The new revolver is part of its capital optimisation programme, which could also include a new subordinated bond issue of $300m, said the company in its first quarter earnings report.
The revolver has a tenor of four years with two one-year extension options.
A spokesperson for Det Norske Oljeselskap said the loan was in syndication and the process was expected to be completed in May.
The loan has a margin of 400bp, increasing by 50bp after three years, with an additional utilisation fee of 150bp.
The covenants include a leverage ratio of below 3.5 times.
Det Norske has also amended its $3bn reserve-based lending facility (RBL), which was signed last year, and increased the borrowing base from $2.7bn to $2.8bn.
The bookrunners for the RBL facility were BNP Paribas, DNB Markets, Nordea and SEB. Mandated lead arrangers were ABN Amro, Barclays, Citi, Commerzbank, Deutsche Bank, HSBC, ING, Mitsubishi UFJ, Société Générale CIB, Scotiabank, Sparebank 1 and Swedbank.
JP Morgan was an arranger, according to Dealogic.
Some $2.1bn of the RBL had been drawn at the end of the first quarter of 2015.