THERMAL SCIENCE

International Scientific Journal

Na Wei

,

Wan-Tong Sun

,

Ying-Feng Meng

,

An-Qi Liu

,

Jin-Zhou Zhao

,

Chao-Yang Xu

,

Hai-Tao Li

,

Lin Jiang

,

Han-Ming Xu

CHANGE MECHANISM OF TRANSIENT GAS-LIQUID TWO-PHASE FLOW IN WELLBORE DURING MARINE NATURAL GAS HYDRATE RESERVOIR DRILLING

ABSTRACT
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.
KEYWORDS
marine natural gas hydrate, transient gas-liquid two-phase flow, drilling, numerical calculation, wellbore pressure
PAPER SUBMITTED: 2018-03-01
PAPER REVISED: 2018-09-01
PAPER ACCEPTED: 2018-10-01
PUBLISHED ONLINE: 2019-09-14
DOI REFERENCE: https://doi.org/10.2298/TSCI1904179W
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2019, VOLUME 23, ISSUE Issue 4, PAGES [2179 - 2187]
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Change mechanism of transient gas-liquid two-phase flow in wellbore during marine natural gas hydrate reservoir drilling

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