6608/10-4
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General information
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Wellbore history
GeneralThe main objective of well 6608/10-4 was to prove oil accumulation in the Middle Jurassic Sandstones in the Norne Northeast segment.Operations and resultsWildcat well 6608/10-4 was spudded on 15 December 1993 with the semi-submersible installation "Ross Isle" and drilled to a total depth of 2800 m, in rocks of the Lower Jurassic Åre Formation. The well was drilled entirely water based with sea water and hi-vis pills to 818 m, and Gyp/PAC mud from 818 m to TD. Oil was encountered in the Middle Jurassic in the Melke Formation Sandstones and in the Garn Formation. One core was cut in the Cretaceous Nise Formation from 2091.0 m to 2095.5 m. Seven cores were cut in the interval from 2560.0 m in the Melke Formation to 2709 m in the Åre Formation. Core recovery varied between 92% and 100%. Segregated FMT samples were taken in the Melke, Garn, and Ile Formations. The Melke samples contained mainly mud filtrate with small amounts/traces of oil and gas, the Garn samples failed due to lost seal, while the Ile samples recovered only mud filtrate. The well was plugged and abandoned on 7 March 1994 as an oil and gas discovery.TestingThree drill stem tests were performed in the well. One test, DST 1, tested the Tofte Formation in the interval 2635 to 2640 m. The second test, DST 2, tested the Garn Formation in the interval 2566.2 to 2582.2 m. The Melke Formation was tested in two steps: DST 3A in the intervals 2484.5 - 2499 and 2504 - 2514 m, and DST 3B in the interval 2524 to 2531 in addition to intervals 3A. During DST 1 and DST 3A and 3B no formation fluid were produced to the surface. DST 3 proved that the Melke Formation was tight with oil in place. DST 2 produced a maximum of 900 Sm3/D of oil with a density of 858 kg/m3 at standard conditions and 75000 Sm3/D of gas with a relative density of 0.648 (air = 1.0) through an 80/64" (31.75 mm) choke. Minifrac tests were performed at the end of DST 1 and DST 2. The fracture closing pressures are evaluated to be: DST 1 405 bar and DST 2 410 bar. -
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]820.002800.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom22560.02586.2[m ]32587.02615.2[m ]42615.22641.9[m ]52642.02660.0[m ]62660.02673.0[m ]72673.02682.5[m ]82683.02707.1[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]145.6Cores 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 availableDSTDST22582.202466.20OIL16.02.1994 - 00:20YESDSTDST3AB2514.002484.5023.02.1994 - 20:00YES -
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 typeCONDUCTOR30464.036465.00.00LOTSURF.COND.20794.026796.01.50LOTINTERM.13 3/81401.017 1/21402.01.83LOTINTERM.9 5/82540.012 1/42542.01.83LOTLINER72800.08 1/22800.00.00LOT -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.0264026350.02.02582246631.73.1248525140.03.2252425310.0Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.02.040.000943.13.2Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.02.0900750000.8580.648833.13.2 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL VDL GR8002746DIFL MAC SL21752795DLL MLL GR24652650FMT GR24852662HRDIP GR13962555MWD4772558SWC GR14302774VSP5002750ZDL CNL GR24652794 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit405405140415611561184318431892192219222050218721872328232823722484253325672567259826052617261726572697 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.27 -
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]pdf44.34 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured4151.0320.0DUMMY4521.12WATER BASED7351.20DUMMY8961.1425.0WATER BASED14151.2523.0WATER BASED17771.5733.0WATER BASED19201.6031.0WATER BASED20631.5738.0WATER BASED20901.5730.0WATER BASED21031.6037.0WATER BASED22651.6028.0WATER BASED23291.6029.0WATER BASED24311.6027.0WATER BASED24861.6035.0WATER BASED25401.2525.0WATER BASED25581.6032.0WATER BASED25601.2017.0WATER BASED25871.2023.0WATER BASED26141.2022.0WATER BASED26401.2022.0WATER BASED26601.2022.0WATER BASED26831.2023.0WATER BASED27091.2023.0WATER BASED28001.2021.0WATER BASED -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory1922.0[m]SWCSTATO1940.0[m]DCGEOST1960.0[m]DCGEOST1972.0[m]SWCSTATO1980.0[m]SWCSTATO1999.0[m]DCGEOST2011.0[m]DCGEOST2025.0[m]SWCSTATO2045.0[m]SWCSTATO2062.0[m]DCGEOST2077.0[m]DCGEOST2110.0[m]DCGEOST2125.0[m]DCGEOST2140.0[m]DCGEOST2155.0[m]DCGEOST2170.0[m]DCGEOST2175.0[m]SWCSTATO2190.0[m]SWCSTATO2206.0[m]DCGEOST2222.0[m]SWCSTATO2239.0[m]DCGEOST2251.0[m]DCGEOST2267.0[m]SWCSTATO2281.0[m]DCGEOST2300.0[m]SWCSTATO2315.0[m]SWCSTATO2320.0[m]SWCSTATO2325.0[m]SWCSTATO2335.0[m]SWCSTATO2347.0[m]DCGEOST2355.0[m]SWCSTATO2360.0[m]SWCSTATO2371.0[m]DCGEOST2380.0[m]DCGEOST2395.0[m]DCGEOST2407.0[m]DCGEOST2416.0[m]DCGEOST2431.0[m]DCGEOST2443.0[m]DCGEOST2455.0[m]DCGEOST2464.0[m]DCGEOST2473.0[m]DCGEOST2480.0[m]SWCSTATO2490.0[m]SWCSTATO2495.0[m]SWCSTATO2500.0[m]SWCSTATO2507.0[m]SWCSTATO2520.0[m]SWCSTATO2525.0[m]SWCSTATO2530.0[m]DCGEOST2535.0[m]SWCSTATO2542.0[m]DCGEOST2545.0[m]DCGEOST2548.0[m]DCGEOST2554.0[m]DCGEOST2557.0[m]DCGEOST2560.3[m]CSTATO2563.8[m]CSTATO2565.9[m]CSTATO2569.0[m]CSTATO2571.3[m]CSTATO2573.7[m]CSTATO2576.5[m]CSTATO2580.5[m]CSTATO2586.2[m]CSTATO2590.9[m]CSTATO2592.4[m]CSTATO2596.8[m]CSTATO2599.8[m]CSTATO2603.8[m]CSTATO2604.7[m]CSTATO2605.7[m]CSTATO2608.3[m]CSTATO2609.3[m]CSTATO2609.7[m]CSTATO2611.7[m]CSTATO2612.4[m]CSTATO2614.5[m]CSTATO2614.7[m]CSTATO2615.2[m]CSTATO2615.4[m]CSTATO2618.6[m]CSTATO2622.0[m]CSTATO2627.5[m]CSTATO2631.6[m]CSTATO2635.6[m]CSTATO2640.8[m]CSTATO2643.3[m]CSTATO2647.3[m]CSTATO2651.3[m]CSTATO2653.6[m]CSTATO2660.6[m]CSTATO2667.6[m]CSTATO2670.8[m]CSTATO2671.2[m]CSTATO2672.0[m]CSTATO2672.4[m]CSTATO2673.9[m]CSTATO2680.9[m]CSTATO2687.4[m]CSTATO2692.7[m]CSTATO2696.4[m]CSTATO2702.7[m]CSTATO2706.8[m]CSTATO2715.0[m]SWCSTATO2719.0[m]DCGEOST2722.0[m]DCGEOST2726.0[m]SWCSTATO2731.0[m]DCGEOST2737.0[m]DCGEOST2739.2[m]SWCSTATO2743.0[m]DCGEOST2746.0[m]DCGEOST2750.0[m]SWCSTATO2758.0[m]DCGEOST2762.0[m]SWCSTATO2764.0[m]DCGEOST2770.0[m]DCGEOST2774.0[m]SWCSTATO