Self-penetrating drilling method and thrust-generating tool for implementing same

摘要

The invention concerns a self-penetrating drilling method and a thrust-generating tool: the tool comprises N blades. Each blade comprised K drill cutters. The shapes, positions and orientations of said drill cutters are determined in the following manner: the k^th drill cutter of the last blade drills, at the (q-1)^th of the tool rotational cycle, a cut in the rock downstream of the one produced by the (k+1)^th drill cutter of the first blade at the q^th rotational cycle of the tool; the k^th drill cutter of the nth blade drills, at the q^th rotational cycle of the tool, a cut in the rock downstream of the one produced by the k^th drill cutter of the (n+1)^th blade at the q^th rotational cycle of the tool; the normal to the leading edge of the drill cutter has a component along the axis of rotation oriented towards upstream.