Device and method for multiphase flow meter calibration using a closed loop multiphase flow system

A device for calibration of a multiphase flow meter comprising

• a separation vessel for separating oil, gas and water phases, comprising a first compartment for containing the oil-and-water mixture to be separated, a second compartment for containing the oil phase already separated, and a gas chamber common to both of said compartments,
• an oil pipeline comprising feeding means for providing oil to said second compartment from a stock oil tank, a water pipeline comprising feeding means for providing water to said first compartment from a stock water tank,
• a gas pipeline comprising feeding means for providing gas from a stock gas tank,
• an oil pipeline comprising outlet means for producing an oil stream out of said separation vessel and setting and metering means for metering said oil stream flow rate,
• a water pipeline comprising outlet means for producing a water stream out of said separation vessel and setting and metering means for metering said water stream flow rate,
• a gas pipeline comprising outlet means for producing a gas stream out of said separation vessel and setting and metering means for metering said gas stream flow rate,
• a collecting pipeline for collecting said oil, gas and water streams into one oil, gas and water stream and feeding means for feeding back the oil, gas and water stream into the separation vessel,
• a multiphase flow meter to be calibrated connected to said oil, gas and water stream, producing flow rate measurement data,
• a calibrating system for processing measurement data from the oil stream, the gas stream and the water stream, and the oil, gas and water stream flow meters and obtaining a corresponding correction factor for the multiphase flow meter to be calibrated;
• the separation vessel further comprising control means for controlling the oil-water interface level in said first compartment within a predetermined range and control means for controlling the oil level in said second compartment within a predetermined range.