| 摘要 |
<p>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.</p> |
