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Title: Water-In-Liquid Probe System For Measuring Water-In-Liquid Ratio At Low And High Gas Volume Fractions
Author: Christian Dreyer Skre
Source: 1999 North Sea Flow Measurement Workshop
Year Published: 1999
Abstract: Aprototype dielectric on-line monitor for measurement of water cut in multiphase petroleum flow has been built. The system is a low cost and robust system capable of measuring 0-100% water cut at 3% uncertainty. The system has been tested successfully at gas volume fractions (GVF) ranging from 0% to 93%. The monitor is designed with a view to installation topside, subsea or downhole. The measurement concept is based on dielectric measurements of the liquid in the flow at high frequency using an open ended coaxial probe. The method utilises the complex permittivity of the fluid to calculate the water cut. The instrument consists of the dielectric sensor installed in the pipe wall, an electronic unit for measuring the complex reflection coefficient and a PC for control, signal analysis, calculation of water cut and data presentation. The sensor facilitates easy installation, e.g. similar to a pressure transducer.

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