Electricity: measuring and testing – Particle precession resonance – Using well logging device
Patent
1997-01-29
1998-09-29
Arana, Louis M.
Electricity: measuring and testing
Particle precession resonance
Using well logging device
324322, G01V 300
Patent
active
058149880
ABSTRACT:
An apparatus for measuring induction resistivity and nuclear magnetic resonance properties of earth formations penetrated by a wellbore. The apparatus includes a magnet for inducing a static magnetic field in the formations, a transmitter antenna positioned proximal to the magnet and having a principal magnetic axis substantially perpendicular to the principal magnetic field direction of the magnet. The apparatus includes receiver antennas positioned at spaced apart locations from the transmitter antenna, a circuit for generating radio frequency power pulses which is selectively connected to the transmitter antenna, and circuits for measuring the voltages induced in both the transmitter antenna and induced in the receiver antennas. The measuring circuit is adapted to measure voltages in the receiver antennas during the radio frequency power pulses, when the voltages are induced in the receiver antennas by electromagnetic induction. The measuring circuit is also adapted to measure voltages induced in the transmitter antenna between successive power pulses, when the voltages are induced therein by nuclear magnetic resonance.
REFERENCES:
patent: 5280243 (1994-01-01), Miller
patent: 5451873 (1995-09-01), Freedman et al.
patent: 5710511 (1998-01-01), Taicher et al.
patent: 5712566 (1998-01-01), Taicher et al.
Forgang Stanislav
Itskovich Gregory B.
Arana Louis M.
Fagin Richard A.
Western Atlas International Inc.
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