1) closed-window tapered milling barrel
变径套铣筒
2) cutter bushing
铣刀变径套
3) washover-string
套铣筒
1.
Stress distribution and mechanics analytical methods of washover-string are different from the common drill string (such as drill collar) because that the structure features of two kinds of strings are so different.
由于修井专用的套铣筒与常规钻井施工所用钻柱在结构上存在很大差异,套铣筒内应力分布与常规钻柱(钻铤)内的应力分布不同,力学分析的方法也不同;本文在对套铣筒进行力学分析以及摩阻力计算时,充分考虑了其结构特点:直径大、壁薄、环空间隙小。
4) diameter of TIG welding torch
套筒直径
5) reducing sleeve
导径套筒
6) reducing socket
异径套筒
补充资料：径径
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