Riser support device under ultra-deep sea water

Abstract

The invention discloses a riser support device under ultra-deep sea water. The device comprises a riser support buoy, a tension mooring device and an umbilical cable, wherein a wellhead A is formed on the upper part of the riser support buoy; a channel which passes through the riser support buoy is formed on the lower part of the wellhead A; and the riser support buoy has a starfish structure, namely the edge of a central post structure buoy is connected with three rectangular section cantilever buoys which form included angles of 120 degrees on the plane. The tail end of each cantilever buoyhas a truss structure with neutral buoyancy, so that the buoyancy requirement of the riser support buoy can be met by reducing or increasing the length of the truss structure on each cantilever buoy,the construction process difficulty of each cantilever buoy can be greatly reduced, and construction cost is reduced. The riser support buoy provides tension for a top tension riser (TTR), so that a dynamic load supported by a water surface floating production device is reduced, and the requirement on the water surface floating production device is reduced; therefore, the construction cost of thewater surface floating production device is reduced.

Description

technical field [0001] The invention relates to a deep sea oil and gas field development technology, in particular to an underwater riser support device used for the development of an ultra deep sea oil and gas field. Background technique [0002] As the only structure connecting the water surface part and the underwater production system, the riser is an important part of the development of offshore oil and gas fields, especially playing a key role in the development of deep sea and ultra-deep sea oil and gas fields. At present, the widely used and mature production riser in the field of deep sea petroleum engineering is the TTR riser, that is, the top tension riser. [0003] However, in the ultra-deep sea environment, the weight of the riser in the water will naturally increase sharply with the increase of water depth and water pressure; at the same time, the increase in the weight of the riser will also require a great increase in the tension at the top of the riser, whic...

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Problems solved by technology

[0003] However, in the ultra-deep sea environment, the weight of the riser in the water will naturally increase sharply with the increase of water depth and water pressure; at the same time, the increase in the weight of the riser will also require a great increase in the tension at the top of the riser, which has great impact on the TTR standpipe. The applicability and economy of the tube pose serious problems

In addition, since the standpipe is connected to the surface floating production unit, as the water depth increases, the huge underwater riser load will increase the dynamic load that the water surface floating production unit must bear, thereby increasing the capacity of the water surface floating production unit. construction and operating costs

Therefore, using the traditional TTR riser production system, the overall production cost of the oil field is huge

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