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Geological storage of CO2 in saline aquifers or depleted reservoirs requires establishing the degree of safety and efficiency of this storage operation. To do this, it is necessary to evaluate areas of weakness where CO2 leakage could occur in the vicinity of the injection well. It is important to understand the chemical (C) and hydro (H)-mechanical (M) coupling (CHM) that occurs at the various interfaces of the well. This work focuses on the numerical analysis of the CHM coupling in the interface rock cover-cement ring with a finite element program. The numerical study includes identifying the components of the hardened cement paste through a formulation and its contribution to the CHM behavior of the same in the presence of CO2. This formulation has been modified to incorporate additions of bacterial nanocellulose and glass microspheres. The results are presented as a function of changes in permeability, volumetric proportions molar quantities. The numerical study shows the advantage of the use of this type of tools for the study of possible real scenarios in CO2 injection processes in deep wells.
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