Modélisation expérimentale du stockage géologique du CO2 : étude particulière des interfaces entre ciment de puits, roche reservoir et roche couverture

Abstract : In the framework of the CO2 storage, it is crucial to ensure the integrity of the solicited materials in order to guarantee the permanent confinement of the sequestrated fluids. Using experimental simulation the purpose of this work is to study the mechanisms which could be responsible for the system destabilization and could lead CO2 leakage from the injection well. The first experimental model, called COTAGES allows studying the effects of the thermal destabilisation caused by the injection of a fluid at 25°C in a hotter reservoir (submitted to the geothermal gradient). This device allows demonstrating an important matter transfer from the cold area (30°C) toward the hot area (100°C). These results highlight the importance of the injection temperature on the injectivity properties and on the possible petrophysical evolutions of the near well. The second model, called ?Sandwich?, allow studying the behaviour of the interface between caprock (COX argillite) and well cement. Indeed, interfaces between the different rock and the well materials represent a weakness area (differential reactivity, fracturing?). Batch experiments carried out with this device in presence of CO2 show the fracturing of the interface caused by the early carbonation of the cement. The third experimental model, called MIRAGES is an innovative device which allows injecting continuously CO2 in a core sample. Samples made of Lavoux limestone and well cement reproduce the injection well at 1/20 scale. Results show a partial filling of the inter-oolithic porosity close to the injection well, and also the carbonation of the cement according to an assemblage of calcite/aragonite
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Emmanuel Jobard. Modélisation expérimentale du stockage géologique du CO2 : étude particulière des interfaces entre ciment de puits, roche reservoir et roche couverture. Sciences de la Terre. Université de Lorraine, 2013. Français. ⟨NNT : 2013LORR0013⟩. ⟨tel-01749378⟩

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