APPARATUS AND METHOD OF DETERMINING CASING THICKNESS AND PERMEABILITY

摘要

An apparatus for evaluating a ferromagnetic tubular within a borehole, the apparatus comprising a tool conveyed in the borehole, the tool having at least one magnet which configured to produce a magnetic flux in the tubular, and at least one flux sensor responsive to magnetic flux and configured to provide an output indicative of an absolute thickness of the tubular.