Φ127×9.19mmG105钻杆NC50内螺纹接头直角台肩根部裂纹原因分析  

An Analysis of the Cause of the Crack in the Base of 90° Shoulder of NC50 Screw Joint of φ127×9.19mm G105 Drill Pipe

作　　者：吕拴录[1] 许友林[2] 

机构地区：[1]中国石油天然气集团公司管材研究所,西安710065 [2]胜利石油管理局动力机械厂,东营257064

出　　处：《石油工业技术监督》2004年第5期13-15,共3页Technology Supervision in Petroleum Industry

摘　　要：对某井在钻井期间发生的钻杆断裂事故进行了详细调查研究。对裂纹的钻杆样品断口进行了宏观分析和微观分析,对断裂钻杆材料的化学成分、机械性能和金相组织进行了全面试验分析。最终结合钻杆使用情况和试验分析结果对钻杆接头断裂和裂纹的原因进行了全面分析讨论,认为钻杆接头断裂和裂纹原因是该部位结构尺寸不合理,应力集中严重所致。A detailed investigative study is made of a drillpipe rupture that happened during drilling operation. Both a macroanalysis and a microanalysis are made of the rupture surface of the cracked pipe and an experimental analysis is made of the chemical constituents, mechanical performance, and metallic texture of the ruptured pipe. Finally, in light of the service condition of the drillpipe and the result of the experimental analysis, a comprehensive analysis is made of the cause of the rupture and crack of the tool joint. It is concluded that the rupture and crack of the tool joint has resulted from serious stress concentration with irrational physical dimensions.

关 键 词：钻杆 螺纹接头 钻速 全角变化率 断口 疲劳裂纹 交变应力 

分 类 号：TE921[石油与天然气工程—石油机械设备]