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Vol. 191, Issue 8, August 2015, pp. 1-11

 

Bullet

 

Cyclonic Capacitive Sensor for Multiphase Composition Measurement
 

Javier ORTIZ, Vlastimil MASEK

Memorial University of Newfoundland, A1B 3X9, Canada

Received: 6 July 2015 /Accepted: 30 July 2015 /Published: 31 August 2015

Digital Sensors and Sensor Sysstems

 

Abstract: A Cyclonic Capacitive Sensor is proposed for real time multiphase composition measurement with a characteristic suitable for offshore installations. The sensor makes a novel use of an electrostatic technique that takes advantage of a non-linear distribution of phase-interfaces in a cyclonic multiphase flow stratifier. The novel sensor consists of a stack of ring electrodes confined into a cyclone-type phase stratifier. The capacitance detected at each ring electrode pair is a function of the phase volumetric fraction, the temperature and chemical composition dependent phase permittivities and the physical dimensions of the ring electrodes. If the number of electrodes is made proportional to the number of unknown parameters, a complete set of linearly independent equations can be established to resolve the desired parameters, mainly the composition. The robustness of such sensor can be improved by adding a redundant electrode pair. Analytical, numerical and experimental analyses are presented.

 

Keywords: Offshore Oil&Gas, Produced water, Multiphase flow regime, Phase stratification, Hydrocyclone.

 

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