... drag twist 螺旋式钢绳捞矛 drag type bit 刮刀钻头 drag unit 拖运装置；反拉装置 ...
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step type drag bit 阶梯形刮刀钻头
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Based on the theoretical analysis, a new type of blade bit was invented. And this kind of bit combines the advantages of PDC bits and drag bits. And a series of field experiments were performed.
在理论分析的基础上，综合PD C钻头和刮刀钻头的优点，设计了一种新型的刮刀钻头，并进行了现场试验。
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