7128/4-1
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General information
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Wellbore history
GeneralWell 7128/4-1 is located in the Finmark Øst area. The main objective for the well was to test the potential for hydrocarbons in Visean sandstone on the "Omd Vest" structure. The secondary objective was to test the hydrocarbon potential, reservoir and trap possibilities of the Asselian - Sakmarian carbonates and the upper Permian succession.OperationsExploration well 7128/4-1 was spudded with the semi-submersible installation "Ross Rig" on 17 December 1993 and drilled to TD at 2530 m in pre-Devonian basement rocks, 27 m below base of the Early Carboniferous Soldogg Formation. The well was drilled with seawater and bentonite / CMC EHV spud mud down to 770 m and with GYP/PAC mud from 770 m to TD.The well penetrated Quaternary, Tertiary, Triassic, Permian, and Carboniferous sediments. The Cretaceous and Jurassic sequences were not present. Gas chromatography readings during drilling and log evaluation indicated gas saturation in the primary target. The sandstone was very tight and therefore not production tested. However, the Late Permian spiculite was partly very porous and permeable with a gas cap over moveable oil. A GOC was indicated at 1575 m.A total of five conventional cores were cut in the well 1574 m t 1577 m (Late Permian Røye Formation), 1814 m to 1837 m (Isbjørn and Ørn Formations of Early Permian age), 1837 m to 1865 m (Early Permian Ørn Formation), 2362 m to 2389.47 m (Early Carboniferous Soldogg Formation), and 2526 m to 2530 m (Pre-Devonian basement).FMT wire line samples were obtained from three levels: 1572.7 m, 1576 m, and 1588.8 m. In the FMT samples taken at 1572.7 m, the 10-litre chamber contained 0.106 m3 of gas with an initial pressure of 8274 kPa. The 4-litre chamber contained 183 litre of gas, 0.5 ml of oil and 1380 ml of water/mud filtrate. Geco measured the density of the gas to 0.637 (air = l). For the samples taken at 1576 m the 10 litre chamber contained 2,5 litre of oil with a density of 0.81 g/cm3, 0.190 m3 of gas and the total liquid (mud filtrate + oil) volume was 9.3 litre. The 4 litre chamber contained 63.5 litre of gas, 225 ml of oil and the water volume was not possible to measure due to water leakage past the piston when the Geco transferred from FMT bottle to a PVT bottle. The gas gravity was measured to 0.790 (air = l). The oil density of stabilized oil was measured to 0.817 g/cm3 at 15 °C. One 10-litre sample taken at 1588.8 m contained 2.5 litre of mud filtrate. The sampling aborted after 4 hrs and 17 min. The well was permanently abandoned on 26 February 1994 as an oil and gas discovery.TestingTwo zones were perforated and tested: Test no. 1 from 1592 -1610 m, and test no. 2 from 1577 -1586 m. For test no. 1 both diesel and Nitrogen was used to increase the under-balance, but the well did not flow. Finally, after stimulation with HCl test no. 1 produced 320 000 Sm3/d gas, 17 m3/d oil, and 70 m3/d water on a 72 mm choke. The HCl stimulation may have affected the cement, and the producing interval was probably the porous spiculite at 1569 m to 1590 m. Test no. 2 produced 215 000 Sm3/d gas, 15 m3/d oil, and 85 m3/d water on a 25.4 mm choke.l> -
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]780.002529.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom11574.01576.3[m ]21814.01836.0[m ]31837.01865.7[m ]42362.02389.5[m ]52526.02528.5[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]82.9Cores 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 availableDSTDST1-1A1610.001595.0009.02.1994 - 00:00YESDSTDST1A-1B1610.001577.0010.02.1994 - 21:00YESDSTDST21577.000.0017.02.1994 - 14:15YES -
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 typeCONDUCTOR30455.036455.00.00LOTINTERM.20750.026750.01.40LOTINTERM.13 3/81502.017 1/21504.01.74LOTINTERM.9 5/82432.012 1/42432.01.50LOTOPEN HOLE2530.08 1/22530.00.00LOTOPEN HOLE2530.08 1/20.00.00LOT -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.01592161072.02.01577158625.4Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.02.030.000Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.017320000188232.0152150000.7970.63814333 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBIL GR15022469CBL VDL GR11001502DIFL ACL ZDL CNL GR15022023DIFL ACL ZDL GR7501517DIFL ACL ZDL GR24322530DIFL MAC SL GR15022471DLL MLL GR15401718FMT15701594FMT GR15731574FMT GR15761576FMT GR15851589FMT GR15942447FMT GR15942420FMT GR16581685MWD4602526SHDT GR15032463SWC GR7561515SWC GR15331691SWC GR16932072SWC GR20762467VSP GR4932460ZDL CNL GR19882469 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit394494494504504748100815691569170417041820182019522058205823512503 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.41 -
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]pdf51.84 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured7151.2015.0WATER BASED7701.1217.0WATER BASED8151.0317.0WATER BASED13071.2018.0WATER BASED14951.2015.0WATER BASED15251.2018.0WATER BASED15891.12WATER BASED17011.2019.0WATER BASED18141.2019.0WATER BASED19511.2021.0WATER BASED20921.2023.0WATER BASED21411.2026.0WATER BASED23561.2026.0WATER BASED24681.109.0WATER BASED25231.1017.0WATER BASED25301.12WATER BASED -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory892.0[m]SWCSTATO925.0[m]SWCSTATO981.0[m]SWCSTATO1055.0[m]SWCSTATO1281.0[m]SWCSTATO1323.5[m]SWCSTATO1339.0[m]SWCSTATO1399.0[m]SWCSTATO1514.5[m]SWCSTATO1538.0[m]SWCSTATO1543.0[m]SWCSTATO1555.0[m]SWCSTATO1561.0[m]SWCSTATO1566.0[m]SWCSTATO1568.5[m]SWCSTATO1668.0[m]SWCSTATO1682.5[m]SWCSTATO1693.0[m]SWCSTATO1701.5[m]SWCSTATO1814.7[m]CSTATO1819.6[m]CSTATO1824.9[m]CSTATO1828.2[m]CSTATO1851.5[m]CSTATO2009.0[m]SWCSTATO2015.3[m]SWCSTATO2057.0[m]SWCSTATO2058.0[m]DCUIB2061.0[m]DCUIB2073.0[m]DCUIB2082.0[m]DCUIB2091.0[m]SWCSTATOIL2094.0[m]DCUIB2097.0[m]DCUIB2103.0[m]SWCSTATOIL2106.0[m]DCUIB2115.0[m]DCUIB2124.0[m]DCUIB2130.8[m]SWCSTATOIL2133.0[m]DCUIB2145.0[m]DCUIB2160.0[m]DCUIB2169.0[m]DCUIB2170.0[m]SWCSTATOIL2181.0[m]DCUIB2182.0[m]SWCSTATOIL2205.0[m]DCUIB2211.0[m]SWCSTATOIL2214.0[m]DCUIB2220.0[m]DCUIB2243.5[m]SWCSTATOIL2244.0[m]DCUIB2253.0[m]DCUIB2256.0[m]DCUIB2257.0[m]SWCSTATOIL2280.0[m]DCUIB2282.0[m]SWCSTATOIL2283.0[m]DCUIB2286.0[m]DCUIB2286.0[m]SWCSTATOIL2286.0[m]DCUIB2295.0[m]DCUIB2311.0[m]SWCSTATOIL2313.0[m]DCUIB2328.0[m]DCUIB2331.5[m]SWCSTATOIL2331.5[m]SWCSTATOI2337.0[m]DCUIB2342.0[m]SWCSTATOIL2343.0[m]DCUIB2343.0[m]DCUIB2349.0[m]DCUIB2349.0[m]DCUIB2358.0[m]DCUIB2358.0[m]DCUIB2363.7[m]SWCSTATOIL2364.0[m]DCUIB2366.2[m]CUIB2366.6[m]CUIB2367.2[m]CUIB2368.7[m]CUIB2368.9[m]CSTATOIL2375.3[m]CSTATOI2376.0[m]CUIB2376.4[m]CUIB2376.6[m]CUIB2379.0[m]DCUIB2381.6[m]CSTATOIL2384.5[m]CUIB2384.7[m]CUIB2385.6[m]CUIB2385.8[m]CUIB2386.1[m]CUIB2386.5[m]CUIB2389.2[m]CUIB2389.5[m]CSTATOIL2391.0[m]DCUIB2394.0[m]DCUIB2396.0[m]SWCSTATOIL2448.0[m]DCUIB2450.0[m]SWCSTATOIL2472.0[m]DCUIB2527.4[m]DCUIB -
Thin sections at the Norwegian Offshore Directorate
Thin sections at the Norwegian Offshore Directorate DepthUnit1574.15[m ]1574.40[m ]1575.92[m ]1576.20[m ]1574.30[m ]1575.85[m ]1815.12[m ]1821.40[m ]1849.50[m ]1832.40[m ]1837.80[m ]1841.68[m ]1843.90[m ]1851.85[m ]1855.50[m ]1858.50[m ]1861.55[m ]1865.47[m ]2362.23[m ]2368.50[m ]2382.75[m ]2388.56[m ]2527.98[m ]