2/11-8
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General information
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Wellbore history
GeneralWell 2/11-8 was designed to drill on the western part of block 2/11, approximately 2.3 km north of the Norwegian-Danish sector line. The well was located in the western part of the Ål Basin, separated from the Grensen Nose to the west by a series of faults. The primary target was sandstone of Late Jurassic age. Pre-Late Jurassic sandstones, probably Permian, were considered the secondary target. The main objectives for well 2/11-8 were to prove hydrocarbons in the target Formations; to define the reservoir level and reservoir quality adjacent to the Grensen Nose; and to collect geological information important for further reservoir evaluation and geological modelling in the area. Seismic amplitude anomalies were present at 347 m, 435 m, and 597 m. Shallow gas could not be excluded at these levels so an 8 1/2" pilot hole was planned to be drilled. The total depth of the well was planned to be at 4616 m, in igneous rocks of Permian age.Operations and resultsWildcat well 2/11-8 was spudded with the semi-submersible installation Polar Pioneer on April 3 1991 and drilled to a total depth of 4584 m in clastic rocks of Carboniferous to possible Devonian age. The well was drilled with spud mud down to 1018 m, with ANCOQUAT cation polymer mud from 1018 m to 2515 m, with KCl mud from 2515 m to 3717 m, and with HPHT mud from 3717 m to TD.The only Late Jurassic (Ryazanian to Volgian) sediments encountered in the well were 3 m of carbonaceous claystone, representing the Mandal Formation of the Tyne Group. The thin Jurassic section rested unconformably on Carboniferous sediments. Poor shows were observed in the Jurassic claystones as well as in carbonaceous claystones between 4265 m to 4335 m in the Carboniferous. A single 10 m core was cut at TD for stratigraphic purposes. The core recovered claystones with minor sandstone interbeds and stringers of limestone and was dated to possible Devonian. No fluid samples were taken. The well was permanently abandoned as a dry hole on 11 July 1991.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]1020.004582.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom14574.04583.9[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]9.9Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
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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 typeCONDUCTOR30174.036174.00.00LOTINTERM.18 5/81000.0241015.02.06LOTINTERM.13 3/82500.017 1/22515.01.98LOTINTERM.9 5/84147.012 1/44164.02.17LOTOPEN HOLE4584.08 1/84584.00.00LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CST GR41554572CST GR41554572DIL LSS GR SP AMS41504581DIL LSS LDL GR SP AMS9992518FMS4 AMS41504583LDL CNL GR CAL AMS41504581LSS GR24974140MWD - GR RES DIR884298MWD - LWD CDR GR DIR175650RFT GR43204568VDL GR19722483VDL GR36984127VSP19453845VSP36754580 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit8915102949294929683014305530753075314233903852386939503950398240704168426542654268 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.55 -
Geochemical information
Geochemical information Document nameDocument formatDocument size [MB]pdf0.70 -
Documents – reported by the production licence (period for duty of secrecy expired)
Documents – reported by the production licence (period for duty of secrecy expired) Document nameDocument formatDocument size [MB]pdf17.20 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured1401.05WATER BASED1741.20WATER BASED2161.20WATER BASED7501.6019.0WATER BASED7551.08WATER BASED10151.20WATER BASED10181.6027.0WATER BASED13761.6025.0WATER BASED19841.6039.0WATER BASED22351.7017.0WATER BASED22591.6035.0WATER BASED25151.6027.0WATER BASED27371.5224.0WATER BASED29581.5226.0WATER BASED30091.5223.0WATER BASED30681.5220.0WATER BASED30801.5224.0WATER BASED31401.5124.0WATER BASED32301.4523.0WATER BASED32451.4522.0WATER BASED33131.4522.0WATER BASED33201.4524.0WATER BASED34841.4524.0WATER BASED36331.4521.0WATER BASED36501.4518.0WATER BASED36871.4519.0WATER BASED37171.5019.0WATER BASED37231.6020.0WATER BASED37481.6017.0WATER BASED37661.6020.0WATER BASED37671.6220.0WATER BASED38191.6120.0WATER BASED38501.6020.0WATER BASED38521.6118.0WATER BASED38841.6018.0WATER BASED38861.6019.0WATER BASED39081.6017.0WATER BASED39721.6016.0WATER BASED39851.6016.0WATER BASED40371.6016.0WATER BASED40851.7016.0WATER BASED40881.6016.0WATER BASED41631.7018.0WATER BASED41701.7017.0WATER BASED41871.7019.0WATER BASED42511.7015.0WATER BASED42761.7118.0WATER BASED43051.7017.0WATER BASED43531.7017.0WATER BASED43531.7017.0WATER BASED44411.8018.0WATER BASED45841.8917.0WATER BASED -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory1710.0[m]DCRRI1740.0[m]DCRRI1800.0[m]DCRRI1830.0[m]DCRRI1860.0[m]DCRRI1890.0[m]DCRRI1920.0[m]DCRRI1950.0[m]DCRRI1980.0[m]DCRRI2010.0[m]DCRRI2040.0[m]DCRRI2070.0[m]DCRRI2810.0[m]DCRRI2840.0[m]DCRRI2870.0[m]DCRRI2990.0[m]DCRRI3020.0[m]DCRRI3135.0[m]DCRRI3770.0[m]DCRRI3845.0[m]DCRRI3860.0[m]DCRRI3875.0[m]DCRRI3890.0[m]DCRRI3905.0[m]DCRRI3920.0[m]DCRRI3935.0[m]DCRRI3950.0[m]DCRRI3965.0[m]DCRRI3980.0[m]DCRRI4000.0[m]DCRRI4010.0[m]DCRRI4020.0[m]DCRRI4040.0[m]DCRRI4055.0[m]DCRRI4070.0[m]DCRRI4085.0[m]DCRRI4100.0[m]DCRRI4115.0[m]DCRRI4130.0[m]DCRRI4165.0[m]SWCRRI4180.0[m]SWCRRI4230.0[m]SWCRRI4255.0[m]SWCRRI4263.0[m]SWCRRI4264.0[m]SWCRRI4266.0[m]SWCRRI4267.0[m]SWCRRI4270.0[m]SWCRRI4278.0[m]SWCRRI4280.0[m]SWCRRI4290.0[m]SWCRRI4295.0[m]SWCRRI4300.0[m]SWCRRI4305.0[m]SWCRRI4310.0[m]SWCRRI4313.0[m]SWCRRI4318.0[m]SWCRRI4320.0[m]SWCRRI4327.0[m]DCRRI4330.0[m]SWCRRI4335.0[m]SWCRRI4352.0[m]DCRRI4355.0[m]SWCRRI4372.0[m]SWCRRI4390.0[m]DCRRI4405.0[m]SWCRRI4412.0[m]DCRRI4427.0[m]DCRRI4430.0[m]SWCRRI4438.0[m]SWCRRI4445.0[m]SWCRRI4450.0[m]DCRRI4457.0[m]SWCRRI4480.0[m]DCRRI4489.0[m]SWCRRI4500.0[m]SWCRRI4510.0[m]DCRRI4515.0[m]SWCRRI4521.0[m]SWCRRI4532.0[m]SWCRRI4540.0[m]DCRRI4540.0[m]SWCRRI4552.0[m]SWCRRI4562.0[m]DCRRI4562.0[m]SWCRRI4572.0[m]DCRRI4574.1[m]CRRI4583.9[m]CRRI