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    Φ127mm × 9.19mm IEU S-135鉆桿腐蝕失效分析

    Analysis on Corrosion-caused Failure of φ127mm × 9.19mm IEU S -135 Drill Pipe

    • 摘要: 對(duì)發(fā)生管體刺穿、外壁腐蝕的Φ127mm×9.19mm IEU S-135鉆桿進(jìn)行了失效分析。結(jié)果表明,鉆桿的化學(xué)成分、金相組織、機(jī)械性能均符合API標(biāo)準(zhǔn)及訂貨技術(shù)條件。鉆桿管體刺穿是由于內(nèi)壁發(fā)生嚴(yán)重H2S腐蝕+氧腐蝕造成的。鉆桿管體外壁腐蝕是由氧腐蝕引起的。

       

      Abstract: The analysis involves the failures of the φ127 mm×9.19 mm IEU S -135 drill pipe, including piercing-corrosion and outer surface corrosion of the pipe body. The result shows that the chemical composition, metallographic structure and mechanical properties etc. of the drill pipe are all up to applicable specification of API Standard and the technical requirements as specified in the order, and that the said piercing-corrosion failure is caused by the severe combined corrosive effect on the pipe inner surface by H2S and oxygen, while the said outer surface corrosion is merely caused by oxygen.

       

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