Boring or penetrating the earth – Processes
Reexamination Certificate
2008-01-15
2008-01-15
Bagnell, David (Department: 3672)
Boring or penetrating the earth
Processes
C175S107000, C175S106000
Reexamination Certificate
active
11039683
ABSTRACT:
A hydraulic motor for use in subterranean drilling operations in which a drive fluid within a first reservoir is forced through the motor by a high pressure working fluid, such as drilling mud, the drive fluid entering a second reservoir upon exiting the motor. Upon a change in valving, the drive fluid in the second reservoir is forced through the motor by the high pressure working and back into the first reservoir.
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Best Bruno
Van Riet Egbert Jan
Andrews David
Bagnell David
Shell Oil Company
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