G - Physics – 01 – V
Patent
G - Physics
01
V
G01V 3/32 (2006.01) G01R 33/44 (2006.01) G01R 33/385 (2006.01)
Patent
CA 2277662
The present invention relates generally to an apparatus and method for obtaining an azimuthally resolved nuclear magnetic resonance measurement of an earth formation traversed by a borehole. The measurement can be made while drilling or using a wireline tool. At least one gradient coil is positioned circumferentially around the tool. A magnetic held is produced by the coil in a region of the formation facing the coil. The magnetic field is substantially parallel to the static magnetic field produced by a pair of permanent magnets which form a part of the tool. The additional field causes an additional phase shift for spins located in the region so that the spins subjected to the additional field do not form a spin-echo.
Crary Steven F.
Ganesan Krishnamurthy
Heidler Ralf
Luong Bruno
Speier Peter
Schlumberger Canada Limited
Smart & Biggar
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