Abstract
To thoroughly investigate the stability of reservoir rock mass in heavy oil thermal recovery projects, this study explored the dynamic mechanical properties and deformation behaviors of thermally-treated red sandstone from the oil-immersed reservoir, taking the dry and water-saturated reservoirs as the comparison. The results show that the dynamic compression strength and energy transmission rate of oil-immersed and thermally-treated red sandstone are enhanced. With the help of scanning electron microscopy (SEM) tests, we observed the grain-coating on the surface of the mineral particles of oil-immersed rock. The grain-coating enhances the rock matrix integrity and leads to the mechanical strengthening effect of oil-immersed rock. The fractal dimension of oil-immersed samples is smaller than that of dry and water-saturated samples. In addition, the theoretical values of the damage constitutive model are consistent with the experimental data, which verifies the validity of the damage model. Our new findings support that the oil weakens the deformation resistance ability of the micro-crack part but strengthens that of the rock matrix.
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