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Acoustic data transmission through a drillstring

Patent ·
OSTI ID:868382
 [1]
  1. Cedar Crest, NM
+ Show Author Affiliations
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.
Research Organization:
AT & T CORP
DOE Contract Number:
AC04-76DP00789
Assignee:
Teleco Oilfield Services Inc. (Meriden, CT)
Patent Number(s):
US 5128901
OSTI ID:
868382
Country of Publication:
United States
Language:
English

References (2)

Passbands for Acoustic Transmission in an Idealized Drill String journal May 1972
A New Approach To Drill-String Acoustic Telemetry conference September 1979

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