Rotary drag bits having a pilot cutter configuraton and method to pre-fracture subterranean formations therewith
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United States of America Patent
Stats
-
Mar 1, 2011
Grant Date -
Jun 12, 2008
app pub date -
Sep 27, 2007
filing date -
Dec 7, 2006
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A rotary drag bit exhibiting enhanced cutting efficiency and extended life is provided. The rotary drag bit comprises a bit body having a face surface, and a plurality of cutters coupled to the face surface of the bit body. The plurality of cutters comprises at least one pilot cutter and a rotationally trailing larger, primary cutter at substantially the same radius and, optionally of slightly less exposure. The pilot cutter is sized and positioned to pre-fracture the formation and perform an initial cut, while the primary cutter removes weakened, remaining formation material along the same rotational path. A method to pre-fracture subterranean formations using a rotary drag bit having a pilot cutter configuration is also provided.
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