含水量和剪切速率对含蜡油包水乳状液水合物形成和聚集的影响

IF 3.4 2区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY
Wuchang Wang*, Tianhong Xu, Xin Geng, Guangchun Song, Zheng Xu, Minghui Yao, Yuchuan Qian and Yuxing Li*, 
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引用次数: 0

摘要

海底管道是海上油气运输的关键环节。蜡和水合物可能同时形成和聚集,增加体系粘度并造成堵塞。利用高压反应器,研究了含水率和剪切速率对含蜡水包油乳液型天然气水合物形成和聚集的影响。实验结果表明,水含量的增加促进了水合物在壁面的生长,增强了水合物成核,从而增加了水合物的形成。然而,蜡会削弱这种效果。含水量的增加还会促进水合物颗粒聚集,增加水合物颗粒的初始粒径和浆体的粘度,从而降低水合物浆体的流动性。然而,蜡可以抑制水合物颗粒的聚集。增加剪切速率加速了水合物膜的形成和壁面成核,增加了水合物产量。然而,剪切作用破坏了液态蜡的空间网络结构,显著提高了成核速率。剪切速率的提高促进了水合物颗粒的聚集,从而增加了水合物浆体的粘度。同时,蜡的存在进一步降低了体系的流动性,从而加剧了这种影响。最后,提出了含蜡水包油体系中水合物在含水量和剪切速率影响下的生长和聚集机理,为管道流动安全保障提供参考和支持。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Effect of Water Content and Shear Rate on Wax-Containing Water-in-Oil Emulsion Hydrate Formation and Aggregation

Effect of Water Content and Shear Rate on Wax-Containing Water-in-Oil Emulsion Hydrate Formation and Aggregation

Subsea pipelines are critical links in the transportation of offshore oil and gas. Wax and hydrates may form and aggregate simultaneously, increasing the system viscosity and causing blockages. Using a high-pressure reactor, we investigated the effects of the water content and shear rate on the formation and aggregation of wax-containing oil-in-water emulsion natural gas hydrates. Experimental results showed that an increase in the water content promotes hydrate growth on the wall surface and enhances hydrate nucleation, thereby increasing hydrate formation. However, wax weakens this effect. An increase in the water content also promotes hydrate particle aggregation, increasing the initial particle size of hydrate particles and the viscosity of the slurry, thereby reducing the flowability of the hydrate slurry. However, wax can inhibit hydrate particle aggregation. Increasing the shear rate accelerates the formation of hydrate films and nucleation at the wall surface, increasing hydrate production. However, shear action disrupts the spatial network structure of liquid wax, significantly increasing the nucleation rate. Elevated shear rates promote the aggregation of hydrate particles, thereby increasing the viscosity of the hydrate slurry. Meanwhile, the presence of wax compounds this effect by further reducing the system’s flowability. Finally, the mechanism of hydrate growth and aggregation in wax-containing oil-in-water systems under the influence of water content and shear rate is proposed, providing reference and support for pipeline flow safety assurance.

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来源期刊
Crystal Growth & Design
Crystal Growth & Design 化学-材料科学:综合
CiteScore
6.30
自引率
10.50%
发文量
650
审稿时长
1.9 months
期刊介绍: The aim of Crystal Growth & Design is to stimulate crossfertilization of knowledge among scientists and engineers working in the fields of crystal growth, crystal engineering, and the industrial application of crystalline materials. Crystal Growth & Design publishes theoretical and experimental studies of the physical, chemical, and biological phenomena and processes related to the design, growth, and application of crystalline materials. Synergistic approaches originating from different disciplines and technologies and integrating the fields of crystal growth, crystal engineering, intermolecular interactions, and industrial application are encouraged.
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