Balmoral Offshore Engineering - Glossary
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	Blowout preventer (BOP): A large valve that encases an oil well at surface. During drilling or well interventions, the valve may be closed if overpressure from an oil reservoir causes formation fluids such as oil and natural gas to back up within the wellbore and threaten the rig. Choke line: a pipe that extends from the BOP to the choke manifold and is used during well control procedures. Kill line: a pipe connected to the annulus below the BOP that allows the introduction of drilling fluids when the BOP is closed. Lift: See Buoyancy and Archimedes’ principle. Oceanus: Oceanus was a waterway which the Greeks and Romans believed to be an enormous river encircling the world. In Greek mythology, this world-ocean was personified as a Titan, a son of Uranus and Gaia. In Hellenistic and Roman mosaics, this Titan was often depicted as having the upper body of a muscular man with a long beard and horns and the lower torso of a serpent.