某G105钻杆接头损坏原因分析

为了找出某油田G105钻杆内、外螺纹接头损伤原因,对现场使用的失效钻杆接头进行了宏观分析、理化性能检验、金相及显微组织分析。结果表明,受损的钻杆内、外螺纹接头的化学成分和力学性能均满足API SPEC 5DP—2009标准要求,钻杆接头主要的失效原因为粘着磨损,是在上扣过程中扭矩过大造成的,同时,螺纹脂涂抹不均匀、钻杆接头镀层质量欠佳也是造成粘着磨损的因素。

Damage Reason Analysis of Some G105 Drill Pipe Joint

In order to find out the damage reason of G105 drill pipe internal and external thread joint, the macro analysis, physical and chemical properties test, metallographic and microstructure analysis were carried out for the failure drill pipe joint. The results indicated that the chemical composition and mechanical properties of damaged internal and external thread joint of drill pipe can meet the requirements of API SPEC 5DP—2009 standard, the main failure reason of drill pipe joint is adhesive wear and tear, which caused by excessive torque in the process of screw on, at the same time, the uneven thread compound daub and poor quality of drill pipe joint coating both are the factors for adhesive wear and tear.