Device for closing oil- borehole, particularly under water and in larger depth, has bore bit, which comprises bore axis intervening rotational force and conical boring head provided at its lower end
摘要
<p>The device has a bore bit, which comprises a bore axis intervening the rotational force and a conical boring head (2) provided at its lower end. The boring head is provided as a screw far reaching in the base (3) during rotation. A ring shaped plate (4) protruding over its outer edge is attached to the upper end of the bore head. The bore axis is hollow in the lower region and is open at the lower end.</p>
