定向穿越井中外螺纹接头粘扣原因分析

Cause Analysis of Thread Galling on Pin Joint During Directional Drilling Crossing

某钻井队在河流穿越施工过程中,先后出现几起钻杆接头螺纹粘扣事故。为了查明此次事故产生的原因,对钻杆接头螺纹宏观形貌、化学成分、接头材料的力学性能、金相组织进行全面的分析。结果表明:此次螺纹接头材质、材料的力学性能均符合标准要求,井队在接立柱过程中,立柱中心轴线与入井钻杆轴线不同心,在螺纹旋合过程中发生错扣是导致接头螺纹粘扣的主要原因。根据失效原因提出了相应改进措施和建议。

Some drill pipe joint thread-galling failures were discovered in the drilling crew during the drilling process.In order to find out the cause of the accident,chemical composition analysis, mechanical properties,and micro-structure examination to the joint material and the macro-app e-arance observation to the tool joint threads were taken.The results show that the threaded fasten-ing joint mechanical properties and material conform to the requirements of the standard,there was a central axis deviation of the stands in picking-up process,which lead to joint thread wrong buckle,and it is the main reason that caused joint thread-galling when make-up.Finally,according to the failure reason,puts forward the corresponding improvement measures and suggestions.