| Autor: |
Mbouombouo, C. I. R., Djotsa, V. N. N., Fokam, C. B., Mambou, L. L. N., Kamgang, H. T., Mamadou, P. B. |
| Zdroj: |
International Journal of Energy and Water Resources; 20240101, Issue: Preprints p1-19, 19p |
| Abstrakt: |
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 CO2from the results obtain. |
| Databáze: |
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