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Thermo-hydro-mechanical coupled modeling of methane hydrate-bearing sediments: formulation and application

Thermo-hydro-mechanical coupled modeling of methane hydrate-bearing sediments: formulation and application
Thermo-hydro-mechanical coupled modeling of methane hydrate-bearing sediments: formulation and application

We present a fully coupled thermo-hydro-mechanical formulation for the simulation of sediment deformation, fluid and heat transport and fluid/solid phase transformations occurring in methane hydrate geological systems. We reformulate the governing equations of energy and mass balance of the Code_Bright simulator to incorporate hydrate as a new pore phase. The formulation also integrates the constitutive model Hydrate-CASM to capture the effect of hydrate saturation in the mechanical response of the sediment. The thermo-hydraulic capabilities of the formulation are validated against the results from a series of state-of-the-art simulators involved in the first international gas hydrate code comparison study developed by the NETL-USGS. The coupling with the mechanical formulation is investigated by modeling synthetic dissociation tests and validated by reproducing published experimental data from triaxial tests performed in hydrate-bearing sands dissociated via depressurization. Our results show that the formulation captures the dominant mass and heat transfer phenomena occurring during hydrate dissociation and reproduces the stress release and volumetric deformation associated with this process. They also show that the hydrate production method has a strong influence on sediment deformation.

Fully coupled numerical modeling, Geomechanics, Mechanical response induced by hydrate dissociation, Methane hydrate-bearing sediments, Thermo-hydro-mechanical behavior
1996-1073
1-23
De La Fuente, Maria
327351b7-cd3e-4e19-85a4-1b92a60c1971
Vaunat, Jean
c8939ecb-3c86-4cf1-9286-cd97acdee002
Marín-Moreno, Héctor
d246fc62-25f7-4134-bc59-a3bf1bba4dd5
De La Fuente, Maria
327351b7-cd3e-4e19-85a4-1b92a60c1971
Vaunat, Jean
c8939ecb-3c86-4cf1-9286-cd97acdee002
Marín-Moreno, Héctor
d246fc62-25f7-4134-bc59-a3bf1bba4dd5

De La Fuente, Maria, Vaunat, Jean and Marín-Moreno, Héctor (2019) Thermo-hydro-mechanical coupled modeling of methane hydrate-bearing sediments: formulation and application. Energies, 12 (11), 1-23. (doi:10.3390/en12112178).

Record type: Article

Abstract

We present a fully coupled thermo-hydro-mechanical formulation for the simulation of sediment deformation, fluid and heat transport and fluid/solid phase transformations occurring in methane hydrate geological systems. We reformulate the governing equations of energy and mass balance of the Code_Bright simulator to incorporate hydrate as a new pore phase. The formulation also integrates the constitutive model Hydrate-CASM to capture the effect of hydrate saturation in the mechanical response of the sediment. The thermo-hydraulic capabilities of the formulation are validated against the results from a series of state-of-the-art simulators involved in the first international gas hydrate code comparison study developed by the NETL-USGS. The coupling with the mechanical formulation is investigated by modeling synthetic dissociation tests and validated by reproducing published experimental data from triaxial tests performed in hydrate-bearing sands dissociated via depressurization. Our results show that the formulation captures the dominant mass and heat transfer phenomena occurring during hydrate dissociation and reproduces the stress release and volumetric deformation associated with this process. They also show that the hydrate production method has a strong influence on sediment deformation.

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Accepted/In Press date: 4 June 2019
Published date: 7 June 2019
Keywords: Fully coupled numerical modeling, Geomechanics, Mechanical response induced by hydrate dissociation, Methane hydrate-bearing sediments, Thermo-hydro-mechanical behavior

Identifiers

Local EPrints ID: 432052
URI: https://eprints.soton.ac.uk/id/eprint/432052
ISSN: 1996-1073
PURE UUID: 43b309b8-8a89-4875-8cd7-29873468bb91

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Date deposited: 28 Jun 2019 16:30
Last modified: 09 Dec 2019 17:34

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