Swept energy source acoustic logging system

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

1982-08-20

1984-05-22

Moskowitz, Nelson

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Land-reflection type

367 31, 367 32, 181102, G01V 140, G01V 128

Patent

active

044505400

ABSTRACT:
An acoustic energy mode propagation speed or travel time measurement system for use in well logging is disclosed. A downhole sonde is provided with an acoustic transmitter and at least one acoustic receiver. The transmitter is repetitively driven with a unique or characteristic 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.

REFERENCES:
patent: 3311875 (1967-03-01), Geyer et al.
patent: 3962674 (1976-06-01), Howell
patent: 4328567 (1982-05-01), Dodge
Pichett, "Acoustic Character Logs . . . Evaluation", 10/10/62, pp. 659-667, J. Petr. Tech.
Arar, "Formation Congressional . . . Techniques", 10/3/78, 53rd Ann. Fall Tech. Conf. AIME, pp. 1-11.

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