Drill string enabling information to be transmitted

Details Drill string enabling information to be transmitted Drill string enabling information to be transmitted

2005-10-25

2005-10-25

Edwards, Jr., Timothy (Department: 2635)

Communications: electrical

Wellbore telemetering or control

Using a specific transmission medium

C367S083000

Reexamination Certificate

active

06958703

ABSTRACT:
The present invention relates to a drill string fitted with information transmission means. The hollow rods of conductive material have their inside faces covered in an insulating material. The transmission means comprise a first electrical unit having at least a first annular electrode secured to the insulating inside face of the drill string, said electrode being in electrical contact with the mud contained inside the drill string so as to establish a flow of current in the conductive mud; and a second electrical unit disposed in said borehole, close to the top end of the drill string in order at least to receive the information contained in said electrical current.

REFERENCES:
patent: 3518609 (1970-06-01), Fontenot, Jr.
patent: 3866678 (1975-02-01), Jeter
patent: 4095865 (1978-06-01), Denison et al.
patent: 4483393 (1984-11-01), More et al.
patent: 4496203 (1985-01-01), Meadows
patent: 4575681 (1986-03-01), Grosso et al.
patent: 4578675 (1986-03-01), MacLeod
patent: 0 295 178 (1988-06-01), None
patent: 0 964 134 (1999-06-01), None
patent: 2 777 594 (1998-04-01), None
International Search Report dated Oct. 12, 2001 (in French).

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