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| Titel |
Presentation of the new ICARE 4 set-up: principle and first results on the reactive-percolation experiments and modelling |
| VerfasserIn |
Elodie Jeandel, Alain Dimier, Anssi Myrttinen, Olaf Ukelis, Roman Zorn |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250051189
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| Zusammenfassung |
| Carbon dioxide Capture and Storage (CCS) in deep geological formations has emerged over
the past ten years as an important component of the portfolio of options for reducing
greenhouse emissions.
However, more knowledge needs to be aquired about the CO2-brine-rock interactions
induced by the supercritical CO2-injection, notably potential dissolution/precipitation
processes occurring in the host rock and their effects on the fluid-transport properties.
As the understanding and the quantification of such processes are of paramount
importance to assess the feasibility and demonstrate the safety of the geological sequestration
of CO2, it is particularly relevant to have an experimental apparatus enabling to mimic the
conditions occurring in the geological media, in terms of pressure, temperature, chemistry,
flow rates and partial pressure of CO2.
Therefore, a new experimental set-up, ICARE 4, has been built-up to perform reactive
percolation experiments on rock specimens, in order to investigate the chemical reactions and
modifications on the hydrodynamics properties, such as porosity and permeability, induced
by the CO2/brine/rock interactions.
The experimental protocol will be described, as well as the methodology and the analyses
needed to quantify the effect of the CO2 reactivity, i.e. the characterization of the rock
specimen before and after the percolation.
First results, obtained on calcareous sandstone and on fluvial sandstones will be presented. A
monitoring of the permeability/porosity changes linked to the precipitation/dissolution
reactions as well as the chemical evolution of the outlet fluids was done. A test of isotopic
tracing using the δ13C (dissolved CO2) fingerprints of the outlet fluids has also been
performed; it demonstrates the interest of using isotopic tracers to complete the
informations given by the reactive percolation experiment and to isotopically monitor the
precipitation/dissolution processes.
A comparison between experimental and modelling results has also been performed using
a reactive-transport numerical tool TOUGHREACT.
The modelling of the CO2-saturated brine’s injection through a rock specimen has
highlighted a good matching between the measured and modelled poroperm properties
changes in response to the CO2 reactivity. |
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