2/9-3
Export: PDF
-
General information
-
Wellbore history
GeneralWell 2/9-3 was drilled on the Piggvar Terrace, between the Central Graben to the west and the Mandal High and the Søgne Basin to the east. The primary objective was to test for hydrocarbons, reservoir quality, and source rock potential and maturation in Late and Middle Jurassic formations. Secondary objectives were to determine the Permian stratigraphy in this portion of the Piggvar Terrace, and the reservoir quality and possible hydrocarbon accumulation in Early Permian Rotliegendes sands.Operations and resultsWildcat well 2/9-3 was spudded with the semi-submersible installation Dyvi Stena on13 September 1989. After drilling to 378 m the hole packed off, and the well had to be re-spudded. The re-spud took place 20 m from the original location on 15 September 1989 and the well was drilled to TD at 4859 m in the Early Permian Rotliegend Group. BHA component failures in the 12.25" and 8.5" hole sections accounted for 9.4 days of lost time, but generally drilling and operations went without significant problems, and the well was drilled within the scheduled time. Possible shallow gas had been warned pre-drill at 160, 425 and 535 m, but no shallow gas was encountered. The well was drilled with seawater and hi-vis pills down to 850 m, with KCl/PHPA/PAC mud from 850 m to 3875 m, and with HRM/polymer mud from 3875 m to TD.The lowermost part of the chalk was of Santonian age. The Coniacian, Turonian and Cenomanian were apparently absent as they where in well 2/9-2. A 12 m thick Early Cretaceous section was penetrated, dating Valanginian to Early Barremian. No evidence of Albian, Aptian and Ryazanian was seen. Top Late Jurassic came in at 3846 m, close to prognosed depth. A seismic event at 4190 m, originally interpreted to mark the top of Middle Jurassic, occurs within the Late Jurassic shale. The Late Jurassic sequence proved to be a good source rock for oil, with maturity in the upper part of the oil window. The well penetrated 57 m of Bryne Formation at 4543 m, and the Triassic section came in at 4600 m, 175 m deep to prognosis. The well drilled from Triassic "Red Beds" directly into the Lower Permian, without any Zechstein salt being penetrated. The Permian section consisted of a brick red and medium grey claystone at the top grading into varicoloured sandstone from 4730 m downwards. This sandstone was fine grained, hard, well cemented with volcanic fragments scattered throughout. The Permian Volcanic Basement was penetrated at 4852 m, and the final TD reached 7 m deeper at 4859 m.Occasional weak shows were seen on claystones and limestone of the Tyne Group from 3874 m down to 4155 m. Shows were recorded on sandstones throughout the interval 4542 m to 4677 m in the Bryne Formation and into the Triassic.Two cores were cut at 4524.6 m to 4552.2 m in the lower part of the Late Jurassic section. Core 1 (10.8 m) consisted of very fine, well cemented and tight sandstone with poor reservoir quality. Core 2 (16.6 m) consisted of claystone/shale with minor siltstone at the top. No fluid samples were taken in the well.The well was permanently abandoned on 14 December 1989 as a dry hole with minor oil shows.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]850.004857.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom14524.64535.4[m ]24535.64552.2[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]27.4Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
-
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit9216233023302330533100315531683168325336603834383438463846412545254525454346004670 -
Geochemical information
Geochemical information Document nameDocument formatDocument size [MB]pdf1.01 -
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]pdf57.30 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL VDL GR5002768CBL VDL GR CCL16602824CST GR30283870CST GR38744848DIL BHC GR CAL8402758DIL BHC GR CAL SP27763873DIL BHC GR MSFL CAL SP38644847LDL CNLGR38644861MWD - GR RES DIR924859RECT45904598RFT GR45284597RFT GR45904599RSCT45264527RSCT45874587RSCT47774777SHDT GR27763875SHDT GR38644848VELOCITY5004843 -
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 typeCONDUCTOR30299.036313.00.00LOTINTERM.20840.026850.01.74LOTINTERM.13 3/82780.017 1/22800.01.87LOTINTERM.9 5/83865.012 1/43875.01.99LOTOPEN HOLE4859.08 1/24859.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured1271.03WATER BASED15.12.19891721.2010.021.5WATER BASED13.09.19892141.039.030.6WATER BASED19.09.19893081.039.024.4WATER BASED19.09.19893131.03WATER BASED19.09.19893131.0310.023.0WATER BASED19.09.19894051.0315.020.1WATER BASED20.09.19897631.03WATER BASED21.09.19898501.03WATER BASED22.09.19898501.03WATER BASED25.09.19898501.03WATER BASED26.09.19898501.2040.09.6WATER BASED25.09.198910471.2016.04.8WATER BASED27.09.198913731.2813.04.8WATER BASED28.09.198915601.5627.05.3WATER BASED29.09.198918951.5622.03.8WATER BASED03.10.198920901.5624.06.2WATER BASED03.10.198925001.5629.010.0WATER BASED03.10.198926981.5624.05.7WATER BASED03.10.198928001.5726.07.2WATER BASED04.10.198928001.5730.06.7WATER BASED05.10.198928001.5729.04.3WATER BASED06.10.198928001.6225.05.3WATER BASED10.10.198928001.6225.04.8WATER BASED10.10.198928001.6223.04.3WATER BASED10.10.198928001.6221.04.3WATER BASED11.10.198928001.6024.04.3WATER BASED10.10.198928031.6224.06.7WATER BASED12.10.198930161.6232.09.6WATER BASED13.10.198931171.6228.06.2WATER BASED16.10.198932011.6223.06.7WATER BASED16.10.198933051.6221.06.7WATER BASED16.10.198933211.6218.04.8WATER BASED17.10.198934351.6222.05.7WATER BASED18.10.198935461.6221.06.7WATER BASED19.10.198936321.6225.05.3WATER BASED23.10.198936321.6225.05.3WATER BASED23.10.198936961.6223.06.7WATER BASED23.10.198936961.6223.06.7WATER BASED23.10.198937781.6224.05.7WATER BASED23.10.198937781.6224.05.7WATER BASED23.10.198937821.6221.05.3WATER BASED24.10.198938071.6222.05.3WATER BASED25.10.198938071.6221.05.7WATER BASED27.10.198938081.6222.05.3WATER BASED27.10.198938311.6224.05.7WATER BASED30.10.198938311.6223.06.7WATER BASED30.10.198938391.6224.05.3WATER BASED30.10.198938411.6223.04.3WATER BASED02.11.198938431.6222.05.3WATER BASED02.11.198938431.6220.03.8WATER BASED02.11.198938591.031.0WATER BASED14.12.198938671.6225.03.3WATER BASED03.11.198938751.6321.03.3WATER BASED06.11.198938751.6221.04.3WATER BASED07.11.198938751.6221.03.3WATER BASED06.11.198938751.6224.04.8WATER BASED08.11.198938751.6223.05.3WATER BASED09.11.198938761.6320.03.3WATER BASED06.11.198938771.8019.03.8WATER BASED10.11.198938781.8021.02.9WATER BASED13.11.198939011.8025.07.2WATER BASED13.11.198939751.8026.03.8WATER BASED13.11.198940401.8028.03.8WATER BASED14.11.198941071.8027.03.8WATER BASED15.11.198941691.8027.03.8WATER BASED16.11.198942001.8025.03.3WATER BASED17.11.198942181.8025.03.3WATER BASED20.11.198942941.8024.03.8WATER BASED20.11.198943531.8023.03.8WATER BASED20.11.198944131.8022.03.8WATER BASED21.11.198944881.8020.03.3WATER BASED22.11.198945241.8022.03.3WATER BASED23.11.198945241.8020.03.3WATER BASED24.11.198945361.8019.03.8WATER BASED28.11.198945641.8017.03.3WATER BASED28.11.198946141.8019.03.3WATER BASED28.11.198946821.8220.04.8WATER BASED28.11.198947151.8219.04.3WATER BASED29.11.198947151.8218.03.3WATER BASED30.11.198947721.8218.05.3WATER BASED01.12.198948581.8219.05.3WATER BASED04.12.198948591.8219.04.3WATER BASED04.12.198948591.8217.03.3WATER BASED04.12.198948591.8519.03.3WATER BASED05.12.198948591.8519.03.8WATER BASED06.12.198948621.8521.04.3WATER BASED07.12.198948621.8522.04.8WATER BASED08.12.198948621.8516.03.8WATER BASED11.12.198948621.8518.03.8WATER BASED11.12.198948621.8520.05.3WATER BASED11.12.198948621.85210.05.7WATER BASED12.12.198948621.03WATER BASED13.12.1989 -
Pressure plots
Pressure plots The pore pressure data is sourced from well logs if no other source is specified. In some wells where pore pressure logs do not exist, information from Drill stem tests and kicks have been used. The data has been reported to the NPD, and further processed and quality controlled by IHS Markit.Pressure plots Document nameDocument formatDocument size [MB]pdf0.21