Simultaneous digitizing apparatus for an acoustic tool

Details Simultaneous digitizing apparatus for an acoustic tool Simultaneous digitizing apparatus for an acoustic tool

1987-07-27

1989-02-28

Steinberger, Brian S.

Communications: electrical

Wellbore telemetering or control

Pulse or digital signal transmission

367 27, 367 79, 364422, G01V 140, G01V 116

Patent

active

048089966

ABSTRACT:
For use in an acoustic logging tool, an apparatus which digitizes simultaneously obtained acoustic signals is set forth in the preferred and illustrated embodiment. The device cooperates with N acoustic receivers in a sonde. After an acoustic pulse is transmitted, data is observed at all N acoustic receivers. This apparatus comprises a multiplexer which is connected to the several receivers. The several input signals are multiplexed, thereafter input to a digital data converter forming a procession of output digital words, and the words are stored in a selected order in a digital data buffer. They are delivered to the surface through a telemetry transmitter at a slower rate than the rate at which the data is created. In addition, a transmitter monitor is included. This provides a signal alternately digitized for a specified interval to enable coordination of the data reduction from the acoustic receivers in contrast with the timing of the transmitted acoustic pulse.

REFERENCES:
patent: 3366924 (1968-01-01), Brown
patent: 4210966 (1980-07-01), Ingram
patent: 4350979 (1982-09-01), Eberwein
patent: 4451790 (1984-05-01), Bravenec
patent: 4456983 (1984-06-01), Schoonover
patent: 4684947 (1987-08-01), Zimmer

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