Boring or penetrating the earth – With self-acting cyclic advance and retraction of tool or...
Reexamination Certificate
2007-01-09
2007-01-09
Neuder, William (Department: 3672)
Boring or penetrating the earth
With self-acting cyclic advance and retraction of tool or...
C175S072000, C175S320000
Reexamination Certificate
active
10475920
ABSTRACT:
A drilling system and method for drilling a borehole into an earth formation is provided. The drilling system has a drill string having a lower section provided with a sleeve which is radially expandable from a retracted mode in which the sleeve extends around the lower drill string section and is releasably connected thereto, to an expanded mode in which the sleeve is released from the lower drill string section and is expanded against the borehole wall. The drilling system further has a control means for selectively releasing the sleeve from the lower drill string section and expanding the sleeve against the borehole wall.
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Neuder William
Shell Oil Company
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