Acoustic data transmission through a drillstring
A method and apparatus for acoustically transmitting data along a drillstring are 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 ([minus]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 ([minus]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. 20 figs.
- DOE Contract Number:
- AC04-76DP00789
- Assignee:
- Teleco Oilfield Services Inc., Meriden, CT (United States)
- Patent Number(s):
- US 5128901; A
- Application Number:
- PPN: US 7-605255
- OSTI ID:
- 7067107
- Resource Relation:
- Patent File Date: 29 Oct 1990
- Country of Publication:
- United States
- Language:
- English
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