Blowout Preventer (Bop) 1
Blowout Preventer (Bop) 1 :
(n) One or more valves installed at the wellhead to prevent the escape of pressure either in the annular space between the casing and the drill pipe or in open hole (for example, hole with no drill pipe) during drilling or completion operations. See: Annular Blowout Preventer and Ram Blowout Preventer
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