Borehole logging tool.

摘要

A flexural wave borehole logging tool 10 employs a multisegmented, point-force type acoustic transmitter 17 for exciting dipolar flexural wave energy with dipole motion in a plurality of azimuthal directions around the axis of a borehole 12. The transmitter 17 comprises a plurality of bender-bar type transducers spaced circumferentially about the axis of the tool 10 with their inner surfaces facing the borehole tool axis and their outer surfaces facing the formations 14 surrounding the borehole. These transducers are selectively modulated to focus dipolar flexural wave energy into the formations 14 in a plurality of preferred azimuthal directions about the borehole 12.