Boring or penetrating the earth – Processes
Reexamination Certificate
2008-07-01
2008-07-01
Tarazano, D. Lawrence (Department: 4171)
Boring or penetrating the earth
Processes
C175S038000, C175S297000, C175S417000, C175S426000, C408S229000
Reexamination Certificate
active
11619418
ABSTRACT:
In one aspect of the invention a drill bit comprises an axis of rotation a body and a working face. The body comprises a fluid passageway with a first seat and houses a jack element substantially coaxial with the axis. A stop element is disposed within the passageway and has a first near-sealing surface. The jack element has a shaft intermediate an indenting end and a valve portion. The valve portion has a second near-sealing surface disposed adjacent the first near-sealing surface and a second seat disposed adjacent the first seat. As a formation strongly resists the jack element, the distance between the sealing surfaces narrows. This causes an increase in fluid pressure within the passageway and forces the indenting end down into the formation. This movement of the jack element relieves the pressure build up such that the formation pushes the jack element back, thereby oscillating the jack element.
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Dahlgren Scott
Hall David R.
Ro Yong-Suk
Tarazano D. Lawrence
Wilde Tyson J.
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