Patent ID: 9690000
Date: 2017-06-27
CPC Classifications: E21B,G01N,G01V

Claim:
1. A method of determining an azimuthal stress variation in a tubular within a borehole, the method comprising: using at least one transducer on a logging tool for generating a wave in the tubular; using each of a plurality of receivers azimuthally distributed on the logging tool for producing a signal responsive to the generated wave and an azimuthal stress variation in the tubular, comprising using, for each of the plurality of receivers, an electromagnetic receiver mounted on a pad extendable from a body of the logging tool and wherein the signal produced by each of the plurality of receivers is indicative of a magnetic permeability of the tubular; and determining from the signal from each of the plurality of receivers an indication of the azimuthal stress variation in the tubular.