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Étude de la réactivité de minéraux purs en présence de CO2 supercritique : mesure de la cinétique de carbonatation de la portlandite

Abstract : The efficiency on the long term of CO2 geological storage will rely on trapping mechanisms and good sealing properties of the caprock and the eventual access wells. A series of experiments has been devised to observe and quantify the reactivity of portlandite with supercritical CO2. The portlandite has been chosen as a key component of calcium-rich cement for its interest in borehole cement degradation. Initial carbonation rates have been measured under different conditions : pressure 160 bar, temperatures 80, 120, and 200°C and with various amount of water. SEM observations show that the reacting fluid state (absence or presence of liquid phase) controls strongly the carbonation behaviour and the reaction path. A specific geochemical model has been developed in order to account for the particular conditions of our experiments. These results (portlandite carbonation rate and water-poor geochemical system modelling techniques) should be useful to simulate wellbore cement degradation.
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Submitted on : Thursday, July 24, 2008 - 8:00:00 AM
Last modification on : Wednesday, October 14, 2020 - 3:52:20 AM
Long-term archiving on: : Saturday, November 26, 2016 - 7:20:36 PM

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  • HAL Id : pastel-00004063, version 1

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Olivier Regnault. Étude de la réactivité de minéraux purs en présence de CO2 supercritique : mesure de la cinétique de carbonatation de la portlandite. Planète et Univers [physics]. École Nationale Supérieure des Mines de Paris, 2008. Français. ⟨NNT : 2008ENMP1536⟩. ⟨pastel-00004063⟩

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