Computer-linked nuclear magnetic logging tool and method having

Details Computer-linked nuclear magnetic logging tool and method having Computer-linked nuclear magnetic logging tool and method having

1985-07-31

1987-02-24

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Using well logging device

324311, G01R 3320

Patent

active

046460217

ABSTRACT:
The present invention decreases the time needed between collection cycles of a NML tool located in a wellbore penetrating an earth formation by zeroing the effect of prior-in-time residual polarization via a surprising change in the operating parameters, viz., generating the next-in-time polarizing field with a slow-rising turn-on segment for scattering precessing components of residual polarization thereabout. Result: cyclic NML logging speed can be greatly improved.

REFERENCES:
patent: 3135912 (1964-06-01), Baker et al.
patent: 3289072 (1966-11-01), Schuster
patent: 3402344 (1968-09-01), Brown et al.
patent: 3617867 (1971-11-01), Herzog
patent: 3667035 (1972-05-01), Sliohter
patent: 4528508 (1985-07-01), Vail, III

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