Experimental investigation of supercritical CO2 reactivity

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Presentation transcript:

Experimental investigation of supercritical CO2 reactivity 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

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

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

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.

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

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

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

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

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.