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2007年1月底,井下作业公司委托我所对失效的φ127(接头NC50)钻杆进行失效分析。失效形式为螺纹缺损、粘着以及接头密封台肩面撕裂性缺损。
By the end of January 2007, the downhole operator commissioned me to carry out the failure analysis on the failed φ127 (joint NC50) drill pipe. Failure forms of thread defects, adhesion and sealing shoulder shoulder tear defects.