10399 Enhancing Design and Monitoring of Cathodic Protection Systems for Deep Well Casings with Computational Modeling

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Product Number: 51300-10399-SG

ISBN: 10399 2010 CP

Author: Andres B. Peratta, Robert A. Adey and John M. W. Baynham

Publication Date: 2010

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Impressed current cathodic protection (CP) is one of the most effective means of corrosion control for well casings. In addition, computational modeling in this field has reached quite a mature stage, capable of offering cost-effective solutions during both the preliminary design stage and the subsequent monitoring stages in the productive lifespan.

During the design stage, computational modeling can be used to anticipate problems of interference and to identify configurations with optimal design according to the local environmental conditions.

While in principle performance monitoring of well casing CP systems is similar to pipelines, the fact that well casings are deployed in vertical direction makes the monitoring much more difficult. It is not generally possible from a practical point of view to have access to the soil-tocasing potentials. Hence, two different approaches are commonly used: E-Log I tests and voltage gradient measurements (CPET) along the casing. Then, proper interpretation from specialized technicians or engineers allows determining the level of performance of the complete corrosion control system. This approach requires experience and particularly in the case of CPET is an expensive procedure and on its own does not always provide detailed information of potential and normal current density profiles along the casing.

Keywords: CP, Cathodic Protection, Modeling, Multi-Layer soil, Well Casing, Boundary Element Method, design and monitoring