“spearing” the riser
TRANSCRIPT
RISER INSERTION TUBE
HORIZON BOP
DISCOVERER ENTERPRISEDRILLSHIP
DAMAGED RISER
INSERTION TUBE TOOL
“SPEARING” THE RISER
Rubber diaphragms conform around drill pipe to plug riser as much as possible.
Insertion tube is guided into riser.
INSERTION TUBE
RISER
DRILL PIPE
OIL
OIL
Hydrocarbons are “lifted” to the drillship by inducing nitrogen in the drill pipe. Rubber diaphragms minimize seawater ingress near the insertion tube inlet which signifi-cantly reduces the appearance of hydrates.
CAPPED DRILL PIPE
METHANOL LINE
RUBBER DIAPHRAGMS
LMRP
BOUYANCY MODULE