Swept energy source acoustic logging system

Details Swept energy source acoustic logging system Swept energy source acoustic logging system

G - Physics

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G01V 1/40 (2006.01) G01H 5/00 (2006.01) G01V 1/37 (2006.01) G01V 1/44 (2006.01)

Patent

CA 1161151

ABSTRACT OF THE DISCLOSURE An acoustic energy mode propagation speed or travel time measurement system for use in well logging is dis- closed. A downhole sonde is provided with an acoustic tansmitter and at least one acoustic receiver. The trans- mitter is repetitively driven with a unique or charac- teristic swept frequency signal. Propagated acoustic energy detected at the receiver is cross-correlated with the characteristic transmitter swept frequency signal to provide indications of the arrival of various modes of acoustic energy propagation at the receiver. Logs as a function of borehole depth of the speed of propagation of the various modes of propagation may be derived. -I-

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