G - Physics – 01 – V
Patent
G - Physics
01
V
G01V 3/32 (2006.01) G01R 33/34 (2006.01) G01R 33/44 (2006.01)
Patent
CA 2442274
An antenna design for a downhole nuclear magnetic resonance logging tool is enhanced to shape the resultant RF field generated by the antenna. The enhancement is accomplished by adding additional turns to a portion of the antenna, either circumscribing a ferrite material or located on the surface of an at least partially non- conductive material. The additional turns ar half turns in. combination with the RF field from parallel antenna portions result in a RF field contribution that is proportionally higher than the RF field contribution from the coil portions which are not enhanced. Further, the total RF field can be shaped over a earth sample region depending on placement of the enhancing turns. In this way, for example, the total RF field can be generated to achieve an orthogonal alignment with a static magnetic field over a larger region of the sample.
Harris Richard P.
Taherian Reza
Schlumberger Canada Limited
Smart & Biggar
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