Nuclear magnetism logging method and apparatus

Details Nuclear magnetism logging method and apparatus Nuclear magnetism logging method and apparatus

G - Physics

01

V

324/1.2

G01V 3/32 (2006.01)

Patent

CA 1138042

ABSTRACT A nuclear magnetism logging system and method is disclosed in which a surface unit provides power to, control of, and signal reception from a downhole sonde. The surface unit comprises a source of alternating current power and a switching circuit for applying a sequence of alternating current waveforms from the alternating current power source to a surface transformer, each waveform in the sequence starting and stopping with substantially zero amplitude. The switching circuit memorizes the starting and stopping polar- ity of the one waveform in the sequence, and starts and stops the next wave- form in the sequence of waveforms with polarities opposite that of the mem- orized starting and stopping polarities of the one waveform in the sequence. The downhole sonde of the system has a transformer, the primary coil of which is electrically connected to the secondary coil of the surface transformer. A rectifier circuit is connected to a polarizing-receiving coil during the polarizing time of the polarizing-receive cycle. A receiving amplifier is connected to the polarizing-receiving coil during the receiving time of the polarizing-receive cycle. Receiver and recording circuits in the surface unit receive and record the downhole signals from the receiving amplifier. Timing circuitry controls a downhole switching circuit for alternating the connection of the polarizing-receive coil to the rectifier and the receiving amplifier.

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