FIELD: oil and gas industry.
SUBSTANCE: complex is designed for year-round operation at depths ranging from 100 to 120 m from sea level and includes a drilling underwater structure, an underwater residential block with a control center, an underwater nuclear power plant, a subsea liquefaction plant for natural gas, an underwater tank for receiving/storing liquid nitrogen, an underwater tank for receiving/storing/discharging liquefied natural gas, an underwater gas tanker, underwater reservoir for reception/storage/discharge of condensate and underwater tanker for condensate. In this case, the drilling-producing underwater structure is capable of year-round underwater drilling of wells and their operation with cleaning of the well fluid from mechanical impurities. The drilling-producing underwater structure is connected to the plant for liquefying natural gas by a flexible pipe with a length providing cooling of natural gas in arctic environment of the sea to specified value. The subsea liquefied natural gas plant is adapted to liquefy natural gas by cascade staged successive cooling to a reflux temperature in countercurrent with liquid nitrogen and to provide escape of waste liquid nitrogen through the exhaust flexible pipe to the atmosphere and/or under ice. The underwater atomic power station is adapted to provide electrical power to the flexible floating cables of all underwater structures. Other inventions disclose methods for subsea development of gas condensate deposits and subsea liquefaction of natural gas.
EFFECT: improved safety and quality of works carried out in the process of underwater development of gas-condensate folds and underwater liquefaction of natural gas.
7 cl, 2 dwg
