Projeto de um circuito experimental para avaliar o desempenho de uma bomba centrífuga operando com CO2 supercrítico

Abstract

The discovery of the pre-salt fields has brought great possibilities for the national oil industry, however, in addition to these benefits, great challenges have come, such as those posed by the unwanted presence of CO2 in high concentrations in the aforesaid fields. A possible solution to this is the separation of the gas phase rich in CO2 (at high pressures) while still on the seabed. This saves both on piping costs and optimizes the fluid separation space at the platform. An ordinary form of using this excessive CO2 is through its reinjection on the oil fields, as a secondary and tertiary oil recovery method. The reinjection of CO2 is usually performed through compressors, however, with the severe conditions at the seabed, this would require a set of high capacity compressing equipments, increasing the production costs. In this context, the present work aims to study the feasibility of using a multistage centrifugal pump to operate with supercritical CO2 (since it presents relatively low temperature and critical pressure), as it is more compact and economical than a compressor. Therefore, it is necessary to undertake the study of the theory pertinent to the dimensioning of the experimental circuit, describing the governing equations, explaining the simplifying hypotheses and its application on the scenario in question. Thus, the methodology developed in this work aims to provide subsidies for an implementation-to-be, in order to obtain the specifications of each component of the experimental circuit.