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(11) | EP 1 006 257 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | A drag-type Rotary Drill Bit |
| (57) There is provided a rotary drag-type drill bit comprising a bit body (8) having a
leading surface (10) comprising a plurality of pads (11), at least some of the pads
(11) each having a wearable abrasive surface including particles of superhard material
and defining an outer profile of the pad, at least a part of the outer profile of
at least one of the pads (11) being disposed inwardly or outwardly of the outer profile
of the other pads (11). With this arrangement, during initial drilling through softer
formation, most of the removal of formation will be effected by the outermost of the
abrasive pads (11) and little or no formation will be removed by the more inward pads
(11). Accordingly, the bit will act as a lighter set bit and good rates of penetration
may be achieved. As drilling proceeds and the bit wears, which may occur more rapidly
as the bit meets harder formations, the more outwardly disposed pads (11) will wear
down more than the inwardly disposed pads (11) so that the inwardly disposed pads
(11) will begin to contribute more to the cutting action of the bit, so that the bit
effectively becomes heavier set. As drilling progresses to a point where all of the
pads (11) wear down to the same level, the bit will then act as a conventional heavy
set bit where all the abrasive surfaces lie on the same profile. |