drill collar stem

Research on a new stress relief groove of drill collar threaded connections;

新型石油钻铤联接螺纹减应力区的研究

Measuring residual stress by blind-hole method for the box connection of Ф158.8 mm drill collar;

用盲孔法测量Ф158.8mm钻铤内螺纹端残余应力

The welding machine is composed of welding machine tool, narrow clearance melting pulse argon arc welding system, drilling tool conveying system and controlling system, realizing the automatic welding and repair of kelly bar and drill collar.

该专用机由焊接机床、窄间隙熔化极脉冲氩弧焊接系统、钻具输送系统和控制系统等部分组成,可实现方钻杆、钻铤等厚壁管钻具的自动焊接修复。

The study on drilling collar screw-stick,analysis of drilling collar screw thread and test of material and thread parameter have been done.

对钻铤粘螺纹事故进行了调查研究,并进行了宏观形貌和材质分析;对新钻铤材质和螺纹参数进行了检验,并采用不同旋螺纹扭矩对新钻铤试样进行了上卸螺纹试验。

Fractographic and metallographic examination, mechanical testing have been carried out on the failure analysis of the drilling collar.

对钻铤断裂原因进行了断口分析、金相检验和力学性能试验。

Main reasons of causing drill collar screw failure are discovered by way of further investigation and analysis on these problems.

通过对钻铤螺纹失效问题的深入调查和分析,找出引起钻铤螺纹失效的主要原因。