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Title: A High-Accuracy, Calibration-Free Multiphase Meter
Author: G.J. Miller, C.J. Alexander, F. Lynch, D.J. Thompson
Source: 1999 International Symposium on Fluid Flow Measurement
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 based on the sound measurement principle of 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 such traditional test separators. 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). A method of measuring changes in the process water salinity, which seriously affects most multiphase flow measurements, and an extension of this method to achieve full calibration-free operation in the field, is discussed.

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