Wells – Pistons – fluid driven into well – With downflow past piston
Reexamination Certificate
2007-03-29
2009-02-03
Bomar, Shane (Department: 3676)
Wells
Pistons, fluid driven into well
With downflow past piston
C166S156000, C166S291000, C166S383000
Reexamination Certificate
active
07484559
ABSTRACT:
A cement float collar is disclosed that can be positioned downhole and used in a wellbore completion operation after drilling a well-bore with casing. A wellbore drilling and completion method is also disclosed. The cement float collar is made for pumping downhole and into engagement with a groove formed in the casing, called the profile nipple. As such, no restriction is needed in the casing for accepting or latching the float collar and the portion of casing including the groove can be installed at the start of the drilling operation. In addition, the profile nipple can be used to engage other drilling tools and, therefore, can already be in place when the final well depth (TD) is reached.
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Bob Tessari, Garret Madell, Tommy Warren, Drilling with Casing Promises Major Benefits, Oil & Gas Journal.
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Angman Per G.
Vert Jeffery Walter
Bomar Shane
Bracewell & Giuliani LLP
Tesco Corporation
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