方钻杆是钻机地面动力和钻头钻井能力之间的动力传送杆件。方钻杆在很长时期内担负这种功能的能力,在很大程度上取决于方钻杆平面和转盘滚子补心之间的间隙。 通过设备的维护、制造和热处理,可以使方钻杆平面和转盘滚子补心之间保持最小的间隙。当出现较大的磨损时,可以利用各种修复的方法,使仍可修复的方钻杆恢复其工作能力。 Square drill pipe is the power transmission rod between the ground power of drilling rig and drilling capacity of drill bit. The ability of kellys to carry out this function over a long period of time depends to a large extent on the clearance between the kelly’s plane and the bowl’s heart. Through equipment maintenance, manufacturing and heat treatment, it is possible to keep the smallest clearance between the square drill plane and the wheel core. In the event of significant wear, a variety of repair methods can be used to restore the still-repairable kelly to its working capacity.