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Title: Subsea Multiphase Fluid Analyzer Mufa() A- New Concept To Provide Accurate Fluid Parameter Input To Multiphase Flow Meters
Author: Kjetil Folger, Jan Kocbach, Kjetil Haukalid, Anders Hallanger, Marie Bueie Holstad, Eirik bro, Audun Faanes, Asbjrn Erdal
Source: 2019 North Sea Flow Measurement Workshop
Year Published: 2019
Abstract: Multiphase flow meters (MPFMs) rely on accurate knowledge of fluid parameters such as densities and dielectric parameters in order to calculate flow rates with good accuracy. Uncertainties and variations over time in the composition can lead to large uncertainty in the estimated fluid parameters. Uncertainty in fluid parameters is a main contributor to the overall uncertainty of multiphase flow measurements.In this paper we present a new concept for a subsea multiphase fluid analyzer (MuFA), in whichthe fluid parameters are measured directly at operating conditions using an add-on module to the MPFM. Thus, accurate input parameters are provided that will increase the reliability and accuracy of MPFMs. The functionality of the MuFA concept is to sample the multiphase flow into a subsea chamber, let the fluids separate within the chamber, and measure the fluid parameters of the three phases directly at operating conditions. The fluids are released into the multiphase flow after characterization. The concept has been verified by multiphase flow loop experiments over a broad range of flow conditions applying electromagnetic sensors and a gamma densitometer. A control system for automated sampling and analysis of the three fluid phases has been implemented and tested.

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