Abstract The rheological behavior and start-up characteristic of heavy oil emulsions for shutdown pipeline have been studied. To illustrate the properties, we examined the relationship between start-up stress and apparent viscosity. The oil–water ratio, surfactant concentration, start-up temperature and constant shear rates on start-up maximum stress were investigated and a new start-up pressure model was established. The results indicate that start-up stress and apparent viscosity have a consistent change with time. Equilibrium shear stress could be used to predict start-up pressures. The calculated values were in good agreement with experiment ones, which the absolute relative error is less than 10.0%.

中文翻译：

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稠油及其乳液的流变行为

摘要 研究了用于停井管道的稠油乳液的流变行为和启动特性。为了说明这些特性，我们检查了启动应力和表观粘度之间的关系。研究了油水比、表面活性剂浓度、启动温度和恒定剪切速率对启动最大应力的影响，建立了新的启动压力模型。结果表明，启动应力和表观粘度随时间变化一致。平衡剪切应力可用于预测启动压力。计算值与实验值吻合较好，绝对相对误差小于10.0%。