Hollow drilling rod for transmitting information
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United States of America Patent
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-
Oct 4, 2005
Grant Date -
Aug 22, 2002
app pub date -
Jan 22, 2002
filing date -
Jan 22, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
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; and a 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.
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