Computer-linked nuclear magnetic logging tool and method having slowly rising polarizing field turn-on segments for rapidly dispersing precessing components of residual polarization associated with a prior-in-time NML collection cycle
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United States of America Patent
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Feb 24, 1987
Grant Date -
N/A
app pub date -
Jul 31, 1985
filing date -
Jul 31, 1985
priority date (Note) -
Expired
status (Latency Note)
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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.
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