Hollow drilling rod for transmitting information

Details Hollow drilling rod for transmitting information Hollow drilling rod for transmitting information

2005-10-04

2005-10-04

Edwards, Jr., Timothy (Department: 2635)

Communications: electrical

Wellbore telemetering or control

Using a specific transmission medium

C340S854300, C367S082000, C367S083000

Reexamination Certificate

active

06952170

ABSTRACT:
The invention relates to a hollow drilling rod for transmitting information, said rod being for placing in a borehole filled with drilling mud. The rod comprises an electrically conductive cylindrical wall (521, 522) having an inside face, an outside face, a first end provided with a male coupling sleeve (62), and a second end provided with a female coupling sleeve (60), and being characterized in that it further comprises:a layer of electrically insulating material (70) covering the inside face over its entire length; anda conductive layer (80) covering said insulating layer and electrically connected at its ends to two electrically conductive rings, said conductive layer itself being covered by a second insulating layer (86) leaving said conductive rings in contact with the drilling mud.

REFERENCES:
patent: 3518609 (1970-06-01), Fontenot, Jr.
patent: 3866678 (1975-02-01), Jeter
patent: 4012092 (1977-03-01), Godbey
patent: 4496203 (1985-01-01), Meadows
patent: 4684946 (1987-08-01), Issenmann
patent: 4899834 (1990-02-01), Weldon
patent: 6763887 (2004-07-01), Boyadjieff
patent: 0 964 134 (1999-12-01), None
patent: 2 777 594 (1999-10-01), None

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