多孔介质中油膜驱替特性的实验模拟  

Experimental simulation on displacement of oil film in porous media

作　　者：张立娟[1] 岳湘安[1] 孙盈盈[2] 

机构地区：[1]中国石油大学(北京)石油工程学院,北京102249 [2]中国石油勘探开发研究院,北京100083

出　　处：《油气地质与采收率》2015年第6期80-84,共5页Petroleum Geology and Recovery Efficiency

基　　金：国家自然科学青年基金项目"油水在油藏孔喉中的流动和乳化机理研究"(50804051);国家科技重大专项"低渗油藏水驱后提高采收率技术"(2011ZX05009-004);中国石油大学(北京)优秀青年教师研究项目"泡沫驱在特低渗透油藏适应性与调驱机理研究"(2462015YQ0209)

摘　　要：利用现有的微观模型难以模拟和量化驱油剂对油膜类残余油的驱替特性,为此,建立一种研究多孔介质中油膜驱替特性的实验模拟系统,通过该系统开展了几种单一驱油体系和复合驱油体系对油膜的驱替实验,得到油膜驱替效率的量化结果.在相同的流动条件下,具有低界面张力、强乳化能力和改变壁面润湿性能力的表面活性剂与强碱复合驱油体系对油膜的驱替效率最高,为74.32%;具有低界面张力和较强乳化能力的表面活性剂溶液及其与弱碱或盐的复合驱油体系,对油膜的驱替效率为57.49%~71.98%;具有改变壁面湿润性能力的强碱和弱碱溶液,对油膜的驱替效率分别为56.09%和10.14%;质量分数为0.2%的NaCl溶液3种驱油性能均不显著,对油膜的驱替效率最低.研究结果表明,降低界面张力、增强乳化能力和改变壁面润湿性有利于提高对油膜的驱替效率.It is difficult for current existing micro-models to simulate and quantify displacement of residual oil film. A laboratory system was developed to model displacement of oil film in porous media,and flooding experiments on oil film were conducted with several single and composite oil displacement agents. Quantification results of displacement efficiency of oil film were presented. At the same flow conditions,the composite system of surfactant/strong alkaline has the highest displacement efficiency of 74.32% with low interfacial intension,strong emulsification and wettability change ability. Surfactant solution and its composite system consisting of weak alkaline or salt have low interfacial intension and strong emulsification and their displacement efficiencies are between 57.49% and 71.98%. The displacement efficiencies of strong base and weak base solution capable of wettability change are 56.09% and 10.14% respectively. However,the displacement efficiency of salt solution with mass fraction of 0.2% is the lowest without the above three displacement properties. Research results show that higher oil film displacement efficiency can be obtained by chemical agents with lower interfacial tension,strong emulsification and wettability change ability.

关 键 词：化学驱 驱替效率 润湿性 界面张力 乳化 

分 类 号：TE357.43[石油与天然气工程—油气田开发工程]