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Settling and re-entrainment of wax particles in near-gelling systems
AIChE Journal ( IF 3.7 ) Pub Date : 2017-09-14 02:01:33 , DOI: 10.1002/aic.15948
Seetharaman Navaneetha Kannan 1 , Nagu Daraboina 1 , Rama Venkatesan 2 , Cem Sarica 1
Affiliation  

Under near-gelling conditions, the precipitated wax particles can settle down due to gravity and form a bed at the bottom of the pipeline. During restart, the settled waxy bed can increase the pressure drop significantly, and the necessity for pigging and/or addition of chemicals has to be determined to re-entrain settled wax particles. A laboratory-scale flow loop, first of its kind, has been built and used to understand the settling and re-entrainment behavior. The experimental results confirmed the settling of precipitated wax in a pipe under quiescent conditions when the oil temperature falls between wax appearance temperature and pour point. During restart, complete re-entrainment was attained after reaching a critical flow rate. Solid transport models were able to predict reasonably good results in agreement with experiments. This work emphasizes the importance of understanding the behavior of waxy crude oil during production shutdown and design appropriate startup strategies. © 2017 American Institute of Chemical Engineers AIChE J, 00: 000–000, 2017

中文翻译:

在近胶凝体系中沉淀和重新夹带蜡颗粒

在接近胶凝的条件下,沉淀的蜡颗粒会由于重力而沉降下来,并在管道底部形成床层。在重新启动期间,沉降的蜡状床会显着增加压降,并且必须确定清管和/或添加化学品的必要性以重新夹带沉降的蜡颗粒。已经建立了实验室规模的流动回路,并用于理解沉降和再夹带行为。实验结果证实,当油温在蜡的出现温度和倾点之间时,沉淀的蜡在静止条件下在管道中的沉降。在重新启动期间,达到临界流速后,完全重新夹带。固体运输模型能够与实验一致地预测合理的良好结果。这项工作强调了在生产停工期间了解蜡质原油的行为并设计适当的启动策略的重要性。©2017美国化学工程师学会AIChE J,00:000–000,2017年
更新日期:2017-09-14
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