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Title: Measurement Of Water In A Wet Gas
Author: Arnstein Wee Lex Scheers
Source: 2009 North Sea Flow Measurement Workshop
Year Published: 2009
Abstract: Accurate measurement of liquids in a wetgas stream is a complex and challenging task. Acceptable performance in detection of extremely small liquid volumes requires a highly sensitive measurement system. Furthermore, measurement of water fractions is particularly important since it has a direct impact on scale, hydrate and corrosion management in long pipelines on the seabed. Water measurement is conversely, the most challenging one since water typically constitutes the smallest volume fraction. Water volume fractions may be as low as 0.001 % of the total volume in the pipe. In order to perform accurate measurement of water, the measurement principle must be repeatable over time and able to sense small variations in the water content. Furthermore, the measurement principle must be able to tolerate significant variations in the hydrocarbon PVT properties. Operationaly, regular measurement of PVT properties is both expensive and time consuming and low dependence on sampling is desirable for the overall success of the measurement system. The dominating configuration parameter for measurement of the phase that occupies the smallest volume fraction is the PVT properties of the dominating phase. Hence, in order to achieve reliable water measurements in wetgas, it is critical that the system be tolerant to changes in the gas PVT properties.

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