underwater well intervention vessel, and method for conducting offshore sub-pressure drilling

摘要

SUBSIDE INTERVENTION SHIP, AND METHOD FOR DRIVING OFF-SHORE SUB-PRESSURE DRILLING An undersea well intervention vessel includes a dynamically positioned tanker and direct intervention equipment on the deck-mounted deck. tank. Intervention equipment includes drilling equipment to perform under pressure drilling and hydrocarbon liquid separation. A separate production riser is provided so that simultaneous drilling and production can be effected via separate risers. The drill riser is selectively disconnectable from the well so that the tanker can be dynamically repositioned over the well. A tower lashing system is provided so that the production riser can remain in operation during repositioning around the tower. The hydrocarbon liquid separator is connected to a separator of the production facility.