Systems and methods for deep-looking NMR logging
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United States of America Patent
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Dec 9, 2008
Grant Date -
Feb 10, 2005
app pub date -
Apr 30, 2004
filing date -
May 2, 2003
priority date (Note) -
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Abstract
An NMR logging tool for conducting NMR measurements in a plurality of sensitive volumes ranging up to a meter from the tool. The tool comprises a magnetic assembly using one or more permanent magnets and at least one pole piece for extending a magnet pole and shaping the magnetic field to simulate a magnetic monopole in a sensitive volume within the formation. Different embodiments of a segmented antenna enable directional NMR logging. The tool embodiments and methods of their use are suitable for wireline or LWD logging, and can be used for directional drilling.
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