Coriolis mass flow metering for three-phase flow: A case study |
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| Affiliation: | 1. Centre for Innovation in Carbon Capture and Storage (CICCS), School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, UK;2. Interconnector (UK) Ltd, 8th Floor, 61 Aldwych, London, WC2B 4AE;3. Institute of Petroleum Engineering, Heriot-Watt University, Edinburgh EH14 4AS, UK;1. University of Twente, Faculty of Engineering Technology, P.O. Box 217, 7500AE Enschede, The Netherlands;2. DEMCON Advanced Mechatronics, Enschede, The Netherlands;3. Bronkhorst High-Tech B.V., Ruurlo, The Netherlands;1. Instituto de Engenharia Nuclear (IEN), Divisão de Radiofármacos (DIRAD) Rua Hélio de Almeida, 75, Zip code 21941-906, Cidade Universitária, RJ, Brazil;2. Universidade Federal do Rio de Janeiro, Programa de Engenharia Nuclear (UFRJ / PEN), Avenida Horácio Macedo, 2030, Bloco G - Sala 206, Zip code 21941-914, Cidade Universitária, RJ, Brazil;3. Universidade Federal do Rio de Janeiro, Laboratório de Instrumentação Nuclear – (UFRJ / LIN), Centro de Tecnologia (CT), Bloco I, Sala I-133, Zip code 21941-972, Cidade Universitária, RJ, Brazil;1. School of Control and Computer Engineering, North China Electric Power University, Beijing, 102206, PR China;2. School of Engineering and Digital Arts, University of Kent, Canterbury, Kent, CT2 7NT, UK;3. KROHNE Ltd., Wellingborough, NN8 6AE, UK |
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| Abstract: | Previous work has described the use of Coriolis mass flow metering for two-phase (gas/liquid) flow. As the Coriolis meter provides both mass flow and density measurements, it is possible to resolve the mass flows of the gas and liquid in a two-phase mixture if their respective densities are known. To apply Coriolis metering to a three-phase (oil/water/gas) mixture, an additional measurement is required. In the work described in this paper, a water cut meter is used to indicate what proportion of the liquid flow is water. This provides sufficient information to calculate the mass flows of the water, oil and gas components. This paper is believed to be the first to detail an implementation of three-phase flow metering using Coriolis technology where phase separation is not applied.Trials have taken place at the UK National Flow Standards Laboratory three-phase facility, on a commercial three-phase meter based on the Coriolis meter/ water cut measurement principle. For the 50 mm metering system, the total liquid flow rate ranged from 2.4 kg/s up to 11 kg/s, the water cut ranged from 0% to 100%, and the gas volume fraction (GVF) from 0 to 50%. In a formally observed trial, 75 test points were taken at a temperature of approximately 40 °C and with a skid inlet pressure of approximately 350 kPa. Over 95% of the test results fell within the desired specification, defined as follows: the total (oil+water) liquid mass flow error should fall within ±2.5%, and the gas mass flow error within ±5.0%. The oil mass flow error limit is ±6.0% for water cuts less than 70%, while for water cuts between 70% and 95% the oil mass flow error limit is ±15.0%.These results demonstrate the potential for using Coriolis mass flow metering combined with water cut metering for three-phase (oil/water/gas) measurement. |
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