دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: one of several 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 (i.e., hole with no drill pipe) during drilling or completion operations. Blow- out preventers on land rigs are located beneath the rig at the lands surface;on jackup or platform rigs, at the waters surface;and on floating offshore rigs, on the seafloor. See annular blowout preventet;ram blowout preventer:

v: to close a ram blowout preventer around the drill pipe when the annular preventer has previously been closed to offset the effect of heave on floating offshore rigs during well-control procedures.

n: in annular and ram blowout preventers, the rubber or rubberlike material that contacts itself or drill pipe to form a seal against well pressure.

n: a blowout preventer that uses rams to seal off pressure on a hole that is with or without pipe. Also called a ram preventer. Compare annular blowout preventer.

n: see ram blowout preventer.