Technology Editor, Seismic & Subsea
HOUSTON –Drawing upon a successful ExxonMobil field project, Howard Wang concluded that steel catenary risers can be used in conjunction with turret moored FPSOs in deepwater. Speaking at the Deep Offshore Technology conference today, Wang said that while there are design challenges in meeting strength and fatigue criteria at the touch-down point (TDP) and at the top of the riser, use of TDP clump weights can eliminate the need for high-density coatings.
"Compression at the TDP is mitigated with a weight-optimized configuration," Wang said, adding that "fatigue is a challenge, but performance can be enhanced and SCRs can be installed with properly designed connections and an installation design optimized to meet specific (application) requirements."
This presentation builds on previous work and demonstrates that weight optimization can enable use of an SCR with turret moored FPSOs. Designing the position, length, and density of different coatings are used to reach the optimum configuration for both strength and fatigue response.