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CHANGE MECHANISM OF TRANSIENT GAS-LIQUID TWO-PHASE FLOW IN WELLBORE DURING MARINE NATURAL GAS HYDRATE RESERVOIR DRILLING
被引:11
作者:
Wei, Na
[1
]
Sun, Wan-Tong
[1
]
Meng, Ying-Feng
[1
]
Liu, An-Qi
[2
]
Zhao, Jin-Zhou
[1
]
Xu, Chao-Yang
[3
]
Li, Hai-Tao
[1
]
Jiang, Lin
[1
]
Xu, Han-Ming
[1
]
机构:
[1] Southwest Petr Univ, State Key Lab Oil & Gas Reservoir Geol & Exploita, Chengdu, Sichuan, Peoples R China
[2] Chuan Qing Drilling Engn Co Ltd, Geol Explorat & Dev Inst, Chengdu, Sichuan, Peoples R China
[3] CNPC Bohai Drilling Engn Co Ltd, Direct Drilling Serv Co, Tianjin, Peoples R China
来源:
THERMAL SCIENCE
|
2019年
/
23卷
/
04期
关键词:
marine natural gas hydrate;
transient gas-liquid two-phase flow;
drilling;
numerical calculation;
wellbore pressure;
MULTIPHASE FLOW;
METHANE;
KINETICS;
ANNULUS;
GROWTH;
WATER;
MODEL;
AUSM;
D O I:
10.2298/TSCI1904179W
中图分类号:
O414.1 [热力学];
学科分类号:
摘要:
In the drilling process of a marine natural gas hydrate reservoir, the original temperature and pressure condition of the hydrate will change due to the influence of construction, and gas will be released from the hydrate. The decomposition gas makes the wellbore flow into a complex gas-liquid-solid multiphase flow after entering into the wellbore, and thus poses a great threat to the well control security. Accordingly a transient gas-liquid two-phase flow drift flux mathematical model is established in this paper. The numerical method is proposed and verified, and an example analysis is carried out. Finally the change mechanism of transient gas-liquid two-phase flow in wellbore is obtained. This study provides an important foundation for the safe design of an offshore gas hydrate. Meanwhile, it is of great positive significance to find the decomposition gas and to optimize drilling parameters in the drilling process of a marine natural gas hydrate reservoir.
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页码:2179 / 2187
页数:9
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