TOUGH-RFPA: Coupled thermal-hydraulic-mechanical Rock Failure Process Analysis with application to deep geothermal wells

نویسندگان

چکیده

This paper presents a coupled thermal-hydraulic-mechanical (THM) model for simulating failure processes in geological media. The coupling between stress/strain and heat transfer describing how thermal expansion affects stress is based on the theory of thermo-elasticity. Additionally, fluid flow pore-pressure governed by Biot's consolidation theory. Stress/strain-dependent porosity/permeability/capillary-pressure defines influence fields. THM implemented solver module that links multiphase, multicomponent simulator TOUGH2 with geomechanical RFPA (Rock Failure Process Analysis), which concept heterogeneity leads to non-linearity progressive behavior. Capability TOUGH-RFPA was verified two benchmark problems related hydraulic-mechanical thermal-mechanical response hollow cylinder. Then applicability demonstrated modeling cooling-induced damage around very deep geothermal well mesoscopic heterogeneous properties, showed complex evolution fracturing during cooling pressurization.

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ژورنال

عنوان ژورنال: International Journal of Rock Mechanics and Mining Sciences

سال: 2021

ISSN: ['1873-4545', '1365-1609']

DOI: https://doi.org/10.1016/j.ijrmms.2021.104726