Adaptive telemetry system for hostile environment well logging

Details Adaptive telemetry system for hostile environment well logging Adaptive telemetry system for hostile environment well logging

1994-03-22

1994-11-15

Eldred, J. Woodrow

Communications: electrical

Wellbore telemetering or control

Pulse or digital signal transmission

3408555, 367 76, G01V 100

Patent

active

053652290

ABSTRACT:
The operation of hostile environment logging tools at temperatures up to 250.degree. C. stresses not only the tools, it also places severe demands upon the wireline telemetry due to the wide variations in the logging cable transmission characteristics. A robust adaptive wireline telemetry system for use in hostile environments has been developed that combines sophisticated digital communication methods with modern Digital-Signal-Processing (DSP) techniques. The downhole telemetry transmitter outputs a multilevel signal. The uphole receiver includes an adaptive transversal-filter equalizer (TFE) that is continually optimized to correct for changing signal distortion. The system operates robustly at high data rates over the temperature range of 0.degree. to 250.degree. C.

REFERENCES:
patent: 4355310 (1982-10-01), Belaigues et al.
patent: 5010333 (1991-04-01), Gardner et al.
patent: 5091725 (1992-02-01), Gard

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