【作者】 刘永刚； 练章华； 申有栋；

【Author】 Liu Yonggang;Lian Zhanghua;Shen Youdong;

【机构】 中国石油天然气集团公司石油管工程技术研究院； 西南石油大学油气藏地质及开发国家重点实验室； 沧州中星石油器材有限公司；

【摘要】 某井在施工过程中,多根钻杆管体出现了轴向开裂失效。通过对失效钻杆的使用环境,钻杆材料的性能,裂纹面的宏观和微观形貌以及裂纹面腐蚀产物的分析以及对钻杆管体材料的应力腐蚀开裂试验和管体周向拉应力的测量,得出了管体纵向开裂为硫化氢应力腐蚀开裂,明确了钻杆管体纵裂失效的原因是管体的残余周向拉伸应力超过了材料的应力腐蚀开裂门槛值。更多还原

【Abstract】 In the drilling process of a real well,axial cracking failures took place on some drill pipe bodies.This paper gave a systematic analysis on service conditions,material quality,macroscopic and microscopic morphology of crack surface,corrosion products and circumferential residual stress.Then stress corrosion cracking experiments against hydrogen sulfide was conducted and the critical stress value of SSCC of the drill pipe material was obtained.The conclusions were that the failure mode of drill pipe was SSCC,and the circumferential residual stress exceeding the critical stress value of SSCC was the cause to insult the SSCC failure.更多还原