Experimental and numerical simulation of the injection of a CO2 saturated solution in a carbonate reservoir: application to the CO2 -DISSOLVED concept combining CO2 geological storage and geothermal heat recovery

Abstract : This study was conducted in the framework of the CO2-DISSOLVED project (Kervévan et al., 2013, 2014), funded by the ANR (French National Research Agency). The CO2-DISSOLVED project proposes to assess the feasibility of a novel CO2 injection strategy in deep saline aquifers, combining injection of dissolved CO2 (instead of supercritical CO2) and recovery of the geothermal heat from the extracted brine. This approach relies on the geothermal doublet technology (commonly used in the Paris Basin, France), where the warm water is extracted at the production well and the cooled brine re-injected in the same aquifer via a second well (injection well). As a consequence, the amount of CO2 that can be injected in the geothermal aquifer is physically limited by CO2 solubility in brine. For that reason and unlike the standard approach (supercritical CO2) which focuses on very large CO2 emitters (ca. > 1 Mt/yr), the CO2-DISSOLVED concept targets specifically low tonnage emitters (ca. 10-150 kt/yr) compatible with a local single doublet facility. Injecting CO2-rich acidified water is expected to induce an enhanced reactivity at the immediate vicinity of the injection well, particularly in presence of carbonated minerals. Similarly, acidified water will be much more aggressive for the well casing and cement than standard cold brine in classical geothermal doublets. However, since this injection option has been much less studied than the standard injection of supercritical CO2, we need to improve our knowledge on these aspects. The work presented in this paper is devoted to fill this gap using a dedicated experimental facility.
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Communication dans un congrès
13th International Conference on Greenhouse Gas Control Technologies, GHGT-13, Nov 2016, Lausanne, Switzerland. 2016
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A Randi, Jérôme Sterpenich, Dominique Thiéry, Christophe Kervévan, Jacques Pironon. Experimental and numerical simulation of the injection of a CO2 saturated solution in a carbonate reservoir: application to the CO2 -DISSOLVED concept combining CO2 geological storage and geothermal heat recovery. 13th International Conference on Greenhouse Gas Control Technologies, GHGT-13, Nov 2016, Lausanne, Switzerland. 2016. 〈hal-01327324〉

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