Acoustic data transmission method

Details Acoustic data transmission method Acoustic data transmission method

1991-07-26

1992-06-23

Lobo, Ian J.

Communications, electrical: acoustic wave systems and devices

Wellbore telemetering

Through drill string or casing

3408531, G01V 140

Patent

active

051249537

ABSTRACT:
An apparatus and method for selecting a passband frequency for acoustically transmitting signals over a drillstring is presented. In accordance with the present invention, a series of electrical signals, each progressively increasing in frequency over a predetermined range, excite an acoustic transmitter producing an acoustic signal in the drillstring. The power spectral density of this signal is measured and correlated to a modeled power spectral density for the drillstring. A passband frequency having the strongest correlation ratio between the measured and modeled power spectral density is selected as the frequency for acoustical communication in the drillstring.

REFERENCES:
patent: 4293937 (1981-10-01), Sharp et al.
patent: 4390975 (1983-06-01), Shawhan
patent: 4562559 (1985-12-01), Sharp et al.
patent: 5050132 (1991-09-01), Duckworth
patent: 5056067 (1991-10-01), Drumheller

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