Between 2005 and 2010, three major events led to a significant increase in design demands of deepwater field developments in the Gulf of Mexico (GoM):Category 5 hurricanes Katrina and Rita (2005),The Macondo well blowout (2010), andThe development of deeper, tighter, more remote reservoirs
These events have resulted in increased metocean criteria, new safety regulations and functional requirements associated with producing deeper, higher pressure and lower porosity reservoirs. This paper will examine and contrast the design impacts on Tension Leg Platform (TLP), Semi-submersible and Spar floating platforms before and after these events. The overall impact of these new requirements on topsides, hull, station-keeping and riser systems of recently sanctioned TLP, Semi-submersible and Spar platforms will be compared with pre-2005 sanctioned platform analogues to demonstrate the resulting impacts on platform size and cost.
Increased demands of post-2005 sanctioned GoM floating platforms have resulted in higher deck elevations, greater topsides payload, more robust station-keeping systems and larger hull displacements. Further, the feasibility of proven risers and well systems is challenged by the higher wave induced motions associated with greater design and survival sea-states and high pressure reservoirs. The design impacts of pre- and post-2005 sanctioned TLPs (Mars A, Olympus), Semi-submersibles (Atlantis, Jack St. Malo) and Spars (Tahiti, Lucius) on topsides, hull, station-keeping and riser systems will be compared and differences explained.
This paper will enable Operators and platform designers to:Appreciate the magnitude of impact on size and cost of floating platforms of post-2005 requirements,Understand the relative impacts on the three major hull types commonly used for GoM developments, andUpdate analogues and norms used in benchmarking and concept selection