30/9-14
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General information
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Wellbore history
GeneralWell 30/9-14 is located in the western part of block 30/9, on the Southern Oseberg complex. The primary objectives of the well were to appraise oil within the G-North prospect and verify the potential resources of the G-North and G-West prospect, leaving a minimum of untested resources up dip of the well on the G-North prospect; to define fluid contacts, primarily the OWC in the Tarbert Formation; and to verify the structural mapping, depth conversion and the geological model for the G-North area. Secondary objectives were to verify the lateral extent of the lower Heather sand, to test a possible hydrocarbon potential within the Ness and ORE (Oseberg/Rannoch/Etive) Formations, and to obtain a good well tie of the base Brent reflector and the intra Dunlin reflector.Operations and resultsAppraisal well 30/9-14 was spudded with the semi-submersible installation "Polar Pioneer" on 16 March 1993 and drilled to total depth at 3680 m in the Early Jurassic Drake Formation. The well was drilled water based with sea water and hi-vis pills in the 36", 24", and 17 1/2" sections, down to 1040 m, and with a KCl / PHPA / Polymer mud from 104 m to TD. Sedimentological and lithological development was similar to 30/9-13 S, but approximately 250 m of Early Oligocene sand encountered in well 30/9-13 S was not present in well 30/9-14 where the same interval is dominated by clay stone. The Viking Group came in at 2967 m and the Top Tarbert Formation came in at 3059.5 m, 84 m deeper than prognosis due to too low velocities in the Tertiary section. Sixty-six m of Intra Heather Sandstone was verified from 2993.5 m to 3059.5 m. Poor to moderate shows were observed in the Draupne and Heather Formations from 2968.5 m to 3059.5 m. Moderate to good shows were seen from 3059.6 m to 3130 m in the Tarbert Formation. Good shows (residual oil) were also observed in the ORE Formation from 3503 - 3514 m. The Lower Heather and upper Tarbert Formations were proven to be gas bearing, with a GDT at 3163 m. Oil was encountered in Tarbert with an OWC at 3218 m. There was a four bar pressure difference, in the oil zone, between 30/9-13S and 30/9-14. The water gradient was similar to 30/9-13S. Eight conventional cores with near 100% recovery were cut in the interval 2968 m to 3219 m (Draupne, Heather, and Tarbert Formations). Three further cores were cut from 3470 m to 3534 m (Ness, ORE, and Drake Formations). Wireline MDT samples were recoverd from 3154.3 m (Tarbert Formation, water), 3126 m (Tarbert Formation, oil), and 3060.5 m (top Tarbert, Gas). An additional RFT sample containing gas was recovered from 3060.5 m. The well was plugged back and permanently abandoned as an oil and gas appraisal well on 14 May 1993.TestingThe well was production tested from two intervals. Test no. 1 was perforated at 3144.5 m - 3157.5 m and produced water. Test no. 2 was perforated at 3084.0 m - 3127.0 m and produced saturated oil. Production test no. 1 was interpreted to flow from a net pay interval of 22.5 m with an average permeability of 478 mD. Test no. 2 was producing from a net pay interval of 14.25 m with an average permeability of 123 mD. -
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]490.003680.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12968.52980.0[m ]22981.02985.4[m ]32985.53003.0[m ]43003.53031.0[m ]53031.13058.0[m ]63058.53113.0[m ]73113.13166.0[m ]83166.23218.0[m ]93470.03500.0[m ]103500.03500.4[m ]113503.03534.1[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]308.4Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
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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 availableDSTTEST23127.003084.00OIL04.05.1993 - 01:06YES -
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 typeCONDUCTOR30217.036217.00.00LOTINTERM.18 5/8471.024478.01.88LOTINTERM.13 5/81031.017 1/21040.01.44LOTINTERM.9 5/82900.012 1/42912.01.77LOTLINER73680.08 1/23680.00.00LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CST GR10482909CST GR29183667CST GR32693667CST GR32863672CST GR32893680DLL LSS LDL SP ACT GR9352889DLL LSS SP CAL AMS GR1301036DLL MSFL DSI NGT SP AMS GR29023678GHMT AMS GR29013672LDL CNL FMI GR29023681MDT GR29933501MWD DPR - YGR DPR DIR22222903MWD RGD - YGR RES DIR1303577RFT HP AMS GR29003515VSP12003590 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit13063784092310121443147815381571214121412200226524382438268229192919295529652968296829742994306030603236350935123512 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.75 -
Geochemical information
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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]pdf27.74 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured1801.1317.08.0WATER BASED18.05.19931801.1316.011.0WATER BASED18.05.19934561.2011.022.0WATER BASED23.03.19934781.20WATER BASED23.03.19934781.20WATER BASED23.03.19938001.1318.011.0WATER BASED13.05.19939211.205.010.0WATER BASED23.03.19939931.106.09.0WATER BASED25.03.199310401.206.09.0WATER BASED24.03.199310431.106.09.0WATER BASED26.03.199311881.1019.09.5WATER BASED30.03.199313691.3222.011.5WATER BASED30.03.199319951.3526.012.0WATER BASED30.03.199321651.05WATER BASED17.03.199321651.05WATER BASED18.03.199321651.05WATER BASED19.03.199322311.3525.014.0WATER BASED30.03.199325161.3526.010.0WATER BASED31.03.199328601.3526.012.5WATER BASED31.03.199329001.1315.08.0WATER BASED11.05.199329121.3631.012.0WATER BASED01.04.199329691.1522.07.0WATER BASED06.04.199331411.1517.014.0WATER BASED03.05.199331411.1317.012.0WATER BASED03.05.199331411.1315.09.0WATER BASED10.05.199331411.1314.011.0WATER BASED10.05.199334701.1614.09.5WATER BASED14.04.199335001.1613.08.5WATER BASED16.04.199335341.1614.010.0WATER BASED16.04.199336681.1913.011.5WATER BASED26.04.199336681.1915.011.0WATER BASED26.04.199336681.1915.011.0WATER BASED26.04.199336681.1915.011.0WATER BASED27.04.199336801.1915.012.0WATER BASED21.04.199336801.1915.012.0WATER BASED21.04.199336801.1915.012.0WATER BASED21.04.199336801.1915.012.0WATER BASED21.04.199336801.1914.012.0WATER BASED21.04.199336801.1912.012.5WATER BASED22.04.199336801.1913.011.0WATER BASED23.04.1993 -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory500.0[m]DCGEOST520.0[m]DCGEOST540.0[m]DCGEOST560.0[m]DCGEOST580.0[m]DCGEOST600.0[m]DCGEOST620.0[m]DCGEOST640.0[m]DCGEOST660.0[m]DCGEOST680.0[m]DCGEOST700.0[m]DCGEOST720.0[m]DCGEOST740.0[m]DCGEOST760.0[m]DCGEOST780.0[m]DCGEOST800.0[m]DCGEOST820.0[m]DCGEOST840.0[m]DCGEOST860.0[m]DCGEOST880.0[m]DCGEOST900.0[m]DCGEOST910.0[m]DCGEOST940.0[m]DCGEOST960.0[m]DCGEOST980.0[m]DCGEOST1000.0[m]DCGEOST1020.0[m]DCGEOST1040.0[m]DCGEOST1048.5[m]SWCHYDRO1080.0[m]DCGEOST1100.0[m]DCGEOST1120.0[m]DCGEOST1140.0[m]DCGEOST1160.0[m]DCGEOST1180.0[m]DCGEOST1200.0[m]DCGEOST1220.0[m]DCGEOST1240.0[m]DCGEOST1260.0[m]DCGEOST1280.0[m]DCGEOST1300.0[m]DCGEOST1320.0[m]DCGEOST1350.0[m]DCGEOST1360.0[m]DCGEOST1380.0[m]DCGEOST1400.0[m]DCGEOST1420.0[m]DCGEOST1441.5[m]SWCHYDRO1460.0[m]DCGEOST1481.0[m]SWCHYDRO1500.0[m]DCGEOST1520.0[m]DCGEOST1530.0[m]SWCHYDRO1560.0[m]DCGEOST1572.5[m]SWCHYDRO1600.0[m]DCGEOST1620.0[m]DCGEOST1640.0[m]DCGEOST1660.0[m]DCGEOST1680.0[m]DCGEOST1698.0[m]SWCHYDRO1720.0[m]DCGEOST1730.0[m]DCGEOST1740.0[m]DCGEOST1760.0[m]DCGEOST1780.0[m]DCGEOST1800.0[m]DCGEOST1820.0[m]DCGEOST1840.0[m]DCGEOST1860.0[m]DCGEOST1870.0[m]SWCHYDRO1900.0[m]DCGEOST1922.0[m]SWCHYDRO1930.0[m]DCGEOST1960.0[m]DCGEOST1980.0[m]DCGEOST2000.0[m]DCGEOST2020.0[m]DCGEOST2038.5[m]SWCHYDRO2060.0[m]DCGEOST2080.0[m]DCGEOST2100.0[m]DCGEOST2120.0[m]DCGEOST2125.5[m]SWCHYDRO2140.0[m]DCGEOST2150.0[m]DCGEOST2151.0[m]SWCHYDRO2160.0[m]DCGEOST2170.0[m]DCGEOST2190.0[m]DCGEOST2210.0[m]SWCHYDRO2235.0[m]SWCHYDRO2240.0[m]DCGEOST2260.0[m]DCGEOST2280.0[m]DCGEOST2300.0[m]DCGEOST2320.0[m]DCGEOST2340.0[m]DCGEOST2358.0[m]SWCHYDRO2381.0[m]SWCHYDRO2400.0[m]DCGEOST2420.0[m]DCGEOST2440.0[m]DCGEOST2460.0[m]DCGEOST2480.0[m]DCGEOST2500.0[m]DCGEOST2520.0[m]DCGEOST2540.0[m]DCGEOST2560.0[m]DCGEOST2580.0[m]DCGEOST2600.0[m]DCGEOST2620.0[m]DCGEOST2640.0[m]DCGEOST2660.0[m]DCGEOST2680.0[m]DCGEOST2700.0[m]DCGEOST2720.0[m]DCGEOST2740.0[m]DCGEOST2760.0[m]DCGEOST2780.0[m]DCGEOST2800.0[m]DCGEOST2836.5[m]SWCHYDRO2850.0[m]DCGEOST2870.0[m]DCGEOST2890.0[m]DCGEOST2900.0[m]DCGEOST2910.0[m]DCGEOST2915.0[m]DCGEOST2925.0[m]SWCHYDRO2935.0[m]DCGEOST2945.0[m]DCGEOST2955.0[m]DCGEOST2959.0[m]SWCHYDRO2960.0[m]DCGEOST2962.0[m]DCGEOST2964.0[m]SWCHYDRO2965.0[m]DCGEOST2965.5[m]SWCHYDRO2967.5[m]SWCHYDRO2968.5[m]CGEOST2970.0[m]DCGEOST2973.0[m]CGEOST2973.5[m]CGEOST2980.0[m]DCGEOST2981.0[m]CGEOST2990.6[m]CGEOST2991.5[m]CGEOST2995.5[m]CGEOST3005.3[m]CGEOST3015.0[m]CGEOST3024.0[m]CGEOST3032.6[m]CGEOST3041.0[m]CGEOST3050.5[m]CGEOST3058.0[m]CGEOST3059.5[m]CGEOST3068.9[m]CHYDRO3079.0[m]CHYDRO3088.5[m]CHYDRO3098.7[m]CHYDRO3106.8[m]CHYDRO3114.1[m]CHYDRO3124.0[m]CHYDRO3132.1[m]CHYDRO3134.7[m]CHYDRO3144.0[m]CHYDRO3158.2[m]CHYDRO3161.6[m]CHYDRO3167.9[m]CHYDRO3178.9[m]CHYDRO3187.3[m]CGEOST3194.3[m]CGEOST3204.3[m]CGEOST3213.8[m]CGEOST3222.5[m]SWCHYDRO3232.0[m]SWCHYDRO3239.0[m]SWCHYDRO3254.0[m]SWCHYDRO3257.0[m]SWCHYDRO3262.0[m]DCGEOST3269.0[m]SWCHYDRO3274.0[m]SWCHYDRO3280.0[m]SWCHYDRO3287.0[m]DCGEOST3295.0[m]DCGEOST3298.5[m]SWCHYDRO3302.0[m]DCGEOST3310.0[m]DCGEOST3312.5[m]SWCHYDRO3317.0[m]DCGEOST3320.0[m]SWCHYDRO3326.0[m]SWCHYDRO3332.0[m]DCGEOST3334.5[m]SWCHYDRO3339.5[m]SWCHYDRO3340.0[m]DCGEOST3347.0[m]DCGEOST3347.5[m]SWCHYDRO3353.5[m]SWCHYDRO3355.0[m]DCGEOST3359.5[m]SWCHYDRO3362.0[m]DCGEOST3369.5[m]SWCHYDRO3370.0[m]DCGEOST3377.0[m]DCGEOST3380.5[m]SWCHYDRO3384.5[m]SWCHYDRO3385.0[m]DCGEOST3392.0[m]DCGEOST3397.0[m]SWCHYDRO3400.0[m]DCGEOST3406.0[m]SWCHYDRO3413.0[m]SWCHYDRO3422.0[m]SWCHYDRO3429.0[m]SWCHYDRO3437.0[m]SWCHYDRO3447.0[m]SWCHYDRO3455.0[m]DCGEOST3461.0[m]SWCHYDRO3470.0[m]CGEOST3475.0[m]CGEOST3485.0[m]CGEOST3489.4[m]CGEOST3503.9[m]CGEOST3507.9[m]CGEOST3516.0[m]CGEOST3525.0[m]CGEOST3533.9[m]CGEOST3539.5[m]SWCHYDRO3548.5[m]SWCHYDRO3550.0[m]DCGEOST3555.5[m]SWCHYDRO3566.5[m]SWCHYDRO3578.5[m]SWCHYDRO3587.5[m]SWCHYDRO3604.5[m]SWCHYDRO3612.5[m]SWCHYDRO3624.5[m]SWCHYDRO3625.0[m]DCGEOST3635.0[m]DCGEOST3639.5[m]SWCHYDRO3645.0[m]DCGEOST3657.5[m]SWCHYDRO3670.0[m]DCGEOST3672.5[m]SWCHYDRO3680.0[m]SWCHYDRO3680.0[m]DCGEOST