English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

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.

Change mechanism of transient gas-liquid two-phase flow in wellbore during marine natural gas hydrate reservoir drilling