Estudo do processo de injeção de vapor aplicado em reservatórios de óleo pesado, usando poços verticais

Abstract

One of the great difficulties faced by the oil industry is called production in reservoirs with heavy oils, since these due to their high viscosity make the flow of the oil a difficult task. In order to mitigate this obstacle, thermal methods are adopted. These are intended to increase the temperature of the reservoir, consequently the temperature of the oil, through the transfer of heat it will reduce the viscosity of the oil. One of the most widely used thermal methods worldwide is the injection of steam, precisely because it is an effective and economically viable method when compared to other methods. This method was used in this work, more specifically, the continuous steam injection. In addition, in this work, analyzes were performed with different well configurations, five-spot pattern and inverted five-spot pattern, as well as studies were done for different flow rates of steam injection. The computational tools used for simulation were the WinProp and the Builder of the Computer Modeling Group (CMG), in which the fluid model and the reservoir model were created, respectively. Besides these, the STARS, which is directed to the thermal methods, was used for the simulation of the built models. In the performed analyzes, properties such as viscosity and oil saturation were investigated. Therefore, the aim of this study was to determine the best response to the method applied to this reservoir, and it was concluded that cases 1, inverted five-spot pattern with 25 producing wells and 13 injection wells, the case 5, inverted five-spot pattern with 30 producing wells and 16 injectors, and case 6, five-spot pattern with 16 producing wells and 30 injectors, obtained good results, however a study of economic viability is necessary to define, in fact , which is the best model.