Communications: electrical – Selective – Interrogation response
Patent
1976-05-03
1978-05-02
Birmiel, Howard A.
Communications: electrical
Selective
Interrogation response
325 6, 325 28, 340 18LD, G01V 140
Patent
active
040877817
ABSTRACT:
A lithospheric electromagnetic telemetry system specifically adapted for telemetry of oil well drilling parameters from well bottom to surface of the earth. Sensors measure such parameters as pressure, temperature, salinity, direction of well bore, bit conditions, as well as the standard well logging parameters. The sensor outputs are converted to digital form and stored in a local memory until they are transmitted upon a triggering signal from a surface station. Transmission is accomplished by phase shift modulating an ELF (Extra Low Frequency) or ULF (Ultra Low Frequency) carrier, preferably in the range of 1-30 Hz. Repeater stations which delay and retransmit the signal are spaced along the oil well drill pipe as required. Both the well bottom station and repeaters are mounted inside the oil well drill pipe without substantially decreasing clearance for mud flow.
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"Borehole Telemetry System is Key to Continuous Downhole Drilling Measurements", McDonald and Ward, The Oil and Gas Journal, Sep. 15, 1975, pp. 111-118.
Cross Robert K.
Grossi Mario D.
Bartlett Milton D.
Birmiel Howard A.
Inge John R.
Pannone Joseph D.
Raytheon Company
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