Determinação da pressão ótima de separação de fluidos de reservatório utilizando o simulador de processos ASPEN – HYSYS.

Abstract

In order to maximize the profits obtained from the exploration of oil reservoirs, it is essential that the primary separation of the fluids was done as efficiently as possible. Thus, choosing the separation pressure that maximizes a density API and minimizes formation volume and a gas-oil ratio becomes a key factor during the primary separation process of the produced fluids. In this work, the Aspen-HYSYS process simulator was used to find the optimum point of separation for three reservoir fluids. Firstly, was made an evaluation of the accuracy of the Peng-Robinson, Soave-Redlich-Kwong, Chao-Seader and Grayson-Streed thermodynamic packages available in the simulator comparing the simulation results with experimental results available in the literature to determine witch model would generate the smallest percentage relative error.The four models presented similar behavior to the behavior of the experimental data. The optimum fluid separation pressure was calculated using the Grayson-Streed thermodynamic model, which showed the smallest relative errors. The pressures obtained were shown to be higher for the fluids that had the highest amount of gas.