| Summary: | 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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