这是适用于深孔的通用型高速钢长钻头。

This is general HSS long drills for deep holes.

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PD C钻头用于软到中硬的均质地层钻进具有钻速高、寿命长等特点，但不适合含砾石地层和软硬交错地层。

PDC bits have been used to drill the homogeneous formation from soft to medium-hard, but they are not suitable for drilling in gravel and multi-interbedded formation.

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PD C钻头具有钻进时间长、机械钻速高、起下钻次数少等特点，使用PD C钻头可大大提高钻井速度。

PDC bit have advantages of high penetrate rate, long bit life which saving tripping times so that the application of PDC bit can improve drilling efficiency.

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