Rotary drill bits and methods of designing such drill bits

Details Rotary drill bits and methods of designing such drill bits Rotary drill bits and methods of designing such drill bits

1996-06-06

1998-10-06

Neuder, William P.

Boring or penetrating the earth

Bit or bit element

Specific or diverse material

E21B 1046

Patent

active

058163468

ABSTRACT:
A rotary drill bit for drilling subsurface formations comprises a bit body having a shank for connection to a drill string, a plurality of primary blades and at least one secondary blade circumferentially spaced and extending outwardly away from a central axis of rotation of the bit, a plurality of cutters mounted along each blade, a majority of the cutters mounted on each of the primary blades having a greater exposure than a majority of the cutters on the secondary blade, and a sweep angle of the secondary blade is less than a sweep angle of the primary blades. The drill bit will exhibit a rate-of-penetration as a function of the size of the cutters on the primary blades, and exhibit a torque profile as a function of the size of the cutters on the at least one secondary blade.

REFERENCES:
patent: 5222566 (1993-06-01), Taylor et al.
patent: 5244039 (1993-09-01), Newton, Sr. et al.
patent: 5346025 (1994-09-01), Keith et al.
patent: 5549171 (1996-08-01), Mensa-Wilmot et al.
patent: 5607024 (1997-03-01), Keith et al.
patent: 5607025 (1997-03-01), Mensa-Wilmot et al.

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