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

1985-11-18

1987-02-24

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Using well logging device

324311, G01R 3320

Patent

active

046460160

ABSTRACT:
The present invention decreases the time needed between collection cycles of an 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 operations, viz., using a series of sham polarizing cycles wherein the coil circuit is permitted to ring at the series Q' values higher than the normal Q value. Result: previously non-precessing components of the residual polarization undergo precession and can be subsequently scattered by the next-in-time field. Since all of the sham fields as well as the next-in-time polarizing field are provided with slow-rising amplitude v. time turn-on segments, the precessing components of the polarization existing at the start of the build-up of the fields are easily scattered. Ultimately, all aspects of the residual polarization is destroyed whereby 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), Slichter
patent: 4528508 (1985-07-01), Vail, III

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