Cavern integrity for underground hydrogen storage in the Brazilian pre-salt fields |
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| Affiliation: | 1. Department of Civil and Environmental Engineering, Pontifical Catholic University of Rio de Janeiro, 225 Marquês de São Vicente Street, Gávea, 22451-900, Rio de Janeiro, RJ, Brazil;2. Tecgraf Institute/PUC-Rio, 225 Marquês de São Vicente Street, Gávea, 22451-900, Rio de Janeiro, RJ, Brazil;1. State Key Laboratory of Coal Mine Disaster and Control, Chongqing University, Chongqing 400044, China;2. College of Resources and Environmental Sciences, Chongqing University, Chongqing 400044, China;3. State Key Laboratory of Rock and Soil Mechanics and Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China;4. Mackay School of Earth Sciences and Engineering, University of Nevada, Reno, NV, USA;1. Tecgraf Institute – Pontifical Catholic University of Rio de Janeiro (PUC-Rio), Brazil;2. Department of Civil and Environmental Engineering, PUC-Rio, Brazil;1. Ruhr-Universität Bochum, Chair of Foundation Engineering, Soil and Rock Mechanics, Universitätsstr. 150, 44780 Bochum, Germany;2. Institute of Mechanics, Bulgarian Academy of Sciences, Sofia, Bulgaria;1. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, 400044, China;2. Institute of Rock and Soil Mechanics and Engineering, Chinese Academy of Sciences, Wuhan, 430061, China |
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| Abstract: | Over the years, energy has depended on petroleum-based fuels. However, global warming and the energy crisis have drastically impacted the markets. It urges investing in renewable energy resources, such as hydrogen. Therefore, this work focuses on the hydrogen storage process in salt caverns, as these rocks have relevant properties, such as low permeability, relevant creep, and self-healing. A workflow for cavity integrity analysis is proposed. Hydrogen storage provokes variations in temperature and pressure inside the cavern. The gas thermodynamics is represented through a diabatic solution, which updates the gas pressure and temperature at each time step. The thermomechanical formulation is implemented into an in-house framework GeMA, which couples different physics. Four case studies are analyzed, and the discussions compared mechanical and thermomechanical models. Results demonstrate the importance of thermal effects, as temperature amplitudes may compromise rock integrity, for instance, inducing tensile stresses and affecting permeability. |
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| Keywords: | Hydrogen storage Creep Salt cavern Thermo-mechanical analysis |
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