Rotary drill bits and methods of designing such drill bits
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United States of America Patent
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Oct 6, 1998
Grant Date -
N/A
app pub date -
Jun 6, 1996
filing date -
Jun 6, 1996
priority date (Note) -
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status (Latency Note)
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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.
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