A new method to determine the required impact toughness for petroleum drill pipe used in critical sour environment

This paper presents a new model to determine the required impact toughness of petroleum drill pipe steel based upon leak-before-break fracture principle. The loss law of impact toughness in sour critical environment was also experimentally measured which could act as a good supplement for Leak-Before-Break fracture principle. The dominating products were experimentally measured to determine the current industrial ability. The results showed that the required impact toughness through above model could be fully realized now.