Formulação adaptativa composicional de reservatórios de petróleo utilizando malhas não-estruturadas baseada em elementos

Abstract

An oil and gas reservoir is a complex system due to its dimensions, internal structure and the fluids that flow through it. Modeling such structure is not an easy task and it can become costly in terms of computational effort. In order to reduce this expenditure, adaptative formulations can be implemented. These formulations provide the reduction in the implicitness level of mesh while ensuring the numerical stability required. The present work describes the implementation of an adaptative formulation in a simulator, from compositional type, of oil reservoir. The research is applied to 2D unstructured grids using Element-based Finite Volume Method (EbFVM). For the purpose of validate the new implementations, three case studies are tested and the acquired results are compared with the results from other formulations already in use in the simulator. The oil and gas production curves serve to attest the accuracy and precision of the implemented methodology and the simulation time data are used to prove the advantage of the new method. In adaptative method, the computational effort required is lower, however, the reliable simulation results are still maintained.