Experimental and Numerical Simulation of the Injection of a CO2 Saturated Solution in a Carbonate Reservoir: Application to the CO2-DISSOLVED Concept Combining CO2 Geological Storage and Geothermal Heat Recovery

A. Randi (1) , J. Sterpenich (1) , Dominique Thiéry (2) , Christophe Kervévan (2) , J. Pironon (1) , C. Morlot (1)

1 GeoRessources
2 BRGM - Bureau de Recherches Géologiques et Minières (BRGM)

The CO2-DISSOLVED project explores the technical and economic feasibility of a promising concept combining CO2 storage and geothermal heat extraction. The CO2 released by low CO2 emitters is dissolved in the extracted brine via a doublet heat exchanger system. To study the effect to CO2-rich and thus acidic solution in the geothermal doublet, three reactive flow-through experiments mimicking the injection of a CO2 rich solution were performed. The chemical interactions in the near-injection well area between the reservoir rock, the cement phases and the acidic CO2-rich solution was investigated under geothermal reservoir conditions. The main results are i) the formation of a highly permeable network due to specific dissolution pattern called wormholes, and ii) the preservation of mechanical cohesion the cement/rock interface despite the cement carbonation. The experimental results are compared with those obtained by chemical-transport modelling with the coupled PHREEQC-MARTHE codes.

Domaines: Hydrologie; Géochimie

A. Randi, J. Sterpenich, Dominique Thiéry, Christophe Kervévan, J. Pironon, et al.. Experimental and Numerical Simulation of the Injection of a CO2 Saturated Solution in a Carbonate Reservoir: Application to the CO2-DISSOLVED Concept Combining CO2 Geological Storage and Geothermal Heat Recovery. Energy Procedia, 2017, 114, pp.2942 - 2956. ⟨10.1016/j.egypro.2017.03.1423⟩. ⟨hal-01599191⟩