139.7mm18°台肩牛头吊卡锁舌断裂原因分析  

The analysis of fracture causation of 139.7 mm center-latch elevators for handling 18-degree external upset drill pipe

作　　者：吕拴录[1] 葛明君[1] 冯耀荣[1] 张国正[1] 韩晓毅[1] 卫遵义[1] 

机构地区：[1]中国石油天然气集团公司管材研究所石油管力学与环境行为重点实验室,陕西西安710065

出　　处：《石油矿场机械》2004年第4期89-91,共3页Oil Field Equipment

摘　　要：某井起钻时发生了一起 139.7mm 18°台肩牛头吊卡锁舌断裂事故。文章对吊卡锁舌断口形貌、金相组织、材质等进行了全面试验分析 ,并对吊卡锁舌的受力状态进行了分析计算。认为吊卡锁舌断裂原因是断裂部位表面存在的脱碳层 ,降低了钢的强韧性 ,在使用过程中产生了疲劳裂纹。An accident happened to a certain well it began to drill,whose 139.7 mm Center-latch Elevators for handling 18-degree external upset drill pipe has fractured.The article,experimental analyzes the form of elevators taper latch bolt fracture,metallography organizing,material etc comprehensively,for the press-supported state of the elevators taper latch bolt are also analyzed and calculated.Find that the main course is the fatigue crackle are formed during its using time because of there were decarburations on the surface of the fracture and induce the obdurability of steel.The abrasion and distortion o the elevator taper shoulder have accelerated the fracture of locking pin.

关 键 词：吊卡 锁紧装置 断裂 脱碳 疲劳裂纹 

分 类 号：TE923.04[石油与天然气工程—石油机械设备]