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Title: Development Of Methods For Assessing Corrosion Metal Loss Defects In Well Bore Casing Strings
Author: Tim Illson, James Philo, Ramon P. Harris, Jr.
Source: American Gas Association 2005
Year Published: 2005
Abstract: Most of the existing gas storage within the United States is in depleted natural gas fields. During the lifetime of these fields, there is the possibility that the structural integrity of many of the original completions may be compromised as a consequence of mechanical damage and/or corrosion. While considerable effort has been made by the research community to assess the integrity of transmission pipelines, there is very little specific guidance on how to assess the structural integrity of damaged well casing components. The Underground Storage Committee of Pipeline Research Council International, Inc. (PRCI) recognized this issue and concluded that the industry would benefit from having specific guidance to assess the integrity of damaged casing/tubing components. In particular, the gas storage industry requires guidance for deciding when repair and replacement of casing/tubing should be carried out. Advantica has already undertaken a considerable program of work on behalf of PRCIs Materials Technical Committee to develop methods for assessing the remaining strength of corroded transmission pipelines it has also led a group sponsored project to develop new and improved methods for assessing corrosion damage in pipelines 1. Assessment methods developed by Advantica are now embodied into internationally recognized fitness-for-purpose (FFP) standards such as BS7910 2 and DnV RP-F101 3. Consequently, PRCIs Underground Storage Committee contracted Advantica to initiate the development of a method for assessing corrosion metal loss defects in gas storage well casing strings. This paper describes the results of this work.

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