30/11-12 S
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General information
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Wellbore history
GeneralWell 30/11-12 S was drilled to test the Askja SE prospect on the eastern flank of the Fensal Sub-basin in the North Sea. The well is situated two kilometres south of the 30/11-9 A (Askja East) discovery, and about 35 km southwest of the Oseberg Sør facility. The primary objective was to prove petroleum in three sandstone layers in Middle Jurassic reservoir rocks (the Tarbert formation).Operations and resultsWildcat well 30/11-12 S was spudded with the semi-submersible installation Songa Delta on 8 April 2016 and drilled to TD at 3700 m in the Middle Jurassic Ness Formation. No significant problem was encountered in the operations. The well was drilled with Seawater and hi-vis pills down to 1324 m and with XP07 oil based mud from 1324 m to TD.The Tarbert Formation was encountered at 3321.5 m (3319.5 m TVD). It was oil bearing from top to a down-to contact at ca 3356 m (3354 m TVD) based on pressure gradients and logs. Oil was sampled also at 3420 m (3418 m), in the top of a deeper Tarbert sandstone unit. MDT pressure points showed a water gradient in this sandstone. Oil shows were described in the hydrocarbon-bearing upper Tarbert sandstone from 3328 to 3360 m. These were the only oil shows recorded in the well.No cores were cut. MDT fluid samples were taken at 3336.4 m (oil), 3420.0 m (oil with trace water and ca 20% OBM contamination), and 3458.5 m (water with trace oil).The well was permanently abandoned on 4 May 2016 as an oil discovery.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]1330.003700.00 -
Oil samples at the Norwegian Offshore Directorate
Oil samples at the Norwegian Offshore Directorate Test typeBottle numberTop depth
MD [m]Bottom depth
MD [m]Fluid typeTest timeSamples availableDST0.000.00YESDST3336.400.00OIL02.09.2016 - 00:00YESDST3420.000.00OIL02.09.2016 - 00:00YES -
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 typeCONDUCTOR30175.336176.00.00SURF.COND.13 3/81315.917 1/21324.01.58FITLINER9 5/83053.012 1/43057.01.53FITOPEN HOLE3700.08 1/23700.00.00 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]AIT HNGS QUANTAGEO MSIP30503700CMR MDT33003650FTWT00MWD - ARCVIS GR RES APWD DIR1763700PEX ECS XPT CMR30403700XL ROCK33183408XL ROCK34093469 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit139413674108514641467165016722035217321732213239024722585258528623042304231173134314831483192332233223599 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured1391.063.0Spud Mud1391.6010.0Bentonite/Polymer mud9341.3010.0Bentonite/Polymer mud12211.3917.0XP-0715301.3820.0XP-0718701.3921.0XP-0730571.3015.0XP-0730571.3921.0XP-0734301.3016.0XP-0737001.2012.0XP-0737001.3016.0XP-07 -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory1330.0[m]DCPETROSTR1360.0[m]DCPETROS1390.0[m]DCPETROS1420.0[m]DCPETROS1450.0[m]DCPETROS1480.0[m]DCPETROS1510.0[m]DCPETROS1540.0[m]DCPETROS1570.0[m]DCPETROS1600.0[m]DCPETROS1630.0[m]DCPETROS1660.0[m]DCPETROS1690.0[m]DCPETROS1720.0[m]DCPETROS1750.0[m]DCPETROS1780.0[m]DCPETROS1810.0[m]DCPETROS1840.0[m]DCPETROS1870.0[m]DCPETROS1900.0[m]DCPETROS1930.0[m]DCPETROS1960.0[m]DCPETROS1990.0[m]DCPETROS2020.0[m]DCPETROS2050.0[m]DCPETROS2070.0[m]DCPETROS2090.0[m]DCPETROS2110.0[m]DCPETROS2130.0[m]DCPETROS2150.0[m]DCPETROS2170.0[m]DCPETROS2190.0[m]DCPETROS2210.0[m]DCPETROS2230.0[m]DCPETROS2250.0[m]DCPETROS2270.0[m]DCPETROS2290.0[m]DCPETROS2310.0[m]DCPETROS2330.0[m]DCPETROS2350.0[m]DCPETROS2370.0[m]DCPETROS2390.0[m]DCPETROS2410.0[m]DCPETROS2430.0[m]DCPETROS2450.0[m]DCPETROS2470.0[m]DCPETROS2490.0[m]DCPETROS2510.0[m]DCPETROS2530.0[m]DCPETROS2550.0[m]DCPETROS2570.0[m]DCPETROS2590.0[m]DCPETROS2620.0[m]DCPETROS2650.0[m]DCPETROS2680.0[m]DCPETROS2710.0[m]DCPETROS2740.0[m]DCPETROS2770.0[m]DCPETROS2800.0[m]DCPETROS2830.0[m]DCPETROS2860.0[m]DCPETROS2890.0[m]DCPETROS2920.0[m]DCPETROS2950.0[m]DCPETROS2980.0[m]DCPETROS3010.0[m]DCPETROS3040.0[m]DCPETROS3050.0[m]DCPETROS3060.0[m]DCPETROS3070.0[m]DCPETROS3080.0[m]DCPETROS3090.0[m]DCPETROS3110.0[m]DCPETROS3120.0[m]DCPETROS3130.0[m]DCPETROS3139.0[m]DCPETROS3148.0[m]DCPETROS3157.0[m]DCPETROS3166.0[m]DCPETROS3175.0[m]DCPETROS3184.0[m]DCPETROS3193.0[m]DCPETROS3202.0[m]DCPETROS3211.0[m]DCPETROS3220.0[m]DCPETROS3229.0[m]DCPETROS3238.0[m]DCPETROS3247.0[m]DCPETROS3256.0[m]DCPETROS3265.0[m]DCPETROS3274.0[m]DCPETROS3283.0[m]DCPETROS3292.0[m]DCPETROS3301.0[m]DCPETROS3310.0[m]DCPETROS3318.0[m]SWCPETROS3319.0[m]SWCPETROS3319.0[m]DCPETROS3325.0[m]DCPETROS3333.0[m]SWCPETROS3334.0[m]DCPETROS3343.0[m]DCPETROS3352.0[m]DCPETROS3361.0[m]DCPETROS3370.0[m]DCPETROS3379.0[m]DCPETROS3388.0[m]DCPETROS3397.0[m]DCPETROS3406.0[m]DCPETROS3415.0[m]DCPETROS3424.0[m]DCPETROS3433.0[m]DCPETROS3442.0[m]DCPETROS3451.0[m]DCPETROS3460.0[m]DCPETROS3469.0[m]DCPETROS3478.0[m]DCPETROS3487.0[m]DCPETROS3496.0[m]DCPETROS3505.0[m]DCPETROS3514.0[m]DCPETROS3523.0[m]DCPETROS3532.0[m]DCPETROS3541.0[m]DCPETROS3550.0[m]DCPETROS3559.0[m]DCPETROS3568.0[m]DCPETROS3577.0[m]DCPETROS3586.0[m]DCPETROS3595.0[m]DCPETROS3604.0[m]DCPETROS3613.0[m]DCPETROS3622.0[m]DCPETROS3631.0[m]DCPETROS3640.0[m]DCPETROS3649.0[m]DCPETROS3658.0[m]DCPETROS3667.0[m]DCPETROS3676.0[m]DCPETROS3685.0[m]DCPETROS3694.0[m]DCPETROS3700.0[m]DCPETROS