Boring or penetrating the earth – With below-ground tool drive prime mover – With mechanical motion-converting means
Reexamination Certificate
2007-07-10
2007-07-10
Mai, Lanna (Department: 3637)
Boring or penetrating the earth
With below-ground tool drive prime mover
With mechanical motion-converting means
C175S189000, C175S296000
Reexamination Certificate
active
11427184
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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Andrews & Kurth LLP
Bush Gary L.
Cooke Brett T.
Mai Lanna
Smith Matthew J.
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