annular blowout preventer

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annular blowout preventer [′an·yə·lər ′blō‚au̇t pri‚ven·tər]

(petroleum engineering)

A sealing device used in a drilling operation that consists of a large valve, which provides a seal in the annular space between the pipe and the wellbore, or on the wellbore itself if no pipe is present.

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