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Title: Multiphase Metering Using a Dual Frequency Coriolis Mass Flow Meter
Author: Sakethraman Mahalingam, Hao Zhu, Liyun Lao
Source: 2021 North Sea Flow Measurement Workshop
Year Published: 2021
Abstract: Coriolis meters are used on the liquid line coming out of many first-stage separators to measure the mass flow rate of the produced hydrocarbon liquid. In addition to the mass flow rate, the liquid density from the meter is conveniently interpreted as a water-cut measurement. However, given that many of these separators are at least a decade old, they are often operating outside of their design specifications and may have gas carry-under issues. In many cases, the Gas Volume Fraction (GVF) may be as much as 25% on the liquid line while they are designed to have less than 1% GVF. Unfortunately, many of Coriolis meters on these separators today are unable to tolerate a GVF of even 5%. When most of the time, the gas is present as free bubbles, in some cases, it may be trapped within the oil. There is a big need for getting accurate and reliable flow measurements from these facilities to enable proper reservoir management 1.

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