Abstract
Massive CO 2 injection into subsurface formation involves interactions among pressure and temperature change, chemical reactions, solute transport, and the mechanical response of the rock. This is a coupled thermal-hydraulic-mechanical-chemical (THMC) process. Numerical modeling of CO 2 injection around the wellbore area can provide information, such as changes in rock properties, as well as stress and pressure changes. This helps better predict injectivity evolution and leakage risk. In this paper, finite element methods are employed to analyze the transient stress, pressure, temperature and chemical solute concentration changes simultaneously around an injection well. Particularly, the stabilized finite element scheme is used to overcome these numerical oscillations in solving the transient advection-diffusion equations involved in the heat transfer and solute transport processes. Finite element analysis of stress and pressure changes in the rock around a wellbore subjected to thermal and chemical effects will be shown in a numerical experiment.
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