Boring or penetrating the earth – Processes
Reexamination Certificate
2007-10-02
2007-10-02
Bagnell, David (Department: 3672)
Boring or penetrating the earth
Processes
C175S101000, C175S321000, C175S171000
Reexamination Certificate
active
10799790
ABSTRACT:
A rotatable drilling shoe attachable to a section of casing that allows for drilling and casing of a well bore in a single trip. The drilling shoe includes a fixed section and a rotatable section that has a drillable bit attached thereto. The drilling shoe further includes a mechanism for inhibiting rotation of the rotatable section after the casing is cemented into place so that the drillable bit can be drilled out by a subsequent drilling operation.
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Collins Gary J.
Cousins Edward T.
Leveque Marc E.
Smith Kenneth L.
Bagnell David
Bomar Shane
ConocoPhillips Company
Cross Ryan N.
Kelly Kameron D.
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