16/1-30 S
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General information
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Wellbore history
Well 16/1-30 S Lille Prinsen Outer Wedge was drilled to appraise the 16/1-29 Lille Prinsen Discovery o n the north-western part of the Utsira High in the North Sea. The structure was first tested by wells 16/1-6S and 16/1-6 A, which made the Verdandi Discovery in the Eocene Grid and Paleocene Heimdal formations. The Lille Prinsen prospect is mapped in several geographically separate segments at Basement to Base Cretaceous level. These segments are: The Permian Main Carbonate Discovery penetrated by 16/1-29 S, the western Outer Wedge segment, and segments 2,3 and 5 (Carbonate upsides). The primary objective of 16/1-30 S was to appraise the Outer Wedge segment believed to consist of Permian carbonates in the 16/1-29 S with an overlying package of Triassic to Early Cretaceous siliciclastics. The secondary objective in 16/1-30 S was to appraise the oil and gas in the Grid and Heimdal formations found in the 16/1-6 S Verdandi discovery.Operations and resultsAppraisal well 16/1-30 S was spudded with the semi-submersible installation West Phoenix on 27 May 2019 and drilled to TD at 2140 m (1990 m TVD) m in basement rock. Operations proceeded without significant problems. The well was drilled with seawater and hi-vis pills down to 572 m, with Glydril mud from 572 to 1361 m, and with Versatec oil-based mud from 1361 m to TD.Well 16/1-30 S encountered poor quality oil-filled sandstone in the Grid Formation. Shows were observed on core and cuttings in the interval 1499 to 1421 m, including fluorescence and oil stain, and the log responses indicated the sandstone being oil filled. MDT pressure points was not conclusive due to poor reservoir quality, but oil was sampled at 1507.1 m and water at 1548 m.The Heimdal Formation was not present.Good quality Viking Group sandstone and Basement Group granite reservoirs were encountered in the primary target. Shows were observed on core chips and sidewall cores in the interval 2016 to 2047 m, including odour, oil stains, fluorescence, and oil seeping from SWC’s. MDT pressure points confirmed an oil and a water gradient in the Viking Group. Oil was sampled at 2023.8 m and water at 2042.7 m, and the oil and water gradients intersect at ca 2029 m.Four cores were cut. Core 1 was cut in the Grid Formation from 1510.9 to 1537.9 m. Cores 2 to 4 were cut in the interval 2023.2 to 2104.3 m in Intra-Draupne and Intra-Heather sandstones and upper part of Basement. The core-log depth shifts are 0.9 m, 6.2 m, 0.6 m, and 2.05 m respectively for core 1, 2, 3, and 4. MDT fluid samples were taken at 1507.1 m (oil with 8 to 14% OBM contamination) and 1548 m (water) in the Grid Formation, and at 2023.76 m (oil with 8 to 15% OBM contamination) and 2042.7 m (water) in the Viking Group.The well was permanently abandoned on 1 July 2019 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]580.002140.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom11510.01536.0[m ]22017.02035.1[m ]32044.02074.6[m ]42075.52102.4[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]101.6Cores 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 typeCONDUCTOR36202.042203.00.00SURF.COND.20567.036567.01.56FITINTERM.13 3/81355.0161355.01.67FITINTERM.9 5/81999.012 1/41998.01.84LOTOPEN HOLE2140.08 1/22140.00.00 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]AIT PEX HNGS CMR20082125AIT PEX HNGS MSIP QGEO2001355IBC HD CBL7001350MDT19972141MDT CMR13801999MSIP NGI NEXT19972141MWD - ARC TELE203572MWD - ARC TELE19992140MWD - PD ARC TELE5721999MWD - TELE152203XLR20022128ZO VSP1392136 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit1507791005105111431442145318291829186718731885199319991999200420472094 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured5611.2013.0Glydril10561.2014.0Glydril13551.3027.0Versatec13611.2014.0Glydril15361.3031.0Versatec19501.3534.0Versatec19991.3034.0Versatec20021.0512.0Versatec20171.0813.0Versatec20761.0913.0Versatec21401.094.0Versatec -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory2078.0[m]CCGG2083.0[m]CCGG2087.0[m]CCGG