Transducer head assembly for well logging

摘要

A transducer head assembly for wellbore logging comprises: a head housing (52) having at least one transducer aperture, the housing being mountable within a logging string for rotation relative thereto; at least one transducer (72; 74) disposed within said at least one aperture; and means for adjustment of the at least one transducer between radially inward and outward positions with respect to the housing. A method of conducting wellbore logging comprises disposing a first transducer (72; 74) within a rotatable transducer head (50) to establish a first transducer scanning radius; establishing a second transducer scanning radius by disposing a second transducer (72; 74) within the rotatable transducer head (50), the second transducer scanning radius being substantially equal to the first transducer scanning radius; and rotating the transducer head (50) within a wellbore to scan the wellbore circumferentially.