Cristin-resultat-ID: 1498211
Sist endret: 16. november 2017 11:49
NVI-rapporteringsår: 2017
Resultat
Vitenskapelig artikkel
2017

Vertical Equilibrium Flow Models with Fully Coupled Geomechanics for CO<sub>2</sub> Storage Modeling, Using Precomputed Mechanical Response Functions

Bidragsytere:
  • Odd Andersen
  • Halvor Møll Nilsen og
  • Sarah Eileen Gasda

Tidsskrift

Energy Procedia
ISSN 1876-6102
e-ISSN 1876-6102
NVI-nivå 0

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2017
Volum: 114
Sider: 3113 - 3131
Open Access

Importkilder

Scopus-ID: 2-s2.0-85029635220

Beskrivelse Beskrivelse

Tittel

Vertical Equilibrium Flow Models with Fully Coupled Geomechanics for CO&lt;sub&gt;2&lt;/sub&gt; Storage Modeling, Using Precomputed Mechanical Response Functions

Sammendrag

Vertical equilibrium (VE) models have proved to be attractive for simulation of \co storage scenarios. Their primary advantage is a substantial reduction in computational requirements compared to standard 3D simulation tools. In this work, we aim to include the effects of geomechanics on aquifer flow while preserving computational efficiency. When fluids are injected into a geological formation, changes in pore pressure leads to rock deformation, which influence the flow properties of the formation. To fully model this effect, a two way coupling between flow and mechanics equations is generally necessary, including the full under- and overburden. This leads to a computationally expensive system, thus reducing the computational advantage of using VE models. Within a linear poroelastic framework, the full effect of deformation on flow is captured through changes in volumetric strain, which can be precomputed for a given pressure basis at grid generation time and used directly in the flow equations during simulation. This allow us to model the full effect of geomechanics on aquifer flow while eliminating the need for solving the mechanics equations at simulation time. We demonstrate the approach on 2D and 3D examples, and compare with results obtained from a standard VE flow models and a model that includes the full poroelastic set of equations. Compared to the latter, we observe a significant computational benefit using our proposed approach. On the other hand, the impact of geomechanics appears to be primarily captured by a well-chosen rock compressibility coefficient, suggesting that a fully coupled model might not be required in many practical cases.

Bidragsytere

Odd Andersen

  • Tilknyttet:
    Forfatter
    ved Mathematics and Cybernetics ved SINTEF AS
  • Tilknyttet:
    Forfatter
    ved Matematisk institutt ved Universitetet i Bergen

Halvor Møll Nilsen

  • Tilknyttet:
    Forfatter
    ved Mathematics and Cybernetics ved SINTEF AS

Sarah Gasda

Bidragsyterens navn vises på dette resultatet som Sarah Eileen Gasda
  • Tilknyttet:
    Forfatter
    ved NORCE Energi ved NORCE Norwegian Research Centre AS
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