What question did this study set out to answer?

To investigate the behavior of three-phase flow involving drilling mud, cuttings, and invaded gas across different wellbore trajectories to improve pressure control during seabed hydrate drilling.

February 7, 2025ProcessesOpen Access

Simulation Study of Wellbore Three-Phase Flow After Gas Invasion in Large-Displacement Wells Drilled in Seabed Hydrates

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Authors

BLBin LiXi'an University of Science and Technology JDJianwei DiChina National Offshore Oil Corporation (China)XWXiaodong WuChina National Offshore Oil Corporation (China)

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Implication

Computational fluid dynamics study reveals how gas invasion alters cuttings transport and pressure gradients in seabed hydrate drilling, highlighting fluid density controls to manage wellbore risks.

Key Points

To investigate the behavior of three-phase flow involving drilling mud, cuttings, and invaded gas across different wellbore trajectories to improve pressure control during seabed hydrate drilling.
Optimized an Eulerian multiphase computational fluid dynamics model coupled with particle dynamics using Fluent 23R1 software.
Simulated three-phase flow (water-based drilling fluid, rock cuttings, and invaded gas) across vertical, build-up, and horizontal wellbore annular sections under varied gas velocities and volume fractions.
Gas invasion velocity accelerated cutting upward return in vertical and horizontal sections more significantly than gas volume fraction, with minimal impact observed in the build-up section.
Gas influx decreased the pressure gradient in the vertical section, increased the gradient in the horizontal section, and demonstrated a strong linear correlation with drilling fluid density across all sections.

Cite This Study

Li et al. (2025) studied this question.

synapsesocial.com/papers/6a6f7361a528af2d65c2fe7c https://doi.org/10.3390/pr13020455

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Implication

Computational fluid dynamics study reveals how gas invasion alters cuttings transport and pressure gradients in seabed hydrate drilling, highlighting fluid density controls to manage wellbore risks.

Simulation Study of Wellbore Three-Phase Flow After Gas Invasion in Large-Displacement Wells Drilled in Seabed Hydrates

Discussion

Member takes

Implication

Key Points

Cite This Study

Simulation Study of Wellbore Three-Phase Flow After Gas Invasion in Large-Displacement Wells Drilled in Seabed Hydrates

Discussion

Member takes

Implication

Key Points

Cite This Study

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