MEASURING CASING ATTENUATION COEFFICIENT FOR ELECTRO-MAGNETICS MEASUREMENTS

摘要

Methods and related systems are described for making an electromagnetic induction survey of a formation surrounding a cased section of a borehole. An electromagnetic transmitter and/or receiver are deployed into the cased section of the borehole. One or more additional devices are used to measure the properties of a conductive casing relating to conductivity, thickness and magnetic permeability. A casing attenuation coefficient is then calculated that can then be used for the processing of the deep-sensing induction measurements.