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常见问题
| 岩石 | 硬度类别 | 软 | 中软 | 中等 | 中硬 | 硬 | 坚硬 | 最坚硬 | |||||
| 可钻性级别 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | |
| 普氏硬度 | F≤10 |
F≤10 |
F≤15 |
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| 代表性岩石 | 砂岩，石灰岩，大理岩，白云岩，黄铁矿，不坚固的花岗岩、页岩 | 花岗岩，坚固的砂岩、砾岩、石灰岩、石英矿脉 | 坚固的花岗岩、石英岩、玄武岩、火成岩 | ||||||||||
| 两翼PDC锚杆钻头 | 普通型 | ♦ | ♦ | ♦ | ♦ | ♦ | ♦ | ||||||
| 加强型 | ♦ | ♦ | ♦ | ♦ | ♦ | ♦ | ♦ | ||||||
| 三翼PDC锚杆钻头 | 普通型 | ♦ | ♦ | ♦ | ♦ | ♦ | ♦ | ♦ | |||||
| 加强型 | ♦ | ♦ | ♦ | ♦ | ♦ | ♦ | ♦ | ♦ | ♦ | ||||
| 复合片（PDC）钻头 | 内凹型 | ♦ | ♦ | ♦ | ♦ | ♦ | ♦ | ||||||
| 支柱型 | ♦ | ♦ | ♦ | ♦ | ♦ | ♦ | |||||||
| 刮刀型 | ♦ | ♦ | ♦ | ♦ | ♦ | ♦ | ♦ | ♦ | |||||
| 扩孔型 | ♦ | ♦ | ♦ | ♦ | ♦ | ♦ | ♦ | ♦ | ♦ | ||||
| 取芯类 | ♦ | ♦ | ♦ | ♦ | ♦ | ♦ | ♦ | ||||||
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