Electricity: measuring and testing – Particle precession resonance – Using well logging device
Patent
1998-02-20
2000-02-08
Arana, Louis
Electricity: measuring and testing
Particle precession resonance
Using well logging device
324318, G01V 300
Patent
active
060231645
ABSTRACT:
A method and apparatus are described using nuclear magnetic resonance (NMR) measurements for obtaining information relating to properties of geologic structures in highly conductive borehole environments. A centralized NMR logging probe is provided with a sleeve having a semi-circular RF shield that blocks signals from one side of the probe and with elements that press the uncovered side of the probe to the sidewall of the borehole. In highly conductive boreholes, the eccentrically-positioned modified probe results in increased signal-to-noise ratios and savings in peak power and energy compared with the use of standard centralized tools. The modified probe further suppresses unwanted NMR signals.
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Arana Louis
Numar Corporation
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