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Enhanced oil recovery (EOR) processes are important to the petroleum industry. In the EOR, gases such carbon dioxide (CO2) and natural gas are injected in the petroleum reservoirs for oil recovering. It is well known that the interfacial tension between the injected gas and the oil has influence on the efficiency of displacement of oil by gas. When the injected gas becomes miscible with the oil, it is displaced with efficiency, resulting in high recoveries. In this study, an experimental setup is established to measure the dynamic and equilibrium interfacial tensions (IFT) of the Brazilian crude oil + CO2 system under various conditions using the pendant drop technique. This experimental technique is used to determine the interfacial tension of the above system at different pressures and temperatures. The measured IFT data will provide a better understanding of the interfacial interactions between the crude oil and CO2 and, consequently, to improve the economics of the gas injection process.

MEDIDAS DE TENSÃO INTERFACIAL EM ALTAS PRESSÕES PARA O SISTEMA CO2 – PETRÓLEO BRASILEIRO