Presentation on theme: "Experimental investigation of supercritical CO2 reactivity"— Presentation transcript:
1Experimental investigation of supercritical CO2 reactivity Centre de GéosciencesExperimental investigation of supercritical CO2 reactivityOlivier Regnault a, Vincent Lagneau a, Hubert Catalette ba ENSMP-CIG 35 rue Saint Honoré, Fontainebleau Cedex –b EdF R&D Département étude des matériaux, Site des Renardières Route de Sens, Ecuelles, Moret sur Loing CedexFrench-Serbian European Summer University 16 – 25 October 2006Renewable Energy Sources and the Environment
2sc-CO2 potential reactant Context of the studyCap-rockAquifersilicate dissolution + carbonate precipitationdissolved CO2 main reactantsc-CO2 potential reactantPure sc-CO2cross dissolutionscCO2/H2OH2O/aqCO2?CO2 Injection well
4Selection of mineralsSelected pure minerals consistent with the mineralogyof a geological formation and the cements of the borehole seals :Anorthite (Feldspar, CaAl2Si2O8)Phlogopite (Mica)Forsterite (Olivine, Mg2Si2O5)Portlandite Ca(OH)2Those minerals have been crushed to enhanced the reactive surface and provite fresh surfaces.
5Schematic section of the experimental device Experimental protocolSchematic section of the experimental deviceAutoclaveInjection pitTitanium cellThermal compressorPTsc-CO2Powdered pure minerals
7Anorthite behaviours with a H2O/CO2 fluid (I) Figure of dissolutionand clay growthTridymite (SiO2)
8Anorthite behaviours with a H2O/CO2 fluid (II) Calcite (CaCO3)Aragonite (CaCO3)
9Anorthite behaviours with anhydrous CO2 before reactioncarbonate and clay growthfibrous calcite
10Conclusions and Prospect An effective mineral reactivity exits and ought to beconsidered for CO2 sequestration studies.The strong reactivity of portlandite Ca(OH)2 suggestspotential reaction with cements structures arround theborehole : possible decrease of the sealing properties.A new experiment is actually carried out : quantify andmeasure first the portlandite carbonation kinetics.