Partially enhanced drill bit

Details Partially enhanced drill bit Partially enhanced drill bit

1997-08-18

2000-06-13

Schoeppel, Roger

Boring or penetrating the earth

Bit or bit element

Impact or percussion type

175431, 175434, E21B 1036

Patent

active

060737115

ABSTRACT:
A partially diamond-enhanced drill bit includes a bit body, at least one annular row of non-diamond enhanced buttons mounted in the bit body, and at least one annular row of diamond-enhanced buttons mounted in the bit body radially outside of the non-enhanced buttons. A total wear volume of the non-enhanced buttons in at least one row thereof is greater than 75 percent of a total wear volume of an outermost annular row of enhanced buttons. A number of non-enhanced buttons in one of the rows thereof is at least equal to a number of enhanced buttons in the outermost annular row thereof. At least some of the non-enhanced buttons have a greater wear volume than any of the enhanced buttons. The radially outermost row of non-enhanced buttons is displaced axially forwardly with respect to an adjacent row of enhanced buttons.

REFERENCES:
patent: 4832139 (1989-05-01), Minikus et al.
patent: 5335738 (1994-08-01), Waldenstrom et al.
patent: 5370195 (1994-12-01), Keshavan et al.
patent: 5636700 (1997-06-01), Shamburger

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