Steerable underreamer/stabilizer assembly and method
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United States of America Patent
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Apr 7, 2009
Grant Date -
Jun 1, 2006
app pub date -
Jan 18, 2006
filing date -
Feb 19, 2002
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A bottom hole assembly includes a drill bit, a stabilized underreamer assembly located behind the drill bit, and a drilling assembly. A method to drill a formation includes positioning a stabilized underreamer assembly behind a drill bit, positioning a drilling assembly behind the stabilized underreamer assembly, and rotating the drill bit and stabilized underreamer assembly with the drilling assembly. A stabilized underreamer located between a directional drilling assembly and a drill bit includes at least one arm assembly extending from the stabilized underreamer assembly, wherein the arm assembly includes a stabilizer portion and an underreamer cutting structure.
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