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Title: Multiphase Flow Measurement System Of High-Gor Applications
Author: Harry Cellos
Source: 1999 North Sea Flow Measurement Workshop
Year Published: 1999
Abstract: This paper presents the findings from an installation at Prudhoe Bay which was started up on October 22, 1998. This system consists of a MFI Multiphase Meter, a partial separation separator and a coriolis effect flow meter. The separator is used to widen the operating envelope of the multiphase meter. The control of the separator, data acquisition and final calculations are done by the MFI Meter. Since the system has a very wide operating envelope it can be used on groups of wells with widely divergent flow rates. This particular system is designed for accurate flow measurements with GORs up to 80 000 scf/bbl and it can handle liquid flow rates in the range 100-15 000 bbl/d. The accuracy of the oil flowrate is typical within 5% and the gas flow rate is measured within 2-3%. The key element of the system is the MFI multiphase flow meter which is used to measure the multiphase flow in the liquid leg of the compact separator. Unlike most well test systems, the measurements of the liquid line are not adversely affected by gas carry under. In fact, it works best with gas flowing in the liquid line. Operation and control of the system is greatly simplified by the fact that the primary goal of the separator is to remove the liquid from the gas. The separator is designed to remove down to 5 ppm over the full range of flow rates. The excitation voltage of the coriolis meter is used to detect carryover down to 2-3 ppm. This variable is also used in the control logic and changes the vapor leg flow rate to eliminate carryover.

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