Abstract
Understanding and mastering the stability of underground storage is significant for improving safety operations in deep formations, this implies the investigation of stress state with geomechanical coupled processes. This paper focuses on the variation of in situ stress and the hydromechanical impact on reservoir stability. The Mohr–Coulomb criteria was used to evaluate the failure zones for the study of the four reservoirs stabilities. The MATLAB programing software was used for its accuracy and optimization ability, to implement the geomechanical model and simulate the reservoir effect. The numerical results obtained show that, the assessment throughout the in situ stress state increases with depth up to 15,000 m at its basement with a pore pressure at its bottom of 6.5 MPa, the minimum horizontal stress is 68.75 MPa, the maximum Horizontal stress gives 165 MPa and a vertical stress of 206.26 MPa. For the stability estimation, the first reservoir named Stuttgart gives the shear stress τ = 5 MPa, with the normal stress σn = 18 MPa, the stability factor is f = 0.4579 from the stress estimation, and its pressure breakdown is Pb = 8.87 MPa, with a flow rate of Q = 0.00071 m3/s for carbon dioxide injected. Other reservoirs are estimated the same with the safety zone given, setting Stuttgart and Rotiliegend to be good formations for underground storage from the interpretations done. This paper also compared two fluids for injection with water leading over CO2 from the results obtain.
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The authors are thankful for the reviewer’s grateful comments, that really helped to enhance this paper’s content. The authors are grateful to submit and publish our article in the International Journal of Energy and Water Resources. I disclose to funding information, for the manuscript submitted for publication. The authors are open for eventual note that could hopefully enhanced the work done.
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Funding was provided by University of yaounde I (grant no. +237690357326).
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As corresponding author, I hereby declare that all authors contributed to the study concept and design. The data collection and analysis were performed by Cherif Ibrahim Rengou Mbouombouo, Victorien Ngninjio Nguimeya Djotsa, Harold Tcheliebou Kamgang, Pascal Bachirou Mamadou, Christian Bopda Fokam and Leroy Luc Ngueyep Mambou. The first draft of the manuscript was written by Cherif Ibrahim Rengou Mbouombouo and all authors commented on previous version. I confirm that, this work was approve by the authors listed in the manuscript. The authors authorized the submission for publishing the manuscript. I confirm that all the authors have consented, read and approve the manuscript
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Mbouombouo, C.I.R., Djotsa, V.N.N., Fokam, C.B. et al. Modeling the impacts of hydro-mechanical coupled processes on reservoir stability and permeability. Int J Energ Water Res (2024). https://doi.org/10.1007/s42108-024-00281-4
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DOI: https://doi.org/10.1007/s42108-024-00281-4