| CPC E21B 47/13 (2020.05) [H04B 17/102 (2015.01); H04B 17/318 (2015.01); H04B 17/382 (2015.01)] | 19 Claims |
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1. A method for configuring telemetry transmission of a downhole telemetry tool deployed in a subterranean wellbore, the method comprising:
(a) receiving an electromagnetic telemetry signal at a surface of the Earth during a process of drilling the subterranean wellbore, the electromagnetic telemetry signal transmitted at a known carrier frequency, ranging from 0.5 to 40 Hz, from within the subterranean wellbore using the downhole telemetry tool, the received electromagnetic telemetry signal including a telemetry signal and noise;
(b) selecting a portion of the received electromagnetic telemetry signal;
(c) computing a measured power spectral density (PSD) of the portion selected in (b);
(d) computing a theoretical power spectral density (PSD) of the transmitted electromagnetic telemetry signal at the known carrier frequency; and
(e) processing the measured PSD computed in (c) in combination with the theoretical PSD computed in (d) to compute an attenuation factor of the transmitted electromagnetic telemetry signal at a plurality of frequencies.
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