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
046460179
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 coil circuit while guarding against the effects of tuning errors in the latter, viz., using a higher Q value than normal or its equivalent for the coil circuit during the initial stages of ringing of the coil at the proton precession frequency followed by establishing a lower Q value for the latter stages. Result: the effect is as if ringing is at the higher Q' value with attendent zeroing of the residual polarization, but without the consequences of slow cutoff of the decaying magnetic field introduced during ringing. Hence, the effect of error fields associated with the latter is minimized.
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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