Boring or penetrating the earth – Processes
Reexamination Certificate
2009-03-31
2010-02-16
Dang, Hoang (Department: 3672)
Boring or penetrating the earth
Processes
C175S296000, C175S389000, C175S415000
Reexamination Certificate
active
07661487
ABSTRACT:
A downhole percussive tool is disclosed comprising an interior chamber and a piston element slidably sitting within the interior chamber forming two pressure chambers on either side. The piston element may slide back and forth within the interior chamber as drilling fluid is channeled into either pressure chamber. Input channels supply drilling fluid into the pressure chambers and exit orifices release that fluid from the same. An exhaust orifice allows additional drilling fluid to release from the interior chamber. The amount of pressure maintained in either pressure chamber may be controlled by the size of the exiting orifices and exhaust orifices. In various embodiments, the percussive tool may form a downhole jack hammer or vibrator tool.
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Dahlgren Scott
Hall David R.
Marshall Jonathan
Dang Hoang
Townsend, III Philip W.
Wilde Tyson J.
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