33/12-7
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General information
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Wellbore history
GeneralWell 33/12-7 was designed to drill the Delta structure, a tilted fault block on the Tampen Spur, and was the only commitment well in licence 152. The primary objective was to test the hydrocarbon potential of the Brent group on the Delta structure. A secondary objective was to explore the Statfjord Formation on the same structure. The well was designed as a possible producer in case of a discovery. Shallow gas was predicted at 375 m MSL, 415 m MSL, and possibly in sand lenses on an erosion surface at 456 m MSL.Operations and resultsWildcat well 33/12-7 was spudded with the semi-submersible installation Deepsea Bergen on 22 February 1989 and drilled to TD at 3703 m in Early Jurassic sediments of the Statfjord Formation. After drilling 26" section to 384 m fifteen days rig time were spent trouble shooting and repairing a leak in the BOP. Otherwise operations went without significant problems. The well was drilled with seawater and gel down to 383 m, with Newdrill/PAC/seawater from 383 m to 3034 m, and with gel/lignosulphonate from 3034 m to TD. No shallow gas was encountered in the well.Sands were encountered in the Tarbert, Rannoch, Cook and Statfjord Formations. No shows of hydrocarbons were recorded while drilling, except for some residuals in the Cook Formation. Post-well organic geochemical analyses established that the Draupne Formation has potential for generation of oil and gas and that the Heather Formation has potential for condensate/light oil and gas. Draupne is immature and Heather marginally mature in the well location. Tarbert and Cook Formations were analysed for migrated hydrocarbons but no significant abundance were found.One core was cut in the interval 3041 m to 3057.5 m. No fluid sampling was attempted.The well was permanently abandoned on 27 April 1989 as a dry hole.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]390.003703.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom13035.03051.5[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]16.5Cores 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 typeCONDUCTOR30222.036225.00.00LOTINTERM.20363.026384.01.43LOTINTERM.13 3/81610.017 1/21625.01.76LOTINTERM.9 5/83017.012 1/43034.01.85LOTOPEN HOLE3703.08 1/23703.00.00LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL VDL1601600CBL VDL14003018CDL CNL GR30173701CDL GR3643036DIFF.TEMP15051848DIFL ACL GR3643688DIPLOG30173701FMT33883041MWD - GR RES DIR2263703SWC GR32953670VELOCITY13003680 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit16392794617841784186120072027292029272927297630223022323532483296330633063387347235303660 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.53 -
Geochemical information
Geochemical information Document nameDocument formatDocument size [MB]pdf1.70 -
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]pdf23.60 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured2081.05WATER BASED23.02.19892251.0525.023.9WATER BASED27.02.19893321.0525.023.9WATER BASED27.02.19893831.0525.023.9WATER BASED27.02.19893841.1012.03.8WATER BASED03.03.19893841.1010.03.8WATER BASED28.02.19897731.1014.03.8WATER BASED16.03.198912181.2016.03.4WATER BASED17.03.198915451.2021.03.9WATER BASED20.03.198915481.2021.03.8WATER BASED20.03.198916131.2016.02.4WATER BASED20.03.198916251.2016.03.8WATER BASED20.03.198916251.2015.03.4WATER BASED21.03.198916251.1217.03.8WATER BASED22.03.198916251.2017.04.3WATER BASED20.03.198916251.1312.03.8WATER BASED28.03.198916301.2712.03.8WATER BASED28.03.198918271.2720.03.8WATER BASED28.03.198921391.2720.04.5WATER BASED28.03.198923881.2719.03.4WATER BASED28.03.198924221.2718.03.8WATER BASED28.03.198924241.2718.03.4WATER BASED28.03.198924391.2715.03.8WATER BASED29.03.198925111.2718.02.9WATER BASED29.03.198925871.2721.03.8WATER BASED29.03.198926281.2720.03.8WATER BASED30.03.198926821.2717.03.4WATER BASED30.03.198927301.2720.02.8WATER BASED30.03.198927601.2719.02.8WATER BASED30.03.198928211.2716.03.4WATER BASED31.03.198928791.2713.03.9WATER BASED31.03.198929041.2713.03.4WATER BASED03.04.198929171.2815.03.9WATER BASED03.04.198929371.5219.05.3WATER BASED03.04.198929611.5218.05.7WATER BASED03.04.198929761.5218.06.2WATER BASED03.04.198930341.5216.05.3WATER BASED03.04.198930341.5517.05.3WATER BASED06.04.198930341.5516.05.3WATER BASED05.04.198930341.5217.04.8WATER BASED04.04.198930341.5518.04.8WATER BASED07.04.198930351.4718.04.8WATER BASED10.04.198930521.4727.05.3WATER BASED10.04.198930541.4725.05.3WATER BASED10.04.198931701.4727.06.2WATER BASED11.04.198931701.4727.06.2WATER BASED11.04.198932911.4728.06.2WATER BASED12.04.198933151.4728.04.7WATER BASED13.04.198933831.4731.04.3WATER BASED14.04.198934721.4734.04.7WATER BASED17.04.198934721.4734.04.7WATER BASED17.04.198934721.4734.04.7WATER BASED17.04.198935051.4735.03.8WATER BASED17.04.198935051.4735.03.8WATER BASED17.04.198935051.4735.03.8WATER BASED17.04.198935831.4733.04.8WATER BASED17.04.198935831.4733.04.8WATER BASED17.04.198935831.4733.04.8WATER BASED17.04.198935951.4734.04.8WATER BASED18.04.198936281.4733.03.8WATER BASED18.04.198936501.4732.05.3WATER BASED19.04.198937031.4736.05.3WATER BASED20.04.198937031.4736.05.3WATER BASED20.04.198937031.4736.03.4WATER BASED21.04.198937031.4735.04.8WATER BASED24.04.198937031.4734.03.4WATER BASED19.04.1989 -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory1700.0[m]DCSTRAT1800.0[m]DCSTRAT1830.0[m]DCSTRAT1860.0[m]DCSTRAT1890.0[m]DCSTRAT2010.0[m]DCSTRAT2020.0[m]DCSTRAT2030.0[m]DCSTRAT2060.0[m]DCSTRAT2100.0[m]DCSTRAT2140.0[m]DCSTRAT2180.0[m]DCSTRAT2220.0[m]DCSTRAT2260.0[m]DCSTRAT2300.0[m]DCSTRAT2340.0[m]DCSTRAT2380.0[m]DCSTRAT2420.0[m]DCSTRAT2460.0[m]DCSTRAT2500.0[m]DCSTRAT2540.0[m]DCSTRAT2580.0[m]DCSTRAT2620.0[m]DCSTRAT2660.0[m]DCSTRAT2700.0[m]DCSTRAT2740.0[m]DCSTRAT2780.0[m]DCSTRAT2820.0[m]DCSTRAT2859.0[m]DCSTRAT2901.0[m]DCSTRAT2916.0[m]DCSTRAT2922.0[m]DCSTRAT2928.0[m]DCSTRAT2931.0[m]DCSTRAT2946.0[m]DCSTRAT2961.0[m]DCSTRAT2976.0[m]DCSTRAT2991.0[m]DCSTRAT3006.0[m]DCSTRAT3021.0[m]DCSTRAT3027.0[m]DCSTRAT3039.7[m]CSTAT3040.3[m]CSTAT3046.6[m]CSTAT3050.7[m]CSTAT3069.0[m]DCSTRAT3081.0[m]DCSTRAT3096.0[m]DCSTRAT3111.0[m]DCSTRAT3126.0[m]DCSTRAT3141.0[m]DCSTRAT3156.0[m]DCSTRAT3171.0[m]DCSTRAT3186.0[m]DCSTRAT3201.0[m]DCSTRAT3216.0[m]DCSTRAT3231.0[m]DCSTRAT3237.0[m]DCSTRAT3246.0[m]DCSTRAT3252.0[m]DCSTRAT3267.0[m]DCSTRAT3282.0[m]DCSTRAT3288.0[m]DCSTRAT3294.0[m]DCSTRAT3303.0[m]DCSTRAT3318.0[m]DCSTRAT3333.0[m]DCSTRAT3348.0[m]DCSTRAT3363.0[m]DCSTRAT3378.0[m]DCSTRAT3389.0[m]SWCSTAT3399.3[m]SWCSTAT3407.0[m]SWCSTAT3417.0[m]SWCSTAT3427.5[m]SWCSTAT3441.0[m]SWCSTAT3461.0[m]SWCSTAT3473.0[m]SWCSTAT3484.0[m]SWCSTAT3489.0[m]DCSTRAT3504.0[m]DCSTRAT3519.0[m]DCSTRAT3525.0[m]DCSTRAT3540.0[m]DCSTRAT3555.0[m]DCSTRAT3570.0[m]DCSTRAT3585.0[m]DCSTRAT3600.0[m]DCSTRAT3615.0[m]DCSTRAT3630.0[m]DCSTRAT3645.0[m]DCSTRAT3662.0[m]SWCSTAT3664.0[m]SWCSTAT3678.0[m]DCSTRAT3693.0[m]DCSTRAT3703.0[m]DCSTRAT