乙醇胺与胜坨油田坨28区块原油活性组分相互作用对动态界面张力的影响

Effect of the interaction between ethanolamine and Tuo 28 block crude oil fractions on dynamic interfacial tensions

为明确胜坨油田坨28区块原油中活性组分与有机碱乙醇胺间的相互作用对动态界面张力的影响,采用SARA四组分分离方法对坨28区块原油进行分离,获得饱和分、芳香分、胶质和沥青质等组分;利用醇碱萃取法获得酸性组分;通过旋转滴界面张力仪测定了乙醇胺与坨28区块原油活性组分模拟油间的动态界面张力。研究结果表明:酸性组分是原油的主要活性组分,其质量分数及结构对有机碱与原油间界面张力的行为具有关键性影响,体系动态界面张力的最低值可达10-2m N/m数量级;酸性组分质量分数越大,低界面张力维持时间越长。对于坨28区块原油,与乙醇胺作用的难易顺序为:酸性组分最强,胶质次之,沥青质、饱和分和芳香分与之作用比较微弱。

In order to expound the influence of interactions between organic alkali ethanolamine and crude oil fractions in Shengtuo 28 block crude oil on the interfacial tension, the crude oil fractions(saturates, aromatics, resins and asphaltenes) were obtained by classic SARA method. The acidic components were extracted from Tuo 28 block crude oil by using Na OH/Et OH mixed solution. The dynamic interfacial tensions between all crude oil fractions and ethanolamine were investigated by means of Spinning Drop method. The experimental results show that the key factors of reducing interfacial tension between organic alkali and model oils are the content and structure of petroleum acids. The minimum value of dynamic interfacial tension can reach 10-2m N/m order of magnitude. The higher the content of petroleum acid is, the longer the low transient value of interfacial tension keeps. The order for the ability of Tuo 28 crude oil fractions to react with ethanolamine is: acidic components are the strongest; resins are next; asphaltenes, aromatics, and saturates are the weakest.