30/9-13 S
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General information
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Wellbore history
GeneralThe primary objective of the 30/9-13 S well was to prove hydrocarbon potential in the Tarbert Formation in the G-East prospect, south west of the Oseberg Field. The well should define fluid contacts in the prospect and test the sealing capacity of the eastern fault. The location was chosen to drill through untruncated Tarbert Formation, and it should leave a minimum of untested reserves up dip in order to establish the fluid contacts in the lower part of the Tarbert Formation.As secondary objectives the well should test the resource potential within the Ness, Oseberg, Rannoch, Etive, Cook and Statfjord Formations. The well was planned deviated due to a very high amplitude reflection, resulting in a shallow gaswarning for a sand layer at 496 ± 10 m.Operations and resultsWildcat well 30/9-13 S was spudded with the semi-submersible installation Vildkat Explorer on 5 May 1991 and drilled to a total depth of 4027 m in Early Jurassic Statfjord Formation sandstone. The well was drilled with seawater and hi-vis pills down to 1030 m, with KCl/polymer mud from 1030 m to 3031 m, and with Thermadrill/KCl/polymer mud from 3031 m to TD. The well was drilled vertical to the 13 3/8" casing shoe and was kicked off from there using a steerable motor. A maximum inclination of 31 ° was obtained at 1434 m. At 1483 m the steerable system was pulled and a drop assembly was run in hole to continue drilling. Intra Heather Formation Sandstone was encountered at 2959 m in the 12 l/4" hole before the planned 9 5/8" casing point had been reached. The well was plugged back and casing was set above the hydrocarbon-bearing interval. On drilling out of the casing the well was sidetracked down to the top of the Heather Formation at 2963 m. The greater part of the Heather Formation proved to be sand with a total net gas column of 28.5 m. A total oil reservoir zone of 77 m with a 60 m net pay zone was identified. A Free Oil Level (FOL) was encountered in the Heather Formation and an Oil Water Contact (OWC) was interpreted from logs at 3101 m in the TarbertFormation. The Statfjord Formation consisted of water bearing moderately over pressured sandstones of low permeability. A total of 11 conventional cores were cut continuously from 2957 m through the Heather GOC and the Tarbert OWC down to 3154 m at the base of the Tarbert Formation. Wire line RFT fluid samples were taken at 3097.1 m in the Tarbert Formation (gas/water/mud filtrate), at 3025.6 m in base Heather Formation (gas/water/mud filtrate/trace of oil), at 3997.1 m in the Statfjord Formation (gas/water/mud filtrate), and at 4012.8 m in the Statfjord Formation (water and mud filtrate without any gas or oil). A total of 60 sidewall cores were attempted and 35 were recovered. The well was suspended as an oil and gas discovery on 11 October 1991.TestingTree DST tests were performed. Test 1 was performed in the interval 3086.5 m to 3094.5 m in middle Tarbert yielding a maximum flow rate of 792 Sm3/d oil and 120983 Sm3/d gas through a 19.05 mm choke. Test 2 was performed in the interval 3023.9 m to 3072.9 m in the upper Tarbert yielding a maximum flow rate of 535 Sm3/d oil and 107458 Sm3/d gas through a 19.05 mm choke. Test 3 was performed in the interval 2958.1 m to 2986.1 m in Intra Heather Sandstone and yielded 90 Sm3/d oil and 459552 Sm3/d gas through a 28.575 mm choke. -
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]1030.004027.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12957.02975.0[m ]22975.02985.0[m ]32985.03018.0[m ]43018.03040.7[m ]53041.03066.7[m ]63067.03086.0[m ]73086.03093.6[m ]83095.03122.0[m ]93122.03150.4[m ]103150.23178.0[m ]113179.03188.0[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]228.2Cores 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 availableDSTTEST13086.503094.50OIL14.09.1991 - 14:00YESDSTTEST23023.903072.9029.09.1991 - 15:00YESDSTDST32958.102986.10CONDENSATE04.10.1991 - 10:15YES -
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 typeCONDUCTOR30216.036218.00.00LOTINTERM.13 3/81017.017 1/21020.00.00LOTINTERM.9 5/82876.012 1/42880.01.88LOTLINER74027.08 1/24027.00.00LOT -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.03086309519.02.03024307319.03.02958298628.5Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.01142.01103.086Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.07921209830.8500.7301532.05351074580.8400.7602013.0904595220.7800.7205099 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CST GR24873004CST GR33864021DIL LSS GR SP AMS32864030DIL LSS LDL CNL NGT AMS28743396DIL LSS LDL GR SP AMS10163006DLL MSFL GR SP CAL AMS27003002DLL MSFL GR SP CAL AMS28743391DLL MSFL GR SP CAL AMS39404026FMS4 GR AMS29254029LDL CNL NGT CAL AMS33004030MWD - GR RES DIR2204007RFT HP GR AMS29663097RFT HP GR AMS29733349RFT HP GR AMS31043392RFT HP GR AMS39794008RFT HP GR AMS39874014VSP1313220 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit131656690892944101511601417151515351684170321992199226423342480249324932795290229022926293129432944294429593024302431943437344434523452375838263976 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.62 -
Geochemical information
Geochemical information Document nameDocument formatDocument size [MB]pdf1.94 -
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]pdf18.78 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured2171.05WATER BASED08.07.199110301.20WATER BASED10.07.199110301.20WATER BASED10.07.199110521.1011.09.0WATER BASED15.07.199112051.1214.014.0WATER BASED16.07.199114861.2016.011.0WATER BASED16.07.199114921.2016.011.0WATER BASED16.07.199116851.3220.012.0WATER BASED16.07.199118221.3320.011.0WATER BASED17.07.199119601.3322.013.0WATER BASED18.07.199121351.3223.014.0WATER BASED19.07.199122491.3222.016.0WATER BASED23.07.199124981.3123.015.0WATER BASED23.07.199124981.3224.013.0WATER BASED23.07.199125211.3222.011.0WATER BASED23.07.199125791.3219.010.0WATER BASED24.07.199126101.3318.010.0WATER BASED26.07.199126751.3519.010.0WATER BASED30.07.199127831.3519.09.0WATER BASED30.07.199127861.2711.08.0WATER BASED10.10.199128511.3520.09.0WATER BASED30.07.199128801.3521.011.0WATER BASED02.08.199128901.3520.011.0WATER BASED06.08.199128901.2212.07.0WATER BASED06.08.199129211.2214.09.0WATER BASED06.08.199129631.3523.012.0WATER BASED31.07.199129751.2315.08.0WATER BASED06.08.199129931.2215.08.0WATER BASED07.08.199130001.2610.08.0WATER BASED01.10.199130091.267.07.0WATER BASED07.10.199130091.267.07.0WATER BASED08.10.199130091.2710.08.0WATER BASED01.10.199130091.279.09.0WATER BASED01.10.199130091.294.07.0WATER BASED02.10.199130091.274.07.0WATER BASED03.10.199130091.278.06.0WATER BASED04.10.199130091.279.06.0WATER BASED07.10.199130091.266.04.0WATER BASED07.10.199130091.2711.08.0WATER BASED09.10.199130311.3521.09.0WATER BASED01.08.199130311.3520.09.0WATER BASED02.08.199130331.2220.07.0WATER BASED08.08.199130671.2215.06.0WATER BASED09.08.199130831.268.08.0WATER BASED27.09.199130831.268.06.0WATER BASED23.09.199130831.267.07.0WATER BASED24.09.199130831.268.06.0WATER BASED25.09.199130831.268.08.0WATER BASED27.09.199130831.268.07.0WATER BASED01.10.199130951.2212.06.0WATER BASED12.08.199131221.2214.07.0WATER BASED12.08.199131641.2212.07.0WATER BASED12.08.199131941.2214.08.0WATER BASED14.08.199132231.2213.07.0WATER BASED14.08.199133161.2212.07.0WATER BASED16.08.199133281.2611.05.0WATER BASED10.09.199133281.268.06.0WATER BASED16.09.199133281.2612.07.0WATER BASED10.09.199133281.2611.07.0WATER BASED10.09.199133281.2611.05.0WATER BASED10.09.199133281.2611.05.0WATER BASED12.09.199133281.2610.05.0WATER BASED12.09.199133281.2610.04.0WATER BASED16.09.199133281.2611.05.0WATER BASED16.09.199133281.2612.07.0WATER BASED16.09.199133281.268.06.0WATER BASED17.09.199133281.2612.07.0WATER BASED18.09.199133281.2612.07.0WATER BASED20.09.199133281.268.08.0WATER BASED20.09.199133281.2610.06.0WATER BASED23.09.199133281.269.06.0WATER BASED23.09.199133851.2616.07.0WATER BASED16.08.199133961.2615.07.0WATER BASED20.08.199133961.2615.06.0WATER BASED20.08.199133961.2614.06.0WATER BASED20.08.199133961.2613.05.0WATER BASED22.08.199133961.2615.07.0WATER BASED20.08.199133991.2615.07.0WATER BASED22.08.199134251.2616.07.0WATER BASED23.08.199135441.2616.07.0WATER BASED27.08.199135971.2615.06.0WATER BASED27.08.199137571.2620.08.0WATER BASED27.08.199138601.2618.07.0WATER BASED27.08.199139631.2622.08.0WATER BASED28.08.199139911.2620.08.0WATER BASED29.08.199140271.2618.06.0WATER BASED02.09.199140271.2619.07.0WATER BASED02.09.199140271.2519.08.0WATER BASED02.09.199140271.2519.08.0WATER BASED03.09.199140271.2720.08.0WATER BASED04.09.199140271.2714.08.0WATER BASED06.09.199140271.2620.06.0WATER BASED02.09.199140271.2714.08.0WATER BASED06.09.1991 -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory2120.0[m]DCRRI2150.0[m]DCRRI2180.0[m]DCRRI2210.0[m]DCRRI2240.0[m]DCRRI2270.0[m]DCRRI2300.0[m]DCRRI2340.0[m]DCRRI2410.0[m]DCRRI2480.0[m]DCRRI2487.0[m]SWCHYDRO2510.0[m]DCRRI2540.0[m]DCRRI2570.0[m]DCRRI2605.0[m]DCRRI2660.0[m]DCRRI2720.0[m]DCRRI2750.0[m]DCRRI2780.0[m]DCRRI2810.0[m]DCRRI2840.0[m]DCRRI2870.0[m]DCRRI2902.0[m]DCRRI2922.0[m]SWCHYDRO2929.0[m]SWCRRI2933.0[m]SWCRRI2939.0[m]SWCRRI2943.0[m]SWCRRI2944.0[m]SWCHYDRO2945.0[m]SWCHYDRO2947.0[m]SWCHYDRO2951.0[m]SWCHYDRO2955.0[m]SWCHYDRO2957.0[m]CHYDRO2958.0[m]CHYDRO2959.0[m]CHYDRO2960.0[m]CHYDRO2963.0[m]CHYDRO2965.0[m]CRRI2969.0[m]CHYDRO2969.0[m]SWCHYDRO2973.0[m]CHYDRO2979.0[m]SWCHYDRO2980.0[m]CHYDRO2986.0[m]SWCHYDRO2987.0[m]CHYDRO2992.0[m]CHYDRO2993.0[m]SWCHYDRO2998.0[m]SWCHYDRO2999.0[m]CHYDRO3000.0[m]SWCHYDRO3004.0[m]SWCHYDRO3004.0[m]CHYDRO3005.0[m]DCRRI3009.0[m]CHYDRO3016.0[m]CHYDRO3018.0[m]CHYDRO3020.0[m]CHYDRO3021.0[m]CHYDRO3022.0[m]CHYDRO3024.0[m]CHYDRO3025.0[m]CHYDRO3028.0[m]CHYDRO3032.0[m]DCRRI3033.0[m]CHYDRO3048.0[m]CHYDRO3060.0[m]CHYDRO3071.0[m]CHYDRO3077.0[m]CHYDRO3084.0[m]CHYDRO3085.0[m]CHYDRO3091.0[m]CHYDRO3095.0[m]CHYDRO3100.0[m]CHYDRO3103.0[m]CHYDRO3105.0[m]CHYDRO3115.0[m]CHYDRO3119.0[m]CHYDRO3124.0[m]CHYDRO3128.0[m]CHYDRO3129.0[m]CHYDRO3130.0[m]CRRI3132.0[m]CHYDRO3136.0[m]CHYDRO3142.0[m]CHYDRO3146.0[m]CHYDRO3152.0[m]CHYDRO3157.0[m]CHYDRO3163.0[m]CHYDRO3164.0[m]CHYDRO3169.0[m]CHYDRO3176.0[m]CHYDRO3183.0[m]CHYDRO3187.0[m]CHYDRO3188.0[m]CHYDRO3202.0[m]DCRRI3210.0[m]DCRRI3217.0[m]DCRRI3225.0[m]DCRRI3232.0[m]DCRRI3240.0[m]DCRRI3247.0[m]DCRRI3255.0[m]DCRRI3262.0[m]DCRRI3270.0[m]DCRRI3277.0[m]DCRRI3285.0[m]DCRRI3292.0[m]DCRRI3300.0[m]DCRRI3307.0[m]DCRRI3315.0[m]DCRRI3322.0[m]DCRRI3330.0[m]DCRRI3337.0[m]DCRRI3360.0[m]DCRRI3367.0[m]DCRRI3375.0[m]DCRRI3386.0[m]SWCHYDRO3390.0[m]DCRRI3397.0[m]DCRRI3404.0[m]SWCHYDRO3412.0[m]DCRRI3420.0[m]DCRRI3425.0[m]DCRRI3435.0[m]DCRRI3445.0[m]DCRRI3450.0[m]DCRRI3460.0[m]DCRRI3470.0[m]DCRRI3480.0[m]SWCHYDRO3490.0[m]DCRRI3500.0[m]DCRRI3510.0[m]DCRRI3520.0[m]DCRRI3530.0[m]DCRRI3540.0[m]DCRRI3550.0[m]DCRRI3560.0[m]DCRRI3570.0[m]DCRRI3590.0[m]DCRRI3600.0[m]DCRRI3620.0[m]DCRRI3627.0[m]SWCHYDRO3640.0[m]DCRRI3650.0[m]DCRRI3660.0[m]DCRRI3670.0[m]DCRRI3680.0[m]DCRRI3690.0[m]DCRRI3700.0[m]DCRRI3710.0[m]DCRRI3720.0[m]DCRRI3730.0[m]DCRRI3736.0[m]CHYDRO3740.0[m]SWCHYDRO3750.0[m]DCRRI3759.0[m]DCRRI3770.0[m]DCRRI3780.0[m]DCRRI3790.0[m]DCRRI3800.0[m]DCRRI3810.0[m]DCRRI3820.0[m]DCRRI3830.0[m]DCRRI3840.0[m]DCRRI3850.0[m]DCRRI3858.0[m]SWCHYDRO3870.0[m]DCRRI3880.0[m]DCRRI3890.0[m]DCRRI3900.0[m]DCRRI3910.0[m]DCRRI3920.0[m]DCRRI3930.0[m]DCRRI3940.0[m]DCRRI3950.0[m]DCRRI3964.0[m]SWCHYDRO3970.0[m]DCRRI3983.0[m]SWCHYDRO3990.0[m]DCRRI3997.0[m]SWCHYDRO4007.0[m]SWCHYDRO4027.0[m]DCRRI