Method of transmitting signals from a drill bit to the surface

Details Method of transmitting signals from a drill bit to the surface Method of transmitting signals from a drill bit to the surface

H - Electricity

04

B

325/2

H04B 5/00 (2006.01) E21B 47/12 (2006.01)

Patent

CA 1061411

ABSTRACT A system for performing wellbore telemetry operations wherein a communication link between a subsurface location in a well and the location substantially at the surface is established and maintained through electromagnetic coupling between two in- sulated electric conductors. The first conductor is electrically coupled to a transmitter, normally located at the subsurface location, and extends upwardly in the well. The second conductor is electrically coupled to a receiver, normally at the surface location, and extends down into the well. Normally, the two con- ductors will overlap along a substantial portion of the lengths thereof. As the well is drilled deeper and the drill string is lengthened, the transmitter and the first conductor follow the progression of the wellbore into the earth, thereby reducing the overlap between the first and second conductors. When the two conductors cease to overlap, the second conductor may be leng- thened to re-establish the overlap.

262281

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