Impact excavation system and method using a drill bit with junk slots
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United States of America Patent
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Feb 14, 2012
Grant Date -
Sep 10, 2009
app pub date -
Jan 30, 2009
filing date -
Jul 22, 2004
priority date (Note) -
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Abstract
A method and system for excavating a subterranean formation including pumping a fluid through a nozzle such that an exit velocity of the fluid is greater than an entrance velocity of the fluid. A plurality of solid material impactors may be circulated with the fluid through the nozzle. A substantial portion by weight of the solid material impactors has a mean diameter of approximately 0.100 inches or less. The substantial portion by weight of solid material impactors exit the nozzle, contact the formation and rebound into a junk slot.
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