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
046460225
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 operations, viz., using a sham polarizing cycle wherein the coil circuits permitted to ring at a Q' value higher than normal. Result: previously non-precessing components of the residual polarization undergo precession and can be subsequently scattered by the next-in-time field. Since the sham field as well as the next-in-time polarizing field are both provided with slow-rising amplitude vs. time turn-on segments, the resulting polarization existing at the start of the buildup of the fields can be easily scattered. Ultimately, all aspects of the residual polarization are 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
Chevron Research Company
Keeling E. J.
LaPaglia S. R.
Messner H. D.
Tokar Michael J.
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