Nuclear magnetic resonance borehole logging tool

Details Nuclear magnetic resonance borehole logging tool Nuclear magnetic resonance borehole logging tool

1986-07-15

1987-12-22

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Using well logging device

324318, G01R 3320

Patent

active

047148810

ABSTRACT:
A nuclear magnetic resonance logging tool comprises spaced-apart arrays of magnets, oppositely polarized, to produce a homogeneous static magnetic field parallel to the borehole when positioned adjacent the borehole wall. Magnetic material is positioned between the arrays of magnets and the borehole fluid when the logging tool is so positioned against the borehole wall to create a weaker magnetic field within the borehole. Transmitter means produces a radio frequency polarization pulse. Receiver means detects nuclear magnetic resonance in the formation following the termination of the polarization pulse.

REFERENCES:
patent: 3289072 (1966-11-01), Schuster
patent: 3667035 (1972-05-01), Slichter
patent: 4350955 (1982-09-01), Jackson
"Nuclear Magnetic Logging", R. J. S. Brown and G. W. Gamson, Petroleum Transactions, AIME, vol. 219, 1960, pp. 199-207.
"An Improved Nuclear Magnetism Logging System and its Application to Formation Evaluation", Herrick, Couturie & Best, 1979 Annual Meeting of Society of Petroleum Engineers of AIME (SPE 8361), 1979.
"Western Gas Sands Project Los Alamos NMR Well Logging Tool Development", Brown, Jackson & Koelle, Los Alamos Scientific Laboratory Report LA-10374-PR, (Mar. 1985).

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