6506/12-8
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General information
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Wellbore history
GeneralWell 6506/12-8 is located in the Haltenbanken area off shore Mid Norway. It was designed to appraise the Smørbukk South discovery in the southern part of the block. The main objective was to establish productivity in the Garn Formation down flank of well 6506/12-3, the fluid properties, and to provide better understanding of diagenesis effects. In the Ile Formation the gas/water contact should be established, and in the Tilje Formation the oil/water and gas/oil contacts should be established or confirmed.Operations and resultsAppraisal well 6506/12-8 was spudded with the semi-submersible installation West Delta on 4 June 1988 and drilled to TD at 4334 m in the Early Jurassic Tilje Formation. The well was drilled without significant problems or incidents. It was drilled with spud mud down to 558 m, with gypsum polymer mud from 558 m to 3877 m, and with gel/lignosulphonate/lignite from 3877 m to TD. Gas bearing shallow sands were penetrated at 571 to 573 m and at 881 to 885 m.Weak shows were recorded in sands in the Lysing Formation at 3158 - 3185 m. Top of the target reservoir (top Garn Formation) was encountered at 3875 m, the Ile Formation was encountered at 3992.5 m, and the Tilje Formation was encountered at 4186 m. The logs showed good reservoir properties, especially in the Garn Formation. The Garn and the Tilje Formations were tested and found hydrocarbon bearing. The Garn Formation was hydrocarbon bearing all through down to the tight sandstones/siltstones of the Not Formation. Weak shows were recorded also in the Ile Formation sandstone, and the logs indicated hydrocarbons down to top Ror Formation at 4065 m. However, no test was conducted in the Ile Formation. In the Tilje Formation geochemical analyses of the cores showed that the hydrocarbons were distributed in distinct zones within the reservoir. The most likely OWC was estimated at ca 4269 m, but no clear contact was found.Eight cores were cut in the well. One core was cut in a claystone interval from 2311 -2321 m in the Tertiary Tang Formation, but it was not recovered to the surface. The remaining seven cores recovered a total of 208.8 m core. Five cores were cut in the interval 3878 - 4038.5 m (Fangst Group), and two cores were cut in the interval 4235 - 4292 m in the Tilje Formation. RFT fluid samples were taken at 3921 m (Garn), 3925 m (Garn), 3948.3 m (Garn), and at 4264 m (Tilje). The well was suspended on 1 September 1988 as an oil and gas appraisal well.TestingTwo DST tests were performed.DST 1 tested the intervals 4205 - 4221 m and 4237 - 4277 m in the Tilje Formation. It produced 460 Sm3 oil, 115000 Sm3 gas and 8 - 10% water/d through a 28/64" choke. The GOR was 250 Sm3/Sm3, the oil density was 0.820 g/cm3, and the gas gravity was 0.820 (air = 1). The maximum bottom hole temperature was 148 deg C.DST 2 tested the intervals 3915 - 3923 m and 3934 - 3955 m in the Garn Formation. It produced 1420 Sm3 oil, 460000 Sm3 gas and no water/d through a 64/64" choke. The GOR was 324 Sm3/Sm3, the oil density was 0.830 g/cm3, and the gas gravity was 0.775 (air = 1). The maximum bottom hole temperature was 138 deg C. -
Cuttings at the Norwegian Offshore Directorate
Cuttings at the Norwegian Offshore Directorate Cuttings available for sampling?NOCuttings at the Norwegian Offshore Directorate Cutting sample, top depth [m]Cutting samples, bottom depth [m]560.004335.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom23878.03904.8[m ]33905.03941.2[m ]43941.03972.2[m ]53973.03995.8[m ]64003.04036.8[m ]74235.04258.6[m ]84258.64293.0[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]208.7Cores 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 availableDSTTEST14237.004277.0016.08.1988 - 05:00YESDSTTEST23915.003923.0025.08.1988 - 01:00YES -
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 typeCONDUCTOR30386.036386.00.00LOTSURF.COND.20553.026577.01.43LOTINTERM.13 3/81859.017 1/21876.01.83LOTINTERM.9 5/83858.012 1/43877.01.75LOTLINER74332.08 1/24335.00.00LOT -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.04237427722.21.24205422111.12.03915395512.7Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.01.22.0Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.011003000000.8100.8272731.24601150000.8200.8202502.06101800000.8290.756295 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL VDL GR3251858CBL VDL GR31003856CBL VDL GR36644285CDL CN GR CAL18583873CDL CN SPL38564332DIFL AC GR18583873DIFL AC GR 3CAL38564331DIFL AC GR CDL CAL5531872DIPLOG38564328FMT GR31793179FMT HP38564258MLL DLL GR38564332MLL DLL GR CAL30923240MWD - GR RES DIR3864335SPL41804275VELOCITY10004333 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit325325134219681968223522352298235323532545270231583158318537253743374337873875387539563993406540654186 -
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]pdf12.33 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured3901.04120.0WATER BASED06.06.19883901.03WATER BASED06.06.19885711.03WATER BASED08.06.19885711.208.02.0WATER BASED10.06.19885771.70WATER BASED07.06.19889811.2045.05.0WATER BASED13.06.198814061.3048.03.5WATER BASED13.06.198815791.3014.04.0WATER BASED13.06.198818731.3517.05.5WATER BASED15.06.198818731.3517.06.0WATER BASED14.06.198818731.7021.02.5WATER BASED20.06.198818761.7058.03.0WATER BASED20.06.198819411.708.014.5WATER BASED21.06.198823111.6028.03.0WATER BASED24.06.198823111.6028.03.0WATER BASED27.06.198825301.6523.011.0WATER BASED06.07.198825301.6335.08.0WATER BASED27.06.198825301.6324.08.0WATER BASED27.06.198825301.6326.010.0WATER BASED28.06.198825301.6528.09.0WATER BASED29.06.198831801.6524.09.0WATER BASED01.07.198833981.6523.09.5WATER BASED04.07.198833981.6522.010.5WATER BASED05.07.198836201.6519.010.5WATER BASED07.07.198836201.6524.09.0WATER BASED08.07.198836691.6526.09.5WATER BASED11.07.198837381.6525.010.0WATER BASED11.07.198838081.6525.07.5WATER BASED11.07.198838501.6527.09.0WATER BASED12.07.198838501.6523.08.0WATER BASED13.07.198838651.6524.08.5WATER BASED14.07.198838711.6725.06.5WATER BASED15.07.198838771.6727.07.5WATER BASED19.07.198838771.6723.05.5WATER BASED19.07.198838771.6722.05.5WATER BASED19.07.198838771.6721.05.0WATER BASED19.07.198838771.6721.06.5WATER BASED21.07.198838771.1533.04.5WATER BASED29.07.198838771.1533.04.5WATER BASED01.08.198838771.1533.05.0WATER BASED03.08.198838771.1517.02.5WATER BASED15.08.198838771.1513.03.5WATER BASED23.08.198838771.1530.011.5WATER BASED29.08.198838771.1532.04.5WATER BASED27.07.198838771.1534.06.0WATER BASED27.07.198838771.1537.05.0WATER BASED27.07.198838771.1532.03.5WATER BASED28.07.198838771.1538.04.0WATER BASED01.08.198838771.1532.04.0WATER BASED01.08.198838771.1540.04.0WATER BASED04.08.198838771.1535.04.0WATER BASED05.08.198838771.1533.03.0WATER BASED08.08.198838771.1535.015.5WATER BASED08.08.198838771.1535.010.0WATER BASED08.08.198838771.1550.012.5WATER BASED09.08.198838771.1523.02.0WATER BASED11.08.198838771.1517.02.5WATER BASED12.08.198838771.1511.0WATER BASED15.08.198838771.1511.04.0WATER BASED15.08.198838771.1515.03.5WATER BASED16.08.198838771.1518.52.5WATER BASED19.08.198838771.1616.03.0WATER BASED19.08.198838771.156.02.5WATER BASED22.08.198838771.1512.03.0WATER BASED24.08.198838771.1511.03.0WATER BASED25.08.198838771.1517.04.5WATER BASED26.08.198838771.1534.011.5WATER BASED29.08.198838771.1539.09.5WATER BASED29.08.198838770.00WATER BASED30.08.198838781.1512.02.5WATER BASED21.07.198839051.1515.02.5WATER BASED27.07.198839181.1526.02.5WATER BASED27.07.198839831.1527.04.0WATER BASED27.07.1988 -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory2000.0[m]DCRRI2020.0[m]DCRRI2040.0[m]DCRRI2060.0[m]DCRRI2080.0[m]DCRRI2100.0[m]DCRRI2120.0[m]DCRRI2140.0[m]DCRRI2160.0[m]DCRRI2180.0[m]DCRRI2200.0[m]DCRRI2218.0[m]DCRRI2236.0[m]DCRRI2254.0[m]DCRRI2272.0[m]DCRRI2299.0[m]DCRRI2311.0[m]DCRRI2326.0[m]DCRRI2344.0[m]DCRRI2362.0[m]DCRRI2380.0[m]DCRRI2398.0[m]DCRRI2416.0[m]DCRRI2434.0[m]DCRRI2452.0[m]DCRRI2497.0[m]DCRRI2515.0[m]DCRRI2533.0[m]DCRRI2551.0[m]DCRRI2569.0[m]DCRRI2587.0[m]DCRRI2605.0[m]DCRRI2623.0[m]DCRRI2641.0[m]DCRRI2659.0[m]DCRRI2677.0[m]DCRRI2695.0[m]DCRRI2704.0[m]DCRRI2718.0[m]DCRRI2722.0[m]DCRRI2740.0[m]DCRRI2755.0[m]DCRRI2773.0[m]DCRRI2788.0[m]DCRRI2803.0[m]DCRRI2818.0[m]DCRRI2833.0[m]DCRRI2848.0[m]DCRRI2863.0[m]DCRRI2878.0[m]DCRRI2893.0[m]DCRRI2908.0[m]DCRRI2923.0[m]DCRRI2938.0[m]DCRRI2953.0[m]DCRRI2968.0[m]DCRRI2983.0[m]DCRRI2998.0[m]DCRRI3013.0[m]DCRRI3028.0[m]DCRRI3043.0[m]DCRRI3058.0[m]DCRRI3073.0[m]DCRRI3088.0[m]DCRRI3103.0[m]DCRRI3118.0[m]DCRRI3133.0[m]DCRRI3148.0[m]DCRRI3163.0[m]DCRRI3178.0[m]DCRRI3193.0[m]DCRRI3208.0[m]DCRRI3223.0[m]DCRRI3238.0[m]DCRRI3253.0[m]DCRRI3268.0[m]DCRRI3283.0[m]DCRRI3298.0[m]DCRRI3313.0[m]DCRRI3328.0[m]DCRRI3340.0[m]DCRRI3358.0[m]DCRRI3373.0[m]DCRRI3388.0[m]DCRRI3403.0[m]DCRRI3418.0[m]DCRRI3433.0[m]DCRRI3448.0[m]DCRRI3463.0[m]DCRRI3478.0[m]DCRRI3493.0[m]DCRRI3508.0[m]DCRRI3523.0[m]DCRRI3538.0[m]DCRRI3553.0[m]DCRRI3568.0[m]DCRRI3583.0[m]DCRRI3598.0[m]DCRRI3613.0[m]DCRRI3628.0[m]DCRRI3643.0[m]DCRRI3658.0[m]DCRRI3673.0[m]DCRRI3688.0[m]DCRRI3703.0[m]DCRRI3733.0[m]DCRRI3748.0[m]DCRRI3763.0[m]DCRRI3778.0[m]DCRRI3793.0[m]DCRRI3808.0[m]DCRRI3823.0[m]DCRRI3838.0[m]DCRRI3853.0[m]DCRRI3868.0[m]DCRRI4045.0[m]DCRRI4075.0[m]DCRRI4090.0[m]DCRRI4105.0[m]DCRRI4120.0[m]DCRRI4135.0[m]DCRRI4150.0[m]DCRRI4165.0[m]DCRRI4180.0[m]DCRRI4195.0[m]DCRRI4210.0[m]DCRRI4225.0[m]DCRRI4242.5[m]CRRI4258.1[m]CRRI4266.5[m]CRRI4273.8[m]CRRI4303.0[m]DCRRI4333.0[m]DCRRI