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对一例127mm×9.19mm钻杆刺穿事故进行了调查,对该刺穿钻杆进行了裂纹分析、金相分析,并对该钻杆材质进行了全面检查,认为钻杆刺穿是属于早期腐蚀疲劳失效。钻杆内加厚过渡区形状不够理想以及钻杆材料抗腐蚀性能较差是发生失效的主要原因。
A case of 127mm × 9.19mm drill pipe piercing accident was investigated, the piercing drill rod crack analysis, metallographic analysis, and a comprehensive examination of the drill pipe material that drill pipe piercing is an early Corrosion fatigue failure. Drill pipe thick transition zone shape is not ideal and poor corrosion resistance of the drill pipe material is the main reason for failure.