复合驱体系化学剂对原油活性组分界面扩张性质的影响

Effect of EOR chemicals on interfacial dilational properties of active constituents in crude oil

采用小幅低频振荡方法,研究了复合驱体系化学剂如盐、碱、聚合物以及表面活性剂对原油活性组分界面膜扩张黏弹性质的影响和界面扩张模量及相角的变化趋势。研究结果表明,复合驱体系化学剂对原油活性组分界面膜的性质均有一定影响:盐通过改变活性物质在界面上的吸附而影响界面扩张黏弹性质;聚合物能增大低相对分子量活性组分的界面扩张黏度,对高相对分子量活性组分的影响不明显;碱与原油活性组分反应,使扩张黏度明显变化,界面膜的弹性大大增强;表面活性剂能将高相对分子量活性组分从界面上顶替下来,使界面体现为近似单独表面活性剂的性质,而对于低相对分子量活性组分,界面表现为活性组分与表面活性剂混合吸附膜的性质;扩张模量的相角在高工作频率下出现负值。探讨了表观负相角产生的机理。

The effect of chemicals in EOR system, such as salt, polymer, alkali and surfactant, on interfacial dilatational viscoelas-ticity behaviors of decane-water interfaces formed of surface active constituents, which were distilled by supercritical fluid extraction and fractionation (SFEF) method from Iranian heavy oil, were investigated by the methods of sinusoidal oscillation and interfacial relaxation, suggesting that with the addition of polymer or alkali, the dilatational properties of interfacial film containing crude oil constituents changed obviously and the phase angles were negative in some cases. The mechanism responsible for negative phase angle is also discussed.