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Shell UK’s efforts to reduce oil-to-sea discharge at Nelson field, 120 km offshore Aberdeen in the Central North Sea, to comply with OSPAR regulations, have been complicated by the heavily corroded state of the Nelson water injectors. The state of these injectors posed a major challenge to successfully recovering the slot and executing a workover, which would allow produced water to be re-injected into the reservoir instead of being discharged to the sea.
Nelson field (Block 22/11) is located about 120 km east of Aberdeen in the Central Graben of the North Sea UKCS. The reservoir interval is the Paleocene, Forties sandstone, which comprises turbidite sandstones deposited in a proximal, mid-fan part of a large, basin-floor, sub-marine fan system. Production is about 40,000 bopd.
Four seawater injectors on the periphery of Nelson field had together injected over 235 million bbl of seawater.
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