UNDERWATER PRODUCTION SYSTEM WITH SUPPORT TOWER OF STRUCTURE FOR PRODUCTION IN ARCTIC Russian patent published in 2016 - IPC E02D23/02 

FIELD: oil industry.

SUBSTANCE: invention relates to a system and method for subsea hydrocarbon extraction operations in a marine environment. Method is carried out using a corresponding system, comprising an elongated truss having a first end and an opposite second end, first end comprising a base located close to seabed. At second end of truss structure of system there is a landing deck configured to receive and detachably fix a floating rig and located below water surface at a sufficient distance to prevent contact with floating ice. System also includes a fluid storage cell located on seabed near base of the truss, wherein one of one or more cells is a storage cell for hydrocarbon fluids for receiving hydrocarbon fluids. System comprises subsea equipment for operation, located above seabed and near second end truss under landing deck, equipment and underwater operation performed fluidly communicating with storage cells of hydrocarbon fluids. Method, carried out with help of said system, includes choosing a platform in marine environment for work on hydrocarbon production, installing cell storage of hydrocarbon fluids to seafloor at selected site; transporting elongated truss to selected site; setting truss in marine environment; transporting supporting structure; installing a support structure; establishing a landing deck; transporting to a floating drilling rig to selected site; performing removable fixing of floating drilling rig on landing deck truss; connecting hydrocarbon transportation lines to create fluid communication. With said system, method is carried out for moving floating drilling rig in marine environment from marine area in which detection is performed for movement of ice cover in marine environment, and disconnecting rig from tower support. Tower support includes an elongated truss, landing deck, located 20 meters (66 feet) below water surface, and above subsea production equipment. Method also includes temporary redeployment of a drilling rig to a new site in marine environment for care of moving ice and returning rig to landing deck of support tower production facilities after passage of ice cover of sea area.

EFFECT: technical result is to create an improved tower arctic support, accelerating deployment of production activities in sea.

41 cl, 11 dwg