Pulsed nuclear magnetism tool for formation evaluation while dri

Details Pulsed nuclear magnetism tool for formation evaluation while dri Pulsed nuclear magnetism tool for formation evaluation while dri

1996-03-28

1998-01-06

O'Shea, Sandra L.

Electricity: measuring and testing

Particle precession resonance

Using well logging device

G01V 332

Patent

active

057059276

ABSTRACT:
The instruments of a pulsed nuclear magnetic resonance (NMR) device are included in a drill collar for evaluating earth formations. The resulting tool makes NMR measurements while the formation is being drilled. Permanent magnets produce a static field in the earth formation. Shimming permanent magnets inside or outside the drill collar suppress the magnetic resonance of borehole fluids. The permanent magnets are manufactured from two magnetic materials, for example.

REFERENCES:
patent: 4710713 (1987-12-01), Strikman
patent: 4792757 (1988-12-01), Vail, III et al.
patent: 4949045 (1990-08-01), Clark et al.
patent: 5280243 (1994-01-01), Miller

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