Abstract
Deepwater economic limits are expected to be greater than shallow-water economic limits because deepwater structures are larger, more complex, and further from shore, and almost all structures are manned. Unlike shallow-water structures, deepwater platforms typically adopt a combination of dry tree and wet tree wells, the latter being significantly more expensive to operate and maintain than dry tree wells. In this chapter, production and net revenue statistics are evaluated the last year of production for 23 decommissioned structures and 486 permanently abandoned wells from 1977 to 2017 in water depth >400ft. The average inflation-adjusted net revenue the last year of production of all deepwater structures was $13.4 million with a median value of $3.1 million. The average and median inflation-adjusted gross revenues for deepwater fixed platforms were $9.5 million and $2.2 million, respectively. Deepwater dry tree wells exhibited an average economic limit of $3.8 million compared with $17.8 million for wet tree wells in the last year of production, and gas wells generated $3.2 million at the end of their life compared with $5 million for oil wells.
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