Wax deposition modeling of oil/gas stratified smooth pipe flow

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• 作者：Jimiao Duan ; Huishu Liu ; Jinfa Guan ; Weixing Hua ; Guangwei Jiao and Jing Gong
• 刊名：AIChE Journal
• 出版年：2016
• 出版时间：July 2016
• 年：2016
• 卷：62
• 期：7
• 页码：2550-2562
• 全文大小：550K
• ISSN：1547-5905

文摘

Wax deposition modeling is complicated under oil/gas two-phase pipe flow and therefore remains poorly understood. One-dimensional empirical heat and mass transfer correlations are unreliably for deposition modeling in stratified flow, due to non-uniform deposit across the pipe circumference. A mathematical model has been developed to predict the deposit thickness and the wax fraction of deposit in oil/gas stratified pipe flow using a unidirectional flow analysis of non-isothermal hydrodynamics and heat/mass transfer. The predictions for wax deposition are found to compare satisfactorily with experimental data with three different oils for single phase and oil/gas stratified pipe flow. In particular, the reason that the deposit forming a crescent shape at the cross section of pipe observed in different experiments is revealed, based on the non-uniform circumferential distributions of two most important parameters for the wax deposition, diffusivity at oil–deposit interface, and the solubility gradient at the oil–deposit interface at different time.