钻头通常属于刮刀型，装备有PDC或者天然金刚石切削齿，但取芯钻头的特别之处在于钻头中心有一孔。

The bit is usually a drag bit fitted with either PDC or natural diamond cutting structures, but the core bit is unusual in that it has a hole in its center.

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针对山前构造的地层岩性特征，从复合片、刀翼形状、齿型、切削齿力平衡等方面设计和改进了PD C钻头。

Based on the formation lithology characteristics, the PDC bit was optimized from such aspects as the composite block, blade geometry, cutter model, and cutter mechanics balance, etc.

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