Hybrid amplitude adjustment algorithm for resistivity logging tools
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United States of America Patent
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Sep 26, 2017
Grant Date -
Sep 22, 2016
app pub date -
Dec 30, 2013
filing date -
Dec 30, 2013
priority date (Note) -
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status (Latency Note)
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Abstract
In one aspect, a resistivity logging tool for a fluid-producing formation if provided. The resistivity logging tool includes at least one transmitter device connected to at least one excitation electrode, multiple receiver devices respectively connected to monitoring electrodes, and a controller. The transmitter can inject an excitation current into the formation via the excitation electrode. Each receiver device can determine a respective voltage level induced by the excitation current. The controller can determine whether a voltage level measured by at least one receiver device is within a specified range. Based on the measured voltage level, the controller can select a global amplitude adjustment algorithm for modifying excitation currents or a localized amplitude adjustment algorithm for modifying one or more gains of one or more receiver devices. The controller can modify the excitation current or gains by executing the selected algorithm.
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