Single cone rock bit having inserts adapted to maintain hole gage during drilling
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United States of America Patent
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Apr 6, 2010
Issued Date -
N/A
app pub date -
Feb 6, 2008
filing date -
Apr 25, 2002
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A roller cone drill bit is disclosed which includes a bit body adapted to be coupled to a drill string. A bearing journal depends from the bit body. A single roller cone is rotatably attached to the bearing journal. The roller cone has a plurality of inserts disposed at selected positions about the cone. The journal defines a rotation angle with respect to an axis of rotation of the bit such that the roller cone includes a wall contact zone and a bottom contact zone. At least one of the inserts disposed in the wall contact zone has an extension portion terminating in a substantially planar upper surface.
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