We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Simultaneous gas and water flow in a damage-susceptible bedded argillaceous rock<sup>1</sup>.
- Authors
Nguyen, T.S.; Le, A.D.
- Abstract
A mathematical model that couples the governing and constitutive equations of two-phase flow and mechanical equilibrium has been developed to simulate gas injection tests for both laboratory- and field-scale experiments. The model takes into consideration the inherent anisotropy of sedimentary rocks due to bedding by including an anisotropic elastoplastic model for the mechanical process and using an anisotropic permeability tensor for the flow processes for both water and gas. The gas and water flow rates are assumed to follow Darcy's law. The relative permeability of each phase and their respective degrees of saturation are represented by the Van Genuchten's functions. We simulated laboratory and field gas injection experiments in Opalinus clay, a candidate geological formation for the geological disposal of radioactive wastes. The numerical results show good agreement with the experimental data measured in these tests in terms of two-phase flow regimes and hydromechanical response at various monitoring locations. Damage zones, either pre-existing due to excavation or induced by high gas injection pressure, are shown to clearly influence the gas flow rates and directions and would need special consideration in the design and safety assessment of the repository system.
- Subjects
GAS injection; COMPUTER simulation of two-phase flow; STATIC equilibrium (Physics); SEDIMENTARY rocks; ANISOTROPY; ELASTOPLASTICITY; RADIOACTIVE waste disposal in the ground; MATHEMATICAL models
- Publication
Canadian Geotechnical Journal, 2015, Vol 52, Issue 1, p18
- ISSN
0008-3674
- Publication type
Article
- DOI
10.1139/cgj-2013-0457