Subsurface electromagnetic measurements using cross-magnetic dipoles
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United States of America Patent
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Jul 20, 2010
Grant Date -
Nov 27, 2008
app pub date -
May 22, 2007
filing date -
Mar 29, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
Sensor assemblies including transmitter and receiver antennas to respectively transmit or receive electromagnetic energy. The sensor assemblies are disposed in downhole tools adapted for subsurface disposal. The receiver is disposed at a distance less than six inches (15 cm) from the transmitter on the sensor body. The sensor transmitter or receiver includes an antenna with its axis tilted with respect to the axis of the downhole tool. A sensor includes a tri-axial system of antennas. Another sensor includes a cross-dipole antenna system.
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