In recent years, environmentally assisted cracking has caused failures of many Grade P110 couplings during fracturing operations, causing enormous economic loss to the oil and gas industry. Factors that can contribute to such failures include mechanical damage, localized hard spots, improper heat treatment, and the increased use of high yield-strength couplings with high- collapse casing. Examples of such failures are reviewed and the contributing factors are discussed.
Burns, Michael G. and Buehler, W. M., “Analysis of High-Collapse Grade P110 Coupling Failures” Proceedings of Materials Science and Technology 2010, October 17-21, Houston, Texas
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