Transducer arrangement

G - Physics – 01 – V

Patent

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Details

G01V 1/18 (2006.01) E21B 47/02 (2006.01) G01S 15/87 (2006.01) G01S 15/88 (2006.01) G01V 1/52 (2006.01) E21B 47/022 (2006.01)

Patent

CA 2177148

Transducer arrangement for use as receivers in acoustic borehole measurements, in particular for the purpose of geological steering, stratigraphic imaging and control during drilling of deviated and horizontal wells, whereby transducer sensitivity is focused generally in radial directions normal to the drill string axis in close proximity to the drill bit. Two separate and substantially similar transducer elements are adapted to be located at substantially the same axial position along the drill string axis. The transducer elements having their output terminals interconnected with opposite polarities, so as to have a combined minimum response to incident acoustic waves and vibrations being identical at both transducer elements.

Système à transducteur servant de récepteur dans la mesure acoustique d'un trou de forage, notamment à des fins de guidage géologique, de prise de vues stratigraphique, et de commande du forage de puits déviés et horizontaux. La sensibilité du transducteur est généralement focalisée dans des directions radiales normales à l'axe du train de tiges, à proximité de l'outil de forage (45). Deux éléments transducteurs indépendants et sensiblement semblables sont adaptés pour se situer dans sensiblement la même position axiale le long de l'axe du train de tiges. Les bornes de sortie de ces éléments transducteurs sont raccordées entre elles avec des polarités opposées, pour qu'elles aient une réponse minimale combinée aux vibrations et ondes acoustiques incidentes, identiques au niveau des deux éléments transducteurs.

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