Thermo-Poromechanical Properties of Pierre II Shale

Abstract During the injection of carbon dioxide (CO 2 ) for CO capture and storage (CCS) operations, near-well (including casing, cement, rock around it) can undergo several thermal loadings. These loadings significantly increase or decrease pore pressure thus lead to mechanical failure cement sheath formation. When these failures appear in caprock, they compromise integrity site. The understanding thermo-mechanical behaviour a potential caprock shale is, therefore, great importance success CCS operations. In this paper, experiments were performed on Pierre II shale, under confining initial pressures comparable field conditions. A 60 °C loading amplitude (between 30 90 °C) was applied material both undrained drained results, analysed within framework anisotropic thermo-poro-elasticity, highlight expansion coefficients, as well Skempton coefficient. pressurization coefficient also evaluated showed change high 0.11 MPa/°C.