Model QW50A Air Operated Slips is a wellhead tools. Mainly used to clipping tubing and drillingrod which raise or put down at well repairing service operation.
QW50A气动卡瓦是油田修井作业时，安装在井口上用于卡紧油管及类似管柱的一种工具。
2
The structural characters of steel pipe drillingrod, the signification of welding repair for the rods and the narrow gap welding process and equipment are introduced in the paper.
介绍了钻铤钢管的结构特点、焊接修复的意义，以及窄间隙焊接工艺与设备。
3
The detecting speed is high, the performance is good and the operation is convenient; meanwhile, the requirement to field condition is low and the drillingrod does not need cleaning.