Adaptive telemetry system for hostile environment well logging
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United States of America Patent
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Nov 15, 1994
Issued Date -
N/A
app pub date -
Mar 22, 1994
filing date -
Nov 16, 1992
priority date (Note) -
In Force
status (Latency Note)
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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.
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