数字图像分析技术研究乳状液的微观结构

Emulsion microstructure from digital image analysis technique

在热力采油尤其是复合驱作业中,高黏度乳状液的形成、产出及其处理有非常重要的影响。近年来,在大庆、胜利等油田进行的三元复合驱矿场先导性试验中,乳化是用化学法提高采收率过程中普遍存在的现象。微观液滴结构及其分布是表征乳状液性质的重要基础参数,采用数字图像分析技术,研究具有显著非牛顿流体特征的乳状液体系特殊的渗流特征与其微观的液滴结构的关系,初步结论如下:①微观液滴结构与乳状液的流变学性质密切相关;②乳状液在多孔介质中的渗流条件(如流速)影响着乳状液的液滴形态与分布和体系的黏度、黏弹性等。

The fonnation. production and handling of highly viscous petroleum-emulsion are significant problems in the operation of many heavy oil thermal stimulation and EOR projects. During the 1980s to 1990s, the ASP combination flooding for EOR studies were conducted in Daqing, Shengli and Karamay Oilfield. As is now well known that most enhanced oil recovery processes involve the fonnation and flow of emulsion and this emulsion produced from ASP flooding was strongly non-Newtonian. The digital image analysis technique and optical microscopy were used to study the non-Newtonian emulsion characterization by calculating the droplet size distribution of the dispersed phase in the pictures. The rheological properties were measured using a concentric cylinder rotary rheometer. Results show that the emulsion Theological behavior is as a function of composition, droplet size distribution, and the rate through porous media.