The oil and gas industry’s goal of developing high performing multiphase flow metering
systems capable of reducing costs in the exploitation of marginal oil and gas reserves, especially
in remote environments, cannot be over emphasised.
Development of a cost-effective multiphase flow meter to determine the individual phase flow
rates of oil, water and gas was experimentally investigated by means of low cost, simple and
non-intrusive commercially available sensors. Features from absolute pressure, differential
pressure (axial), gamma densitometer, conductivity and capacitance meters, in combination
with pattern recognition techniques were used to detect shifts in flow conditions, such as flow
structure, pressure and salinity changes and measured multiphase flow parameters
simultaneously without the need for preconditioning or prior knowledge of either phase.
The experiments were carried out at the National Engineering Laboratory (NEL) Multiphase
facility. Data was sampled at 250 Hz across a wide spectrum of flow conditions. Fluids used
were nitrogen gas, oil (Forties and Beryl crude oil – D80, 33o API gravity) and water (salinity
levels of 50 and 100 g/l MgSO4). The sensor spool piece was horizontally mounted on a 4-inch
(102mm) pipe, and the database was obtained from two different locations on the flow loop.
The ability to learn from ‘experience’ is a feature of neural networks. The use of neural
networks allows re-calibration of the measuring system on line through a retraining process
when new information becomes available. Some benefits and capabilities of intelligent
multiphase flow systems include:
Reduction in the physical size of installations.
Sensor fusion by merging the operating envelopes of different sensors employed
provided even better results.
Monitoring of flow conditions, not just flow rate but also composition of components.
Using conventional sensors within the system will present the industry with a much
lower cost multiphase meter, and better reliability.
Comment [HS1]: I think this word
should be measured to make the sentence
read correctly
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