Roller cone drill bit with cuttings evacuator
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United States of America Patent
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-
Feb 16, 2016
Grant Date -
Oct 3, 2013
app pub date -
Mar 29, 2012
filing date -
Mar 29, 2012
priority date (Note) -
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status (Latency Note)
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Abstract
An earth boring drill bit having an alternate path to allow cuttings to be ejected or evacuated from the drill bit and up the bore hole is disclosed. The evacuation hole of the present disclosure allows larger sized cuttings to evacuate from the bit without having to be continually ground by rolling cone cutters until the cuttings are small enough to follow a path around the edge of the shirttail of the bit and up the borehole. A cuttings restrictor is disposed at the inlet of the evacuation hole. The cuttings restrictor ensures that only cuttings that are sized to move completely through the evacuation hole and exit the drill bit are allowed to enter the evacuation hole.
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