Communications: electrical – Wellbore telemetering or control – Selective control of subsurface equipment
Patent
1980-11-28
1982-09-07
Moskowitz, Nelson
Communications: electrical
Wellbore telemetering or control
Selective control of subsurface equipment
250262, G01V 140, G01V 500
Patent
active
043486711
ABSTRACT:
A dual spectra well logging system includes a well logging tool which is adapted to pass through a bore hole in an earth formation. The well logging tool includes at least two sensors which sense at least one condition of the earth formation and provides corresponding pulse signals. A circuit connected to the sensors provides a combined pulse signal wherein the pulses of the pulse signal from one sensor has one polarity and the pulses of the pulse signal from the other sensor has pulses of an opposite polarity. A circuit applies the combined pulse signal to a well logging cable which conducts the combined pulse signal to the surface of the earth formation. Surface apparatus includes a network connected to the cable which provides control signals in accordance with the polarity of the pulses in the combined pulse signal. A network connected to the cable inverts the combined pulse signal and provides a combined pulse signal and an inverted combined pulse signal. A first switching network receiving the combined pulse signal passes the pulses derived from the pulses of the one polarity in acccordance with the control signals to provide a first pulse signal while a second switching network receiving the inverted combined pulse signal passes the pulses derived from the pulses of the opposite polarity in accordance with the control signals to provide a second pulse signal. An output network processes the two pulse signals to provide an indication of the earth's condition in accordance with the processed pulse signals.
REFERENCES:
patent: 3681601 (1972-08-01), Papp et al.
patent: 3916685 (1975-11-01), Paap et al.
patent: 3959648 (1976-05-01), Pitts et al.
patent: 3980881 (1976-09-01), Veach et al.
patent: 3990297 (1976-11-01), Palet et al.
patent: 4122338 (1978-10-01), Smith et al.
Gillespie Ronald G.
Kulason Robert A.
Moskowitz Nelson
Ries Carl G.
Texaco Inc.
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