NUMERICAL SIMULATOR FOR NATURALLY FRACTURED RESERVOIRS USING PERMEABILITY TENSORS AND TIME DEPENDANT FACTORS

Understanding the behavior of Naturally Fractured Reservoirs (NFR) has been one of the biggest challenges assumed by many researchers worldwide working in the field of reservoir characterization, modeling and simulation. Due to the high number of NFRs around the world and consequently the significant quantity of oil and gas contained within them, these reservoirs are a very attractive target for the oil industry. However, due to the degree of complexity involved in their modeling, they require a considerable investment of both time and money. Construction of a numerical simulation tool that implements two more recent technological concepts namely tensor permeability and time dependant form factors have a great impact when modeling more realistically the NFR performance. SIMYNF is able to characterize permeability in the three dimensions of the fractured system and the inter-porous flow present in matrix-fracture systems; based on finite differences for black oil reservoir with double porosity and/or double permeability, three phases, three dimensions, Darcy’s flow and isothermic conditions. It is capable of modeling vertical, horizontal and deviated wells; simulate recovery mechanisms such as gas in solution, water thrust, gravity segregation and imbibition mechanisms.