Boring or penetrating the earth – With expansible bore wall anchor
Reexamination Certificate
2006-08-15
2006-08-15
Gay, Jennifer H. (Department: 3672)
Boring or penetrating the earth
With expansible bore wall anchor
C175S099000, C166S212000
Reexamination Certificate
active
07090037
ABSTRACT:
A device for anchoring a drill string in a borehole an anchoring member connected to the drill string, the anchoring member being movable between a retracted position in which the anchoring member is retracted from the borehole wall, and, an extended position in which the anchoring member is extended against the borehole wall so as to anchor the drill string to the borehole wall, and an activating member operable to move the anchoring member from the extended position to the retracted position by the action of pressure of drilling fluid present in the borehole.
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International Search Report dated May 8, 2002.
Gay Jennifer H.
Shell Oil Company
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