G - Physics – 01 – V
Patent
G - Physics
01
V
G01V 3/30 (2006.01)
Patent
CA 2676805
An antenna 3 of an electromagnetic probe used in investigation of geological formations GF surrounding a borehole WBH comprises a conductive base 31 and an antenna element 32. The conductive base 31 comprises an opened non-resonant cavity 33. The antenna element 32 is embedded in the cavity 33 and goes right through the cavity. The antenna element 32 is isolated from the conductive base 31. The antenna element 32 is coupled to at least one electronic module via a first 34A and a second 34B port, respectively. The electronic module operates the antenna so as to define either a substantially pure magnetic dipole, or a substantially pure electric dipole.
L'invention porte sur l'antenne 3 d'une sonde électromagnétique utilisée dans la prospection de formations géologiques GF entourant un puits de forage WBH, et comprenant une base conductrice 31 et un élément d'antenne 32. La base conductrice 31 comprend une cavité non-résonante ouverte 33. L'élément d'antenne 32 est incorporé à la cavité 33 et passe directement par la cavité. L'élément d'antenne 32 est isolé de la base conductrice 31. L'élément d'antenne 32 est couplé à au moins un module électronique via un premier et un deuxième port 34A et 34B. Le module électronique commande l'antenne pour créer soit un dipôle magnétique sensiblement pur, soit un dipôle électrique sensiblement pur.
Schlumberger Canada Limited
Smart & Biggar
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