Drill bits with predictable walk tendencies

Details Drill bits with predictable walk tendencies Drill bits with predictable walk tendencies

1997-02-19

1999-08-17

Bagnell, David J.

Boring or penetrating the earth

Bit or bit element

Nonsymmetrical bit

175431, E21B 1046, E21B 1056

Patent

active

059379588

ABSTRACT:
A drill bit adapted to walk predictably during drilling is disclosed, comprising: a bit body having a longitudinal axis and a bit face having an active zone and a passive zone, and a plurality of cutters on the bit face, a first portion of said cutters being positioned in the active zone and a second portion of said cutters being positioned in the passive zone, the first portion of cutters being more aggressive than the second portion. This the difference in aggressiveness of cutters in the first and second portions is achieved by maximizing the effect of one or more of seven features of the bit. These features include: cutter size, cutter tip profile, blade relationship, cutting structure, back rake, gage pad design and balance. Application of the principles of the present invention result in a large imbalance vector being oriented toward the leading half of the active zone.

REFERENCES:
patent: 4440244 (1984-04-01), Wiredal
patent: 4982802 (1991-01-01), Warren et al.
patent: 5010789 (1991-04-01), Brett et al.
patent: 5099929 (1992-03-01), Keith et al.
patent: 5109935 (1992-05-01), Hawke
patent: 5119892 (1992-06-01), Clegg et al.
patent: 5131478 (1992-07-01), Brett et al.
patent: 5222566 (1993-06-01), Taylor et al.
patent: 5238075 (1993-08-01), Keith et al.
patent: 5265685 (1993-11-01), Keith et al.

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