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Thermodynamic study of complex systems containing gas, water, and electrolytes : application to underground gas storage

Abstract : The thermodynamic study (experimental and modeling) of Gas+Water+Salt systems is of great importance, whether in an environmental context such as Carbon Dioxide Capture and Storage (CCS) or in an economic context such as Enhanced Oil Recovery (EOR) by CO2 injection, or massive reversible Underground Gas Storage (UGS) for industrial use ("Power-to-Gas" (PtG) and "Gas-to-Power" (GtP), chemical, petrochemical and pharmaceutical industries, etc.). In the context of UGS, the energy industry is interested in the gaseous energy carriers that are most in demand in the sector, such as methane (or natural gas (NG)), carbon dioxide (pure for methanation units or mixed with methane for NG storage), oxygen (for Oxy-fuel combustion units) and hydrogen (used directly or to feed methanation units). The design and optimization of storage facilities, as well as the monitoring of the temperature, pressure and quantity of gas stored in geological reservoirs (salt caverns, deep saline aquifers and depleted NG fields) and their control according to different scenarios (daily, weekly, monthly or annual storage), require knowledge of phase diagrams and more specifically gas solubility in brine, water content and also gas hydrate stability conditions during gas exploitation. For this purpose, it is essential to develop a thermodynamic model based on theoretical foundations and with a low dependence on experimental data. The objective is to be able to extrapolate the model outside the adjustment range of the parameters (temperature, pressure and brine composition) and also to transpose it to other applications. To overcome the lack of experimental data of high pressure gas (CO2, O2 and H2) solubility in brine, an experimental apparatus based on the "static-analytic" method has been adapted and used to measure gas solubility in pure water and brine. To compare/validate the new measurements, a second apparatus based on a "volumetric" technique was also used. An electrolyte equation of state (e-PR-CPA) was developed taking into account all interactions between chemical species (molecules and ions). The results of this model were compared with existing models such as those used by geochemists and in process engineering. For a better evaluation of the performance of our model, the parameters of the previously mentioned models were re-optimized by including the newly acquired data.
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Submitted on : Wednesday, June 23, 2021 - 10:46:18 AM
Last modification on : Wednesday, November 17, 2021 - 12:32:46 PM
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  • HAL Id : tel-03268414, version 1


Salaheddine Chabab. Thermodynamic study of complex systems containing gas, water, and electrolytes : application to underground gas storage. Chemical and Process Engineering. Université Paris sciences et lettres, 2020. English. ⟨NNT : 2020UPSLM069⟩. ⟨tel-03268414⟩



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