DEVELOPMENT OF MARINE DEEP SEA OIL-AND-GAS DEPOSITS Russian patent published in 2015 - IPC G01S15/00 

FIELD: oil and gas industry.

SUBSTANCE: invention is related to the development of underwater mineral deposits, mainly deposits of liquid and gaseous minerals, and namely to the construction of process facilities intended for the development of marine deep sea oil-and-gas deposits operated in extreme conditions. The method for the development of marine deep sea oil-and-gas deposits lies in the construction of a row of offshore fixed platforms, underwater bottom facilities, subsea intrafield and main pipelines, tanks for the well production storage and shipping facilities, at that at least one platform is made as a subsea version with a substructure fixed to the bottom and upper dimension placed below the water level per a value of the biggest size of an iceberg underwater part passing over it. Besides, all platforms in the subsea version should be interconnected structurally and technologically by electrical cables and pipelines for condensate and gas. Regular deep seismic sounding is performed in the area of terminals for the production of underwater hydrocarbon deposits by passive sensing of the sea bottom and further analysing of microseismic motions of the Erath crust; a block-module of a power supply platform is equipped with a gas turbine plant; sea conditions forecast is made close to the marine drilling rigs by the placement of pitch-roll buoys in the aquatic area and start-up of pilotless aircraft equipped with measuring instruments; a value of the biggest underwater part of an iceberg is defined by sounding of the underwater part of the iceberg by sonar signals from a movable submersible vehicle equipped with a parametric sonar and controlled through a hydroacoustic communications channel by an automated control and monitoring system; block-modules of the platform substructures in the subsea version used for the accommodation of personnel in underwater air chambers are made with docking units ensuring docking with a submarine escape vehicle placed in a special submarine hangar.

EFFECT: improved reliability of the construction and operation, reduced capital and operational costs for the development of marine deep sea oil-and-gas deposits.

2 dwg