Method for placement of surface electrodes for electromagnetic telemetry
A method for placement of electrodes includes determining spatial distribution of a signal caused by generating an electromagnetic field in an instrument disposed in drill string used to drill a wellbore. The electromagnetic field comprises encoded measurements from at least one sensor associated with the instrument. Voltages induced by noise are measured across at least one pair of spaced apart electrodes placed at a plurality of positions spaced apart from a surface location of the wellbore. A spatial distribution of noise is estimated using the measured voltages. Positions for placement of at least two electrodes are selected using the spatial distribution of signal and the spatial distribution of noise.
SCHLUMBERGER TECHNOLOGY CORPORATION
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G01V E21B G01V G01V E21B G01V G01V
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Richard Liang Michael W. Andrew G. David Kirk Gaelle Jiuping Luis Eduardo
Hunter Sun Schwartz Brooks Conn Jannin Chen DePavia