Effects of wax on the formation of methane hydrate in oil-dominate systems: Experiments and molecular dynamics simulations
摘要：Hydrate formation and wax deposition in underwater multiphase pipelines have become two vital problems affecting the flow assurance safety. Experiments and molecular dynamics (MD) simulations were performed to investigate the effect of wax crystals on hydrate nucleation and growth. Our experimental results showed that wax crystals had an inhibitory effect on hydrate growth, but played a dual role in methane hydrate nucleation (promotion and inhibition). The addition of wax could decrease mass transfer coefficient of methane by increasing viscosity of oil phase, which lower methane supply from the oil bulk phase to the oil-water interface. The simulation results revealed that the wax crystals at the interface influenced the mass transfer of methane molecules instead of providing heterogeneous nucleation sites. Small wax crystal adjacent to the oil-water interface accelerated methane supersaturation dissolution and restricted gas diffusion in the aqueous phase because of adsorption to methane, which promoted hydrate nucleation and shifted the nucleation position toward the oil-water interface. While the large wax crystal could effectively block the methane mass transfer from oil phase to aqueous phase by covering the oil-water surface, which reduced the concentration of methane in the aqueous phase and prolonged the induction time of hydrate formation. These results of this work would provide a better understanding of the interaction mechanism between hydrate and wax.
关键字：Methane hydrate; Wax; Hydrate formation; Molecular dynamics simulation
ISSN号：0016-2361
卷、期、页：卷: 357子辑: A
发表日期：2024-02-01
影响因子：0.000000
期刊分区（SCI为中科院分区）：一区
收录情况：SCI（科学引文索引印刷版）,SCIE（科学引文索引网络版）
发表期刊名称：FUEL
通讯作者：王丽敏,郑鑫,黄兴
第一作者：肖朋,刘蓓,李智,陈光进,孙长宇
论文类型：期刊论文
论文概要：王丽敏,郑鑫,肖朋,黄兴,刘蓓,李智,陈光进,孙长宇，Effects of wax on the formation of methane hydrate in oil-dominate systems: Experiments and molecular dynamics simulations，FUEL，2024，卷: 357子辑: A
论文题目：Effects of wax on the formation of methane hydrate in oil-dominate systems: Experiments and molecular dynamics simulations