MULTIPHASE VENTURI FLOW METERING METHOD

A method for measuring fluid flow characteristics in a multiphase fluid stre am which passes through a venturi flow meter comprises: measuring liquid holdup (.alpha.1,I) at or near the inlet of the venturi; determining a slip factor (S) which expresses the difference between the gas and liquid velocity at a selected location in the venturi, which slip factor is based on the measured level of liquid holdup; and calculating the fluid flow characteristics on th e basis of an algorithm which takes into account the measured liquid holdup (.alpha.1,I) at the inlet of the venturi and different slip factors at the inlet (Si) and in the throat of the venturi (St).