Petroleum Science >2024,??Issue1:??- DOI: https://doi.org/10.1016/j.petsci.2023.08.027
New insights into the deposition of natural gas hydrate on pipeline surfaces: A molecular dynamics simulation study Open?Access
文章信息
作者：Jun Zhang, Hai-Qiang Fu, Mu-Zhi Guo, Zhao Wang, Li-Wen Li, Qi Yin, You-Guo Yan, Wei Wei, Wei-Feng Han, Jie Zhong
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引用方式：Jun Zhang, Hai-Qiang Fu, Mu-Zhi Guo, Zhao Wang, Li-Wen Li, Qi Yin, You-Guo Yan, Wei Wei, Wei-Feng Han, Jie Zhong, New insights into the deposition of natural gas hydrate on pipeline surfaces: A molecular dynamics simulation study, Petroleum Science, Volume 21, Issue 1, 2024, Pages 694-704, https://doi.org/10.1016/j.petsci.2023.08.027.
文章摘要
Abstract: Natural gas hydrate (NGH) can cause pipeline blockages during the transportation of oil and gas under high pressures and low temperatures. Reducing hydrate adhesion on pipelines is viewed as an efficient way to prevent NGH blockages. Previous studies suggested the water film can greatly increase hydrate adhesion in gas-dominant system. Herein, by performing the molecular dynamics simulations, we find in water-dominant system, the water film plays different roles in hydrate deposition on Fe and its corrosion surfaces. Specifically, due to the strong affinity of water on Fe surface, the deposited hydrate cannot convert the adsorbed water into hydrate, thus, a water film exists. As water affinities decrease (Fe?>?Fe2O3?>?FeO?>?Fe3O4), adsorbed water would convert to amorphous hydrate on Fe2O3 and form the ordered hydrate on FeO and Fe3O4 after hydrate deposition. While absorbed water film converts to amorphous or to hydrate, the adhesion strength of hydrate continuously increases (Fe?
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Keywords: Deposition; Natural gas hydrate; Pipelines; Water affinity; Adhesion strength