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Title: Corrosion Damage Assessment In Gas Storage Well Casing By Means Of Advanced Magnetic Perturbation Logging
Author: R. K. Swanson
Source: American Gas Association 1987
Year Published: 1987
Abstract: Corrosion damage in gas storage well casing is particularly serious because these wells are frequently flowed through casing to improve the gas delivery rate. Penetration of the casing wall by corrosion flaws can result in serious product loss as well as unacceptable safety hazards. As an aid in assessing corrosion damage in well casing, corrosion logs have been available to the industry for many years. These, however, have not received wide acceptance as definitive for making repair decisions. The effort described in this paper was designed to investigate the effectiveness of commercially available corrosion logs, and to demonstrate improvements which would increase the confidence of operators in this procedure. The results of the investigation suggested that considerable improvement could be obtained by the application of modern digital data acquisition techniques to one common type of corrosion log, namely flux leakage or magnetic perturbation measurements. In conjunction with a commerical logging company, an experimental electronic package has been developed and demonstrated. This instrumentation transmits the full set of signal information from an array of downhole magnetometers to the surface. From these data sets, relatively simple interpretation techniques make it possible to size individual corrosion pits. Analysis shows that the sizing of such pits is essential to the accurate assessment of casing damage.

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