钻石，是对莫氏硬度标度10，这意味着他们不仅是最困难的矿物质，但它们实际上是地球上最困难的实质内容。
Diamonds are a 10 on the MOHS Hardness Scale which means that they are not only the hardest mineral, but they are actually the hardest substance on earth.
深部井段地层的硬度高、研磨性强，钻头选型困难，特别是在高密度条件下机械钻速低。
The deep formation has a high degree of hardness and abrasivity; the bit type selection is difficult and the ROP is low especially under the high density mud.
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