Evaluation of the Influence of Water Content in Oil on the Metrological Performance of Oil Flow Measurement Systems

Augusto Proença da Silva and Elcio Cruz de Oliveira ()
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Augusto Proença da Silva: Processing, Measurement and Chemicals, Exploration and Production, Petrobras S.A., Rio de Janeiro 20231-030, Brazil
Elcio Cruz de Oliveira: Postgraduate Program in Metrology, Pontifical Catholic University of Rio de Janeiro, Rio de Janeiro 22451-900, Brazil

Energies, 2024, vol. 17, issue 10, 1-20

Abstract: According to current Brazilian regulations, if the volumes of oil produced used as a reference for the payment of government shares and third parties contain a water content greater than 2% v / v , these volumes must be arbitrarily increased between 1.44% and 10.89% due exclusively to water content, which has caused operational problems for oil companies such as differences between volumes produced and volumes sold, and additional payments from government shares and third parties. This study aimed to evaluate the metrological performance of oil measurement systems with ultrasonic, Coriolis and positive displacement flow meters when subjected to varied water content, fluid temperature and flow rate conditions using the Design of Experiments and the Response Surface Methodology. The analysis of variance showed that the models presented good fits for the ultrasonic meter (coefficient of determination R 2 of 97.96%, p -value of 0.001, and a standard deviation of 5.89 × 10 ?5 ); Coriolis meter (R 2 of 90.91%, p -value of 0.037, and a standard deviation of 5.88 × 10 ?5 ); and positive displacement meter (R 2 of 99.07%, p -value of 0.000, and a standard deviation of 4.85 × 10 ?5 ). 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 measurement technology used by the flow meter. However, the fluid temperature proved to be a relevant parameter common to all flow measurement technologies evaluated. All measuring technologies evaluated were influenced by water content in the range of 0% to 10% v / v , with the measurement error being less than 0.2% when compared to a standard positive displacement type meter in almost all experimental conditions. The Coriolis-type flow meter was the one that presented the smallest error among the measuring technologies evaluated.

Keywords: flow metering; water content; Box–Behnken Design; Response Surface Methodology; positive displacement meter; ultrasonic meter; Coriolis meter (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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