Since developed in early 90's for the Shell Auger TLP project in nearly 3,000 ft of water, the number of steel catenary riser (SCR) installations has outnumbered other types of risers for deepwater field development. For water depths over 2,000 ft, the application of SCRs for importing and exporting oil and gas and for water injection on TLPs, Spars, Semis, and FPSOs seems to be unlimited.

This paper illustrates the development of a steel lazy wave riser (SLWR) designed to interface with an existing "I" tube of a Spar hull. It compares the SLWR with a conventional SCR on the basis of their strength and fatigue performance and interference performances with the adjacent vertical risers. The SLWR also was simulated through the installation steps. A successful installation campaign carried out in the Gulf of Mexico in a record 14-month EPCI project provides an example of SLWRs

Application

Import risers for existing Spars

Results, Observations, and Conclusions

SLWRs are viable alternatives to SCRs and flexible pipe risers for tying back subsea wells to Spars that do not have available porches or J-tubes for that purpose.

Significance of Subject Matter

SLWRs can be enabling technology for tying back subsea wells to existing Spars or for outfitting new Spars for future tie backs.

Area of Interest

Riser Systems

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