METHOD OF MEASURING FLOW RATE OF MULTIPHASE FLUID BY PICKING UP NUCLEAR MAGNETIC RESONANCE (NMR) SIGNAL AND DEVICE FOR REALISING SAID METHOD Russian patent published in 2011 - IPC G01N24/08 

FIELD: physics.

SUBSTANCE: measurement the flow rate of a multiphase fluid by picking up a nuclear magnetic resonance (NMR) signal under the effect of the gradient of a magnetic field directed along the direction of flow, followed by conversion of the measured signal into a frequency spectrum is carried out by exciting nuclei only in a part of the receiver coil - inside the layer directed across the flow and characterised by low thickness compared to the size of the working area of the receiver coil along the direction of flow, where the detection time, length of the receiver coil and flow section of the pipe are such that, during signal detection time at maximum flow rate of fluids, that layer does not fall outside the working area of the said coil.

EFFECT: design of a simple and accurate method and device for measuring flow rate of a fluid in a pipe operating in a wide range of velocities and phase composition of the fluid.

8 cl, 10 dwg