东辛原油组分-地层水界面扩张流变研究

从东辛原油中分离得到饱和分、芳香分、胶质、沥青质以及酸性组分，通过滴外形分析方法研究了各原油组分模拟油与地层水问的界面张力及界面扩张流变性质。结果表明，各类活性组分都具有界面活性，酯类组分的水解使得饱和分在高浓度时降低界面张力能力较强；扩张弹性随质量分数增大通过一个极大值，其高低顺序为：饱和分〉芳香分≈沥青质〉胶质≈酸性组分；饱和分中蜡组分在高浓度时以蜡晶形式析出，大大增强界面膜强度，造成较高的弹性，同时界面反应过程导致其较高的黏性。

Interracial Dilational Rheology of Dongxin Crude Oil Fractions-Formation Water

The crude oil fractions （saturates, aromatics, resins and asphaltenes） were obtained by classic SARA method. The acidic components were extracted from Dongxin crude oil by using NaOH/EtOH mixed solution. The interracial tension and dilational theological properties of all crude oil components were investigated at the kerosene-water interface by means of oscillating drop method. The results show that all crude oil components have interracial active and can reduce the interracial tension, and saturates can reduce interracial tension dramatically at high bulk concentration due to the hydrolysis of esters. Their interracial dilational elasticity passes through a maximum with increasing bulk concentration. The order of maximum values of elasticityis saturates〉 aromatics≈ asphaltenes〉acidic components≈ resins. Wax precipitates from saturatesat high concentration,which greatly enhances the strength of interracial film and provides high value of elasticity, and interracial reaction results in high value of viscosity.