Communications: electrical – Wellbore telemetering or control – Multiplexed signals
Patent
1992-04-29
1993-09-07
Eldred, J. Woodrow
Communications: electrical
Wellbore telemetering or control
Multiplexed signals
3408554, 3408557, 3408558, G01V 100
Patent
active
052433374
ABSTRACT:
A process for optimizing the transmission rates of digitized signals on transmission lines in multifunction cables, such as logging cables linking well tools to surface installations. The process includes digitising of the data to be transmitted and coding thereof through voltages selected from a set of multilevel coding voltages (2 to 32 for example), and widening towards high frequencies of the passband of each transmission line used, by combination with correcting circuits selected so that the transfer function of the corrected line is substantially that of a filter of the Bessel type, at least in a given frequency range on either side of a 3-dB cut-off frequency fc which depends on the number of coding voltages and on the amplification parameters. Using this process makes it possible to exceed very easily a total flow rate higher than one Mbits/s without increasing the transmission error rate.
REFERENCES:
patent: 3514750 (1970-05-01), Pritchett et al.
patent: 5051991 (1991-09-01), Szczutkowski
patent: 5083124 (1992-01-01), Nordstrum
Beauducel Claude
Cretin Jacques
Saussier Daniel
Eldred J. Woodrow
Institut Francais du Pe'trole
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