2/2-4
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General information
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Wellbore history
GeneralWell 2/2-4 was drilled on the northern segment of the Alpha structure in the southeastern corner of block 2/2 on the northeastern flank of the Central Graben in the Ula-Gyda Fault zone. The structure is a salt induced dome in an area exposed to extensional tectonism where rollover mechanism may have influenced the final structure. The southern segment well 2/2-1, separated from the northern by a normal fault, proved gas in Oligocene and oil in Late Jurassic sandstones.The main objective of the well was to test the reservoir potential of Late Jurassic Ula Sandstone and to test a possible communication with the Alpha South structure. If hydrocarbon bearing, the objective was to prove an oil column thick enough for commercial exploitation of the Alpha structure.Operations and resultsWildcat well 2/2-4 was spudded with Wilh. Wilhelmsen semi-submersible rig Treasure Saga on16 April 1988 and drilled to TD at 4020 m in the Triassic Smith Bank Formation. The well was drilled with spud mud down to 915 m, with KCl mud from 915 m to 3310 m, and with gel mud from 3310 m to TD. It was drilled down to top Jurassic and 9 5/8" casing was set.Oligocene came in at 2084 m with sand with small amounts of gas. Eight pressure points in the interval gave a water gradient of 1.0 g/cc and a gas gradient of 0.21 g/cc. The gas/water contact was defined at 2110.5 m, the same as in 2/2-1. Estimated porosity from logs was max. 27%. The main target Ula reservoir was encountered at 3324 m, but was found water wet. Only residual oil was found in the uppermost part of the Ula sandstone and in siltstone of the Bryne Formation. No cores were cut. One FMT segregated sample recovered gas from 2109 m in Oligocene. The gas was very dry with 97% methane. The well was abandoned on 7 June 1988 as a gas 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]210.004019.00 -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory2120.0[m]DCRRI2160.0[m]DCRRI2180.0[m]DCRRI2197.0[m]SWCRRI2220.0[m]DCRRI2240.0[m]DCRRI2260.0[m]DCRRI2279.0[m]SWCRRI2300.0[m]DCRRI2320.0[m]DCRRI2660.0[m]DCRRI2690.0[m]DCRRI3218.0[m]SWCRRI3225.0[m]DCRRI3235.0[m]DCRRI3317.0[m]DCRRI3335.0[m]DCRRI3416.0[m]DCRRI3435.0[m]DCRRI3446.0[m]DCRRI3476.0[m]DCRRI3485.0[m]DCRRI3494.0[m]DCRRI3506.0[m]DCRRI3515.0[m]DCRRI3524.0[m]DCRRI3545.0[m]DCRRI3554.0[m]DCRRI3566.0[m]DCRRI3575.0[m]DCRRI3584.0[m]DCRRI3605.0[m]DCRRI3614.0[m]DCRRI3626.0[m]DCRRI3635.0[m]DCRRI3644.0[m]DCRRI3656.0[m]DCRRI3665.0[m]DCRRI3674.0[m]DCRRI3680.0[m]DCRRI3695.0[m]DCRRI3704.0[m]DCRRI3725.0[m]DCRRI3734.0[m]DCRRI3755.0[m]DCRRI3785.0[m]DCRRI3806.0[m]DCRRI3815.0[m]DCRRI3824.0[m]DCRRI3836.0[m]DCRRI3875.0[m]DCRRI3884.0[m]DCRRI3908.0[m]DCGEUS3911.0[m]DCGEUS3914.0[m]DCRRI3917.0[m]DCGEUS3920.0[m]DCGEUS3923.0[m]DCGEUS3926.0[m]DCRRI3935.0[m]DCRRI3944.0[m]DCRRI3968.0[m]DCRRI3986.0[m]DCRRI4016.0[m]DCRRI -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit851574208621842666266626842698277728262826284731353213321333083308331333243324390239693969 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.87 -
Geochemical information
Geochemical information Document nameDocument formatDocument size [MB]pdf1.80 -
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]pdf12.39 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CDL CNL GR23043309CDL CNL GR23043309CDL CNL GR32954020CDL CNL LS BHC GR8982296COREGUN00COREGUN00COREGUN00DIFL LS BHC GR23043310DIFL LS BHC GR32654020DIPLOG23043309DIPLOG33004020DLL MLL GR8982298FMT20862177FMT33273868FMT33273868MWD - GR RES DEV2074020VSP20004020 -
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 typeCONDUCTOR30207.036207.00.00LOTSURF.COND.20897.026915.01.65LOTINTERM.13 3/82304.017 1/22319.01.77LOTINTERM.9 5/83295.012 1/43321.02.04LOTOPEN HOLE4020.08 1/24020.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured1201.4615.04.4WATER BASED07.06.19881231.05WATER BASED18.04.19882071.054.013.0WATER BASED19.04.19884001.134.012.0WATER BASED20.04.19887701.124.012.0WATER BASED22.04.19889151.125.010.1WATER BASED22.04.19889151.15WATER BASED27.04.19889151.154.09.6WATER BASED27.04.198810601.1620.08.7WATER BASED27.04.198814051.2322.09.1WATER BASED27.04.198817301.4024.07.7WATER BASED28.04.198817641.4231.07.7WATER BASED29.04.198819251.4229.06.8WATER BASED02.05.198820351.4226.06.3WATER BASED02.05.198820641.4227.05.8WATER BASED02.05.198822091.4224.05.3WATER BASED03.05.198822451.4223.05.8WATER BASED04.05.198823191.4217.03.9WATER BASED06.05.198823191.4217.03.9WATER BASED09.05.198823191.4218.03.9WATER BASED05.05.198823191.4216.04.4WATER BASED09.05.198824501.4217.05.3WATER BASED10.05.198825981.4521.07.2WATER BASED13.05.198827031.4518.07.7WATER BASED13.05.198827931.4516.04.8WATER BASED16.05.198827931.4519.07.7WATER BASED13.05.198829321.5015.04.8WATER BASED16.05.198830861.5015.04.8WATER BASED16.05.198831001.5220.05.3WATER BASED24.05.198831001.5221.05.8WATER BASED24.05.198831001.5222.04.8WATER BASED24.05.198831461.4615.04.4WATER BASED07.06.198831571.5016.04.4WATER BASED18.05.198831771.5016.04.4WATER BASED18.05.198832261.5218.06.3WATER BASED19.05.198832831.5219.05.3WATER BASED20.05.198833101.5221.05.8WATER BASED24.05.198833211.4815.05.3WATER BASED25.05.198835381.4822.06.3WATER BASED26.05.198837091.4830.08.2WATER BASED30.05.198838591.4832.08.2WATER BASED30.05.198839021.4832.09.1WATER BASED30.05.198840091.4829.07.2WATER BASED30.05.198840201.4823.05.3WATER BASED31.05.198840201.4822.06.3WATER BASED01.06.198840201.4822.06.3WATER BASED02.06.198840201.4621.06.3WATER BASED03.06.198840201.4617.04.4WATER BASED07.06.198840201.4620.05.3WATER BASED07.06.1988 -
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]pdf0.22