空气螺杆钻具是专为空气钻井而设计的动力装置。
The air screw drill tool was power equipment which was designed for air drilling.
对比分析了空气螺杆钻具与泥浆马达在空气钻井井况下的性能差异。
The performance difference between air crew drill and mud motor was analyzed under the air drilling condition.
本发明提出一种带有骨架式定子的螺杆钻具，属于钻井工具领域。
The invention provides a screw drill with a skeleton-type stator, belonging to the field of drilling tools.
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