6506/12-1
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General information
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Wellbore history
GeneralWell 6506/12-1 was drilled on the Alpha structure in the northwest part of the block. The main objective was middle Jurassic sandstones in an anti form structure. The secondary and tertiary objectives were Early Jurassic and Triassic sandstones on the same structure. Late and Early Cretaceous were also considered possible zones of hydrocarbon accumulations. Further objectives, of a more general exploratory nature, included the sampling of potential source rocks. Total depth was to be in rocks of Triassic age, or 4000 m in order to satisfy the licence commitment.The well is Type Well for the Tofte, Lange, and Lyr Formation. It is Reference Well for the Cromer Knoll Group and for the Springar, Nise, and Kvitnos Formations.Operations and resultsWildcat well 6506/12-1 was spudded with the semi-submersible installation Ross Isle on 16 August 1985 and drilled to TD at 4924 m in the Early Jurassic sediments of the Åre Formation. Drilling down to, and cementing the 20" casing, went without problems. While testing the casing a leak was discovered. No influx or loss of fluid was observed. Setting a cement plug in the interval 540-590 m solved the problem. A leak-off test equal to 1.34 g/cm3 below the 20" casing shoe was considered to low, and a cement squeeze was performed, after which a formation integrity test gave 1.64 g/cm3 without leak off. A cement squeeze also had to be performed to obtain a satisfactory leak-off test below the 13 3/8" casing shoe. Pore pressures were considerably below prognosed down to this depth. While preparing to run the 9 5/8" casing a sealing ring was dislodged and had to be milled. Down to 4317 m maximum deviation was 3.7 ° and difference between measured and true vertical depth was not more than 1 m. The last part of the well was however more problematic in this respect. At 4925 m it was decided to stop the drilling as the angle had built up too much, and an RFT-tool was stuck in the hole. The well was then logged and plugged back for testing. The well was drilled with spud mud down to 348 m, with bentonite and seawater from 348 m to 948 m, with gypsum/CMC from 948 m to 2203 m, with gypsum/lignosulphonate from 2203 m to 3918 m, with gel/lignosulphonate from 3918 m to 4554 m, and with gel/lignosulphonate/lignite from 4554 m to TD.A 15 m thick sandstone/siltstone unit (Lysing Formation) was encountered at 3175 m. Logs indicated presence of hydrocarbons, but well site analyses of returns recorded no shows. The well penetrated 139 m Late Jurassic shales from 3835 m to 3974 m, including 22 m Spekk Formation in the upper part. Hydrocarbon bearing Middle Jurassic sandstones were encountered at 3974 m. No hydrocarbon/water contacts were recognised, neither on logs nor on cores. Moreover, the hydrocarbons seemed to be present both in Middle and Early Jurassic sandstones including sandstones within the top of the Åre Formation. The drill stem tests produced hydrocarbons down to a depth of 4373 m.A total of 319 m of core was recovered in 15 cores from the Middle to Early Jurassic reservoir sections.The well was permanently abandoned on 6 February 1985 as a gas and condensate discovery.TestingSeven different intervals in the reservoir were tested. DST 1 (4504-4509 m), DST 3 (4291-4304), and DST 6 (4095-4110) showed tight formation with no formation fluid produced to surface. DST 2 (4351-4373 m, Lower Tilje Formation) produced 691700 Sm3 gas and 516.9 Sm3 condensate pr day on a 25.4 mm choke. DST 4 (4251-4261 m, upper Tilje Formation) produced 603100 Sm3 gas and 620.2 Sm3 condensate pr day on a 23.8 mm choke. DST 5 (4203-4218 m, Tofte Formation) produced 583900 Sm3 gas and 376.6 Sm3 condensate pr day on a 25.4 mm choke. DST 7 (3993-4011 m, Garn Formation) produced 727400 Sm3 gas and 511 Sm3 condensate pr day on a 31.8 mm choke. The gas/oil ratio for the different tests varied from 973 to 1550 Sm3/Sm3 while the CO2 was between 4.5 to 5.6 % and the H2S content was between 6.5 to 8.0 ppm. -
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]350.004922.50 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom13975.03993.0[m ]23993.04018.4[m ]34018.54044.0[m ]44044.04070.8[m ]54071.04097.4[m ]64098.04124.8[m ]74125.04151.7[m ]84173.04190.9[m ]94191.04205.4[m ]104219.04229.5[m ]114231.04250.0[m ]124252.04274.5[m ]134276.04277.5[m ]144279.04290.4[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]272.7Cores 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 availableDSTDST24351.004374.0011.12.1984 - 00:00YESDSTDST2C4373.004351.0012.12.1984 - 00:00YESDSTDST34374.004351.0022.12.1984 - 20:50YESDSTDST44251.004261.0026.12.1984 - 00:00YESDSTDST4B4251.004261.0030.12.1984 - 10:03YESDST0.000.00YESDSTDST5B4203.004218.0008.01.1985 - 03:30YESDSTDST5D4203.004218.0014.01.1985 - 00:00YESDSTDST73993.004011.0027.01.1985 - 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 typeCONDUCTOR30346.036347.00.00LOTSURF.COND.20931.026951.00.00LOTINTERM.13 3/82184.017 1/22206.01.81LOTINTERM.9 5/83907.012 1/43918.01.92LOTLINER74553.08 1/24554.01.98LOTOPEN HOLE4925.064925.00.00LOT -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.04504450931.82.04351437325.43.0429143043.24.14251426125.45.04218420319.05.14218420319.06.0409541100.07.03993401131.8Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.067.00044.00071.0002.033.00012.00043.0003.047.0004.119.00047.0005.0104.0005.1104.0006.07.0Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.02.05176920000.7900.75013523.04.17005470000.8059285.03505500000.79015715.12734100000.79015006.07.05117280000.7900.7501424 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]BGL DUAL CALIPER346765BGL DUAL CALIPER346949CBL VDL CCL37514510CBL VDL GR7902181CBL VDL GR37544926CEL CLL GR37544521CST GR22003911CST GR39294540CST GR45574811DLL SP GR39094549DLL SP GR45544929ISF LSS MSFL SP GR3454926LDL CNL GR3454926MWD - GR RES DIR345945NGT PB35503910NGT PB39094510RFT GR39764098RFT GR39870RFT GR40774453RFT GR45734794RFT GR48674870SHDT GR35503921SHDT GR39094557VBL VDL GR24723906VSP2824830 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit27714591931193121322132222722792279244626583175317531903813383638363852397439744013404841074107416442294437 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf1.07 -
Geochemical information
Geochemical information Document nameDocument formatDocument size [MB]pdf2.38 -
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]pdf21.31pdf3.51 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured3461.10WATER BASED20.08.19849481.1610.020.0WATER BASED22.08.19849481.1610.020.0WATER BASED24.08.19849481.3211.021.0WATER BASED27.08.19849481.107.031.0WATER BASED22.08.19849481.1610.020.0WATER BASED22.08.19849481.1610.020.0WATER BASED24.08.19849481.3211.021.0WATER BASED27.08.198412741.136.09.0WATER BASED03.09.198417001.178.06.8WATER BASED03.09.198421101.3511.08.8WATER BASED04.09.198422031.3514.07.8WATER BASED06.09.198422031.4011.06.8WATER BASED06.09.198422031.5513.05.9WATER BASED06.09.198422031.6013.05.0WATER BASED10.09.198422031.4011.06.8WATER BASED06.09.198422031.6013.05.0WATER BASED10.09.198422031.5513.05.9WATER BASED06.09.198423001.6016.011.0WATER BASED11.09.198424851.6020.08.0WATER BASED11.09.198425371.6017.04.8WATER BASED11.09.198427181.6520.07.8WATER BASED12.09.198427631.6521.07.7WATER BASED13.09.198429151.6518.09.2WATER BASED17.09.198429831.6515.04.8WATER BASED17.09.198432381.6519.08.3WATER BASED19.09.198433301.6519.09.0WATER BASED20.09.198436541.6816.25.2WATER BASED23.09.198436541.7216.05.0WATER BASED27.09.198436541.7216.05.0WATER BASED27.09.198439171.7215.05.6WATER BASED15.10.198439731.2512.04.5WATER BASED15.10.198440381.2519.04.7WATER BASED15.10.198441251.2515.0WATER BASED19.10.198443071.2513.05.4WATER BASED29.10.198444931.2512.05.7WATER BASED30.10.198445541.2817.05.7WATER BASED30.10.198446821.3616.03.9WATER BASED15.11.198447571.0416.03.8WATER BASED16.11.198448331.4520.06.0WATER BASED19.11.198449241.5320.04.3WATER BASED19.11.198449241.5821.04.0WATER BASED23.11.198449241.6322.06.0WATER BASED23.11.198449241.6823.06.7WATER BASED26.11.198449241.5821.04.8WATER BASED20.11.198449241.5821.04.8WATER BASED20.11.198449241.5821.04.0WATER BASED23.11.198449241.6322.06.0WATER BASED23.11.198449241.6823.06.7WATER BASED26.11.1984 -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory1920.0[m]DCSTL1950.0[m]DCSTL1980.0[m]DCSTL2000.0[m]DCSTL2010.0[m]DCSTL2030.0[m]DCSTL2060.0[m]DCSTL2070.0[m]DCSTL2090.0[m]DCSTL2100.0[m]DCSTL2120.0[m]DCSTL2130.0[m]DCSTL2150.0[m]DCSTL2160.0[m]DCSTL2180.0[m]DCSTL2190.0[m]DCSTL2210.0[m]DCSTL2220.0[m]DCSTL2240.0[m]DCSTL2242.0[m]SWCSTL2250.0[m]DCSTL2263.5[m]SWCSTL2270.0[m]DCSTL2270.0[m]DCRRI2280.0[m]DCSTL2280.0[m]DCRRI2300.0[m]DCRRI2300.0[m]DCOD2300.0[m]DCSTL2310.0[m]DCSTL2320.0[m]DCOD2320.0[m]DCRRI2330.0[m]DCSTL2337.0[m]SWCSTL2340.0[m]DCRRI2340.0[m]DCSTL2340.0[m]DCOD2360.0[m]DCOD2360.0[m]DCSTL2360.0[m]DCRRI2370.0[m]DCSTL2380.0[m]DCOD2380.0[m]DCRRI2390.0[m]DCSTL2400.0[m]DCSTL2400.0[m]DCOD2400.0[m]DCRRI2415.0[m]SWCSTL2420.0[m]DCSTL2420.0[m]DCOD2420.0[m]DCRRI2430.0[m]DCSTL2440.0[m]DCOD2440.0[m]DCSTL2440.0[m]DCRRI2450.0[m]DCSTL2455.0[m]DCRRI2460.0[m]DCOD2465.0[m]DCSTL2470.0[m]DCRRI2480.0[m]DCOD2480.0[m]DCSTL2495.0[m]DCSTL2495.0[m]DCRRI2500.0[m]DCOD2510.0[m]DCSTL2510.0[m]DCRRI2520.0[m]DCOD2525.0[m]DCRRI2540.0[m]DCOD2540.0[m]DCRRI2555.0[m]DCSTL2555.0[m]DCRRI2560.0[m]DCOD2570.0[m]DCSTL2570.0[m]DCRRI2582.0[m]SWCSTL2585.0[m]DCSTL2587.5[m]DCOD2590.0[m]DCRRI2600.0[m]DCSTL2600.0[m]DCOD2600.0[m]DCRRI2615.0[m]DCSTL2620.0[m]DCOD2630.0[m]DCSTL2630.0[m]DCRRI2640.0[m]DCOD2645.0[m]DCSTL2645.0[m]DCRRI2660.0[m]DCSTL2660.0[m]DCOD2675.0[m]DCSTL2675.0[m]DCRRI2680.0[m]DCOD2690.0[m]DCSTL2700.0[m]DCOD2705.0[m]DCSTL2720.0[m]DCSTL2720.0[m]DCOD2735.0[m]DCSTL2740.0[m]DCOD2750.0[m]DCSTL2750.0[m]DCRRI2760.0[m]DCOD2765.0[m]DCSTL2765.0[m]DCRRI2767.0[m]SWCSTL2780.0[m]DCSTL2780.0[m]DCOD2780.0[m]DCRRI2795.0[m]DCSTL2795.0[m]DCRRI2800.0[m]DCOD2805.0[m]DCOD2805.0[m]DCRRI2810.0[m]DCSTL2815.0[m]DCRRI2825.0[m]DCSTL2840.0[m]DCSTL2840.0[m]DCRRI2855.0[m]DCSTL2870.0[m]DCSTL2885.0[m]DCSTL2885.0[m]DCRRI2900.0[m]DCSTL2915.0[m]DCSTL2915.0[m]DCRRI2930.0[m]DCSTL2945.0[m]DCSTL2945.0[m]DCRRI2960.0[m]DCSTL2960.0[m]DCOD2975.0[m]DCSTL2975.0[m]DCRRI2980.0[m]DCOD2990.0[m]DCSTL3000.0[m]DCOD3002.0[m]SWCSTL3005.0[m]DCSTL3020.0[m]DCSTL3020.0[m]DCOD3035.0[m]DCSTL3035.0[m]DCRRI3040.0[m]DCOD3050.0[m]DCSTL3060.0[m]DCOD3065.0[m]DCSTL3080.0[m]DCSTL3080.0[m]DCOD3080.0[m]DCRRI3095.0[m]DCSTL3095.0[m]DCRRI3100.0[m]DCOD3110.0[m]DCSTL3120.0[m]DCOD3125.0[m]DCSTL3125.0[m]DCRRI3140.0[m]DCSTL3140.0[m]DCOD3140.0[m]DCRRI3155.0[m]DCSTL3155.5[m]DCRRI3160.0[m]DCOD3170.0[m]DCSTL3170.0[m]DCRRI3179.5[m]SWCSTL3180.0[m]DCOD3185.0[m]DCSTL3185.0[m]DCRRI3200.0[m]DCOD3200.0[m]DCSTL3200.0[m]DCRRI3215.0[m]DCSTL3215.0[m]DCRRI3220.0[m]DCOD3230.0[m]DCSTL3230.0[m]DCRRI3240.0[m]DCOD3245.0[m]DCSTL3245.0[m]DCRRI3255.5[m]SWCSTL3260.0[m]DCOD3260.0[m]DCSTL3260.0[m]DCRRI3275.0[m]DCSTL3275.0[m]DCRRI3280.0[m]DCOD3290.0[m]DCSTL3290.0[m]DCRRI3300.0[m]DCOD3305.0[m]DCSTL3305.0[m]DCRRI3320.0[m]DCOD3320.0[m]DCSTL3320.0[m]DCRRI3335.0[m]DCSTL3335.0[m]DCRRI3340.0[m]DCOD3350.0[m]DCSTL3350.0[m]DCRRI3360.0[m]DCOD3365.0[m]DCRRI3380.0[m]DCOD3380.0[m]DCSTL3380.0[m]DCRRI3395.0[m]DCSTL3395.0[m]DCRRI3400.0[m]DCOD3410.0[m]DCSTRAT3410.0[m]DCRRI3416.8[m]SWCSTRAT3420.0[m]DCOD3425.0[m]DCSTRAT3425.0[m]DCRRI3440.0[m]DCSTRAT3440.0[m]DCOD3440.0[m]DCRRI3455.0[m]DCSTRAT3455.0[m]DCRRI3460.0[m]DCOD3470.0[m]DCSTRAT3470.0[m]DCRRI3480.0[m]DCOD3485.0[m]DCSTRAT3485.0[m]DCRRI3500.0[m]DCSTRAT3500.0[m]DCOD3500.0[m]DCRRI3515.0[m]DCSTRAT3515.0[m]DCRRI3520.0[m]DCOD3530.0[m]DCSTRAT3530.0[m]DCRRI3540.0[m]DCOD3545.0[m]DCSTRAT3545.0[m]DCRRI3560.0[m]DCSTRAT3560.0[m]DCOD3560.0[m]DCRRI3575.0[m]DCSTRAT3575.0[m]DCRRI3580.0[m]DCOD3590.0[m]DCSTRAT3590.0[m]DCRRI3591.0[m]SWCSTRAT3600.0[m]DCOD3605.0[m]DCSTRAT3605.0[m]DCRRI3620.0[m]DCSTRAT3620.0[m]DCOD3620.0[m]DCRRI3635.0[m]DCSTRAT3635.0[m]DCRRI3640.0[m]DCOD3650.0[m]DCSTRAT3650.0[m]DCRRI3662.5[m]DCOD3665.0[m]DCSTRAT3665.0[m]DCRRI3680.0[m]DCOD3680.0[m]DCRRI3682.0[m]DCSTRAT3695.0[m]DCSTRAT3695.0[m]DCRRI3696.5[m]SWCSTRAT3700.0[m]DCOD3710.0[m]DCSTRAT3710.0[m]DCRRI3720.0[m]DCOD3724.0[m]SWCSTRAT3725.0[m]DCSTRAT3725.0[m]DCRRI3740.0[m]DCSTRAT3740.0[m]DCOD3740.0[m]DCRRI3755.0[m]DCSTRAT3755.0[m]DCRRI3760.0[m]DCOD3770.0[m]DCSTRAT3770.0[m]DCRRI3780.0[m]DCOD3785.0[m]DCSTRAT3785.0[m]DCRRI3795.0[m]DCSTRAT3800.0[m]DCOD3800.0[m]DCRRI3804.0[m]SWCSTRAT3810.0[m]DCSTRAT3815.0[m]DCRRI3820.0[m]DCOD3825.0[m]DCSTRAT3830.0[m]DCRRI3840.0[m]SWCSTRAT3840.0[m]DCSTRAT3840.0[m]DCOD3840.0[m]DCRRI3848.0[m]SWCSTRAT3850.0[m]DCRRI3851.0[m]SWCSTRAT3853.0[m]SWCSTRAT3853.3[m]SWCSTRAT3853.7[m]SWCSTRAT3858.5[m]SWCSTRAT3860.0[m]DCOD3862.5[m]DCSTRAT3867.0[m]SWCSTRAT3870.0[m]DCSTRAT3871.0[m]SWCSTRAT3883.0[m]SWCSTRAT3885.0[m]DCSTRAT3891.0[m]DCSTRAT3900.0[m]SWCSTRAT3915.0[m]DCSTRAT3925.0[m]SWCSTRAT3930.0[m]DCSTRAT3945.0[m]DCSTRAT3960.0[m]DCSTRAT3964.0[m]SWCSTRAT3975.6[m]CSTRAT3978.3[m]CSTRAT3984.0[m]CSTRAT3990.9[m]CSTRAT4002.6[m]CSTRAT4011.1[m]CSTRAT4013.6[m]CSTRAT4017.8[m]CSTRAT4019.6[m]CSTRAT4023.6[m]CSTRAT4026.0[m]CSTRAT4028.3[m]CSTRAT4032.6[m]CSTRAT4038.5[m]CSTRAT4042.6[m]CSTRAT4044.2[m]CSTRAT4050.5[m]CSTRAT4052.4[m]CSTRAT4058.4[m]CSTRAT4060.5[m]CSTRAT4063.7[m]CSTRAT4070.4[m]CSTRAT4074.8[m]CSTRAT4075.6[m]CSTRAT4080.3[m]CSTRAT4084.8[m]CSTRAT4090.3[m]CSTRAT4095.4[m]CSTRAT4096.2[m]CSTRAT4101.5[m]CSTRAT4109.4[m]CSTRAT4113.6[m]CSTRAT4118.6[m]CSTRAT4128.4[m]CSTRAT4134.8[m]CSTRAT4140.5[m]CSTRAT4147.9[m]CSTRAT4151.7[m]CSTRAT4155.0[m]SWCSTRAT4177.5[m]CSTRAT4189.8[m]CSTRAT4199.8[m]CSTRAT4223.7[m]CSTRAT4226.9[m]CSTRAT4232.3[m]CSTRAT4238.5[m]CSTRAT4242.9[m]CSTRAT4246.8[m]CSTRAT4249.8[m]CSTRAT4258.7[m]CSTRAT4263.0[m]CSTRAT4267.9[m]CSTRAT4273.4[m]CSTRAT4282.0[m]CSTRAT4285.7[m]CSTRAT4287.3[m]CSTRAT4305.0[m]DCSTRAT4320.0[m]DCSTRAT4335.0[m]DCSTRAT4350.0[m]DCSTRAT4351.0[m]SWCSTRAT4367.0[m]SWCSTRAT4372.5[m]DCSTRAT4380.0[m]DCSTRAT4392.6[m]SWCSTRAT4395.0[m]DCSTRAT4410.0[m]DCSTRAT4420.0[m]SWCSTRAT4425.0[m]DCSTRAT4440.0[m]DCSTRAT4455.0[m]DCSTRAT4470.0[m]DCSTRAT4470.0[m]SWCSTRAT4482.5[m]SWCSTRAT4485.0[m]DCSTRAT4487.0[m]SWCSTRAT4500.0[m]DCSTRAT4509.0[m]SWCSTRAT4515.0[m]DCSTRAT4526.0[m]SWCSTRAT4530.0[m]DCSTRAT4545.0[m]DCSTRAT4557.0[m]SWCSTRAT4560.0[m]DCSTRAT4575.0[m]DCSTRAT4576.0[m]SWCSTRAT4600.0[m]DCSTRAT4602.0[m]SWCSTRAT4610.9[m]SWCSTRAT4611.0[m]SWCSTRAT4615.0[m]DCSTRAT4630.0[m]DCSTRAT4641.0[m]SWCSTRAT4645.0[m]DCSTRAT4660.0[m]DCSTRAT4675.0[m]DCSTRAT4690.0[m]DCSTRAT4705.0[m]DCSTRAT4716.0[m]SWCSTRAT4720.0[m]DCSTRAT4735.0[m]DCSTRAT4750.0[m]DCSTRAT4765.0[m]DCSTRAT4769.9[m]SWCSTRAT4780.0[m]DCSTRAT4795.0[m]DCSTRAT4810.0[m]DCSTRAT4811.4[m]SWCSTRAT4811.5[m]SWCSTRAT4825.0[m]DCSTRAT4840.0[m]DCSTRAT4855.0[m]DCSTRAT4870.0[m]DCSTRAT4885.0[m]DCSTRAT4900.0[m]DCSTRAT4915.0[m]DCSTRAT4922.0[m]DCSTRAT