Presentation on theme: "Experimental investigation of supercritical CO 2 reactivity Centre de Géosciences Olivier Regnault a, Vincent Lagneau a, Hubert Catalette b a ENSMP-CIG."— Presentation transcript:
Experimental investigation of supercritical CO 2 reactivity Centre de Géosciences Olivier Regnault a, Vincent Lagneau a, Hubert Catalette b a 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 Cedex French-Serbian European Summer University 16 – 25 October 2006 Renewable Energy Sources and the Environment
Cap-rock Aquifer silicate dissolution + carbonate precipitation dissolved CO2 main reactant sc-CO 2 potential reactant Pure sc-CO 2 cross dissolution scCO 2 /H 2 O H 2 O/aqCO 2 ? ? CO 2 Injection well Context of the study
Experimental conditions Pressure ≈ 160 bars Temperature = 200°C Duration = 45 days X CO 2 P (bar) Anhydrous sc-CO 2 H 2 O/CO 2
Selection of minerals Selected pure minerals consistent with the mineralogy of a geological formation and the cements of the borehole seals : Anorthite (Feldspar, CaAl 2 Si 2 O 8 ) Phlogopite (Mica) Forsterite (Olivine, Mg 2 Si 2 O 5 ) Portlandite Ca(OH) 2 Those minerals have been crushed to enhanced the reactive surface and provite fresh surfaces.
Powdered pure minerals Schematic section of the experimental device Autoclave Injection pit Titanium cell Thermal compressor P T T sc-CO 2 Experimental protocol
Anorthite behaviours with a H2O/CO2 fluid (I) d Figure of dissolution and clay growth Tridymite (SiO 2 )
Calcite (CaCO 3 ) Aragonite (CaCO 3 ) Anorthite behaviours with a H2O/CO2 fluid (II)
Anorthite behaviours with anhydrous CO 2 before reaction carbonate and clay growth fibrous calcite
Conclusions and Prospect - An effective mineral reactivity exits and ought to be considered for CO 2 sequestration studies. - The strong reactivity of portlandite Ca(OH) 2 suggests potential reaction with cements structures arround the borehole : possible decrease of the sealing properties. - A new experiment is actually carried out : quantify and measure first the portlandite carbonation kinetics.