Apparatus and method for making nuclear magnetic measurements in a borehole
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United States of America Patent
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Dec 19, 2000
Grant Date -
N/A
app pub date -
Sep 9, 1998
filing date -
Sep 9, 1998
priority date (Note) -
In Force
status (Latency Note)
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Abstract
An NMR logging tool has a conducting permanent magnet with its axis parallel to the borehole axis to produce a static field in a portion of the formation surrounding a borehole that is parallel to the borehole axis. A dipole RF antenna with the dipole axis orthogonal to the borehole axis is used to produce an RF magnetic field orthogonal to the static field. The same antenna is used to receive the echo signals from excited nuclei in the formation. A number of gapped ferrite strips on the permanent magnet shield the permanent magnet from the RF field and enhance the RF field. Another form of the tool may be used for making Measurement-While-Drilling measurements with the permanent magnet set in a recess on a drilling collar.
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