Modelagem de injeção de agua acima da pressão de fratura do reservatorio atraves de poço horizontal virtual / Modeling water injection above reservoir formation parting pressure through a virtual horizontal well

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

Water injection has been the most used method to improve oil recovery. The main problem of this method, related directly with operational efficiency, is the injectivity loss which is the loss of capacity to maintain water injection rates due to formation damage. Different models have been proposed to minimize the injectivity loss effects due to its high economic impact on oil production. One of these methods is water injection above formation parting pressure. It consists in creating high conductivity channels inside the reservoir to restore or to increase well injectivity. This method has advantages associated with injectivity maintenance but it is difficult to model and it presents uncertainties in relation to sweep efficiency, to fracture tip behavior and its influence on the water re-circulation. One way to model the problem is the integration of geomechanical and flow simulation, but it requires a higher computation time and it has not been completely implemented in commercial simulators. Different techniques are used to model the water injection above formation parting pressure, such as transmissibility modifiers associated with local grid refinement. In this work, a methodology is proposed for fracture simulation using both numerical fluid flow and geomechanical simulators, coupled explicitly, using a virtual well to model the fracture. Initially, injectivity loss is modeled and, along with geomechanical fracture model, transmissibility modifiers are used to model the fracture. This model represents the reference fracture model. Then, the fracture is represented by a virtual horizontal well, allowing easy implementation into commercial simulators. The results show that the virtual horizontal well represents adequately the fracture s behavior given by the reference model, avoiding local grid refinement and, allowing full field scale simulations without simulation grid modification

ASSUNTO(S)

reservatorios - fratura reservatorios numerical reservoir simulation mecanica de rochas engenharia de reservatorio de oleo water injection simulação (computadores) injectivity loss geomechanics

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