Robert E Broding

US Patent:

50016768, Mar 19, 1991

Filed:

Apr 27, 1990

Appl. No.:

7/515996

Inventors:

Robert A. Broding - Lakeland FL

Assignee:

Mobil Oil Corporation - Fairfax VA

International Classification:

G01V 100

US Classification:

367 31

Abstract:

A logging tool is lowered in a borehole. The tool is positioned so that the transducer is offset from the axis of the borehole. The transducer transmits acoustic energy such that it strikes the borehole wall or casing at an incident angle that directs reflections from the borehole wall away from the transducer and at the same time allows transmission into the surrounding formations or cement in the borehole annulas between the casing and the borehole wall. Reflections of the transmitted acoustic energy from anomalies within the surrounding formations as well as cement in the annulas are received by the transducer.