稠油体系的微观结构及流变性分析  

Study on microstructure and rheology of heavy oil

作　　者：朱静[1] 李传宪[1] 辛培刚[2] 许东[2] 

机构地区：[1]中国石油大学(华东)储运与建筑工程学院,山东青岛266555 [2]海洋石油工程(青岛)有限公司,山东青岛266555

出　　处：《西安石油大学学报（自然科学版）》2012年第2期54-57,120,共4页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：国家自然科学基金项目(编号:50904077)资助

摘　　要：论述了稠油的胶体结构性质.沥青质胶束在体系各种力作用下通过自缔合作用,可形成不同层次的超分子结构,使稠油成为一种多分散的胶体体系.利用透射电子显微镜观察了稠油内部胶团结构的形态,分析了胶质-沥青质的存在状态.利用RS75旋转黏度计测试并分析了稠油的黏温特性及流变特性.结果表明:黏温曲线在测量区间内(20～80℃)较好地符合Arrhenius方程,低温下的活化能高于高温下的活化能;在较低温度下,稠油黏度具有剪切稀释性,并且随压力增大而增大,这是低温下胶质、沥青质结构增强及少量蜡晶析出共同作用的结果.Asphaltene micelle can form different extra-molecular structures in heavy oil by self-association,which makes heavy oil become a poly-disperse colloid system.The morphology of the micelles in heavy oil is observed using transmission electron microscopy(TEM,and the existing state of colloid-asphaltene in heavy oil is analyzed.The viscosity-temperature characteristics and rheologic behavior of heavy oil are tested and analyzed.The results show that the viscosity-temperature characteristics are accord with Arrhenius equation in the range of 80~20 ℃,and the activation energy of the heavy oil at low temperature is higher than that at high temperature;and that the heavy oil has shear thinning behavior,and the higher the pressure,the more significant the shear thinning behavior,which is caused by the enhancement of asphaltene micelle structure and the precipitation of wax at low temperature.

关 键 词：稠油 微观结构 黏温特性 流变性 

分 类 号：TE266.5[石油与天然气工程—油气井工程]