Communication system for down hole use

Details Communication system for down hole use Communication system for down hole use

2008-05-27

2008-05-27

Wong, Albert K. (Department: 2612)

Communications: electrical

Wellbore telemetering or control

Using a specific transmission medium

C340S855800, C322S014000

Reexamination Certificate

active

07378985

ABSTRACT:
A communication system for down hole use and comprising a drill collar (101) comprising a first portion (103) and a second portion (105) separated from each other by an electrically insulating material (67) and means (22, 63, 77, 81) for generating an electrical signal and for applying the electrical signal to the drill collar (101) such that the electrical signal is transmitted into a geological formation being drilled, characterized in that the means for generating the electrical signal comprises an alternator (22, 63, 77, 81) and means (2, 4, 10) responsive to an electrical output of the alternator for regulating rotation of the alternator.

REFERENCES:
patent: 3828867 (1974-08-01), Elwood
patent: 4739325 (1988-04-01), MacLeod
patent: 5517464 (1996-05-01), Lerner et al.
patent: 6396276 (2002-05-01), Van Steenwyk et al.
patent: 6426917 (2002-07-01), Eckersley et al.
patent: WO0212676 (2002-02-01), None
International Search Report Oct. 9, 2003.

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