The impacts of scaled capillary pressure combined with coupled flow and geomechanics on gas hydrate deposits

Yoon, Hyun Chul; Kim, Jihoon

doi:10.1016/j.gete.2023.100529

Cited by 1 publication

(2 citation statements)

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“…Furthermore, fracture capillary pressure mechanisms play a pivotal role in the behavior of multiphase flow in fractured rock formations, necessitating comprehensive efforts in physical interpretation, mathematical formulation, and computational simulation to elucidate the underlying processes . A multitude of investigations have been conducted to discern the intricate interplay between capillary pressure dynamics and shifts in the hydrate phase in gas hydrate deposits. − Notably, empirical findings by Yan et al have underscored the propensity for heightened hydrate saturation to elevate the capillary pressure curve.…”

Section: Introductionmentioning

confidence: 99%

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Implementation of a Numerically Stable Algorithm for Capillary Hysteresis in Gas Hydrate Deposits

Kim,

Yoon

2024

Energy Fuels

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We develop a numerically stable algorithm of intrinsic capillary hysteresis for numerical simulation of gas hydrate deposits where cyclic drainage and imbibition processes occur. The algorithm is motivated by the elastoplastic return mapping, and it is an extension of the recently developed algorithm of two-phase immiscible flow, which provides numerical stability with the fully implicit method. We consider the effective gas and aqueous saturations normalized by total fluid phase saturation implicitly affected by the dynamic formation and dissociation of hydrates. Specifically, gas saturation is additively decomposed into the reversible and irreversible parts, and the algorithm computes the reversible and irreversible parts dynamically during the evolution of gas saturation. We perform numerical tests, including a field-scale case, by implementing the code of the capillary hysteresis in a gas hydrate flow simulator. We find that the developed algorithm is stable and robust for repeated drainage and imbibition processes in gas hydrate systems. Since cyclic depressurization is one of the promising production scenarios for gas production from marine gas hydrate deposits, the developed algorithm and code will provide robust and high-fidelity simulation in the forward simulation of multiphase flow.

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Section: Introductionmentioning

confidence: 99%

“…Both of them are related to solid phase structures. Yoon and Kim studied the impact of pore volume changes and scaling effects induced by hydrate dissociation/formation as well as geomechanics on capillary hysteresis, while the intrinsic capillary hysteresis was not considered.…”

Section: Introductionmentioning

confidence: 99%