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 Approach
Benefits
 The
Horn Mountain Field is located 84 miles offshore in Mississippi Canyon Block
126 and 127 in a water depth of 5,423ft. This represents the deepest dry tree
production riser installation as of 2002.
The Horn Mountain field is being developed with a Truss Spar-based production
facility. The spar will have completion, sidetrack and workover capabilities
in order to service the wells.
The 106ft x 555ft Truss Spar accommodates a wellbay with 14 production top
tensioned riser (TTR) slots and 2 import steel catenary riser (SCR) well slots.
Tension for the risers is provided by air cans.
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- Verification of the TTR designs including VIV,
fatigue and interference analysis.
- Dual casing riser tension factor selection.
- Finite element modeling and analysis.
- Requirements for inner casing and pre-stretch and
tubing slack off.
- Analysis results and tensioning distribution.
- Installation mechanism and procedures.
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- Determination of tension factors and tension distributions
for a range of riser operating conditions including production, workover,
completion, well kill and shut in.
- Appropriate elongations between casing and tubing
were specified for the installation phase.
- Operating matrix provided for use as a basis to
evaluate tension factor design and tension distributions within the
risers.
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