Micro-mechanism analysis of the rheological properties of water-in-waxy-crude-oil emulsion under pipe flow
Micro-mechanism analysis of the rheological properties of water-in-waxy-crude-oil emulsion under pipe flow
复制标题
管流下含蜡原油包水乳状液流变特性微观机理分析
DOI：
10.1080/01932691.2020.1823231
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发表时间：
2020-09
影响因子：
2.2
通讯作者：
Rongbin Li
中科院分区：
文献类型：
--
作者：
Kaifeng Fan;Si Li;Rongbin Li
摘要 在流动回路装置中进行了不同含水量的含蜡原油包水乳状液的流动实验。定量分析了管流过程中乳液的流变特性和微观分布随时间的实时变化。研究发现，由于剪切效应，乳液的乳化效果增强，导致凝胶点和粘度随着时间的推移而增加。对于含水量为 10%、20% 和 30% 的乳液，凝胶点的平均增量分别约为 1.5°C、1.7°C 和 1.9°C。在0.5小时至18小时的实验期间，乳液温度下测得的平均粘度增加了31%。采用数均直径(d 1,0)、比表面积(SA)和多分散性(PDI)等表征参数从液滴尺寸、分散性和不均匀性的角度反映乳液的微观结构。随着管流的继续，水滴变得更小并均匀分散。随着乳液流经管道，吉布斯自由能增大，这主要是由管壁剪切引起的。当乳液的含水量从 10% 变化到 30% 时，范德华力从 -0.0678 × 10−21 J 增加到 -1.7657 × 10−21 J。水滴可以通过提供必要的核表面来促进蜡晶体的结晶。此外，水滴和蜡晶体的共存产生协同效应，可以增加乳液体系的总能量和结构强度。图解摘要
Abstract Flowing experiments with different water contents in water-in-waxy-crude-oil emulsions were performed in a flow loop apparatus. The real-time variations of rheological properties and microscopic distributions of the emulsions over time during pipe flow were quantitatively analyzed. It was found that the emulsification effect of the emulsion is enhanced due to shear effect, resulting in an increase of gel point and viscosity over time. The average increments in the gel point are approximately 1.5 °C, 1.7 °C and 1.9 °C for the emulsions with water contents of 10%, 20% and 30%, respectively. During the experimental period from 0.5 h to 18 h, the average viscosities measured at the emulsion temperature increase by 31%. Characterization parameters of number-averaged diameter (d 1,0), specific surface area (SA) and polydispersity (PDI) were applied to reflect the microstructure of emulsions from the perspectives of droplet size, dispersity and nonuniformity. The water droplets become smaller and uniformly dispersed as the pipe flow goes on. The Gibbs free energy increases as the emulsion flows through the pipe, which is mainly caused by the shear of the pipe wall. The van der Waals force increases from −0.0678 × 10−21 J to −1.7657 × 10−21 J as the emulsion’s water content changes from 10% to 30%. The water droplets can promote crystallization of wax crystals by offering the necessary nucleus surface. Furthermore, the coexistence of water droplets and wax crystals creates a synergistic effect, which can augment the total energy and structural strength of the emulsion system. Graphical Abstract
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