Other techniques, such as continuous flight auger drilling, drilling with complete displacement tools, or double rotary drilling, can be used in addition to the typical Kelly drilling.
除了典型的方钻杆钻井之外，还可以使用其他技术，例如连续螺旋钻钻井、使用全位移工具钻井或双旋转钻井。
Rotary drilling
原声例句
奇趣工程百科
英语百科
Hammer drill
A hammer drill, also known as a "rotary hammer", "roto-drill" or "hammering drill", (see also rotary drill) is a rotary drill with a hammering action. The hammering action provides a short, rapid hammer thrust to pulverize relatively brittle material and provide quicker drilling with less effort. These tools are usually electrically powered, and increasingly powered by batteries. The same technology is also used in electric "demolition hammers", also known as "chipping guns" or "breakers".
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