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Title: A Brief Tutorial On Oil And Gas Well Casing Inspection Using Electromagnetic Techniques
Author: Stephen D. Bonner
Source: American Gas Association 1982
Year Published: 1982
Abstract: Electromagnetic methods are useful for the in-situ inspection of oil and gas well casing. They detect the amount of metal loss due to any cause, including corrosion. When combined with other methods of casing inspection and leak deteciion, a more complete understanding of the casing condition can be obtained. Five specific electromagnetic techniques are discussed: a high resolution, high frequency method for the detection of localized metal loss on the pipe ID an averaging high frequency method for the measurement of the casing ID a high resolution, low frequency method for the detection of localized metal loss on both the pipe ID and OD an averaging low frequency technique for the measurement of casing wall thickness a DC flux leakage method for the detection of metal loss on both the pipe ID and OD.

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