INTECIN   20395
INSTITUTO DE TECNOLOGIAS Y CIENCIAS DE LA INGENIERIA "HILARIO FERNANDEZ LONG"
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Effects of the presence of CO2 at the well/caprock interface: crystallization damage
Autor/es:
DIEGO MANZANAL; JEAN MICHEL PEREIRA
Lugar:
Nantes
Reunión:
Conferencia; 32nd International Conference on Ocean, Offshore and Arctic Engineering (OMAE); 2013
Institución organizadora:
Laboratoire de recherche en Hydrodynamique, Energétique et Environnement Atmosphérique CNRS UMR 6598 Ecole Centrale de Nantes
Resumen:
In the context of CO2 geological storage, it is important to
assess the safety and efficiency of the storage operation and
thus to prevent CO2 leakage. Most probable leakage paths are
constituted by the natural (faults) or artificial (around wells)
interfaces.
In this study, the effects of the presence of carbon dioxide
on the behaviour of a particular interface are considered. A
chemo-poro-mechanical model for the excavated damaged zone
located at the interface between the injection well cement and
the caprock has been developed. This constitutive model
accounts for the precipitation of calcium carbonates coming
from the carbonation of the well cement. Crystallisation
pressure induced by these carbonates modifies the stress state in
the materials at the interface. The model couples a simplified
chemistry of carbonates precipitation with a poro-mechanical
model accounting for damage of geomaterials due to tensile
stress states. This poro-mechanical model is developed at the
macroscale but an insight into the material's microstructure is
also included through a description of the material's pore size
distribution and its evolution with crystallisation and damage.