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Title: Testing Of The Red Eye Near-Infrared Water Cut Monitor In High Gvf Multiphase Flow Conditions
Author: Andrew Hall, John Lievois, Babajide Adejuyigbe
Source: 2007 South East Asia Flow Measurement Conference
Year Published: 2007
Abstract: successfully applied to measurement of small quantities of water in a variety of media, such as paper, methanol, tobacco, etc. The Red Eye 2G water cut monitor was developed to exploit the very characteristic attenuation of infra-red light by water as a means to measure the water cut in mixtures of oil and water. The water cut monitor uses four specific NIR wavelengths to provide a capability for water cut measurement across the full range from 0% to 100%. The monitor was known to operate reliably in the presence of a small quantity of free gas (up to 20%) from previous tests, and the purpose of this new test programme was to evaluate the capability of the instrument to operate in much higher gas volume fraction environments. This paper presents new data obtained in three test campaigns at the TUV NEL multiphase flow facility. The tests spanned the full range of water cuts from 0% to 100%, at a range of fluid mixture velocities, and with gas volume fractions in the 60% to 95% range. Most tests were for meters in a horizontal orientation, but some additional tests were included in vertical flow. The results exceeded expectations of water cut measurement uncertainty at these high gas fraction conditions, with very little dependence of the uncertainty on GVF.

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