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Quantitative characterization of the blockage effect from dispersed phase on wax molecular diffusion in water-in-oil emulsion
Journal of Petroleum Science and Engineering ( IF 5.168 ) Pub Date : 2020-10-15 , DOI: 10.1016/j.petrol.2020.108012
Si Li , Kaifeng Fan

Molecular diffusion is the main mechanism of wax deposition, whereas the dispersed water droplets influence the wax diffusivity in water-in-oil (w/o) emulsion by restricting the diffusion path. In the present work, geometric analysis method was used to analyze the blockage effect from dispersed phase on the restricted diffusion path of wax molecules in w/o emulsion, and a correlation was proposed relating the blockage effect with water fraction, dispersed degree and nonuniformity of dispersed phase in real emulsions. Firstly, regarding water droplets as spherical particles with uniform size and arrangement pattern, the average tortuosity of different wax diffusion paths was deduced in two-dimensional (2D) and three-dimensional (3D) ideal conditions. The results showed that the blockage degree was enhanced with the increase in water fraction. Moreover, the droplet size distribution of different w/o emulsions was investigated by microscopic observation and a set of microstructure characterization parameters were summarized in statistics. A 3D microstructure model of real emulsion was established to derive the tortuosity, taking the effect of droplet size distribution into consideration. The blockage effect was enhanced by the increase in the dispersity and polydispersity of water droplets, but this influence was not significant and water fraction was still the main influencing factor. On this basis, a correlation of blockage coefficient with water fraction, number-averaged diameter and polydispersity was proposed and validated using the 1H/19F-NMR test results in literature with the average relative error being 3.17%. This will provide a support to the revealing of wax diffusion mechanism in w/o emulsions and the wax deposition prediction of multiphase flow pipelines.



中文翻译:

分散相对油包水乳液中蜡分子扩散的阻滞作用的定量表征

分子扩散是蜡沉积的主要机理,而分散的水滴则通过限制扩散路径来影响油包水(w / o)乳液中蜡的扩散性。在本文中,采用几何分析方法分析了分散相对w / o乳状液中蜡分子受限制的扩散路径的阻塞效应,并提出了阻塞效应与水份,分散度和不均匀性之间的关系。分散在实际乳液中的相。首先,将水滴视为具有均匀尺寸和排列图案的球形颗粒,在二维(2D)和三维(3D)理想条件下推导了不同蜡扩散路径的平均曲折度。结果表明,随着水含量的增加,堵塞程度增加。此外,通过显微镜观察研究了不同w / o乳液的液滴尺寸分布,并在统计学中总结了一组微观结构表征参数。考虑到液滴尺寸分布的影响,建立了真实乳液的3D微结构模型以得出曲折度。水滴的分散性和多分散性的增加增强了堵塞效果,但是这种影响并不显着,并且水份仍然是主要的影响因素。在此基础上,提出了堵塞系数与水份,数均直径和多分散度的相关性,并使用 通过显微镜观察研究了不同w / o乳液的液滴粒径分布,并在统计学中总结了一组微观结构表征参数。考虑到液滴尺寸分布的影响,建立了真实乳液的3D微结构模型以得出曲折度。水滴的分散性和多分散性的增加增强了堵塞效果,但是这种影响并不显着,并且水份仍然是主要的影响因素。在此基础上,提出了堵塞系数与水份,数均直径和多分散度的相关性,并使用 通过显微镜观察研究了不同w / o乳液的液滴粒径分布,并在统计学中总结了一组微观结构表征参数。考虑到液滴尺寸分布的影响,建立了真实乳液的3D微结构模型以得出曲折度。水滴的分散性和多分散性的增加增强了堵塞效果,但是这种影响并不显着,并且水份仍然是主要的影响因素。在此基础上,提出了堵塞系数与水份,数均直径和多分散度的相关性,并使用 考虑到液滴尺寸分布的影响。水滴的分散性和多分散性的增加增强了堵塞效果,但是这种影响并不显着,并且水份仍然是主要的影响因素。在此基础上,提出了堵塞系数与水份,数均直径和多分散度的相关性,并使用 考虑到液滴尺寸分布的影响。水滴的分散性和多分散性的增加增强了堵塞效果,但是这种影响并不显着,并且水份仍然是主要的影响因素。在此基础上,提出了堵塞系数与水份,数均直径和多分散度的相关性,并使用1 H / 19 F-NMR测试结果为文献报道,平均相对误差为3.17%。这将为揭示w / o乳液中蜡的扩散机理和多相流管道的蜡沉积预测提供支持。

更新日期:2020-10-16
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