Communications: electrical – Wellbore telemetering or control – In horizontal or inclined passage arrangement
Patent
1989-05-17
1991-04-23
Steinberger, Brian S.
Communications: electrical
Wellbore telemetering or control
In horizontal or inclined passage arrangement
340858, G01V 100
Patent
active
050103334
ABSTRACT:
The present disclosure is directed to an improved telemetry system and data recovery telemetry receiver apparatus for installation with a logging cable supported sonde. In the sonde, a data stream is modulated onto a carrier after conversion by an encoder. Encoding involves conversion from a stream of binary data into four state symbols which are then encoded into seven duobinary levels. The availability of redundant levels permits correlation between encoded symbols and adjacent symbols. This is transmitted up the monocable to the surface and is recovered. The recovery involves amplification by an automatic gain control amplifier, conversion from an analog to digital form in an ADC, demodulation and reconstruction of the transmitted signal by means of a adaptive transversal filter equalizer featuring fractionally spaced sampling. Reconstructed output levels are then provided, and a slicer adjusts those values to the permitted seven levels. The data is then decoded. Extraordinary bandwidth compression is accomplished so that a large data flow can be provided through a monocable having only limited band pass capacity.
REFERENCES:
patent: 3991611 (1976-11-01), Marshal III et al.
patent: 4797668 (1989-01-01), Zimmer
patent: 4808996 (1989-02-01), Zimmer
Draehn Ricky L.
Gardner Wallace R.
Goodman Kenneth R.
Puckett Robert D.
Beard William J.
Halliburton Logging Services Inc.
Steinberger Brian S.
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