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This article describes two principal methods for detecting well casing corrosion, namely, metal-loss tools and casing current measurement, as well as their limitations and advantages. It discusses the factors to be considered in designing well casing cathodic protection systems. These include the determination of cathodic protection current by the casing polarization and CPP tests or by mathematical models; calculation of casing-to-anode separation; isolation of the casing from other facilities; consideration of stray current interference from other dc power sources; and determination of the size and the location of the anode bed for effective current output for the desired life...

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