Electricity: measuring and testing – Particle precession resonance – Using well logging device
Patent
1986-08-13
1988-01-05
Levy, Stewart J.
Electricity: measuring and testing
Particle precession resonance
Using well logging device
324300, 335306, G01R 3320
Patent
active
047178760
ABSTRACT:
A magnetic structure for producing a substantially uniform magnetic field in a region external to the structure. The field produced has a predetermined magnitude but with all of its first and second order partial derivatives with respect to spatial coordinates being equal to zero at any selected point within the uniform region. The structure includes a pair of elongated magnets which are magnetized along their longitudinal axis. The magnets are spaced from each other with their corresponding end poles facing each other. A pair of annular cylindrical magnets which are magnetized in a radial direction are mounted on the end faces of each of the elongated magnets. Another annular cylindrical magnet, also having its magnetization oriented in a radial direction is located on the midplane between the two elongated magnets. The combined effect of these magnets is to create a uniform toroidal field. This field is particularly suitable for use in NMR oil well logging applications.
REFERENCES:
patent: 3114876 (1963-12-01), Schuster
patent: 3213357 (1965-10-01), Brown et al.
patent: 4297637 (1981-10-01), Crooks et al.
patent: 4350955 (1982-09-01), Jackson et al.
patent: 4498048 (1985-02-01), Lee et al.
patent: 4629986 (1986-12-01), Clow et al.
A. Timur, "Pulsed Nuclear Magnetic Resonance Studies of Porosity, Movable Fluid, and Permeability of Sandstones", Journal of Petroleum Technology, Jun. '69, p. 775.
R. C. Herrick, S. H. Couterie and D. L. Best, "An Improved Nuclear Magnetism Logging System and Its Application to Formation Evaluation", SPE 8361 presented at the 54th Annual Fall Technical Conference and Exhibition of the Society of Petroleum Engineers of AIME, held in Las Vegas, Nebr., Sep. 23-26, 1979.
R. K. Cooper and J. A. Jackson, "Remote (Inside-Out) NMR. I. Remote Production of a Region of Homogeneous Magnetic Field", J. Magn. Reson. 41,400 (1980).
L. J. Burnett and J. A. Jackson, "Remote (Inside-Out) NMR. II, Sensitivity of NMR Detection for External Samples", J. Magn. Reson. 41,406 (1980).
J. A. Jackson, L. J. Burnett and J. F. Harmon, Remote (Inside-Out) NMR. III, Detection of Nuclear Magnetic Resonance in a Remotely Produced Region of Homogeneous Magnetic Field, J. Magn. Reson. 41,411 (1980).
Masi Charles G.
Miller Melvin N.
Levy Stewart J.
Numar
O'Shea Kevin D.
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