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Casing head
In oil drilling, a casing head〔(Schumberger: Oilfield Glossary )〕 is a simple metal flange welded or screwed onto the top of the conductor pipe (also known as ''drive-pipe'') or the casing and forms part of the wellhead system for the well.
This is the primary interface for the surface pressure control equipment, for example blowout preventers (for well drilling) or the Christmas tree (for well production).
The casing head, when installed, is typically tested to very strict pressure and leak-off parameters to insure viability under blowout conditions, before any surface equipment is installed.
==See also==
*Drilling rig (petroleum) for a diagram.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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