Cutting elements including cutting tables with shaped faces configured to provide continuous effective positive back rake angles, drill bits so equipped and methods of drilling
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United States of America Patent
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Jan 3, 2012
Grant Date -
Dec 9, 2010
app pub date -
Jun 5, 2009
filing date -
Jun 5, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
A cutting element for a drag-type earth-boring drill bit includes a cutting table with a face including a region that is configured to cut into a formation at a positive back rake angle and to direct formation cuttings, or chips, that have been cut from the earth formation toward the hydraulics of the drill bit. Drill bits may include one or more cutting elements that have been configured in this manner. Such a drill bit may also include a wear pad for limiting the depth to which a cutting element penetrates a surface of a bore hole in an earth formation. Such a wear pad may have a substantially constant thickness.
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