Reservoir formation damage during hydrate dissociation in sand-clay sediment from Qilian Mountain permafrost, China
Permeability is known as a key factor affecting the gas production effectiveness from the natural gas hydrate-bearing reservoir. We studied the permeability behavior of natural clayey sand core samples from a natural hydrate-bearing reservoir in the Qilian Mountain permafrost before and after hydrat...
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ftchacadsciegiec:oai:ir.giec.ac.cn:344007/26753 2023-05-15T17:12:09+02:00 Reservoir formation damage during hydrate dissociation in sand-clay sediment from Qilian Mountain permafrost, China Wang, Yi Pan, Mengdi Mayanna, Sathish Schleicher, Anja M. Spangenberg, Erik Schicks, Judith M. 2020-04-01 http://ir.giec.ac.cn/handle/344007/26753 https://doi.org/10.1016/j.apenergy.2020.114619 英语 eng ELSEVIER SCI LTD APPLIED ENERGY http://ir.giec.ac.cn/handle/344007/26753 doi:10.1016/j.apenergy.2020.114619 Gas hydrate Reservoir formation damage Qilian Mountain Hydrate dissociation Gas production METHANE HYDRATE GAS-PRODUCTION PERMEABILITY QINGHAI VERIFICATION SANDSTONES EXCHANGE SYSTEM WELL Energy & Fuels Engineering Chemical 期刊论文 2020 ftchacadsciegiec https://doi.org/10.1016/j.apenergy.2020.114619 2022-09-23T14:15:44Z Permeability is known as a key factor affecting the gas production effectiveness from the natural gas hydrate-bearing reservoir. We studied the permeability behavior of natural clayey sand core samples from a natural hydrate-bearing reservoir in the Qilian Mountain permafrost before and after hydrate formation, as well as after hydrate decomposition. We found a substantially lower permeability after hydrate decomposition and assumed a formation damage process involving fines mobilization, migration and deposition at pore throats. The assumption was proved by SEM analysis of the filter paper separating the sample and the end caps containing the fluid ports. The analysis showed fines trapped in the paper from the outlet side. Fines migration and resulting formation damage is known from enhanced oil recovery by low salinity water flooding, but was unexpected for hydrate decomposition. The underlying mechanism was identified by a series of different permeability tests. The results indicate that fresh water released from the hydrate dissociation causes the fines mobilization, migration and redeposition at pore throats leading to the observed permeability decrease. Obviously the large volume of released methane gas displaces the remaining saline water and separates it from the fresh water released from the hydrate. The fresh water in contact with parts of the grain framework causes the detachment of clay particles by increased electrostatic forces and clay swelling, if swellable clays are present. This is an important mechanism that has to be taken into account in the planning of gas production from low-permeability clayey hydrate-bearing formations. Report Methane hydrate permafrost Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences: GIEC OpenIR Applied Energy 263 114619 |
institution |
Open Polar |
collection |
Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences: GIEC OpenIR |
op_collection_id |
ftchacadsciegiec |
language |
English |
topic |
Gas hydrate Reservoir formation damage Qilian Mountain Hydrate dissociation Gas production METHANE HYDRATE GAS-PRODUCTION PERMEABILITY QINGHAI VERIFICATION SANDSTONES EXCHANGE SYSTEM WELL Energy & Fuels Engineering Chemical |
spellingShingle |
Gas hydrate Reservoir formation damage Qilian Mountain Hydrate dissociation Gas production METHANE HYDRATE GAS-PRODUCTION PERMEABILITY QINGHAI VERIFICATION SANDSTONES EXCHANGE SYSTEM WELL Energy & Fuels Engineering Chemical Wang, Yi Pan, Mengdi Mayanna, Sathish Schleicher, Anja M. Spangenberg, Erik Schicks, Judith M. Reservoir formation damage during hydrate dissociation in sand-clay sediment from Qilian Mountain permafrost, China |
topic_facet |
Gas hydrate Reservoir formation damage Qilian Mountain Hydrate dissociation Gas production METHANE HYDRATE GAS-PRODUCTION PERMEABILITY QINGHAI VERIFICATION SANDSTONES EXCHANGE SYSTEM WELL Energy & Fuels Engineering Chemical |
description |
Permeability is known as a key factor affecting the gas production effectiveness from the natural gas hydrate-bearing reservoir. We studied the permeability behavior of natural clayey sand core samples from a natural hydrate-bearing reservoir in the Qilian Mountain permafrost before and after hydrate formation, as well as after hydrate decomposition. We found a substantially lower permeability after hydrate decomposition and assumed a formation damage process involving fines mobilization, migration and deposition at pore throats. The assumption was proved by SEM analysis of the filter paper separating the sample and the end caps containing the fluid ports. The analysis showed fines trapped in the paper from the outlet side. Fines migration and resulting formation damage is known from enhanced oil recovery by low salinity water flooding, but was unexpected for hydrate decomposition. The underlying mechanism was identified by a series of different permeability tests. The results indicate that fresh water released from the hydrate dissociation causes the fines mobilization, migration and redeposition at pore throats leading to the observed permeability decrease. Obviously the large volume of released methane gas displaces the remaining saline water and separates it from the fresh water released from the hydrate. The fresh water in contact with parts of the grain framework causes the detachment of clay particles by increased electrostatic forces and clay swelling, if swellable clays are present. This is an important mechanism that has to be taken into account in the planning of gas production from low-permeability clayey hydrate-bearing formations. |
format |
Report |
author |
Wang, Yi Pan, Mengdi Mayanna, Sathish Schleicher, Anja M. Spangenberg, Erik Schicks, Judith M. |
author_facet |
Wang, Yi Pan, Mengdi Mayanna, Sathish Schleicher, Anja M. Spangenberg, Erik Schicks, Judith M. |
author_sort |
Wang, Yi |
title |
Reservoir formation damage during hydrate dissociation in sand-clay sediment from Qilian Mountain permafrost, China |
title_short |
Reservoir formation damage during hydrate dissociation in sand-clay sediment from Qilian Mountain permafrost, China |
title_full |
Reservoir formation damage during hydrate dissociation in sand-clay sediment from Qilian Mountain permafrost, China |
title_fullStr |
Reservoir formation damage during hydrate dissociation in sand-clay sediment from Qilian Mountain permafrost, China |
title_full_unstemmed |
Reservoir formation damage during hydrate dissociation in sand-clay sediment from Qilian Mountain permafrost, China |
title_sort |
reservoir formation damage during hydrate dissociation in sand-clay sediment from qilian mountain permafrost, china |
publisher |
ELSEVIER SCI LTD |
publishDate |
2020 |
url |
http://ir.giec.ac.cn/handle/344007/26753 https://doi.org/10.1016/j.apenergy.2020.114619 |
genre |
Methane hydrate permafrost |
genre_facet |
Methane hydrate permafrost |
op_relation |
APPLIED ENERGY http://ir.giec.ac.cn/handle/344007/26753 doi:10.1016/j.apenergy.2020.114619 |
op_doi |
https://doi.org/10.1016/j.apenergy.2020.114619 |
container_title |
Applied Energy |
container_volume |
263 |
container_start_page |
114619 |
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1766068941721960448 |