Nuclear magnetic resonance apparatus and method

Details Nuclear magnetic resonance apparatus and method Nuclear magnetic resonance apparatus and method

1996-02-23

1998-01-27

O'Shea, Sandra L.

Electricity: measuring and testing

Particle precession resonance

Using well logging device

G01V 314

Patent

active

057125660

ABSTRACT:
A nuclear magnetic resonance apparatus including a magnet generating a static magnetic field in a first region containing materials to be analyzed. The magnet generates zero static magnetic field in a second region. The magnet has generally homogeneous magnetization along a longitudinal axis and is magnetized substantially perpendicular to the axis. The apparatus includes means for generating a radio frequency magnetic field in the first region for exciting nuclei of the materials. The means for generating the radio frequency magnetic field includes an antenna disposed within the second region. The apparatus includes means for receiving a nuclear magnetic resonance signal from the excited nuclei. The means for receiving also provides an output indication of properties of the materials to be analyzed. In a preferred embodiment, the means for generating and receiving include an antenna at least partially disposed within the second region. In a specific embodiment, the antenna consists of wire coils wound in planes perpendicular to the longitudinal axis. A high permeability ferrite is disposed inside the wire coils.

REFERENCES:
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patent: 4710713 (1987-12-01), Strikman
patent: 4717877 (1988-01-01), Taicher et al.
patent: 5055787 (1991-10-01), Kleinberg et al.
patent: 5280243 (1994-01-01), Miller
M. N. Miller et al, "Spin Echo Magnetic Resonance Logging: Porosity and Free Fluid Index Determination" paper No. 20561, Society of Petroleum Engineers, Richardson, TX (1990).

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