Formation of nanobubbles generated by hydrate decomposition:A molecular dynamics study  

作　　者：王梓霖 杨亮 刘长生 林仕伟 Zilin Wang;Liang Yang;Changsheng Liu;Shiwei Lin(State Key Laboratory of Marine Resource Utilization in South China Sea,Hainan University,Haikiiu 570228,China;School of Materials Science and Engineering,Hainan University,Haikiiu 570228,China)

机构地区：[1]State Key Laboratory of Marine Resource Utilization in South China Sea,Hainan University,Haikiiu 570228,China [2]School of Materials Science and Engineering,Hainan University,Haikiiu 570228,China

出　　处：《Chinese Physics B》2023年第2期215-222,共8页中国物理B（英文版）

基　　金：supported by the specific research fund of the Innovation Platform for Academicians of Hainan Province of China and the Hainan Provincial Natural Science Foundation of China (Grant No. 519MS025)。

摘　　要：Natural gas hydrate is estimated to have huge reserves. Its exploitation can solve the global oil and gas shortage problem. Hydrates decompose into water and methane, and methane molecules are supersaturated to form nanobubbles.Methane nanobubbles can affect the decomposition efficiency of hydrates. They can provide abundant methane sources for the re-nucleation of hydrates. Molecular dynamics is employed in this study to investigate the decomposition process of type I methane hydrate and the formation of methane nanobubbles generated during decomposition under different methane mole fraction, pressures, and temperatures. The results indicate that external pressure inhibits the diffusion of methane molecules, thereby preventing the formation of nanobubbles. A higher mole fraction of methane molecules in the system requires a higher external pressure to generate stable nanobubbles after the decomposition of the hydrate structure.At 330 K, it is easy to form a nanobubble structure. Results of this study can help provide ideas for the study of efficient extraction and secondary nucleation of hydrates.

关 键 词：molecular dynamics methane hydrate NANOBUBBLES stability 

分 类 号：TE31[石油与天然气工程—油气田开发工程]