Metering system for three-phase oil flow in horizontal pipeline

摘要

An apparatus, method and non-transitory computer readable medium method are described for identifying the phase fractions and flow-rate of a petroleum carrying pipeline with three-phase wavy-stratified flow. A set of semi-cylindrical electrodes are mounted on the internal surface of a pipe to monitor the total capacitance and resistance of the three-phase contents. The phase fractions are determined by relating the resistance and capacitance to the phase-angles associated with the interfaces between water, oil and gas phases of the mixture. To calculate the flow rate, measured capacitances from two sets of electrodes with known separation distance are cross-correlated to determine time delay. Communications circuitry transmits the measurements to a remote control center for monitoring. Calculated and measured results demonstrate close agreement. The percentage error exhibited by the proposed inclined capacitive plate technique is calculated and compared with published values.