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Title: Using An Ultrasonic Flowmeter In The Transition Zone
Author: David Mills, Julien Porre
Source: 2016 North Sea Flow Measurement Workshop
Year Published: 2016
Abstract: Liquid flow measurement is essential throughout the oil and gas industry. Ideally a flow measurement system would have high turndown an d low measurement uncertainty, maintained over the complete flow rang e. Unfortunately velocity based meters such as turbine and ultrasonic meters can sh ow significantly degraded linearity at low flows. Provided the measurements are repeatable this non-linearity can be defined and corrections applied in order to maintain a good turndown. If repeatability is not good, the overall uncertainty of measurement will be worse at the low flow end and may not be acceptable. This will result in much higher costs for metering as more meter tubes will be required t o cover the overall flow range. These turndown effects become more and more signifi cant as viscosity increase

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