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。

公开(公告)号：US06489763B1

公开(公告)日：2002-12-03

申请号：US09553462

申请日：2000-04-19

申请人： Jaideva C. Goswami ,  Richard W. Oldigs ,  Richard P. Harris ,  Donald C. McKeon

发明人： Jaideva C. Goswami ,  Richard W. Oldigs ,  Richard P. Harris ,  Donald C. McKeon

IPC分类号： G01V300

CPC分类号： G01N24/081 ,  G01V3/32

摘要： A magnet assembly for nuclear magnetic well logging apparatus includes two diametrically opposed magnets which produce a static and substantially homogeneous magnetic field. Each magnet has a magnet axis and is partitioned into a first and a second magnet segment by a plane substantially parallel to the magnet axis.

摘要翻译： 用于核磁测井装置的磁体组件包括两个直径相对的磁体，其产生静态且基本均匀的磁场。 每个磁体具有磁体轴线，并且通过基本上平行于磁体轴线的平面分隔成第一和第二磁体段。