Bi-center bit adapted to drill casing shoe
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United States of America Patent
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-
Oct 7, 2003
Grant Date -
Jul 18, 2002
app pub date -
Oct 2, 2001
filing date -
Feb 3, 1999
priority date (Note) -
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Abstract
The invention is directed to a bi-center drilling tool adapted to fit within and drill through a casing shoe without damage to the surrounding casing. In one embodiment, the tool comprises a bit body having a proximal and a distal end where the distal end defines a pilot bit and an intermediate reamer section, where each the pilot and reamer sections define a bit face including primary and secondary cutting blades and cutting elements disposed on said blades. In this embodiment, the cutting or wear elements disposed on the one or more cutting blades which extend to or are proximate to the pass-through gauge define a selected angle between the line of contact on the cutting or wear elements and the material to be drilled.
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