We proposed, in this work, an experimental and numerical study of mechanical behavior of shale rocks subjected to mechanical and thermal loads.In the petroleum industry, during the production of heavy oil with the technique of steam water injection at high temperature, the cap rocks are subjected to coupled thermal and hydro-mechanical solicitations. The challenge is to study the hydro-mechanical behavior of these materials subject to large variations in temperature in order to assess the mechanical stability of the reservoir. The experimental study includes the modifications in a triaxial cell in ordre to support a high temperature (250° C). These modifications are very important for hydrostatic, uniaxial and triaxial tests, all these tests are used to obtain an experimental data base characterizing the thermal effect on the mechanical behavior of shale rocks.The modeling framework is proposed at first to describe the mechanical behavior of shale rock in isotropic case. After a detailed analysis of experimental data obtained in the experimental section, a specific coupled elastoplastic-damage model has been developed to describe the mechanical behavior of these shale materials. The effect of temperature is taken into account and a comparison between numerical simulations and experimental data have shown the ability of the proposed model for the description of thermo mechanical coupling. To describe the behavior of anisotropic rocks, we have proposed an extension of the fabric tensor model to present the initial anisotropy of shale rock. This formulation is expressed in terms of invariant stress tensor coupled with loading orientation. Laboratory tests under different stress paths were modeled, the proposed model seems able to describe correctly the main mechanical responses of shale materials
University of Lille.
2010.
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