Subsea 7 Norway As

Acergy Norway As

Acergy UK Limited

Christian Wathne

Christian Linde Olsen

Kenneth John Whyte

Hallgeir Lenes

Marius Tungseth

Kenneth Whyte

A bearing surface of a subsea foundation has a low-resistance coating such as an aerogel, an aero-clay or a polymeric film. When the foundation is installed, the bearing surface is embedded in the seabed soil using the low-resistance coating to reduce resistance movement of the bearing surface relative to the seabed soil. The coating may then dissolve or fragment away from the bearing surface or transform into a higher-resistance state while remaining on the bearing surface. These mechanisms degrade a resistance-reducing property of the coating to increase resistance to movement of the embedded bearing surface relative to the seabed soil. Suction may be applied to the foundation before or after the resistance-reducing property of the coating has substantially degraded.

Installation of embedded subsea foundations

The invention provides a tether connection apparatus for remotely interconnecting respective free ends of two portions of a mooring tether, such as that used to moor a floating production vessel to the seabed. The apparatus includes a frame, a winch mounted on the frame and operable to pull-in to the apparatus the free end of one of the portions of the mooring tether, subsequent to deployment of the apparatus. The apparatus also includes a connector mount on the frame for releasably mounting a connector. The connector is designed to interconnect the respective free ends of two portions of the mooring tether, once the winch has pulled into the apparatus the free end of a first of the portions of mooring tether. The mount is operable to release the connector subsequent to interconnection.

Methods of and apparatus for mooring and for connecting lines to articles on the seabed

Growing community of inventors

Sandnes, Norway

Christian Wathne