稠油水包油型乳状液的黏度和稳定性变化规律

Changing rules of stability and viscosity of heavy oil-in-water emulsion

稠油O/W乳状液的性质复杂,其静态稳定性和黏度是选择确定输送工艺的重要指标。使用两种稠油和3种乳化剂成功地在高温及高矿化度等条件下,制备出O/W乳状液,确定了乳状液的制备条件,筛选出适合不同条件的乳化剂。通过测量O/W乳状液在不同制备条件下的黏度和析水率随时间的变化,分析各因素对乳状液性质的影响规律,得到了O/W乳状液黏度和稳定性随含水率、搅拌条件、温度、矿化度以及p H值的变化规律,完善了O/W乳状液黏度的预测模型。

The heavy oil O/W emulsions have extremely complicated properties, among which static stability and viscosity are key parameters in selection of available transportation technologies. In this study, O/W emulsions are prepared successfully under high temperature and high salinity conditions by using two kinds of heavy oil and three kinds of emulsifiers to clarify conditions for preparation of emulsions and to identify emulsifiers applicable for different conditions. By studying correlation between the time and changes in viscosity and water extraction rate of O/W emulsion under different preparation conditions, patterns in changes of viscosity and stability of O/W with water contents, stirring conditions, temperatures, salinity and p H can be highlighted to improve the model for prediction of viscosity of O/W emulsions.