The air screw drill tool was power equipment which was designed for air drilling.

空气螺杆钻具是专为空气钻井而设计的动力装置。

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Based on this, we may make improvement to prolong the life of screw drill tool and screw pump.

这一观点，有可能使螺杆钻具与螺杆泵的寿命短的现状有所改善。

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The operation performance of PDC bits with screw drill tool appplied now in oilfield were analyzed comprehensively.

用螺杆钻具组合实施煤矿工程孔定向钻进时，钻头侧向力是其主要力学特性。

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