| 摘要 |
The invention relates to a device for drilling into geological formations, which device comprises: -a rotatable body; -drilling cutters arranged on an axial end surface of the rotatable body; -a percussion part, which is parallel to the rotating axis reciprocatable arranged on said body; and -percussion cutters arranged on an axial end surface of the percussion part. The invention further relates to a method for drilling into geological formations, which method comprises the steps of: -bringing a percussion part with a percussive movement in contact with the formation in order to crack at least a part of the formation, and scraping the cracked parts of the formation with a drilling part.
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