论文部分内容阅读
采用宏观分析、化学成分分析、力学性能测试、金相检验及扫描电镜断口分析等手段,对某油田一根规格为φ88.9mm×6.45mm的110钢级超级13Cr马氏体不锈钢油管的刺穿失效原因进行了分析。结果表明:油管失效的实质是油管发生了氯离子应力腐蚀开裂,裂纹起源于外壁腐蚀坑底部,从外壁向内壁扩展,直到穿透壁厚,形成刺穿通道,高压流体从内向外刺出并在随后的过程中形成了刺穿孔洞。
By means of macroscopical analysis, chemical composition analysis, mechanical property test, metallographic examination and scanning electron microscopy fracture analysis, the piercing of a super-13Cr martensitic stainless steel tubing of 110 steel grade of φ88.9mm × 6.45mm in an oilfield Failure causes were analyzed. The results show that the essence of tubing failure is chloride stress corrosion cracking in the tubing. The cracks originate from the bottom of the corrosion pits in the outer wall and extend from the outer wall to the inner wall until they pierce through the wall thickness. In the ensuing process pierced holes formed.