Method for transmitting data over logging cable

Communications: electrical – Wellbore telemetering or control – Pulse or digital signal transmission

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G01V 140

Patent

active

048916412

ABSTRACT:
The present invention provides an improved method for transmitting logging data from a logging apparatus operating in a well borehole to surface equipment over a logging cable. The logging data has variations in amplitude, which are converted to a frequency-modulated signal. The center frequency of the frequency-modulated signal is relocated to a lower frequency, which is within the bandwidth of the logging cable. The frequency-modulated signal is transmitted over the logging cable and received by the surface equipment, where the logging data is reconstructed.

REFERENCES:
patent: 4035763 (1977-07-01), Cowles
patent: 4468665 (1984-08-01), Thawley et al.
patent: 4631536 (1986-12-01), Ward et al.
patent: 4796026 (1989-01-01), Hammond

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