Patent ID: 11971382
Assignee: ROXAR FLOW MEASUREMENT AS
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A system for measuring the composition of a multiphase fluid flow in a pipe, the multiphase flow containing a mixture of gas and liquid, the system comprising:
a first and a second sensor arrangement, each including at least two electrodes positioned in the pipe, wherein each sensor arrangement is adapted to measuring electrical impedance of the flow at a predetermined rate wherein the two sensor arrangements are configured to have different sensitivity fields, thus responding differently to an inhomogeneous distribution within their respective sensing regions but similar to homogeneous flow composition; and
an analysis unit adapted to:
monitor the measured electrical impedance from the first and second sensor arrangement;
calculate the ratio between the two measurements for each time step;
select all measurements within a defined time window in each of the measurements with a ratio being essentially 1:1;
detect measurements of the selected measurements with the highest impedance at both sensor arrangements representing a virtual liquid sample with low gas content; and
calculate the composition based on the detected highest-impedance measurements, thus providing a measure of the water liquid ratio (WLR) in the virtual liquid sample.