Problems of numerical simulation of fields' development using commercial simulation software
The data presented in some recent papers indicate significant divergence in numerical solutions obtained, using different commercial simulation software, and on regular and irregular grids with different cell sizes. The present paper analyzes the causes of such divergence associated both with general features of numerical simulation algorithms for single- and multiphase flow processes in porous media and peculiarities of their implementation in the simulation software. The problem of solution convergence is addressed for reducing grid cells and time step sizes. Special consideration is given to simulation of fluid inflow to wells of different types, principles of grid construction and refinement, necessity of a reservoir parameters and fluid upscaling/downscaling when changing to coarser or finer grids and to the influence of numerical algorithms tuning. Practical suggestions are presented for achievement of credible results using commercial simulation software.