Earth-boring bit having improved cutting structure

Details Earth-boring bit having improved cutting structure Earth-boring bit having improved cutting structure

1996-08-07

1997-12-16

Bagnell, David J.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

175426, E21B 1016, E21B 1052, E21B 1058

Patent

active

056974620

ABSTRACT:
A bit body has at least one cantilevered bearing shaft depending inwardly and downwardly from the bit body. A cutter is mounted for rotation on the bearing shaft and includes a plurality of cutting elements arranged in generally circumferential rows on the cutter, the rows including a heel row. The cutting elements in the heel row include at least one chisel-shaped cutting element having a crest oriented transversely to the axis of rotation of the cutter. The remainder of the cutting elements in the heel row have a configuration different from the chisel-shaped elements. All of the cutting elements have approximately the same projection from the surface of the cutter.

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