METHOD AND DEVICE FOR DETECTING CRACK IN LAYER IN PERIPHERY OF BOREHOLE WALL

摘要

A method and apparatus using a multiple transducer acoustic logging tool to detect fractures surrounding a borehole, particularly fractures that do not intersect the borehole wall. The transducers are actuated to produce broad band width pulses and signal enhancement techniques are used to determine fracture width, orientation and distance from the borehole wall.