Pore-scale analysis of relations between seepage characteristics and gas hydrate growth habit in porous sediments
Seepage characteristics of gas hydrate in quartz sands play important roles in gas production from hydrate-bearing sediments. Reported seepage characteristics varied from different experimental conditions due to different growth habits of gas hydrate in pores. It is critical to capture the essence o...
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ftchacadsciegiec:oai:ir.giec.ac.cn:344007/32673 2023-05-15T17:12:09+02:00 Pore-scale analysis of relations between seepage characteristics and gas hydrate growth habit in porous sediments Kou, Xuan Li, Xiao-Sen Wang, Yi Wan, Kun Chen, Zhao-Yang 2021-03-01 http://ir.giec.ac.cn/handle/344007/32673 https://doi.org/10.1016/j.energy.2020.119503 英语 eng PERGAMON-ELSEVIER SCIENCE LTD ENERGY http://ir.giec.ac.cn/handle/344007/32673 doi:10.1016/j.energy.2020.119503 Gas hydrate Growth habit X-ray CT Permeability Kozeny grain model METHANE-HYDRATE BEARING SEDIMENTS NETWORK MODEL MEDIA TOMOGRAPHY SATURATION EVOLUTION IMPACT Thermodynamics Energy & Fuels 期刊论文 2021 ftchacadsciegiec https://doi.org/10.1016/j.energy.2020.119503 2022-09-23T14:17:49Z Seepage characteristics of gas hydrate in quartz sands play important roles in gas production from hydrate-bearing sediments. Reported seepage characteristics varied from different experimental conditions due to different growth habits of gas hydrate in pores. It is critical to capture the essence of seepage variation in the presence of gas hydrate as can be employed in the prediction of long-term hydrate exploitation. In this work, the gas hydrate with different growth habits (grain-contacting and pore-filling) is synthesized in quartz sands porous media. The pore structure characteristics of the hydrate-bearing porous media has been identified by X-ray computed tomography (X-ray CT). Experimental results show that the formation and growth of gas hydrate in pores lead to the occurrence of non-interconnected pores, further limiting the validity of pore structure analyzation and the accuracy of permeability estimation. Hence, the interconnectivity degree with definite physics meaning is proposed to clarify the variation characteristics of pore structure. According to the linear correlation of interconnectivity degree with hydrate saturation, a modified permeability reduction model based on Kozeny grain model has been proposed to estimate the permeability variation of hydrate bearing porous media with different hydrate growth habits. The modified model yields a good prediction performance as is evaluated by a number of permeability measurements from experimental studies and the normalized mean squared error (NMSE). Given that the gas production from hydrate dissociation is a more complicated process which involves multi-phase fluid flow, the modified model can be further applied in permeability estimation during gas production from hydrate-bearing sediments. (C) 2020 Elsevier Ltd. All rights reserved. Report Methane hydrate Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences: GIEC OpenIR Energy 218 119503 |
institution |
Open Polar |
collection |
Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences: GIEC OpenIR |
op_collection_id |
ftchacadsciegiec |
language |
English |
topic |
Gas hydrate Growth habit X-ray CT Permeability Kozeny grain model METHANE-HYDRATE BEARING SEDIMENTS NETWORK MODEL MEDIA TOMOGRAPHY SATURATION EVOLUTION IMPACT Thermodynamics Energy & Fuels |
spellingShingle |
Gas hydrate Growth habit X-ray CT Permeability Kozeny grain model METHANE-HYDRATE BEARING SEDIMENTS NETWORK MODEL MEDIA TOMOGRAPHY SATURATION EVOLUTION IMPACT Thermodynamics Energy & Fuels Kou, Xuan Li, Xiao-Sen Wang, Yi Wan, Kun Chen, Zhao-Yang Pore-scale analysis of relations between seepage characteristics and gas hydrate growth habit in porous sediments |
topic_facet |
Gas hydrate Growth habit X-ray CT Permeability Kozeny grain model METHANE-HYDRATE BEARING SEDIMENTS NETWORK MODEL MEDIA TOMOGRAPHY SATURATION EVOLUTION IMPACT Thermodynamics Energy & Fuels |
description |
Seepage characteristics of gas hydrate in quartz sands play important roles in gas production from hydrate-bearing sediments. Reported seepage characteristics varied from different experimental conditions due to different growth habits of gas hydrate in pores. It is critical to capture the essence of seepage variation in the presence of gas hydrate as can be employed in the prediction of long-term hydrate exploitation. In this work, the gas hydrate with different growth habits (grain-contacting and pore-filling) is synthesized in quartz sands porous media. The pore structure characteristics of the hydrate-bearing porous media has been identified by X-ray computed tomography (X-ray CT). Experimental results show that the formation and growth of gas hydrate in pores lead to the occurrence of non-interconnected pores, further limiting the validity of pore structure analyzation and the accuracy of permeability estimation. Hence, the interconnectivity degree with definite physics meaning is proposed to clarify the variation characteristics of pore structure. According to the linear correlation of interconnectivity degree with hydrate saturation, a modified permeability reduction model based on Kozeny grain model has been proposed to estimate the permeability variation of hydrate bearing porous media with different hydrate growth habits. The modified model yields a good prediction performance as is evaluated by a number of permeability measurements from experimental studies and the normalized mean squared error (NMSE). Given that the gas production from hydrate dissociation is a more complicated process which involves multi-phase fluid flow, the modified model can be further applied in permeability estimation during gas production from hydrate-bearing sediments. (C) 2020 Elsevier Ltd. All rights reserved. |
format |
Report |
author |
Kou, Xuan Li, Xiao-Sen Wang, Yi Wan, Kun Chen, Zhao-Yang |
author_facet |
Kou, Xuan Li, Xiao-Sen Wang, Yi Wan, Kun Chen, Zhao-Yang |
author_sort |
Kou, Xuan |
title |
Pore-scale analysis of relations between seepage characteristics and gas hydrate growth habit in porous sediments |
title_short |
Pore-scale analysis of relations between seepage characteristics and gas hydrate growth habit in porous sediments |
title_full |
Pore-scale analysis of relations between seepage characteristics and gas hydrate growth habit in porous sediments |
title_fullStr |
Pore-scale analysis of relations between seepage characteristics and gas hydrate growth habit in porous sediments |
title_full_unstemmed |
Pore-scale analysis of relations between seepage characteristics and gas hydrate growth habit in porous sediments |
title_sort |
pore-scale analysis of relations between seepage characteristics and gas hydrate growth habit in porous sediments |
publisher |
PERGAMON-ELSEVIER SCIENCE LTD |
publishDate |
2021 |
url |
http://ir.giec.ac.cn/handle/344007/32673 https://doi.org/10.1016/j.energy.2020.119503 |
genre |
Methane hydrate |
genre_facet |
Methane hydrate |
op_relation |
ENERGY http://ir.giec.ac.cn/handle/344007/32673 doi:10.1016/j.energy.2020.119503 |
op_doi |
https://doi.org/10.1016/j.energy.2020.119503 |
container_title |
Energy |
container_volume |
218 |
container_start_page |
119503 |
_version_ |
1766068934334742528 |