Abstract: A petroleum production well ultrasound logging tool is provided comprising a cylindrical main body having a lower end holding a sideways monitoring transducer assembly comprising a ring-shaped ultrasound transducer array of transducer elements. The transducer array has a downward tapering frustoconical shape. The ultrasound transducer array's radially outward face is covered by a funnel shaped acoustic window with a radially inward facing surface corresponding to the outward face. The ultrasound transducer array and the acoustic window is retained on the cylindrical main body's lower end by an end cap.

Abstract: There is provided a transducer assembly for monitoring within a borehole. The transducer assembly is operable to at least one of: (a) generate acoustic radiation when excited with one or more signals; and (b) generate one or more signals when acoustic radiation is received thereat; wherein the transducer assembly includes one or more piezo-electric elements for converting between acoustic radiation and corresponding signals. The assembly includes an interfacing member for acoustically interfacing between the one or more piezo-electric elements and an environment of the borehole for protecting the one or more piezo-electric elements from the environment. The assembly is adapted to at least one of generate acoustic radiation and sense acoustic radiation in a sideways or down-borehole direction.