Multi-directional cutters for drillout bi-center drill bits
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United States of America Patent
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N/A
Issued Date -
Feb 21, 2002
app pub date -
Aug 3, 2001
filing date -
Aug 21, 2000
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A drillout bi-center bit includes first and second axes of rotation separated by a distance D, a first region of radius D centered on one of the axes of rotation, a second region of radius D centered on the other of the axes of rotation, and a third region defined by the overlap between the first and second regions, wherein the cutters provided within the third region are designed to withstand cutting in opposing cutting directions. This may be achieved by providing each cutter with two cutting faces, or by providing two groups of cutters, one group arranged to cut in one direction, the other group being designed to cut upon rotation in the other direction, one of the groups protruding from the bit body of the bit to a greater depth than the other group.
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