Selecting transmission frequency based on formation properties
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United States of America Patent
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Jan 9, 2018
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N/A
app pub date -
May 8, 2015
filing date -
Jun 19, 2014
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Abstract
A method and apparatus for downhole data transmission. The method comprising monitoring electrical impedance properties of a downhole formation by applying an electrical signal between a first portion and a second portion of a drill string that are electrically insulated from each other by an insulating portion, selecting a frequency for transmitting data by electromagnetic telemetry based at least in part on the monitored electrical impedance and transmitting the data by encoding the data in a waveform having the selected frequency and applying the waveform between the first portion and the second portion of the drill string.
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