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Thermodynamic Modeling of Mutual Solubilities in Gas-Laden Brines Systems Containing CO 2 , CH 4 , N 2 , O 2 , H 2 , H 2 O, NaCl, CaCl 2 , and KCl: Application to Degassing in Geothermal Processes

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  • Salaheddine Chabab

    (Laboratoire de Thermique, Energetique et Procédés (LaTEP), University of Pau and Pays de l’Adour, Rue Jules Ferry BP 7511, CEDEX, 64075 Pau, France)

  • José Lara Cruz

    (Laboratoire de Thermique, Energetique et Procédés (LaTEP), University of Pau and Pays de l’Adour, Rue Jules Ferry BP 7511, CEDEX, 64075 Pau, France)

  • Marie Poulain

    (Laboratoire de Thermique, Energetique et Procédés (LaTEP), University of Pau and Pays de l’Adour, Rue Jules Ferry BP 7511, CEDEX, 64075 Pau, France)

  • Marion Ducousso

    (Laboratoire de Thermique, Energetique et Procédés (LaTEP), University of Pau and Pays de l’Adour, Rue Jules Ferry BP 7511, CEDEX, 64075 Pau, France)

  • François Contamine

    (Laboratoire de Thermique, Energetique et Procédés (LaTEP), University of Pau and Pays de l’Adour, Rue Jules Ferry BP 7511, CEDEX, 64075 Pau, France)

  • Jean Paul Serin

    (Laboratoire de Thermique, Energetique et Procédés (LaTEP), University of Pau and Pays de l’Adour, Rue Jules Ferry BP 7511, CEDEX, 64075 Pau, France)

  • Pierre Cézac

    (Laboratoire de Thermique, Energetique et Procédés (LaTEP), University of Pau and Pays de l’Adour, Rue Jules Ferry BP 7511, CEDEX, 64075 Pau, France)

Abstract

With the growing interest in geothermal energy as a renewable and sustainable energy source, nowadays engineers and researchers are facing technological and environmental challenges during geothermal wells’ operation or energy recovery improvement by optimizing surface installations. One of the major problems encountered is the degassing of geothermal brines which are often loaded with dissolved gases, resulting in technical problems (scale formation, corrosion, reduced process efficiency, etc.) and environmental problems through the possible emission of greenhouse gases (CO 2 , CH 4 and water vapor) into the atmosphere. In this work, a method to predict, from readily available information such as temperature and GLR, the bubble point pressure of geothermal fluids as well as the GHG emission rate depending on the surface conditions is presented. This method is based on an extended version of the Soreide and Whitson model with new parameters optimized on the solubility data of several gases (CO 2 , CH 4 , N 2 , O 2 and H 2 ) in brine (NaCl + CaCl 2 + KCl). The developed approach has been successfully used for the prediction of water content of different gases and their solubilities in different types of brines over a wide temperature and pressure range, and has been applied for the prediction of bubble point pressure and GHG emissions by comparing the results with available industrial data of geothermal power plants including the Upper Rhine Graben sites.

Suggested Citation

  • Salaheddine Chabab & José Lara Cruz & Marie Poulain & Marion Ducousso & François Contamine & Jean Paul Serin & Pierre Cézac, 2021. "Thermodynamic Modeling of Mutual Solubilities in Gas-Laden Brines Systems Containing CO 2 , CH 4 , N 2 , O 2 , H 2 , H 2 O, NaCl, CaCl 2 , and KCl: Application to Degassing in Geothermal Processes," Energies, MDPI, vol. 14(17), pages 1-22, August.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:17:p:5239-:d:620870
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    References listed on IDEAS

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    4. Pan, Shu-Yuan & Gao, Mengyao & Shah, Kinjal J. & Zheng, Jianming & Pei, Si-Lu & Chiang, Pen-Chi, 2019. "Establishment of enhanced geothermal energy utilization plans: Barriers and strategies," Renewable Energy, Elsevier, vol. 132(C), pages 19-32.
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