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

摘要

A method of determining a characteristic of a flowing fluid by nuclear magnetic resonance, including applying a static magnetic field to the flowing fluid; detecting a sequence of nuclear magnetic resonance measurements of the flowing fluid using a pulse train including a kill pulse, a wait time, and a sense pulse train, the sequence of nuclear magnetic resonance measurements having different wait time values; and adjusting 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.