The SGC Subsea Wellhead System is a pressure containing vessel used for hang-off and seal the different casing strings in the drilling of subsea wells. It also provides the structural foundation for the connection of the Subsea Blowout Preventer stack as well as the attachment of the Subsea Tree.
The NS Subsea Wellhead System consists of components at the surface of an oil or gas well that provides the structural and pressure-containing interface for the drilling and production equipment.
The Special Wellhead System is a non-pressure containing vessel used to hang-off casing strings in the drilling of subsea wells. It also provides the structural foundation for the Subsea Wellhead System for open water drilling.