OSLO (Reuters) - Equinor and its partners in the Gudrun oilfield in the North Sea off Norway will invest some 2.4 billion crowns (£225.48 million) in a water injection plant expected to prolong output by three years compared to the original plan, it said on Tuesday.

Output at the field is now expected to be extended to 2032. Equinor's partners include Repsol, OMV and Neptune Energy.

(Reporting by Gwladys Fouche)