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Title: Parallel Calibration Of Multiphase Flow Meters Vs Separator
Author: Stig Harald Hammer Gustavsen, Torbjrn Selanger, Therese Renstrm
Source: 2019 North Sea Flow Measurement Workshop
Year Published: 2019
Abstract: In recent years, the number of marginal oil fields put into production has increased. The typical scenario is that these small fields are tied back to an existing installation that acts as host. This way of arranging production of oil and gas in a production hub makes the development of marginal fields economically viable. One challenge with this type of arrangement is that as the owner structure gets more complex, the complexity in the allocation system also increases. It is essential for a viable long-term collaboration that the produced oil and gas revenue is accurately split according to owner fraction in a transparent and robust manner.Tying the production from small surrounding fields, often called 3rdparty fields, to a host installation usually requires modifications of the process at the host installation. To achieve accurate allocation measurements, the production from each license should ideally be processed and measured isolated from the other licenses. This would require enormous investments and is not realistic. Another approach is to have a dedicated inlet separator for each license. This method provides good accuracy of production volumes, but still requires relatively large investments in addition to space and weight reserves on the host installation. The cheapest, smallest and lightest solution usually involves using Multiphase flow meters (MPFM) for allocation.The individual mass flow of the oil, gas and water phases of the production fluids from each separate field is measured by a dedicated MPFM, and allocation can be performed based on these measurements. Production from different fields can then be processed with minimum modifications of the hosts processing systems.The downside of using MPFMs for allocation is a reduction in measurement accuracy. MPFMs have been shown to drift with varying flow conditions1. To reduce the uncertainty in the MPFM measurements and ensure that the measurements are representative for the present conditions, periodic calibrations of the meters is necessary.

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