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Method of measuring multiphase flow

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TLDR
In this paper, a multi-phase flow is estimated in a flow meter having a first and a second stage by empirically deriving an algorithm for the water and gas fractions, measuring pressures within the flow meter, and estimating a total mass flow rate based on the measured pressures.
Abstract
Multi-phase flow is estimated in a flow meter having a first and a second stage by empirically deriving an algorithm for the water and gas fractions, measuring pressures within the flow meter, and estimating a total mass flow rate based on the measured pressures. A corrected total mass flow rate is calculated using a liquid/gas slip correction technique. The oil fraction can be determined from the corrected total mass flow rate and gas and water fractions.

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Citations
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References
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Patent

Flow meter for multi-phase mixtures

TL;DR: A flow meter for multiphase flows, including a holdup measuring device having a Venturi located upstream thereof and separated therefrom by a distance that results in flow through the hold up measuring device being at least partially homogenized by the effect of the Venturi on the fluids flowing therethrough as discussed by the authors.
Patent

Systems and Methods For Measuring Multiphase Flow in a Hydrocarbon Transporting Pipeline

TL;DR: In this paper, the authors present methods and systems for measuring multiphase flows in a pipeline using a combination of venturi, microwave and radiation techniques, where the pipeline is configured to transport hydrocarbons.
Patent

Two and three phase flow metering with a water cut monitor and an orifice plate

TL;DR: In this paper, a three phase meter is used to measure the oil/water/gas fractions of a multi-phase fluid flow using a fraction meter and a flow meter to calibrate flow with the fraction meter sending mixture density information to the flow meter.
Patent

Multiphase flow meter using multiple pressure differentials

TL;DR: In this paper, a flowmeter with a first pressure sensor located in a conduit and a second response sensor spaced along the conduit for measuring a second pressure differential at a second location is described.
Patent

Improved method and system for measuring multiphase flow using multiple pressure differentials

TL;DR: An improved method and system for measuring a multi-phase flow in a pressure flow meter is described in this article, where an extended venturi (114) is used and pressure of the multiphase flow is measured at three or more positions in the venturi, which define two or more pressure differentials in the flow conduit.