Communications: electrical – Wellbore telemetering or control – Pulse or digital signal transmission
Reexamination Certificate
2006-07-25
2006-07-25
Hofsass, Jeffery (Department: 2612)
Communications: electrical
Wellbore telemetering or control
Pulse or digital signal transmission
C340S854900, C340S853100
Reexamination Certificate
active
07081831
ABSTRACT:
A downhole telemetry system having a surface transceiver, a cable, and a downhole transceiver coupled to the surface transceiver via the cable. The surface transceiver isolates an uplink signal from a combined uplink/downlink signal on the cable using time-domain signal cancellation. The downhole transceiver isolates a downlink signal from the combined uplink/downlink signal using time-domain signal cancellation. In the surface transceiver, the time-domain signal cancellation may be performed by running the combined uplink/downlink signal through a coil of a transformer while running a copy of the downlink signal through an opposite coil of the transformer. Likewise, in the downhole transceiver, the time-domain signal cancellation may be performed by running the combined uplink/signal through a coil of a transformer while running a copy of the uplink signal through an opposite coil of the transformer.
REFERENCES:
patent: 6469636 (2002-10-01), Baird et al.
patent: 6657551 (2003-12-01), Huckaba et al.
patent: 6914538 (2005-07-01), Baird et al.
Conley & Rose, P.C.
Halliburton Energy Service,s Inc.
Hofsass Jeffery
Jenkins Kimberly
LandOfFree
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