Published As:
US8489244
Title:
METHOD, CONTROLLER AND SYSTEM FOR CONTROLLING THE SLUG FLOW OF A MULTIPHASE FLUID
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US8489244
Priority Date
26
Mar
10
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Abstract:
A method of controlling the flow of a multiphase fluid through a pipeline that includes a riser pipe with a choke valve comprises receiving multiple signals dependent on fluid flow properties from a plurality of sensors in the topside area of the riser pipe, analysing the signals to establish a vector of measurement weights, the product of the vector of measurement weights and a corresponding vector of the signal values of a given time being dependent on the severity of a slug flow forming in the system. Further signals dependent on fluid flow properties are received from the plurality of sensors in the topside area of the riser pipe. A set position for the choke valve is then determined from the product of the vector of measurement weights and further values of signals to restrict characteristics of the flow in the topside from moving towards a severely slugging flow regime.
Claim 1:
The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows: 1. A method of controlling the flow of a multiphase fluid through a pipeline of the kind in which a riser pipe is fitted with a choke valve which can be moved between an open position in which fluid can flow through the choke valve and a more closed position in which the flow of fluid through the valve is at least partially choked, the method comprising the steps of: in a first stage receiving multiple signals dependent on fluid flow properties from a plurality of sensors in the topside area of the riser pipe, analysing the signals to establish a vector of measurement weights derived from sampled values of the multiple signals, the product of the vector of measurement weights and a corresponding vector of the signal values of a given time being dependent on the severity of a slug flow forming in the system at that time, and in a second stage receiving further signals dependent on fluid flow properties from the plurality of sensors in the topside area of the riser pipe, in a third stage determining a set position for the choke valve from the product of the vector of measurement weights and the further values of signals, and moving the choke valve to the set position in order to restrict characteristics of the flow in the topside from moving towards a severely slugging flow regime.