Rotary and mud-powered percussive drill bit assembly and method
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United States of America Patent
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Jul 10, 2007
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N/A
app pub date -
Jun 28, 2006
filing date -
Jun 28, 2006
priority date (Note) -
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Abstract
A method and apparatus for boring a hole in the earth including a drill bit assembly including a fluid-powered impact engine contained within a drillpipe sub between an ordinary drillpipe and a modified conventional rotary drill bit. The impact engine is powered by pressurized drilling fluid delivered via the drillpipe which acts on a piston to charge an energy accumulator, preferably in the form of a spring. Periodically, the pressurized drilling fluid in the impact engine is vented, allowing the energy accumulator to rapidly transfer its stored energy to an impact bit which is slidingly housed in a rotary bit to strike and fracture the formation.
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