Drill bit with recessed center
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United States of America Patent
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Sep 23, 2014
Grant Date -
May 12, 2011
app pub date -
Nov 9, 2010
filing date -
Nov 9, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
A drill bit configured for boring holes or wells into the earth include a plurality of blades configured with a recessed center such that the blades cut a core therebetween. Cutting elements in the recessed center are configured to cut and remove the core. The recessed center has a first diameter at a height from the cutting elements in the recessed center and a second diameter smaller than the first diameter such that the confining stress on the core is relieved prior to being cut by the cutting elements in the recessed center.
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