Communications – electrical: acoustic wave systems and devices – Wellbore telemetering – Through drill string or casing
Reexamination Certificate
2005-01-25
2005-01-25
Moskowitz, Nelson (Department: 3663)
Communications, electrical: acoustic wave systems and devices
Wellbore telemetering
Through drill string or casing
C367S076000, C166S073000, C175S040000, C175S050000
Reexamination Certificate
active
06847585
ABSTRACT:
The present invention is a method of transmitting one or more acoustic signals in a drill string using PSK, ASK, FSK or MSFK. The method includes determining one or more stopbands and one or more passbands by testing or modeling the drill string. Two modulating frequencies are selected that are equidistant about a carrier frequency, and which are located within at least one passband. Data representative of downhole measurements or calculations are converted to signals to be transmitted at the modulating frequencies.
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Madan Mossman & Sriram P.C.
Moskowitz Nelson
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