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Experimental investigation of supercritical CO 2 reactivity

Centre de Géosciences. Experimental investigation of supercritical CO 2 reactivity. Olivier Regnault a , Vincent Lagneau a , Hubert Catalette b a ENSMP-CIG 35 rue Saint Honoré, 77305 Fontainebleau Cedex – olivier.regnault@ensmp.fr

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Experimental investigation of supercritical CO 2 reactivity

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  1. Centre de Géosciences Experimental investigation of supercritical CO2 reactivity Olivier Regnault a, Vincent Lagneau a, Hubert Catalette b a ENSMP-CIG 35 rue Saint Honoré, 77305 Fontainebleau Cedex – olivier.regnault@ensmp.fr b EdF R&D Département étude des matériaux, Site des Renardières Route de Sens, Ecuelles, 77818 Moret sur Loing Cedex French-Serbian European Summer University 16 – 25 October 2006 Renewable Energy Sources and the Environment

  2. sc-CO2 potential reactant dissolved CO2 main reactant Cap-rock ? CO2 Injection well scCO2/H2O cross dissolution ? Pure sc-CO2 H2O/aqCO2 silicate dissolution + carbonate precipitation Aquifer Context of the study

  3. Pressure ≈ 160 bars Temperature = 200°C Duration = 45 days P (bar) H2O/CO2 Anhydrous sc-CO2 X CO2 Experimental conditions

  4. Selection of minerals Selected pure minerals consistent with the mineralogy of a geological formation and the cements of the borehole seals : Anorthite (Feldspar, CaAl2Si2O8) Phlogopite (Mica) Forsterite (Olivine, Mg2Si2O5) Portlandite Ca(OH)2 Those minerals have been crushed to enhanced the reactive surface and provite fresh surfaces.

  5. T P sc-CO2 T Thermal compressor Injection pit Titanium cell Autoclave Schematic section of the experimental device Experimental protocol Powdered pure minerals

  6. Anorthite behaviours with a H2O/CO2 fluid (I) d Figure of dissolution and clay growth Tridymite (SiO2)

  7. Anorthite behaviours with a H2O/CO2 fluid (II) Aragonite (CaCO3) Calcite (CaCO3)

  8. Anorthite behaviours with anhydrous CO2 before reaction carbonate and clay growth fibrous calcite

  9. Conclusions and Prospect • An effective mineral reactivity exits and ought to be • considered for CO2 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.

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