... kelly hole 放方钻杆洞 kelly joint 方钻杆接头 kelly packer 方钻杆防喷封隔器 ...
2
?钻杆转换接头
... 改进型转换接头 modified crossover sub 钻杆转换接头 Kelly joint 钻头转换接头 Bit joint ...
3
?方钻杆转换接头
... 方钻杆转换接头 Kelly joint 螺母移动转换接头 Valve connector 大变小转换接头 reducing bush ...
4
?方钻杆
方钻杆 grief joint; grief kelly; grief stem; keklly vara cuadrante; kelly bar; kelly joint; kelly rod; kelly stem; kelly vara cuadrante de perforacion; square drill rod; square kelly; square shaft 串联 1.