Communications – electrical: acoustic wave systems and devices – Wellbore telemetering – Through drill string or casing
Patent
1990-10-29
1992-07-07
Lobo, Ian J.
Communications, electrical: acoustic wave systems and devices
Wellbore telemetering
Through drill string or casing
3408543, G01V 140
Patent
active
051289016
ABSTRACT:
A method and apparatus for acoustically transmitting data along a drillstring is presented. In accordance with one embodiment of the present invention, acoustic data signals are conditioned to counteract distortions caused by the drillstring. Preferably, this conditioning step comprises multiplying each frequency component of the data signal by exp (-ikL) where L is the transmission length of the drillstring, k is the wave number in the drillstring at the frequency of each component and i is (-1).sup.1/2. In another embodiment of this invention, data signals having a frequency content in at least one passband of the drillstring are generated preferably traveling in only one direction (e.g., up the drillstring) while echoes in the drillstring resulting from the data transmission are suppressed.
REFERENCES:
patent: 3588804 (1971-06-01), Fort
patent: 3697940 (1972-10-01), Berka
patent: 4066995 (1978-01-01), Matthews
patent: 4293936 (1981-10-01), Cox et al.
patent: 4293937 (1981-10-01), Sharp et al.
patent: 4298970 (1981-11-01), Shawhen et al.
patent: 4562559 (1985-12-01), Sharp et al.
Barnes et. al., "Passband for Acoustic Transmission . . . Drill String," Journal Acoust. Soc. Amer., vol. 51, #5, pp. 1606-1608, 1972.
Squire et. al., "A New Approach to Drill-String Acoustic Telemetry," SPE of AIME, SPE 8340, Sep. 1979.
Lobo Ian J.
Teleco Oilfield Services Inc.
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