Wells – Pistons – fluid driven into well – With downflow past piston
Reexamination Certificate
2006-02-14
2006-02-14
Bagnell, David (Department: 3672)
Wells
Pistons, fluid driven into well
With downflow past piston
C166S153000, C166S156000, C166S242100, C166S291000
Reexamination Certificate
active
06997253
ABSTRACT:
An apparatus for preventing or limiting the rotation of cementing plugs in a casing string during drillout. The apparatus includes an outer housing with a sleeve disposed therein. The sleeve has an inner surface configured to engage cementing plugs received therein to cause an interference fit. The sleeve will hold the cementing plugs when rotational forces, such as drilling forces, are applied so that during drillout, rotation of the cementing plug is prevented or is at least limited.
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Foreign communication from a related counterpart application dated Jan. 20, 2005.
Stevens Michael D.
Webb Earl D.
Zimmerman John C.
Bagnell David
Bomar Shane
Halliburton Energy Service,s Inc.
McAfee & Taft P.C.
Roddy Craig W.
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