Marine subsea free-standing riser systems and methods
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A standpipe and free technology, applied in the direction of drill pipe, casing, earthwork drilling and mining, etc., can solve problems such as unsolved
Active Publication Date: 2013-06-12
BP CORP NORTH AMERICA INC +1
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Specifically, existing containment work does not address the fluid properties resulting from the combination of hydrocarbons and seawater at the deep-sea pressures and temperatures that promote the formation of gas hydrates
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Embodiment 100
[0229] Free standing risers 2 and 4 in embodiment 100 may be a tube-in-tube design based in part on a "dry tree" riser design, wherein the annulus is filled with a flow assurance fluid (e.g., low pressure nitrogen) Air to improve liquidity assurance. While further details are set forth here, the main parts of system 100 may be:
[0230] 6 inches (15 cm) of slow wave ID flexible jumper 14 with distributed buoyancy modules 48 connected from the base of each FSR to the subsea manifold on the seabed (in the case of the first FSR (2), distributed buoyancy The module 48 may be connected to the closed process manifold (CDM) marked 26, while in the case of the second FSR (4) the decentralized buoyancy module 48 may be connected to the BOP stack manifold 30, the BOP stack Sink 30 is fluidly connected to BOP stack cap 24 via flexible jumper 14A, and to CDM 26 via flexible piece 46);
[0231] a suction pile foundation 16 and a chain rope 58 connectable to the respective bases of FSR2 a...
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Abstract
A free-standing riser system connects a subsea source to a surface structure. The system includes a concentric free-standing riser comprising inner and outer risers defining an annulus there between. A lower end of the riser is fiuidly coupled to the subsea source through a lower riser assembly (LRA) and one or more subsea flexible conduits. An upper end of the riser is connected to a buoyancy assembly and the surface structure through an upper riser assembly (URA) and one or more upper flexible conduits, the riser also mechanically connected to a buoyancy assembly that applies upward tension to the riser. The riser may be insulated for flow assurance, either by a flow assurance fluid in the annulus, insulation of the outside of the outer riser, or both. The system may include a hydrate inhibition system and / or a subsea dispersant system. The surface structure may be dynamically positioned.
Description
[0001] background technical field [0002] The present invention generally relates to systems and methods for use in the fields of marine oil and gas exploration, production, drilling, completions, workover, and sealing and processing. Background technique [0003] Free standing riser (FSR) systems have been used during production and completion operations. For a review, see "Recent Developments in Free Standing Riser Technology" by Hatton et al., 3rd Workshop on Subsea Pipelines, Rio de Janeiro, Brazil, Dec. 3-4, 2002 . See also US Patent No. 7,434,624. For other examples of FSR systems, see US Published Patent Application Nos. 20070044972 and 2008022358, which disclose FSR systems and methods of installing FSR systems. Other patents that mention other features of riser systems are US Patent Nos. 4,234,047, 4,646,840, 4,762,180, 6,082,391 and 6,321,844. [0004] "Riser-based gas lift recovery" is a technology to improve product flow, especially heavy oil flow, in FSR sy...
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