surfactant concentration is a key factor influencing the emulsion-stabilizing kinetics of the emulated emulsion;the increasing surfactant concentration leads to a decrease in the rupture rate constant,an increase in the half-life time and water content of oil phase,as well as the enhancement of emulsion stability;the emulsion has the best stability when the surfactant mass concentration is 1.5 g/L.The bio-based zwitterionic surfactant has good synergistic effects with NaOH and partially hydrolyzed polyacrylamide(HPAM,M_(η)=2.5×10^(7)),and the alkali-surfactant-polymer system can form a stable emulsion when the surfactant concentration is fairly low.The molecular dynamics simulation results show that the addition of bio-based zwitterionic surfactant in the emulsifying system can increase the thickness of oil/water interfacial film and decrease the oil/water interfacial energy,which is prone to form a stable emulsion;the addition of NaCl and NaOH can decrease the thickness of oil-water interfacial film and the oil-water interfacial energy,thus making emulsion stabler.

关 键 词：生物基两性离子型表面活性剂 界面活性 乳化稳定动力学 分子动力学模拟 

分 类 号：O648[理学—物理化学]