界面张力弛豫法研究胜利原油活性组分与疏水缔合聚合物间相互作用

利用界面张力弛豫法研究了现场用疏水改性聚丙烯酰胺(HMPAM)在油-水体系中的界面扩张流变性质。采用溶剂萃取法和碱醇溶液萃取法对胜利原油进行分离，得到沥青质组分和酸性组分，测定了它们在油-水体系中对HMPAM界面扩张流变性质的影响。结果表明，在油-水体系中，HMPAM分子间通过疏水作用在油-水界面上形成网络结构，造成界面膜弹性随其浓度增加呈指数增大；原油酸性组分分子与HMPAM的疏水部分相互作用，阻碍界面网络结构的形成，大大降低了界面膜的弹性和黏性；沥青质分子尺寸较大，对界面膜影响较小。

Interactions Between Active Fractions of Shengli Crude Oil and Hydrophobically Modified Polyacrylamide Studied by Interfacial Tension Relaxation Measurements

The dilational rheological properties of hydrophobically modified polyacrylamide (HMPAM) in oil-water system were investigated by interfacial tension relaxation method. The acidic component fraction and asphaltene fraction were extracted from Shengli crude oil by using NaOH/EtOH solution and solvent extraction, respectively. The influences of acidic component and asphaltene on the dilational rheological behavior of HMPAM in oil-water system were expounded. The experimental results showed that the elasticity of interfacial film increased exponentially with the increase of HMPAM concentration in oil-water system due to the formation of interfacial net structure by hydrophobic interactions in HMPAM molecules. The acidic component molecules will hinder the formation of interfacial net structure by hydrophobic interactions between acidic molecules and HMPAM molecules, resulting in the decrease of the elasticity and viscosity of interfacial film in oil-water system, while asphaltene has little effect on the interfacial film due to its relatively larger molecular size.