7121/4-2
Export: PDF
-
General information
-
Wellbore history
GeneralWildcat well 7121/4-2 was drilled on a structure separate from and North of the Snøhvit Field in the Hammerfest Basin. The main objective was to test possible hydrocarbon accumulations in Middle to Early Jurassic sandstones. Prognosed TD was at 2800 m in rocks of Triassic age.Operations and resultsWildcat well 7121/4-2 was spudded with the semi-submersible installation West Vanguard on and drilled to TD at 2800 m in the Late Triassic Fruholmen Formation. Drilling proceeded without significant problems to 2460 m, in the middle of an Oxfordian shale, where cavings caused some tight spot problems while setting casing. Rough weather caused some delay in the drilling schedule. The well was drilled with bentonite spud mud down to 417 m, with pre-hydrated bentonite from 417 m to 900 m, with gypsum/ lignosulphonate from 900 m to 2455 m, and with lignosulphonate from 2455 m to TD.Reservoir top, Stø Formation, was encountered at 2480 m. RFT tests, samples and log responses indicated gas down to a gas/water contact at 2517 m. The gas zone consists of an interbedded sandstone/shale sequence with fair/poor reservoir properties. Fluorescence and cut was recorded throughout the cored section, which included the reservoir section. In addition oil stain was seen on a core from 2541.5 m to 2551 m. There was also a small gas zone at 2701.5 m to 2705 m in the Tubåen Formation. Chromatographic analysis showed a significantly drier gas here than in the main reservoir. Triassic, Rhaetian age sandstone was encountered from 2737 m to TD. Basement was not seen. Seven cores were cut in from 2463 m in the Fuglen Formation to 2597.5 m in the Nordmela Formation. The recovery was 134.3 m. Segregated RFT samples were taken at 2485.5 m (gas/mud filtrate and water/trace condensate), 2516 m (gas/mud filtrate/water), 2526 m (mud filtrate/water/trace gas), and at 2701.7 m (gas with small amount of mud filtrate and water).The well was permanently abandoned as a gas and condensate discovery on 14 April 1985TestingOne drill stem test was performed. The interval 2484 m to 2493 m was perforated and production tested. During the main flow period the test flowed 866900 Sm3 gas and 77.5 Sm3 condensate pr day through a 24.5 mm choke. This gives a GOR of 11186 Sm3/Sm3. Condensate density was 0.769 g/cm3. The CO2 and H2S contents in the gas were measured to 3.0 % and 1.7 ppm, respectively. -
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]420.002799.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12463.02481.2[m ]22481.02499.0[m ]32499.02527.0[m ]42527.02548.6[m ]52549.02555.5[m ]62555.52583.5[m ]72583.52597.5[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]134.3Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
-
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 typeCONDUCTOR30414.036417.00.00LOTSURF.COND.20900.026918.01.39LOTINTERM.13 3/81759.017 1/21774.01.49LOTINTERM.9 5/82455.012 1/42460.01.86LOTLINER72797.08 1/22800.00.00LOT -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.02484249316.0Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.065Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.0205270000.7690.64727300 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL VDL GR3371760CBL VDL GR15002455CBL VDL GR22682748CST9211761CST17942452CST26732799DLL GR SP24572668ISF BHC GR8992457ISF BHC MSFL GR339916ISF BHC MSFL GR24572801LDL CNL NGT24572802LDL GR4142458RFT GR24802664RFT GR26732781SHDT GR8992803VELOCITY6002760 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit3394204201068106811121112188522262338245024802480255726422737 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.42 -
Geochemical information
Geochemical information Document nameDocument formatDocument size [MB]pdf3.68 -
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]pdf39.83 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured9181.171000.0WATER BASED11401.121100.0WATER BASED12611.141300.0WATER BASED14581.16800.0WATER BASED16921.16800.0WATER BASED17691.121100.0WATER BASED17741.16900.0WATER BASED20091.121500.0WATER BASED22781.201300.0WATER BASED24601.371500.0WATER BASED25871.231200.0WATER BASED26291.231100.0WATER BASED26771.231100.0WATER BASED27251.231600.0WATER BASED28001.231400.0WATER BASED -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory500.0[m]DCGERH.510.0[m]DCGERH.520.0[m]DCGERH.530.0[m]DCGERH.540.0[m]DCGERH.550.0[m]DCGERH.560.0[m]DCGERH.570.0[m]DCGERH.580.0[m]DCGERH.600.0[m]DCGERH.610.0[m]DCGERH.620.0[m]DCGERH.630.0[m]DCGERH.640.0[m]DCGERH.650.0[m]DCGERH660.0[m]DCGERH.670.0[m]DCGERH.680.0[m]DCGERH.690.0[m]DCGERH.700.0[m]DCGERH.710.0[m]DCGERH.730.0[m]DCGERH.740.0[m]DCGERH.750.0[m]DCGERH.760.0[m]DCGERH.770.0[m]DCGERH.780.0[m]DCGERH.790.0[m]DCGERH.800.0[m]DCGERH.810.0[m]DCGERH820.0[m]DCGERH.830.0[m]DCGERH.840.0[m]DCGERH.850.0[m]DCGERH.860.0[m]DCGERH.870.0[m]DCGERH.880.0[m]DCGERH.890.0[m]DCGERH.900.0[m]DCGERH.918.0[m]DCGERH.921.7[m]SWCGERH.933.0[m]DCGERH.948.0[m]DCGERH.960.0[m]DCGERH.969.0[m]DCGERH.981.0[m]DCGERH.993.0[m]DCGERH.997.0[m]SWCGERH.1005.0[m]DCGERH.1017.0[m]DCGERH1029.0[m]DCGERH.1041.0[m]DCGERH.1053.0[m]DCGERH.1058.0[m]SWCGERH1065.0[m]DCGERH1077.0[m]DCGERH.1089.0[m]DCGERH.1101.0[m]DCGERH.1118.0[m]DCGERH.1119.0[m]SWCGERH.1125.0[m]DCGERH.1137.0[m]DCGERH.1152.0[m]DCGERH.1167.0[m]DCGERH.1182.0[m]DCGERH.1183.0[m]SWCGERH.1197.0[m]DCGERH1212.0[m]DCGERH.1220.0[m]SWCGERH.1227.0[m]DCGERH.1242.0[m]DCGERH.1257.0[m]DCGERH.1272.0[m]DCGERH.1282.0[m]SWCGERH.1287.0[m]DCGERH.1302.0[m]DCGERH.1314.0[m]DCGERH.1329.0[m]DCGERH.1344.0[m]DCGERH.1345.0[m]SWCGERH.1373.0[m]SWCGERH.1374.0[m]DCGERH.1389.0[m]DCGERH.1404.0[m]DCGERH.1420.0[m]DCGERH.1435.0[m]DCGERH.1450.0[m]DCGERH.1465.0[m]DCGERH.1480.0[m]DCGERH.1494.0[m]DCGERH.1509.0[m]DCGERH.1510.0[m]SWCGERH.1524.0[m]DCGERH.1539.0[m]DCGERH.1554.0[m]DCGERH.1554.0[m]SWCGERH.1569.0[m]DCGERH.1584.0[m]DCGERH.1599.0[m]DCGERH.1600.0[m]SWCGERH.1614.0[m]DCGERH.1629.0[m]DCGERH.1644.0[m]DCGERH.1659.0[m]DCGERH.1660.0[m]SWCGERH.1674.0[m]DCGERH.1696.7[m]DCGERH.1704.0[m]DCGERH.1719.0[m]DCGERH.1734.0[m]DCGERH.1749.0[m]DCGERH.1749.0[m]SWCGERH.1761.0[m]DCGERH.1764.0[m]DCGERH.1773.0[m]DCGERH.1779.0[m]DCGERH.1794.0[m]DCGERH.1794.4[m]SWCGERH.1809.0[m]DCGERH.1824.0[m]DCGERH.1829.4[m]DCGERH.1839.0[m]DCGERH.1854.0[m]DCGERH.1869.0[m]DCGERH.1874.4[m]SWCGERH.1879.4[m]SWCGERH.1883.9[m]SWCGERH.1899.0[m]DCGERH.1914.0[m]DCGERH.1929.0[m]DCGERH.1944.0[m]DCGERH.1951.4[m]SWCGERH.1959.0[m]DCGERH.1974.0[m]DCGERH.1989.0[m]DCGERH.2004.0[m]DCGERH.2019.0[m]DCGERH.2034.0[m]DCGERH.2049.0[m]DCGERH.2064.0[m]DCGERH.2079.0[m]DCGERH.2094.0[m]DCGERH.2109.0[m]DCGERH.2124.0[m]DCGERH.2134.4[m]SWCGERH.2139.0[m]DCGERH.2154.0[m]DCGERH2169.4[m]SWCGERH.2184.0[m]DCGERH.2199.0[m]DCGERH.2228.4[m]SWCGERH.2274.0[m]DCGERH.2289.0[m]DCGERH.2319.0[m]DCGERH.2332.4[m]SWCGERH.2349.0[m]DCGERH.2364.0[m]DCGERH.2374.4[m]SWCGERH.2379.0[m]DCGERH.2394.0[m]DCGERH.2409.0[m]DCGERH.2413.1[m]SWCGERH.2424.0[m]DCGERH.2439.0[m]DCGERH.2445.0[m]DCGERH.2452.4[m]SWCGERH.2460.0[m]DCGERH.2463.0[m]CGERH.2471.1[m]CGERH.2477.3[m]CGERH.2481.0[m]CGERH.2481.0[m]CGERH.2488.9[m]CGERH.2504.2[m]CGERH.2505.0[m]DCGERH.2512.0[m]CGERH.2523.7[m]CGERH.2535.0[m]DCGERH.2543.0[m]CGERH.2550.0[m]DCGERH.2560.4[m]CGERH.2565.0[m]DCGERH.2567.1[m]CGERH.2576.8[m]CGERH.2584.6[m]CGERH.2591.1[m]CGERH.2594.5[m]CGERH.2601.0[m]DCGERH.2607.3[m]SWCGERH.2625.0[m]DCGERH.2634.0[m]DCGERH.2643.0[m]DCGERH2668.5[m]SWCGERH.2685.0[m]DCGERH.2714.0[m]SWCGERH.2744.0[m]SWCGERH.2775.0[m]DCGERH.2790.0[m]DCGERH.2792.0[m]SWCGERH.2800.0[m]DCGEAR