一种超稠油模拟油的油水界面扩张黏弹性研究

Studies on the Dilatational Viscoelasticity of the Interface for Simulated superheavy oil

采用三组分分离法,从一种超稠油中分离出胶质、沥青质和抽余油,配制成不同浓度的模拟油。用OCA20界面张力仪/界面黏弹性仪考察了该种超稠油模拟油的动态界面扩张模量随扩张频率和活性组分浓度的变化规律,研究了从超稠油中分离出的胶质、沥青质和抽余油对模拟油油水界面张力及界面扩张性质的影响。结果表明,当各组分在模拟油中的浓度相同时,抽余油的界面张力最小,胶质的最大,沥青质的居中;含有不同活性组分模拟油的动态界面扩张模量均随扩张频率的升高而增大,胶质模拟油的动态界面扩张模量随活性组分浓度的增大而增大,而沥青质、抽余油模拟油的却先增加后降低;当活性组分浓度为1～4 g/L时,模拟油界面扩张模量的大小顺序为:沥青质>胶质>抽余油。

Resin,asphaltene and raffinate were separated from a kind of superheavy crude oil by three-component separation method,and were prepared to simulated oil with different concentration.The dilatational viscoelasticity of the interface between simulated oil and water was studied by using OCA20 interfacial tension instrument/interface viscoelasticity instrument.The dependence of dilatational modulus on dilatational frequency and concentration of active ingredients was inspected.The influences of resin,asphaltene and raffinate seperated from superheavy oil on dilatation of oil-water interface were also studied.The results showed that three active ingredients were arranged according to the interfacial tension in following order： resinasphalteneraffinate with same concentration in stimulated oil,and their dilatational modulus increased with increasing dilatational frequency.When the concentration of active ingredients in simulated oil increased,the dynamic interfacial dilatational modulus of resin also increased,but that of asphaltene and raffinate increased initially and then decreased.When the concentration of active ingredients in simulated oil was of 1—4 g/L,they were arranged according to the dilatational modulus in following order： asphalteneresinraffinate.