This dissertation aimed to evaluate the metrological performance of oil measurement systems with ultrasonic, Coriolis and positive displacement flowmeters when subjected to various conditions of BSW, fluid temperature and flow rate by using Design of Experiments and Response Surface Methodology. According to current Brazilian regulations, if the produced oil volumes used as a reference for the payment of government takes and to landowners contain a BSW greater than 2 percent v/v, these volumes must be arbitrarily increased by 1.44 percent up to 10.89 percent due exclusively to the BSW value, which has caused operational problems for oil companies such as differences between the produced oil volumes and oil volumes sold, and additional payments of government takes and landowner fees. The results of the experiments carried out indicate that the contribution of each parameter analyzed to the metrological performance of the measurement system varies depending on the flowmeter measurement technology, however, the fluid temperature proved to be a relevant parameter common to all measurement technologies evaluated. All measurement technologies evaluated are influenced by BSW in the range of 0 percent to 10 percent v/v, with the measurement error being less than 0.2 percent, when compared to positive displacement master flowmeter, in almost every experimental condition. The Coriolis flowmeter was the one with the lowest error among all measurement technologies evaluated.