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Abstract

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 (45). 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.

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First Claim