Method and apparatus for determining the velocity and properties of flowing fluids using nuclear magnetic resonance measurements

摘要

A method of determining a property of a flowing fluid by nuclear magnetic resonance, comprising: applying a static magnetic field to the flowing fluid; Detecting a sequence of magnetic resonance measurements of the flowing fluid using a pulse sequence including a destruction pulse, a waiting time and a detection pulse sequence, the sequence of magnetic resonance measurements having different values for the waiting time; and fitting the sequence of nuclear magnetic resonance measurements to a forward model for responses of the flowing fluid to derive a flow velocity and / or longitudinal relaxation times of the flowing fluid.