中文摘要：

含水稠油加入水基降黏剂后常以油水悬浮液或乳状液形式存在，这种不均匀体系给流变性测量带来了困难，搅拌法是解决该问题的常用方法。目前评价水基降黏剂通过测试不同温度下油水悬浮液黏度来评价其效果，该方法不能模拟实际管流剪切对油水悬浮液的影响，其效果过于乐观，本文提出了模拟实际管道降温和剪切的水基降黏剂评价方法，该方法模拟过程与实际管输过程一致，可以对稠油水基降黏剂的降黏效果进行准确评价。

英文摘要：

The non-uniform solution exhibited as water-in-oil suspension or emulsion produce for the admixture of oil and water-based viscosity depressant, which brings some potential difficulties to the measurement of viscosity and thus evaluation of viscosity depressants. Agitating method is employed to solve this problem at present. However, this method can＇t well mimic the effect of pipe flow shearing on rheologieal behavior of water-oil blend due to the difference in agitating strength from limitation of experimental design. As a result, the evaluation result from this method is generally too far optimistic. For this reason, an improved evaluation method for the performance of water-based viscosity depressant was proposed, which can simulate the shear and thermal conditions tightly as in a real field. The experiment results reveal that the method has a better performance and provide a solid basis for evaluation for water-based viscosity depressants.