Method and Apparatus for Measuring Wet Gas Utilizing an Augmented Coriolis Flow Meter

A method of determining a mass flow rate of liquid within a fluid flow, comprising:

• using a Coriolis flow meter having one or more flow tubes to measure a density of a fluid flow passing within the one or more flow tubes;
• determining a measure of gas wetness of the fluid flow using the measured density of the fluid flow, an expected gas density value based on a measured pressure value of the fluid flow and/or a measured temperature value of the fluid flow, and an equation of state model;
• determining a differential pressure measurement across at least one of the one or more flow tubes of the Coriolis flow meter using a differential pressure flow meter;
• determining an over-reading of the differential pressure measurement due to wetness;
• determining a mass flow rate of gas within the fluid flow using the over-reading of the differential pressure measurement;
• and
• determining a mass flow rate of liquid within the fluid flow using an estimate of the wetness and the measured mass flow rate of gas within the fluid flow.

An apparatus, comprising:

• a Coriolis flow meter having one or more flow tubes, the Coriolis flow meter configured to determine a density of a fluid flow passing through the one or more flow tubes;
• a SONAR flow meter having an array of sensors disposed on at least one of the one or more flow tubes;
• and
• a processing unit in communication with Coriolis flow meter and the SONAR flow meter, and a non-transitory memory storing instructions, which instructions when executed cause the processing unit to:
• measure a density of the fluid flow passing within the one or more fluid flow tubes of the Coriolis flow meter using the Coriolis flow meter;
• determine a measure of gas wetness of the fluid flow using the measured density of the fluid flow, an expected gas density value based on a measured pressure value of the fluid flow and/or a measured temperature value of the fluid flow, and an equation of state model;
• determine a convective velocity measurement of the fluid flow using the SONAR flow meter;
• determine an over-reading of the convective velocity measurement due to wetness using the determined convective velocity measurement;
• determine a mass flow rate of gas within the fluid flow using the over-reading of the convective velocity measurement;
• and
• determine a mass flow rate of liquid within the fluid flow using an estimate of the wetness with the measured mass flow rate of gas within the fluid flow.

A Coriolis flow meter, comprising:

• a pair of flow tubes;
• a differential pressure flow meter configured to determine a measurement of differential pressure of fluid flow across at least one of the flow tubes;
• an array of sensors installed on at least one of the flow tubes, the sensors configured to determine a measurement of a convective velocity of the fluid flow passing through the respective at least one of the flow tubes;
• and
• a processing unit in communication with the differential pressure meter and the array of sensors, and a non-transitory memory storing instructions, which instructions when executed cause the processing unit to use the measurement of differential pressure of fluid flow, the measurement of convective velocity, and at least one of a model of over-reading due to wetness of the differential pressure measurement or a model of over-reading due to wetness of the convective velocity measurement to determine at least one of a gas mass flow rate or a liquid mass flow rate through the Coriolis flow meter.