US Patent 7588082 Downhole tool position sensing system
Patent 7588082 was granted and assigned to Halliburton on September, 2009 by the United States Patent and Trademark Office.
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A downhole tool includes a mandrel, an inner sleeve, and an outer housing. The inner sleeve being rotatable relative to the outer housing and the mandrel being rotatable relative to the inner sleeve and the outer housings. The outer surface of the inner sleeve includes more than one selected position organized in at least one set. At least two of the selected positions include magnets. The downhole tool also includes at least one magnetic sensor to sense at least one of the amplitude and polarity of the magnetic field for the selected positions and to transmit a signal indicative of the sensed magnetic field. The downhole tool also includes an electronics system to process the sensor signal to determine a magnet reference position of the inner sleeve relative to the outer housing.
US Patent 07588082 Downhole tool position sensing system US Patent 7588082 Downhole tool position sensing system
US Patent 07588082 Downhole tool position sensing system
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