Measuring and testing – Volume or rate of flow – Using differential pressure
Reexamination Certificate
2007-05-29
2007-05-29
Patel, Harshad (Department: 2855)
Measuring and testing
Volume or rate of flow
Using differential pressure
Reexamination Certificate
active
11311090
ABSTRACT:
A method, system, controller and computer program product, for controlling the flow of a multiphase fluid comprising gas and liquid in a conduit, which conduit is provided at a downstream side with a flow restriction and a valve having a variable aperture, which method comprises the steps ofselecting a flow parameter of the multiphase fluid in the conduit as a function of a pressure difference over the flow restriction;selecting a setpoint for the flow parameter;allowing the multiphase fluid to flow at a selected setpoint of the aperture of the variable valve;determining the pressure difference over the flow restriction and determining an actual value of the flow parameter from the pressure difference, without using a measurement of another variable in order to determine an actual gas/liquid ratio pertaining to the pressure difference at the flow restriction;controlling the flow of the multiphase fluid by determining a deviation of the flow parameter from its setpoint, determining an updated setpoint for the aperture of the valve which is dependent on the deviation, and manipulating the aperture of the valve accordingly.
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European Search Report dated May 18, 2005 for EP Application 04106803.2.
Eken Adriaan Nicolaas
Haandrikman Gritienus
Seelen Marinus Gerardus Wilhelmus Maria
Hickman William E.
Patel Harshad
Shell Oil Company
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