An investigation on gas hydrate formation and slurry viscosity in the presence of wax crystals

Clarifying the interaction effect between hydrate and wax is of great significance to guarantee operation safety in deep water petroleum fields. Experiments in a high‐pressure hydrate slurry rheological measurement system were carried out to investigate hydrate formation and slurry viscosity in the...

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Bibliographic Details
Published in:AIChE journal 2018-09, Vol.64 (9), p.3502-3518
Main Authors: Shi, Bo‐Hui, Chai, Shuai, Ding, Lin, Chen, Yu‐Chuan, Liu, Yang, Song, Shang‐Fei, Yao, Hai‐Yuan, Wu, Hai‐Hao, Wang, Wei, Gong, Jing
Format: Article
Language:English
Subjects:
Breakage
Crystals
Deep water
Growth rate
hydrate formation
hydrate slurry viscosity
hydrates
induction time
Initial pressure
Nucleation
Organic chemistry
Pressure
Rheological properties
Sedimentation & deposition
Slurries
Viscosity
Water drops
wax crystals
Waxes
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Summary:Clarifying the interaction effect between hydrate and wax is of great significance to guarantee operation safety in deep water petroleum fields. Experiments in a high‐pressure hydrate slurry rheological measurement system were carried out to investigate hydrate formation and slurry viscosity in the presence of wax crystals. Results indicate that the presence of wax crystals can prolong hydrate nucleation induction time, and its influence on hydrate growth depends on multiple factors. Higher stirring rate can obviously promote hydrate growth rate, while its influence on hydrate nucleation induction time is complicated. Higher initial pressure will promote hydrate formation. Gas hydrate slurry shows a shear‐thinning behavior, and slurry viscosity increases with the increase of wax content and initial pressure. A semiempirical viscosity model showing a well‐fitting is established for hydrate slurry with wax crystals by considering the aggregation and breakage of hydrate particles, wax crystals, and water droplets. © 2018 American Institute of Chemical Engineers AIChE J, 64: 3502–3518, 2018
ISSN:0001-1541
1547-5905
DOI:10.1002/aic.16192