NMR apparatus for oil well logging of large and small diameter wells
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United States of America Patent
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-
Feb 25, 2003
Grant Date -
Oct 3, 2002
app pub date -
Nov 30, 2001
filing date -
Oct 2, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention is a method and apparatus for performing NMR measurements in MWD effective for large and small boreholes. The invention uses a magnet assembly to produce a generally oval static magnetic field. The invention also employs an antenna assembly comprised of a primary and secondary antenna to deliver a sequence of RF magnetic pulses. For small holes, the antenna assembly operates to substantially match the iso-lines of the static magnetic field within the rock formation during a transmission pulse. For large holes, the invention works in a side-looking mode and the antenna assembly operates both to match the iso-lines of the static magnetic field within the rock formation and to diminish the magnetic field within the borehole during a transmission pulse. The secondary antenna can also be used as a receiver of spin echo signals, or optionally, to make adjustments to the received signal.
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