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1. 发明授权

US06586932B1 Enhanced performance antennas for NMR logging 有权
标题翻译：用于NMR测井的增强性能天线
公开(公告)号：US06586932B1
公开(公告)日：2003-07-01
申请号：US10065414
申请日：2002-10-16
申请人： Reza Taherian , Richard P. Harris
发明人： Reza Taherian , Richard P. Harris
IPC分类号： G01V300
CPC分类号： G01R33/341 , G01R33/34046 , G01V3/32
摘要： 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 or 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.
摘要翻译：增强井下核磁共振测井仪的天线设计，以形成由天线产生的合成RF场。增强是通过向天线的一部分添加额外的匝数来实现的，该天线的一部分包围铁氧体材料或者位于至少部分非导电材料的表面上。与平行天线部分的RF场结合的额外匝数或半匝导致RF场贡献成比例地高于来自未增强的线圈部分的RF场贡献。此外，根据增强匝的放置，总的射频场可以在地球样品区域上成形。以这种方式，例如，可以产生总RF场以在样本的较大区域上实现与静态磁场的正交对准。

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