Wet gas measurement
View Patent ↗A multi-phase process fluid is passed through a vibratable flowtube. Motion is induced in the vibratable flowtube. A first apparent property of the multi-phase process fluid based on the motion of the vibratable flowtube is determined, and an apparent intermediate value associated with the multi-phase process fluid based on the first apparent property is determined. A corrected intermediate value is determined based on a mapping between the intermediate value and the corrected intermediate value. A phase-specific property of a phase of the multi-phase process fluid is determined based on the corrected intermediate value.
1. A method comprising:
passing a multi-phase process fluid through a vibratable flowtube;
inducing motion in the vibratable flowtube;
determining a first apparent property of the multi-phase process fluid based on the motion of the vibratable flowtube;
determining an apparent intermediate value associated with the multi-phase process fluid based on the first apparent property;
determining a corrected intermediate value based on a mapping between the apparent intermediate value and the corrected intermediate value; and
determining a phase-specific property of a phase of the multi-phase process fluid based on the corrected intermediate value.
2. The method of claim 1 , wherein the mapping is a neural network.
3. The method of claim 2 , further comprising:
determining that the apparent intermediate value is within a first defined region of values prior to determining the corrected intermediate value; and
determining that the corrected intermediate value is within a second defined region of values prior to determining the phase-specific property of a phase of the multi-phase process fluid.
4. The method of claim 1 , wherein the multi-phase process fluid is a wet gas.
5. The method of claim 4 , wherein
the multi-phase process fluid includes a first phase and a second phase,
the first phase includes a non-gas fluid, and
the second phase includes a gas.
6. The method of claim 4 , wherein the multi-phase process fluid includes
a first phase including a first non-gas fluid, and
a second phase including a second non-gas fluid, and
a third phase including a gas.
7. The method of claim 1 , wherein determining the first apparent property of the multi-phase process fluid includes determining a second apparent property of the multi-phase process fluid.
8. The method of claim 7 , wherein the first apparent property of the multiphase process fluid is a mass flow rate and the second apparent property is a density.
9. The method of claim 1 further comprising receiving one or more measurements corresponding to an additional property of the process fluid.
10. The method of claim 9 wherein
the additional property of the multi-phase fluid includes one or more of a temperature of the multi-phase fluid, a pressure associated with the multi-phase fluid, and a watercut of the multi-phase fluid; and
determining an apparent intermediate value associated with the multi-phase process fluid based on the first apparent property includes determining the intermediate value based on the first apparent property and the additional property.
11. The method of claim 1 , wherein determining an apparent intermediate value associated with the multi-phase process fluid based on the first apparent property includes determining a volume fraction associated with an amount of non-gas fluid in the multi-phase process fluid and a volumetric flow rate of the multi-phase fluid.
12. The method of claim 1 , wherein determining an apparent intermediate value associated with the multi-phase process fluid based on the first apparent property includes determining a first Froude number corresponding to a non-gas phase of the multi-phase fluid and a second Froude number corresponding to a gas phase of the multi-phase fluid.
13. The method of claim 1 , wherein determining a phase-specific property of a phase of the multi-phase process fluid based on the corrected intermediate value includes determining a mass flow rate of a non-gas phase of the multi-phase fluid.
14. A flowmeter comprising:
a vibratable flowtube, the flowtube containing a multi-phase fluid;
a driver connected to the flowtube and configured to impart motion to the flowtube such that the flowtube vibrates;
a sensor connected to the flowtube and configured to sense the motion of the flowtube and generate a sensor signal; and
a controller to receive the sensor signal and configured to:
determine a first apparent property of the multi-phase process fluid based on the motion of the vibratable flowtube;
determine an apparent intermediate value associated with the multi-phase process fluid based on the first apparent property;
determine a corrected intermediate value based on a mapping between the apparent intermediate value and the corrected intermediate value; and
determine a phase-specific property of a phase of the multi-phase process fluid based on the corrected intermediate value.
15. The flowmeter of claim 14 , wherein the mapping is a neural network configured to determine an error in the intermediate value resulting from the presence of the multi-flow process fluid.
16. The flowmeter of claim 14 , wherein the controller is further configured to:
determine that the apparent intermediate value is within a first defined region of values prior to determining the corrected intermediate value; and
determine that the corrected intermediate value is within a second defined region of values prior to determining the phase-specific property of a phase of the multi-phase process fluid.
17. The flowmeter of claim 14 , wherein the multi-phase process fluid is a wet gas.
18. The flowmeter of claim 14 , wherein determining the first apparent property of the multi-phase process fluid includes determining a second apparent property of the multi-phase process fluid.
19. The flow meter of claim 14 , wherein the first apparent property of the multiphase process fluid is a mass flow rate and the second apparent property is a density.
20. The flowmeter of claim 14 wherein the controller is further configured to receive one or more measurements corresponding to a second apparent property of the process fluid.
21. The flowmeter of claim 14 , wherein determining an apparent intermediate value associated with the multi-phase process fluid based on the first apparent property includes determining a first Froude number corresponding to a non-gas phase of the multi-phase fluid and a second Froude number corresponding to a gas phase of the multi-phase fluid.
22. A flowmeter transmitter comprising:
at least one processing device; and
a storage device, the storage device storing instructions for causing the at least one processing device to:
determine a first apparent property of the multi-phase process fluid based on the motion of the vibratable flowtube;
determine an apparent intermediate value associated with the multi-phase process fluid based on the first apparent property;
determine a corrected intermediate value based on a mapping between the apparent intermediate value and the corrected intermediate value; and
determine a phase-specific property of a phase of the multi-phase process fluid based on the corrected intermediate value.
23. The transmitter of claim 22 , wherein the multi-phase process fluid is a wet gas.
24. The transmitter of claim 22 , wherein the storage device further stores instructions for causing the at least one processing device to receive one or more measurements corresponding to a second apparent property of the process fluid.
25. The transmitter of claim 22 , wherein determining an apparent intermediate value associated with the multi-phase process fluid based on the first apparent property includes determining a first Froude number corresponding to a non-gas phase of the multi-phase fluid and a second Froude number corresponding to a gas phase of the multi-phase fluid.