基于原油物性定量表征的油包水乳状液黏度预测模型

Viscosity Prediction Model for Water-in-oil Emulsion Based on Quantitative Characterization of Crude Oil Physical Properties

罗海军 文江波 宋 扬 王志华

LUO Haijun WEN Jiangbo SONG Yang WANG Zhihua

准确预测原油乳状液的黏度对于油水混输管道的设计和运行具有重要意义。将8种不同物性的原油制备 成油包水乳状液，通过流变仪对乳状液的黏度特性进行测定，研究了温度、含水率及剪切速率对油包水乳状液表 观黏度的影响。以实验数据为基础，并对原油物性进行定量表征，建立了适用于不同原油、不同剪切条件的油包 水乳状液黏度预测模型。结果表明，油包水乳状液的表观黏度随温度的升高而减小，随含水率的增加而增大，随 剪切速率的增加而减小；具有剪切稀释性，可采用幂率模型来描述油包水乳状液的流变特性。随着含水率上升， 油包水乳状液的稠度系数（K）逐渐增大，而流变特性指数（n）逐渐减小；随着温度升高，K逐渐减小，而n逐渐增 大。油包水乳状液黏度预测模型的最佳适用条件为：乳状液体积含水率0.30～0.60、温度30～60 ℃、乳状液黏度 10～2000 mPa·s。该模型计算黏度值与实测值之间的平均相对偏差为8.1%，预测效果良好。

Accurate prediction of the viscosity of crude oil emulsion is of great significance for the design and operation of oil-water mixed pipeline. Eight kinds of crude oils with different physical properties were used to prepare water-in-oil（W/O）emulsions. The viscosity characteristics of W/O emulsions were measured by rheometer. The effects of temperature，water cut of emulsion and shear rate on the apparent viscosity of W/O emulsions were studied. Based on the experimental data and the quantitative characterization of crude oil physical properties，the viscosity prediction model of W/O emulsion suitable for different crude oils and different shear conditions was established. The results showed that the apparent viscosity of W/O emulsion decreased with increasing temperature，increased with increasing water cut，and decreased with increasing shear rate，showing the property of shear thinning. The power law model could be used to describe the rheological properties of W/O emulsion. With increasing water cut of emulsion，the consistency coefficient K of W/O emulsion increased gradually，while the rheological property index n decreased gradually. With the increase of temperature，K decreased gradually，while n increased gradually. The best applicable condition for the viscosity prediction model of W/O emulsion was obtained as follows：water cut of emulsion ranging from 0.30 to 0.60，temperature ranging from 30 ℃ to 60 ℃，and emulsion viscosity ranging from 10 mPa·s to 2000 mPa·s. The average relative deviation between calculated viscosity value and measured value of the model was 8.1%，showing good prediction effect.

10.19346/j.cnki.1000-4092.2023.02.023