Brittleness and Fracability Evaluation of Unconventional Reservoirs

Yuan (Daniel) Hu



This presentation shows that for brittle rocks, the larger the energy dissipation during the process, the smaller the fragments after rock failure. For plastic rocks, the energy consumption of plastic deformation should be considered. Energy like elastic strain energy, plastic dissipation energy, equivalent fracture energy, and internal energy can be calculated by using FE method. An increase in confining pressure increases ultimate stress and thus increase the time before rock failure. The magnitude of damage energy determines the rock fragmentation degree.