16/1-21 S
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General information
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Wellbore history
GeneralWell 16/1-21 S was drilled to appraise the 16/1-9 Ivar Aasen discovery on the Gungne Terrace in the North Sea. The objective was to obtain key depth and reservoir information for field development in the north-eastern part of the Ivar Aasen Discovery. The targets were reservoirs in the Heimdal, Hugin/Sleipner and Skagerrak Formations.Operations and resultsWildcat well 16/1-21 S was spudded with the jack-up installation Mærsk Interceptor on 21 January 2015 and drilled to TD at 2630 m (2584 m TVD) m in the Triassic Hegre Group. A 9 7/8" pilot hole was drilled from the 30" conductor shoe to 376 m. No shallow gas was encountered. The well was drilled with seawater and hi-vis pills down to 373 m, with Glydril mud from 373 m to 1304 m, and with Versatec oil based mud from 1304 m to TD.The Heimdal Formation was encountered water filled at 2176 m (2138.7 m TVD). Reservoir properties were excellent with 26.5 m net sand with 30% average porosity. The distribution of the Jurassic versus the Triassic sequence was different from the expected. Triassic reservoir was thicker than predicted, while the Jurassic had no reservoir at all. However, the total actual reservoir quality and hydrocarbon pore volume height was in agreement with the predicted, since the Triassic proved better than expected combined with a deeper hydrocarbon contact. The Triassic reservoir (Skagerrak Formation) was penetrated at 2491 m (2446.6 m TVD) and it was hydrocarbon bearing with 20.3 m net pay with 20% average porosity. The hydrocarbon type was undersaturated oil, as in well 16/1-16. No gas cap was present and an oil down-to situation was established at ca 2535 m (2490 m TVD). Hydrocarbon shows were first evident in the lowermost part of core #1, from 2489 m in the Skagerrak Formation. Good hydrocarbon shows continued in the sandy sections in the cores. No shows were recorded below 2554 m, in the lowermost part of the Skagerrak Formation.Three cores were cut in succession from 2499 m in the Heather Formation to 2586.2 m in the Skagerrak Formation. Core recovery was 100%. The core to log shift is +1.85 m for all three cores. Fluid samples were taken at 2178.25 m (water), 2497.71 m (oil), 2514.7 m (oil), 2525.25 m (oil), 2533.61 m (oil), and 2538.92 m (water).The well was plugged back and abandoned on 3 March 2015 as an oil appraisal well.TestingNo drill stem test was performed. -
Cuttings at the Norwegian Offshore Directorate
Cuttings at the Norwegian Offshore Directorate Cuttings available for sampling?YESCuttings at the Norwegian Offshore Directorate Cutting sample, top depth [m]Cutting samples, bottom depth [m]380.002630.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12449.02492.2[m ]22492.32546.7[m ]32546.22586.2[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]137.5Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Casing and leak–off tests
Casing and leak–off tests Casing typeCasing diam.
[inch]Casing depth
[m]Hole diam.
[inch]Hole depth
[m]LOT/FIT mud eqv.
[g/cm3]Formation test typeCONDUCTOR30223.130223.10.00SURF.COND.20368.026373.01.48LOTPILOT HOLE376.09 7/8376.00.00INTERM.13 3/81299.017 1/21304.01.67LOTOPEN HOLE2630.08 1/22630.00.00 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]EMA XPT ADT MRX GR12392625LWD - DI168373LWD - GR RES DEN NEU DI PWD13052630LWD - GR RES DEN NEU SON DI PWD1681304MDT HC21532541QGEO PPC MSIP GR SAH5502616RES DEN NEU LIT SON GR3681239SS PP GR3681239VSI4 GR ACTS6692620XLROCK IS EDTC GR15312483ZAIT PEX NEXT HNGS12902632 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit168168802848959959126416641730175918082035203520752113217622122253228122812286228622942294246224912491 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured3851.099.0WBM12651.1917.0WBM13401.2939.0Versatec OBM15001.5134.0Versatec OBM24481.2928.0Versatec OBM25460.9927.0Versatec OBM26301.3137.0Versatec OBM