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Title: The Effects Of Salinity Variation On Dual Energy Multiphase Flow Measurements And Mixmeter Homogeniser Performance In High Gas And High Viscosity Operation
Author: P. Harrison, S.J. Parry, G.L. Shires
Source: 1999 North Sea Flow Measurement Workshop
Year Published: 1999
Abstract: It is a continuing concern of those involved with multiphase flow meters using dual energy X-ray/gamma phase fraction measurement that changes in the properties of the fluids being measured will cause errors. Density changes are accommodated through known PVT relations but changes in the chemical composition of the flowing fluids must be corrected for if errors are to be avoided. While significant changes in overall hydrocarbon composition are not usually encountered, salinity of the water fraction can vary over time for some wells and this changes not only the physical density but also the mass absorption of the water. In the first part of this paper the effects of fluid property changes on dual energy measurements are discussed in relation to the energy levels most commonly used for measurement. The second part of the paper presents recent results from the Mixmeter homogeniser which continues to demonstrate excellent characteristics as a differential pressure meter in multiphase flow. Data for high gas fraction operation is presented together with work using high viscosity emulsions.

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