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Thermodynamique de stockage souterrain de fluides : Application aux cavités salines

Abstract : In the current energy transition context, ongoing projects intend to temporarily store underground new fluid products (CO2, O2, H2). Their thermodynamic features may differ from those of the commonly stored products in such facilities, whether their own behavior is considered or their interactions with the other species remaining in the reservoir (brine, insoluble materials, NaCl cristal). This work aims to model a salt cavern storage to highlight the thermodynamic properties most impacting the storage behavior the most and influencing the choice of the monitoring process. For this purpose, the modeling of the storage behavior of these new products is compared to the already validated one, achieved on a comparable reference product (here the CH4).This work more specifically focuses on taking into account the mass transfers occuring between the stored fluid and the brine phases. This requires to use more complex equations of states to thermodynamically characterize of the newly considered mixtures and to adapt the equations of the global storage model to incorporate the mass exchanges between the fluid phases, as well as the heat transfers these phenomena induce. Two special aspects are addressed on the mass transfers : on the one hand, their impact on the evolution of the storage conditions, considering the thermodynamic equilibrium at any time, and, on the other, their kinetic evolution. To illustrate these two points, experimentally and numerically, CO2 is observed, due to its relatively high solubility in brine, and compared to CH4, which, inversely, hardly dissolves in it.
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Submitted on : Monday, September 28, 2020 - 12:29:41 PM
Last modification on : Wednesday, October 14, 2020 - 4:13:50 AM

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  • HAL Id : tel-02950856, version 1

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Aurélien Soubeyran. Thermodynamique de stockage souterrain de fluides : Application aux cavités salines. Mécanique des fluides [physics.class-ph]. Université Paris sciences et lettres, 2020. Français. ⟨NNT : 2020UPSLM009⟩. ⟨tel-02950856⟩

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