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  • OCTG: Brittle failures of OCTG components due to improper testing after manufacturing


    Srinivasa Koneti, John Ross and Samit Gokhale

    Brittle cracking of oilfield tubular components can occur, due to poor fracture toughness of the material. For heat-treated material, most vendor and user manufacturing specifications, including those from the American Petroleum Institute (API), require the mechanical test specimen to be removed from either a sacrificial production part, a prolongation removed from a production part, or a QTC from the same heat. In certain cases, manufacturers prefer to perform all mechanical testing on a QTC. Improper testing methods used after manufacturing, including improper QTC testing, may lead to catastrophic, brittle failures.

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