Estudo do simulador BOAST: avaliação de parâmetros e aplicação alternada água-gás (WAG) em reservatório de petróleo

Abstract

Besides the production control, the development of new technologies or the improvement of existing ones are some of the main reservoir engineering challenges, whose main objective is to increase oil recovery, especially when the primary recovery methods become technical and economically unfeasible. In this context, simulators are an important tool because they allow inferring the productive behavior of the reservoirs. In this work BOAST, a free, black-oil, three-dimensional and three-phase simulator, was investigated for a more comprehensive understanding itself and its applicability. A supplementary extended manual was developed based on the detailed study of this simulator, which can serve as a guide for its use or to incorporate improvements in the program code during future work. It is worth emphasizing this contribution of this work since the existing BOAST manuals are not very detailed. This work also presents in detail some case studies that exemplify the applicability of BOAST, such as: sensitivity analysis of PVT properties and input variables related to rock properties and production parameters in the reservoirs simulation; and technical evaluation of the advanced recovery method called water alternating gas injection (WAG). These studies also allowed a theoretical discussion of reservoir simulation features, for instance: efficiency, three-phase permeability, permeability hysteresis concepts and description of recovery methods such as WAG.