Numerical Simulation of Hydrate Decomposition during the Drilling Process of the Hydrate Reservoir in the Northern South China Sea
The process of drilling in natural gas hydrate reservoirs in sea areas involves problems such as hydrate decomposition and wellbore instability. To study the response behaviors of a reservoir during the drilling process, a two-dimensional numerical model of drilling fluid invading a hydrate reservoi...
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Online Access: | http://ir.giec.ac.cn/handle/344007/36457 http://ir.giec.ac.cn/handle/344007/36458 https://doi.org/10.3390/en15093273 |
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ftchacadsciegiec:oai:ir.giec.ac.cn:344007/36458 2023-12-24T10:18:34+01:00 Numerical Simulation of Hydrate Decomposition during the Drilling Process of the Hydrate Reservoir in the Northern South China Sea Zhang, Lei Zhang, Yu Chen, Chang Li, Xiao-Sen Chen, Zhao-Yang 2022-05-01 http://ir.giec.ac.cn/handle/344007/36457 http://ir.giec.ac.cn/handle/344007/36458 https://doi.org/10.3390/en15093273 英语 eng MDPI ENERGIES http://ir.giec.ac.cn/handle/344007/36457 http://ir.giec.ac.cn/handle/344007/36458 doi:10.3390/en15093273 drilling process hydrate decomposition secondary hydrate formation drilling fluid temperature salinity METHANE HYDRATE WELLBORE INSTABILITY BEARING SEDIMENTS SHENHU AREA GAS MODEL STABILITY INVASION KINETICS MUD Energy & Fuels 期刊论文 2022 ftchacadsciegiec https://doi.org/10.3390/en15093273 2023-11-24T01:15:45Z The process of drilling in natural gas hydrate reservoirs in sea areas involves problems such as hydrate decomposition and wellbore instability. To study the response behaviors of a reservoir during the drilling process, a two-dimensional numerical model of drilling fluid invading a hydrate reservoir in a cylindrical coordinate system was established to simulate the processes of heat and mass transfer, gas-liquid two-phase flow, and hydrate formation and decomposition in the hydrate reservoir during the drilling process. Based on the hydrate reservoir at station W17, Shenhu area of the South China Sea, the physical property response of the hydrate reservoir under different drilling fluid temperatures and salinity values was studied. The simulation results showed that during the drilling process, the temperature and pressure of the reservoir respond rapidly in a large area, further promoting the hydrate decomposition in the reservoir around the wellbore and leading to secondary hydrate formation. Moreover, a high hydrate saturation zone appears near the decomposed hydrate area in the layer without free gas, which corresponds to the low water saturation and high salinity zone. The hydrate decomposition area in the layer with free gas is larger than that without free gas. The increase in the drilling fluid temperature significantly enhances the hydrate decomposition in both layers of the reservoir. The hydrate decomposition near the wellbore under the high drilling fluid temperature will cause a sharp increase in the pressure in the reservoir, leading to the flow of pore fluid into the wellbore. The increase in drilling fluid salinity has little effect on the range of the hydrate decomposition in the reservoir but significantly increases the salinity of the pore water in the layer with free gas. As the drilling fluid temperature increases, the possibility of the gas invasion from the reservoir into the wellbore will be greatly increased at the early stage. Report Methane hydrate Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences: GIEC OpenIR Energies 15 9 3273 |
institution |
Open Polar |
collection |
Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences: GIEC OpenIR |
op_collection_id |
ftchacadsciegiec |
language |
English |
topic |
drilling process hydrate decomposition secondary hydrate formation drilling fluid temperature salinity METHANE HYDRATE WELLBORE INSTABILITY BEARING SEDIMENTS SHENHU AREA GAS MODEL STABILITY INVASION KINETICS MUD Energy & Fuels |
spellingShingle |
drilling process hydrate decomposition secondary hydrate formation drilling fluid temperature salinity METHANE HYDRATE WELLBORE INSTABILITY BEARING SEDIMENTS SHENHU AREA GAS MODEL STABILITY INVASION KINETICS MUD Energy & Fuels Zhang, Lei Zhang, Yu Chen, Chang Li, Xiao-Sen Chen, Zhao-Yang Numerical Simulation of Hydrate Decomposition during the Drilling Process of the Hydrate Reservoir in the Northern South China Sea |
topic_facet |
drilling process hydrate decomposition secondary hydrate formation drilling fluid temperature salinity METHANE HYDRATE WELLBORE INSTABILITY BEARING SEDIMENTS SHENHU AREA GAS MODEL STABILITY INVASION KINETICS MUD Energy & Fuels |
description |
The process of drilling in natural gas hydrate reservoirs in sea areas involves problems such as hydrate decomposition and wellbore instability. To study the response behaviors of a reservoir during the drilling process, a two-dimensional numerical model of drilling fluid invading a hydrate reservoir in a cylindrical coordinate system was established to simulate the processes of heat and mass transfer, gas-liquid two-phase flow, and hydrate formation and decomposition in the hydrate reservoir during the drilling process. Based on the hydrate reservoir at station W17, Shenhu area of the South China Sea, the physical property response of the hydrate reservoir under different drilling fluid temperatures and salinity values was studied. The simulation results showed that during the drilling process, the temperature and pressure of the reservoir respond rapidly in a large area, further promoting the hydrate decomposition in the reservoir around the wellbore and leading to secondary hydrate formation. Moreover, a high hydrate saturation zone appears near the decomposed hydrate area in the layer without free gas, which corresponds to the low water saturation and high salinity zone. The hydrate decomposition area in the layer with free gas is larger than that without free gas. The increase in the drilling fluid temperature significantly enhances the hydrate decomposition in both layers of the reservoir. The hydrate decomposition near the wellbore under the high drilling fluid temperature will cause a sharp increase in the pressure in the reservoir, leading to the flow of pore fluid into the wellbore. The increase in drilling fluid salinity has little effect on the range of the hydrate decomposition in the reservoir but significantly increases the salinity of the pore water in the layer with free gas. As the drilling fluid temperature increases, the possibility of the gas invasion from the reservoir into the wellbore will be greatly increased at the early stage. |
format |
Report |
author |
Zhang, Lei Zhang, Yu Chen, Chang Li, Xiao-Sen Chen, Zhao-Yang |
author_facet |
Zhang, Lei Zhang, Yu Chen, Chang Li, Xiao-Sen Chen, Zhao-Yang |
author_sort |
Zhang, Lei |
title |
Numerical Simulation of Hydrate Decomposition during the Drilling Process of the Hydrate Reservoir in the Northern South China Sea |
title_short |
Numerical Simulation of Hydrate Decomposition during the Drilling Process of the Hydrate Reservoir in the Northern South China Sea |
title_full |
Numerical Simulation of Hydrate Decomposition during the Drilling Process of the Hydrate Reservoir in the Northern South China Sea |
title_fullStr |
Numerical Simulation of Hydrate Decomposition during the Drilling Process of the Hydrate Reservoir in the Northern South China Sea |
title_full_unstemmed |
Numerical Simulation of Hydrate Decomposition during the Drilling Process of the Hydrate Reservoir in the Northern South China Sea |
title_sort |
numerical simulation of hydrate decomposition during the drilling process of the hydrate reservoir in the northern south china sea |
publisher |
MDPI |
publishDate |
2022 |
url |
http://ir.giec.ac.cn/handle/344007/36457 http://ir.giec.ac.cn/handle/344007/36458 https://doi.org/10.3390/en15093273 |
genre |
Methane hydrate |
genre_facet |
Methane hydrate |
op_relation |
ENERGIES http://ir.giec.ac.cn/handle/344007/36457 http://ir.giec.ac.cn/handle/344007/36458 doi:10.3390/en15093273 |
op_doi |
https://doi.org/10.3390/en15093273 |
container_title |
Energies |
container_volume |
15 |
container_issue |
9 |
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3273 |
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1786207614249467904 |