Combinations of axial and saddle coils to create the equivalent of tilted coils for directional resistivity measurements
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United States of America Patent
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Jun 21, 2016
Grant Date -
Apr 5, 2012
app pub date -
May 31, 2011
filing date -
Jun 10, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
An electromagnetic well logging instrument includes an instrument housing, at least one transmitter coil disposed on the housing and at least one receiver coil disposed on the housing. At least one of the transmitter and receiver coils is formed from a combination solenoidal (axial) and saddle coils. The net dipole moment direction of the combined coil is determined by selecting the relative turn-areas of the saddle and solenoidal coil. The combined coil can be formed from a single wire wound to have both a longitudinal magnetic dipole moment and a transverse magnetic dipole moment with respect to a longitudinal axis of the housing.
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