H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 11/00 (2006.01) E21B 47/12 (2006.01) E21B 47/16 (2006.01) H04B 13/02 (2006.01)
Patent
CA 2127921
METHOD AND APPARATUS FOR ELECTRIC/ACOUSTIC TELEMETRY ABSTRACT OF THE INVENTION: A drill collar section of a drill string (i,e., at the downhole end of the drill string) includes an electric transmitter/receiver assembly which communicates with an electric/acoustic repeater assembly which communicates with an acoustic transmitter/receiver assembly uphole of the drill string by the transmission and receipt of electric and acoustic signals through the drill string. With drill strings that include downhole motors the electric transmitter/receiver assembly may be positioned above or below the motor. Uphole telemetry comprises an electric current induced in the drill string by the downhole electric transmitter. The electric current contains encoded information of downhole conditions and travels up the drill string where it is detected at the electric receiver of the electric/acoustic repeater. The received signal is processed to drive the acoustic transmitter of the electric/acoustic repeater. An acoustic signal containing the encoded information is induced into the drill string by this acoustic transmitter and permeates up the drill string to the uphole acoustic receiver. This received signal is processed and utilized to evaluate and/or optimize the drilling process or to evaluate the earth formations being drilled. Downhole telemetry comprises an acoustic signal induced in drill string by the uphole acoustic transmitter. The acoustic signal contains encoded information of uphole commands and travels down the drill string where it is detected at the acoustic receiver of the electric/acoustic repeater. The received signal is processed to drive the electric transmitter of the electric/acoustic repeater. An electric signal containing the encoded information is induced in the drill string by this electric transmitter and travels down the drill string to the downhole electric receiver. This received signal is processed and utilized to command a downhole processor (i.e., computer).
Hay Arthur
Meyer Wallace
Wisler Macmillan
Baker Hughes Incorporated
Gowling Lafleur Henderson Llp
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