Self-penetrating drilling method and thrust-generating tool...

Details Self-penetrating drilling method and thrust-generating tool... Self-penetrating drilling method and thrust-generating tool...

2006-06-13

2006-06-13

Bagnell, David (Department: 3672)

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

C175S394000

Reexamination Certificate

active

07059431

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 kthdrill cutter of the last blade drills, at the (q−1)thof the tool rotational cycle, a cut in the rock downstream of the one produced by the (k+1)thdrill cutter of the first blade at the qthrotational cycle of the tool; the kthdrill cutter of the nth blade drills, at the qthrotational cycle of the tool, a cut in the rock downstream of the one produced by the kthdrill cutter of the (n+1)thblade at the qthrotational 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.

REFERENCES:
patent: 2365941 (1944-12-01), Crake
patent: 3181629 (1965-05-01), Birman
patent: 4848489 (1989-07-01), Deane
patent: 5641027 (1997-06-01), Foster
patent: 5937958 (1999-08-01), Mensa-Wilmot et al.
patent: 6167975 (2001-01-01), Estes
patent: WO99/09290 (1999-02-01), None

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