METHOD FOR MULTIPHASE METERS CALIBRATION IN OPERATING CONDITIONS Russian patent published in 2014 - IPC E21B47/10 G01F25/00 

FIELD: oil and gas industry.

SUBSTANCE: invention is related to oil industry and may be used for calibration of multiphase meters in operating conditions of oil wells. The method includes division of the well product into gas and liquid components. Measurement of the liquid component rate is made by in-series reference Coriolis acceleration flow meter and the calibrated multiphase meter. Measurement of the gas component rate is made by a gas flow meter. For each of the set values for oil well rate pressure drop ΔP_i is measured at the calibrated multiphase flow meter at different values of the volume flow Q_ri of gas component and/or mass flow rate Q_mi. The obtained values of the oil well product rate - Q_ri and Q_mi and respective pressure drop values ΔP_i are recorded to memory of the controller of the calibrated multiphase flow meter. In process of operation the calibration flow rate factors for the well are specified. When the difference between the compared preset values exceeds the absolute measurement error by the multiphase flow meter then Q_mi and Q_ri values are accepted as the reference values.

EFFECT: improving determination accuracy for factors of the calibrated multiphase flow meter and ensuring on-line control and correcting of its readings in operating conditions of oil wells.

1 dwg