Powerful bonded nonconducting permanent magnet for downhole use

G - Physics – 01 – V

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Details

G01V 3/00 (2006.01) G01R 33/383 (2006.01) G01V 3/32 (2006.01) G01R 33/44 (2006.01)

Patent

CA 2427016

A transverse dipole NMR tool includes a non-conductive permanent magnet (103) made of electrically conductive material such as AmCo. The concentration of SmCo is selected to be at a level low enough to prevent the formation of an electrically conductive path through the magnet. Disposed between the grains of conductive magnet material (101) may be either a ferrite (to increase the remnant magnetization and coercive force) or an inert material. There is a tradeoff between increasing the grain size of the conductive material and the increased intragranular power dissipation. The volume fraction of the conductive material may be increased to a level somewhat higher than a theoretical percolation limit for packed materials; due to randomness in the grain distribution, as long as domains where the percolation limit is exceeded are separate, no conductive path through the magnet results.

Dispositif de RMN transversale dipôle comprenant un aimant permanent non conducteur fait d'une matière électriquement conductrice, p. ex. SmCo. La concentration de SmCo est sélectionnée de manière à présenter un niveau assez faible pour empêcher la formation d'un chemin électriquement conducteur à travers l'aimant. Une ferrite (pour accroître la magnétisation résiduelle et la force coercitive) ou une matière inerte est placée entre les grains de la matière conductrice d'aimant. Il existe un compromis entre l'augmentation de la taille des grains de la matière conductrice et une dissipation d'énergie intragranulaire accrue. La fraction volumique de matière conductrice peut être augmentée à un niveau quelque peu supérieur à une limite de percolation théorique de matières denses ; par conséquent, aucun chemin conducteur ne traverse l'aimant en raison du caractère aléatoire de la distribution des grains, garanti pour autant que les domaines où la limite de percolation est dépassée soient séparés.

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