Ocean Riser Systems As

Mercur Slimhole Drilling and Intervention As

Svein Gleditsch

Paul Anthony Potter

The invention provides a drilling system for drilling subsea wells from a floating mobile offshore drilling unit (MODU), the system comprising a subsea BOP. The system is distinctive in that the subsea BOP has relative small weight and size, the system includes no marine riser but the system comprises: flexible choke and kill lines arranged between the subsea BOP and the MODU, means for drill string guidance and cleaning, for guiding when inserting or taking out a drill string from the BOP and for drill string cleaning when pulling the drill string out from the BOP, means for controlled leakage of seawater into a recovery funnel arranged below the means for drill string cleaning but above the BOP, and means for return from the recovery funnel to the MODU of drilling fluid and seawater leaked into the recovery funnel.

Riserless, pollutionless drilling system

The present invention relates to an arrangement in a floating drilling and intervention vessel, for controlling a heave compensated drill floor suspended in drill floor compensator cylinders . Below the compensated drill floor there is installed a tidal structure ( ) suspended in tidal cylinders or wires . By adjusting the tidal cylinders or the wires in step with the tide it is achieved that the drill floor compensator cylinders can operate around their middle position regardless of the tide lifting or lowering the vessel

Growing community of inventors

Harstad, Norway

Svein Gleditsch