Radial NMR well logging apparatus and method

Details Radial NMR well logging apparatus and method Radial NMR well logging apparatus and method

1997-10-29

1999-09-28

Barlow, John

Electricity: measuring and testing

Particle precession resonance

Using well logging device

324303, 324309, 324318, 324322, 324307, 600410, 600419, 600422, G01V 300

Patent

active

059594535

ABSTRACT:
A nuclear magnetic resonance sensing apparatus, including a magnet for inducing a static magnetic field within materials to be analyzed. The magnetic field is substantially coaxial with a longitudinal axis of the apparatus. The magnetic field is polarized substantially perpendicularly to the longitudinal axis and is symmetric about the axis. The static magnetic field has a maximum longitudinal gradient which is inversely related to a speed of motion of the apparatus along the longitudinal axis through the materials to be analyzed. The apparatus includes a transmitter for generating a radio frequency magnetic field in the materials for exciting nuclei in the materials. The radio frequency magnetic field is substantially orthogonal to the static magnetic field. The apparatus includes a receiver for detecting nuclear magnetic resonance signals from the excited nuclei in the materials. In a preferred embodiment, the magnet comprise magnetized cylinders stacked along the longitudinal axis. The magnetization of each of cylinder is proportional to its distance from a center plane of the magnet. The cylinders are magnetized parallel to the longitudinal axis and towards the center plane. The preferred embodiment of the magnet includes an end magnet disposed at each longitudinal end of the stacked cylinders. The end magnets are each magnetized parallel to the longitudinal axis and in a direction opposite to the magnetization of an adjacent one of the cylinders.

REFERENCES:
patent: 4717876 (1988-01-01), Masi et al.
patent: 5055787 (1991-10-01), Kleinberg et al.
patent: 5332967 (1994-07-01), Shporer

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