Patent ID: 6361262
Filing Date: 2002-03-26
Classification: E21B

Abstract:
Drilling vessel with a drilling mast (1) for drilling in the earth's surface from said vessel by means of a drill string (20), comprising an auxiliary mast (2) next to the drilling mast (1), and a clamp carriage (8) which is movable in a guide (9) between a first position near the drilling mast (1) and a second position near the auxiliary mast (2), said clamp carriage (8) having at least two gripping clamps disposed at opposite sides of said clamp carriage (8), characterized in that the clamp carriage (8) comprises a top part (15), which is movable in the guide (9) and a clamp block (16) which is rotatably fixed on the top part (15) and is provided with said at least two gripping clamps, for clamping a first (10) and a second (20) drilling string, the positions whereof can be reversed by rotating the clamp block (16).