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Title: A HIGH-ACCURACY,CALIBRATION-FREE Multiphase Meter
Author: G.J. Miller, W. Letton, A.M. Scheers
Source: 1999 North Sea Flow Measurement Workshop
Year Published: 1999
Abstract: The need for accurate and reliable measurement of three-phase flow streams is well documented. To this end Daniel have developed a high-accuracy multiphase flowmeter MEGRA based on the sound measurement principle of (multiple energy) gamma ray absorption. The ultimate aim of such technology is to replace the measurement function of the traditional test separator with a cheaper, lower-maintenance and calibration-free alternative. At present, due to its high-accuracy water-cut (WC) and real-time performance, MEGRA has also been utilised for well management programs downstream of traditional test separators. The flow-rates of the individual water, oil and gas phases are derived from a measurement of the bulk flow through an annular Venturi, combined with phase fraction information deduced from the absorption of gamma-rays within the multiphase fluid. The gamma-ray technique has the advantage over other multiphase metering methods in that it is applicable over the full range of water-cuts from 0 - 100% and does not depend upon the nature of the emulsion present. This paper outlines the basic principles behind the multiphase flow measurement and highlights some of the advantages of the present technology. The use of relatively low-energy gamma-ray emissions and high-resolution solid-state detectors lends an enhanced sensitivity to the measurement. Consequently, water-cuts and gas volume fractions can be determined to high accuracy ( 2%) in relatively short measurement times ( seconds).

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