Bearing elements for drill bits, drill bits so equipped, and method of drilling
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United States of America Patent
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Dec 9, 2003
Grant Date -
Feb 20, 2003
app pub date -
Aug 13, 2001
filing date -
Aug 13, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
A rotary drag bit carrying PDC cutters and elongated bearing elements associated with at least some of the PDC cutters on the bit face thereof Lateral positioning and angular positioning of the elongated bearing elements are adjusted so that all portions of an elongated bearing element travel substantially completely within a tubular clearance volume defined by the path through the formation being drilled by a PDC cutter with which that elongated bearing element is associated, the associated PDC cutter being positioned at about the same radius from the bit centerline as the elongated bearing element. A method of drilling and a method of drill bit design are also disclosed.
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