Fixed cutter bit with backup cutter elements on secondary blades
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United States of America Patent
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Jan 24, 2012
Grant Date -
Oct 29, 2009
app pub date -
Apr 1, 2009
filing date -
Apr 1, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
In an embodiment, a drill bit for drilling a borehole comprises a bit body having a bit axis and a bit face. In addition, the drill bit comprises a primary blade extending radially along the bit face. Further, the drill bit comprises a plurality of primary cutter elements mounted to the primary blade. The primary blade is free of backup cutter elements. Still further, the drill bit comprises a secondary blade extending radially along the bit face. Moreover, the drill bit comprises a plurality of primary cutter elements mounted to the secondary blade. In addition, the drill bit comprises a first plurality of backup cutter elements mounted to the secondary blade in a first backup row that trails the primary row. Further, the drill bit comprises a second plurality of backup cutter elements mounted to the secondary blade in a second backup row that trails the first backup row.
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