Earth boring drill bits with casing component drill out capability and methods of use
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United States of America Patent
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Jul 6, 2010
Grant Date -
Jun 26, 2008
app pub date -
Oct 30, 2007
filing date -
Feb 19, 2004
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A drill bit includes a bit body having a face on which two different types of cutting elements are disposed, the first type being cutting elements for drilling at least one subterranean formation and the second type being cutting elements for drilling through a casing bit disposed at an end of a casing or liner string and cementing equipment or other components. The second type of cutting elements exhibits a relatively greater exposure than the first type of cutting elements, so as to engage the interior of the casing bit and, if present, cementing equipment components and cement to drill therethrough, after which the second type of cutting elements quickly wears upon engagement with the subterranean formation material exterior to the casing bit, and the first type of cutting elements continues to drill the subterranean formation.
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