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(The May 16 story was refiled to remove reference to North Sea net output rise in paragraph 1, corrects output projections in paragraph 3, changes headline to conform)
By Amanda Cooper and Ron Bousso
LONDON (Reuters) - New oil projects over the next two years in the North Sea will have combined capacity to produce 1.2 million barrels per day (bpd), offsetting a slide in output from the oldest deepwater basin that produces the world's benchmark crude.
The projects stretch from the West Shetlands to the icy fringes of the Arctic Ocean, Reuters research shows.
North Sea crude output was 2.54 million bpd in 2016 and is forecast to reach 2.59 million bpd in 2017 and 2.63 million bpd in 2018, based on output figures for the three main producers Norway, Britain and Denmark from consultants Rystad Energy.
The North Sea produces Brent and three other crudes - Forties, Oseberg, and Ekofisk - that make up the Brent futures benchmark. The region is expected to report its third annual production rise in a row in 2017, reversing years of sliding output.
Since exploration began in earnest in the 1960s, about 40 billion barrels of oil have been extracted from the North Sea.
A 50 percent drop in oil prices from above $100 a barrel in 2014 has forced some North Sea producers to sell assets. Others have adapted as they seek to extract more of the 20 billion barrels estimated to lie under Britain's North Sea zone alone.
"The drop in the oil price forced everyone to focus even more than they were on (production) uptime and operating efficiencies which have risen dramatically over the last two years," Premier Chief Executive Tony Durrant told Reuters.
"We've been at over 90 percent operating efficiency and a lot of the other players are very high as well. If you roll back to 2012-2013, then the North Sea had a shocking record of about 65 percent," he said.
Reuters research shows a range of projects by majors and smaller companies coming onstream in the next two years or so.
The giant Johan Sverdrup project by Norway's Statoil starts pumping 440,000 bpd in 2019, rising to 660,000 bpd by 2022.
BP is revitalising the ageing Schiehallion and Loyal fields off the Shetland Islands with its Quad 204 project, adding 130,000 bpd to production.
Mark Thomas, BP's regional president for the North Sea, said in September that BP's cost of production had fallen to about $16 or $17 a barrel from above $30 in 2014.
FGE analyst James Davis said oil firms had drawn up development plans for old fields and delayed decommissioning dates to increase output beyond expectations and at lower cost.
"There is the obvious hurdle of limited remaining reserves, but operators appear to be positioning themselves to extract as much as possible out of what is left, at relatively low costs," he said.
Small explorers have tapped existing infrastructure to make little fields profitable, often relying on new technology.
Hurricane Energy, which specialises in extraction from naturally fractured rock, last week more than doubled the amount of oil it estimated was recoverable from its Lancaster field.
"The game has changed, but the North Sea hasn't gone away," Malcolm Graham-Wood of consultant Hydrocarbon Capital told online markets platform StockTube in March.
In January and February, the North Sea market attracted about $4 billion (£3 billion) in acquisitions. But industry lobby Oil & Gas UK has said that without sustained investment as many as 80 oilfields could shut by 2020.
"We are in a period where we are staving off the overall decline in the North Sea, partly through efficiencies, partly through a group of new projects," FGE's Davis said.
Additional reporting by Nerijus Adomaitis in Oslo; Graphics by Gustavo Cervantes in Singapore; Editing by Edmund Blair