Equinor spudded an appraisal well at Sigrun in PL 025 on 5 June 2018. 15/3-10 was targeting the Middle Jurassic Hugin Formation reservoir which was expected to be reached at 3,876 m. The company used the âDeepsea Bergenâ S/S for the well which had a planned TD of 4,200 m and a planned duration of up to 52 days. Sigrun was discovered by 15/3-4 and the new appraisal well was due to drill deeper in the structure in an attempt to encounter the OWC. After drilling to 990 m the well was junked and re-spudded as 15/3-11 on 14 June 2018. This well was drilled to TD at 4,014m in the Middle Jurassic Sleipner Formation and it confirmed a 35 m oil column (15 m of sandstone) in the Hugin Formation with no OWC. It was abandoned on 11 August 2018. As a result of this well, Equinor has increased the estimated recoverable reserves range from 2-9 MMboe to 7-13 MMboe and a development using the Gudrun facilities is being considered.  The Sigrun discovery well was drilled by Elf Petroleum in 1981 /1982. It found oil and gas at four levels in the Hugin Formation and the Sleipner Formation with different pressure regimes. A test in the Hugin Formation flowed at a rate of 3,868 bo/d plus 8.65 MMcfg/d through a 40/64â choke. A downdip appraisal well was drilled in 1983 / 1984 which established an OWC at 4,023 m. The Hugin Formation was absent and the Sleipner Formation consisted of thin sandstones with a net pay of less than 7 m.   Equinor Energy AS operates PL 025 with a 36% interest. It is partnered by Neptune Energy Norge AS (25%), OMV (Norge) AS (24%) and Repsol Norge AS (15%).
015/03-11 (Sigrun) (Equinor 36%, Neptune Egy 25%, OMV 24%, Repsol 15%) in PL 025, 35m oil column (15 m of sandstone) in the Middle Jurassic Hugin fm, no OWC, prelim. field size after this well from 2-9 MMboe to 7-13 MMboe .