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2005年8月7日,中国石化西北石油局一根具有FH内螺纹接头的钻杆使用时发生刺孔事件,为避免此类事故再次发生,对接头进行力学性能试验及化学成分分析,并对断裂螺纹的宏观形貌、金相组织进行分析。结果表明,钻杆接头材质化学成分、回火组织、夹杂物级别、抗拉强度、硬度以及纵向冲击功,均符合API SPEC 7、SY/T 5290—2000及《西北分公司准139.7mm×18°钻杆技术规格书》规定,但接头横向冲击功不符合该规格书之规定。正是由于钻杆接头横向性能较差,故在复杂应力及腐蚀介质综合作用下,在与拉伸应力垂直的螺纹内表面产生应力腐蚀裂纹,随着裂纹沿晶界向内部扩展,导致接头刺穿。为避免出现此类应力腐蚀问题,除严格控制钻具生产制造工艺外,还应做好力学性能、无损探伤检验工作;另外,钻井过程中,要注意观察泵压变化,防止钻具突然失效,对钻井造成严重后果。
On August 7, 2005, a puncture event occurred when a drill pipe with an FH female connector was used at the Northwest Petroleum Administration of Sinopec. To avoid recurrence of such accidents, the mechanical properties test and chemical composition analysis of the joint were carried out. Fracture macro-morphology, microstructure analysis. The results show that the chemical composition, tempering microstructure, inclusions level, tensile strength, hardness and longitudinal impact energy of the drill pipe joints are all in accordance with API SPEC 7, SY / T 5290-2000 and “Northwest Branch of 139.7mm × 18 ° drill pipe technical specifications ”provisions, but the connector lateral impact energy does not meet the requirements of the specification. It is because of the poor horizontal performance of the drill pipe joints, so in the complex stress and corrosive media under the combined effect of tensile stress in the vertical inner surface of the stress corrosion cracking, as the crack along the grain boundary to the internal expansion, leading to joint spines wear. In order to avoid such stress corrosion problems, in addition to strictly controlling the manufacturing process of the drilling tool, mechanical properties and non-destructive testing should also be done. In addition, during the drilling process, the pump pressure should be observed to prevent the sudden failure of the drilling tool, Serious consequence of drilling.