Boring or penetrating the earth – Automatic control – Of fluid pressure below ground
Reexamination Certificate
2005-09-20
2010-11-09
Bagnell, David J (Department: 3672)
Boring or penetrating the earth
Automatic control
Of fluid pressure below ground
C175S038000, C175S218000
Reexamination Certificate
active
07828081
ABSTRACT:
A method of drilling a bore hole in a fractured formation. A drill pipe is deployed into the borehole, whereby an annular space is formed between the drill pipe and the borehole wall. A drilling fluid is pumped, by means of primary pumps, into the borehole via an internal conduit of the drill pipe and a drill pipe fluid outlet present in the vicinity of a distal end of the drill pipe. The annular space is pressure sealed using a pressure seal such as a rotating head on a BOP. A well control fluid is pumped into the annular space via a well control conduit that fluidly connects the annular space, in a location between the pressure seal and the drill pipe fluid outlet, to a backpressure system. The well control fluid is pressure-balanced against the pressure seal and the backpressure system.
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At-Balance Americas LLC
Bagnell David J
Loikith Catherine
Osha & Liang LLP
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