Gas Discharge Resistance and Medium Damage Degree as Hydrate Dissociation at Different Ambient Conditions

Frontiers in Energy Research

Energy Research

Peng Zhang¹  Qingbai Wu¹  Lianhai Zhang¹  Jing Zhan²  Shuaijun Li²  Xueping Chen²  Yingmei Wang³ 

[1] State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, China;State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, China;University of Chinese Academy of Sciences, Beijing, China;Western China Energy and Environment Research Center, Lanzhou University of Technology, Lanzhou, China;

关键词: methane hydrate;    discharge resistance;    damage degree;    porous medium;    depressurization;    ambient condition;   

DOI  :  10.3389/fenrg.2021.712156

 received in 2021-05-20, accepted in 2021-07-08,  发布年份 2021

来源: Frontiers

【 摘 要 】

For the investigation on some hydrate dissociation behaviors at different ambient conditions, methane hydrates formed inside porous media with different saturations were dissociated by depressurizations. Plots of the instantaneous flow rate of gas as dissociation versus production pressure as well as deformation of experimental sample versus accumulative amount of released gas were drawn. These two lines slopes are, respectively, characterized as gas discharge resistance and reciprocal of the latter one as damage degree of experimental samples. The results show that these formed hydrates at higher ambient conditions, that is, temperature and pressure, and possess a higher saturation, which is beneficial to discharge gas and to keep experimental samples undamaged. And the nonuniformity of dissociation processes at different layer positions induced by depressurization is inhibited significantly, especially while combining extra heating. Hydrate saturation dominates the total volume loss of these samples under loadings. These conclusions can provide reference for the prediction in gas discharge capability and media damage degree as hydrate dissociation at different experimental and natural ambient conditions.

【 授权许可】

Unknown   
Copyright © 2021 Chen, Zhang, Wu, Zhang, Li, Zhan and Wang.