A new type of wet gas online flow meter based on dual slotted orifice plate

In view of the current technical problems existing in multiphase flow metering, slotted orifice-couple flow meter was introduced and the basic principles for measurement were presented. A new wet gas flow meter is developed based on the dual slotted orifice. The flow characteristic of liquid flowing through dual slotted orifice plate, relationship of differential pressure between the dual slotted orifice plate, pressure, temperature, and flow rate of gas/liquid of different aperture ratio were studied. The mathematical measurement model applicable to the dual slotted orifice plate flow meter measurement system was established. The model was applied to onsite experiment and the calibration of China National Center of Metrology at Daqing Oil field. The results showed that the maximum measurement error of the gas phase flow was less than 10% and that of the liquid phase flow was less than 15%. The measurement accuracy of this industrial prototype can meet requirement of practical production.