Gas, water injection included in off-Norway heavy-oil development

To realize a much better recovery factor, Norsk Hydro ASA selected pressure maintenance with gas and water rather than water alone for developing the heavy-oil (19° gravity) Grane field in North Sea Block 25/11, off Norway. Fig. 1 illustrates the development scheme. Click here to enlarge imageWith estimated recoverable reserves of 704 million bbl of oil, Grane is the largest known oil discovery on the Norwegian shelf that remains undeveloped, according to Norsk Hydro. It estimates that the field will reach a peak 214,000 bo/d production plateau during 2004-10, with first oil expected in October 2003.Owners in the field include Norsk Hydro (operator), 38%; Petoro AS, 30%; Esso Explor...

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