Development of a multiphase composition measurement method by using capacitive sensor array
2015
Multiphase flow, a flow of two or more liquid/gas components, is present in many
industries. One of the challenges is to measure accurately the volumetric/mass ratio of
each component against the total volume/mass. In the oil and gas industry, this kind
of measurement is performed on a regular basis. Since the early 1980s, many methods
have been proposed for multiphase flow measurement and some are commercially
available today. However, these sensors often depend on a separator to isolate each
phase, or use a homogenizer/mixer to achieve consistent solutions, or employ Gamma-
Ray radiation provided by a nuclear source. The approach used in this research is to
combine a sensor with an integrated cyclonic stratifier that transforms diverse flow
regimes of multiphase flow into a channel flow regime. The sensor employs a relatively
simple capacitive sensor array and allows for accurate measurements of phase fractions
in real time. The system is also capable of compensating for drift in parameters such
as permittivity, often caused by a changed chemical composition, e.g. the level of
sulphur in the oil, the salinity of water, or due to variable temperature.
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