大庆原油中活性物质对界面张力的影响  

Influence of active substance on interfacial tension in crude oil

作　　者：刘立伟[1] 侯吉瑞[2] 岳湘安[2] 

机构地区：[1]中海油研究总院海洋石油高效开发国家重点实验室,北京100027 [2]中国石油大学(北京)石油工程教育部重点实验室,北京102249

出　　处：《油气地质与采收率》2011年第2期58-61,114-115,共4页Petroleum Geology and Recovery Efficiency

基　　金：国家重点基础研究发展计划"973"计划专题"新型驱油体系驱油机理研究"(2005CB221303)

摘　　要：通过预接触时间、红外谱图分析等手段研究了原油中活性物质对复合体系界面张力的影响。结果表明,随着预接触时间的增加,原油与复合体系的界面张力最低值逐渐上升,最终与平衡值相同;而直馏煤油与复合体系的界面张力最低值和平衡值几乎相等,且不受接触时间影响;原油中的活性物质由油水界面向水相扩散并最终达到平衡,并且界面张力在达到最低值前后均与t-1/2(t为实验时间)成线性关系,符合扩散规律;对油相和水相进行红外谱图和质谱分析后发现,在与碱接触后,油相的活性物质减少,水相中活性物质增加,验证了原油中的活性物质对降低界面张力起到重要作用。The influence of active substance on the interfacial tension of the system of NaCl/alkali/heavy alkyl benzene sulfonate/ Daqing crude oil is studied herein by means of pre-contact time and infrared scan. The result of the experiment presents that active substance diffuses from oil-aqueous interface to aqueous phase and finally reaches the equilibrium in the system with the prolonging of the pre-contact time. At the same time, the value of the minimum IFT and the value of equilibrium IFT rise with the extension of the pre-contact time and have a linear relationship between IFT and t-1/2 when IFT value approaching the minimum and after the minimum, that is, the process is diffusion controlled. After having an analysis of infrared scan and mass analysis on the oil and aqueous phase, we propose that the content of active substance in the oil decreased and the content in the aqueous increased after alkali have a reaction with system. It is proved that the active substances in the oil play a very important role in the IFT decrease.

关 键 词：预接触时间 扩散作用 活性物质 碱 界面张力 三元复合驱 

分 类 号：TE357.43[石油与天然气工程—油气田开发工程]