Communications – electrical: acoustic wave systems and devices – Wellbore telemetering – Through drill string or casing
Patent
1990-11-07
1991-09-17
Lobo, Ian J.
Communications, electrical: acoustic wave systems and devices
Wellbore telemetering
Through drill string or casing
G01V 140
Patent
active
050501321
ABSTRACT:
A method of acoustically trasmitting data signals over a drillstring is presented. In accordance with the present invention, acoustic data is transmitted only during preselected short time intervals thereby avoiding destructive interference caused by the signal being reflected back and forth from the ends of the drillstring. The present invention makes use of the fact that the first reflective wave has to travel three times the length of the drillstring before it can interfere with the original data signal. For example, the time for the first wave to travel three times the length of the drillstring can be in the order of one second. Therefore, if the data content of the transmission signal is confined to the first one second or so of transmission, then a transmission channel relatively free of interference is available for data transfer.
REFERENCES:
patent: 4293936 (1981-10-01), Cox et al.
patent: 4293937 (1981-10-01), Sharp et al.
patent: 4298970 (1981-11-01), Shawhan et al.
patent: 4314365 (1982-02-01), Petersen et al.
patent: 4390975 (1983-06-01), Shawhan
patent: 4562559 (1985-12-01), Sharp et al.
Drumheller, D. S., "Acoustical Properties of Drill Strings," J. Acoust. Soc. Amer., vol. 85, #3, Mar. 1985.
Lobo Ian J.
Teleco Oilfield Services Inc.
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