Transmitting power and telemetry signals on a wireline cable

Details Transmitting power and telemetry signals on a wireline cable Transmitting power and telemetry signals on a wireline cable

2007-08-21

2007-08-21

Edwards, Jr., Timothy (Department: 2612)

Communications: electrical

Wellbore telemetering or control

Using a specific transmission medium

C340S854900, C367S025000

Reexamination Certificate

active

11056840

ABSTRACT:
A wireline logging assembly includes a cable having primary conductors, secondary conductors, and a central conductor. A first power source excites the primary conductors using a first propagation mode. A first telemetry transceiver excites the primary conductors using a second propagation mode orthogonal to the first mode. A second power source excites the secondary conductors and a second telemetry transceiver excites the central conductor. In one embodiment, the diameter of the primary conductors is greater than a diameter of the secondary conductors. The primary conductor includes four primary conductors symmetrically positioned around the center conductor and the secondary conductors include a secondary conductor positioned in the interstice between each pair of adjacent primary conductors. The first telemetry transceiver is preferably connected to a primary winding of a first transformer while the first power source is connected to center taps of the first and second secondary windings of the first transformer.

REFERENCES:
patent: 3603923 (1971-09-01), Nelligan
patent: 6297455 (2001-10-01), Wijnberg et al.
patent: 6469636 (2002-10-01), Baird et al.
patent: 6469969 (2002-10-01), Carson et al.
patent: 6600108 (2003-07-01), Mydur et al.
patent: 7026951 (2006-04-01), Bailey et al.
patent: 7154412 (2006-12-01), Dodge et al.

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