驱油用表面活性剂的乳化性能研究  

Research on emulsification property of surfactant for oil displacement

作　　者：蒲万芬[1] 唐艳丽[2] 赵田红[2] 

机构地区：[1]西南石油大学石油与天然气工程学院,四川成都610500 [2]西南石油大学化学化工学院,四川成都610500

出　　处：《油气藏评价与开发》2017年第4期41-45,共5页Petroleum Reservoir Evaluation and Development

基　　金：国家重点基础研究发展计划"陆相致密油高效开发基础研究"项目子课题"提高致密油储层采收率机理与方法研究"(2015CB250904)

摘　　要：筛选降界面张力能力不同的表面活性剂体系进行乳化性能测试,研究原油乳状液的乳化稳定性。实验结果表明,表面活性剂乳化稳定性不仅取决于其降界面张力能力,还与油水界面膜强度和乳状液黏度等因素有关。CDEA乳状液油水界面膜强度大,黏度高,乳化液滴尺寸小,乳化稳定性更好。界面扩张黏弹测试证实,扩张模量越大,界面膜强度越大,乳状液越稳定。岩心驱替实验表明,对中渗(100×10^(-3)μm^2)岩心表面活性剂主要通过乳化作用扩大波及体积提高洗油效率;而对低渗(10×10^(-3)μm^2)岩心进行表面活性剂主要依靠降低界面张力提高采收率。surfactants with different ability of reducing interfacial tension are selected to test emulsification property and research emulsion stability of oil emulsion. The experiment shows that the emulsion stability of surfactant not only depends on the ability of reducing interfacial tension, but also is related to the intensity of oil and water interface and the viscosity of emulsion. CDEA emulsion has the advantages of stronger interface film, higher viscosity and smaller droplets diameter, accordingly, its emulsion stability is better. Dilational viscoelasticity test shows that having larger dilational modulus and stronger interface film, emulsion is more stable. Core displacement test shows that, for medium permeability core of 100×10-3μm2, the surfactant mainly uses emulsification to expand swept volume and improve cleaning efficiency, however, for low permeability core of 10×10-3μm2, the surfactant mainly depends on reducing oil and water interfacial tension to improve recovery.

关 键 词：表面活性剂 界面张力 乳化稳定性 界面扩张黏弹 

分 类 号：TE357[石油与天然气工程—油气田开发工程]