Electricity: measuring and testing – Particle precession resonance – Using well logging device
Patent
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
046460209
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 of the polarizing coil, viz., using a higher Q value than normal or its equivalent for the polarizing coil circuit during cutoff of the polarizing field and ringing of the coil at the proton precession frequency. 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), Slichter
patent: 4528508 (1985-07-01), Vail III
Chevron Research Company
Keeling E. J.
LaPaglia S. R.
Messner H. D.
Tokar Michael J.
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