Boring or penetrating the earth – Processes – Boring with specific fluid
Reexamination Certificate
2007-03-06
2007-03-06
Tsay, Frank S. (Department: 3672)
Boring or penetrating the earth
Processes
Boring with specific fluid
C175S207000, C166S265000
Reexamination Certificate
active
10775425
ABSTRACT:
A drilling system for drilling a bore hole into a subterranean earth formation, wherein at least a portion of the mud flow from the primary mud pump is diverted to the mud discharge outlet, thereby creating a backpressure system to readily increase annular pressure.
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Shell Oil Company
Tsay Frank S.
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