Self-penetrating drilling method and thrust-generating tool for implementing same
US7059431B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 12, 2001 |
| Grant date | Jun 13, 2006 |
| Priority date | — |
| Expiry date | May 11, 2021 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B10/55
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
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 kth 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 qth rotational cycle of the tool; the kth drill cutter of the nth blade drills, at the qth rotational cycle of the tool, a cut in the rock downstream of the one produced by the kth drill cutter of the (n+1)th blade at the qth 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.