AN ELASTOPLASTIC MULTISCALE, MULTIPHYSICS MIXED GEOMECHANICAL MODEL FOR OIL RESERVOIRS USING ADAPTIVE MESH REFINEMENT METHODS

Simulation of fluid flow and deformation of porous media are important steps in the management and development of petroleum reservoirs. Fluid flow in an oil reservoir occurs on a wide range of scales. Due to the fact that simulating with respect to all the scales in multiple physical media exceeds current computational capabilities, the multiscale multiphysics mixed geomechanical model (M(3)GM) has been recently developed. Solid deformation is important in simulation of fluid pattern, petroleum production strategy, and protection of the uppermost equipment. In this paper, an elastoplastic model is added to M(3)GM, to increase the accuracy of M(3)GM in the simulation of solid deformation. Also, the mesh dimension is refined adaptively at some parts of the solid phase, according to the density of input data and concluded results. Finally, the model predictions are compared with the other simulations, and reasonable agreements are obtained.