25/8-5 S
Export: PDF
-
General information
-
Wellbore history
GeneralThe main objective of Well 25/8-5 S was to test the presence of hydrocarbons in both the lower Jurassic Statfjord Formation and in the Paleocene Heimdal Formation in the Elli Prospect. The well was to be drilled as a directional well in order to penetrate the two objectives.Operations and resultsExploration well 25/8-5 S was spudded with the semi-submersible installation "Dyvi Stena" on 21 July 1994 and was drilled as a deviated well to a total depth of 3395 m (3040.7 m TVD RKB / 2887.7 m TVD SS), 57 m into late Triassic (Rhaetian) sediments of the Smith Bank Formation. The well was drilled vertical down to 1204 m before starting to build angle. It was drilled with seawater and hi-vis pills down to 1215 m and with KCl / polymer / PAC / Glycol from 1215 m to TD.Top Heimdal Formation was penetrated at 2112.6 m (2050 m TVD SS) at an inclination of 33 degrees and an azimuth of 171 degrees and was found to contain oil. The oil-water contact was estimated at 2158 m (2087 m TVD SS). The well found sands of the Vestland Group at 2836 m (2570 m TVD SS) water-wet and the second objective, Statfjord Formation at 3040 m (2687.3 m TVD SS) water-wet. The inclination at top Statfjord was 53.6 degrees and azimuth 163.5 degrees. Top Triassic was correlated to be at 3338 (2855.3 m TVD SS). The inclination was 55.2 degrees and azimuth 163.3 degrees at TD. The well was logged with LWD from 270 m to TD. The LWD included GR-Dual Resistivity and Compensated Density/Neutron. Wire line logs were run from 1170 m - 2291 m. Due to difficult hole conditions, it was not possible to run wire line logs below 2423 m. One core was cut in the Heimdal Formation from 2136 m to 2150 m and one core was cut in the Statfjord Formation from 3052 m to 3061 m. A FMT fluid sample was taken at 2133.6 (2067 m TVD SS) m in the Heimdal Formation. The well was suspended on 22 September as an oil discovery (Jotun). It was re-entered (25/8-5 S R) on 27 July 1997 for plugging and permanent abandonment. Permanent abandonment was completed on 3 August 1997.TestingThe well was successfully tested in the Heimdal Formation, 2118 - 2149 m and flowed 1073 Sm3/day of 37° API oil through a 128/64 inch choke. The GOR was 38 Sm3/Sm3. No sand or water was produced. -
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]1180.003395.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12136.42150.6[m ]23052.03061.2[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]23.4Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
-
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 availableDSTDST12149.002118.0015.09.1994 - 07:45YES -
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 typeCONDUCTOR30272.036272.00.00LOTSURF.COND.13 3/81153.017 1/21170.00.00LOTINTERM.9 5/82291.012 1/42302.00.00LOTOPEN HOLE3395.08 1/23395.00.00LOT -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.02118214950.0Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.029.00082Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.01073407740.85038 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]BRIDGE PLUG22302230CCL19002233DAL GR CAL CHT21352423DAL GR CMT.TOP14702285DLL MLL TBRT CHT GR01153FMT21132208FMT21172201FMT21712171HEXDIP11532204LWD CDN - DEN DEU22683373LWD CDR - DRES11703387MWD - GR DIR2743395SWC20082251VSP - MLR5002290ZDL CN SL MAC CHT11532301ZDL CN SL MAC CHT11532260 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit1514486086546541000124713031950195020082068211324202529260026002780278027952795282228362836287829222922304033383338 -
Geochemical information
Geochemical information Document nameDocument formatDocument size [MB]pdf1.47 -
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]pdf35.79 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured1801.02DUMMY3521.13DUMMY8111.13DUMMY11371.5016.0DUMMY11701.2028.0WATER BASED13311.2332.0WATER BASED17551.3748.0WATER BASED20081.5042.0WATER BASED20641.5018.0DUMMY20941.5039.0WATER BASED21081.5016.0DUMMY21361.5038.0WATER BASED21501.5033.0WATER BASED22341.5034.0WATER BASED22611.5034.0WATER BASED23001.5031.0WATER BASED23011.5032.0WATER BASED23351.2219.0WATER BASED24851.2225.0WATER BASED26151.2322.0WATER BASED27001.2330.0WATER BASED27121.2228.0WATER BASED27581.2130.0WATER BASED28791.2631.0WATER BASED30151.3029.0WATER BASED30151.2627.0WATER BASED30611.3325.0WATER BASED33951.4028.0WATER BASED -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory1250.0[m]DCSTRAT1800.0[m]DCSTRAT1840.0[m]DCSTRAT1880.0[m]DCSTRAT1900.0[m]DCSTRAT1921.0[m]DCSTRAT1942.0[m]DCSTRAT1954.0[m]DCSTRAT1963.0[m]DCSTRAT1984.0[m]DCSTRAT1999.0[m]DCSTRAT2023.0[m]DCSTRAT2041.0[m]DCSTRAT2050.0[m]DCSTRAT2062.0[m]DCSTRAT2089.0[m]DCSTRAT2104.0[m]DCSTRAT2128.0[m]SWCSTRAT2134.0[m]DCSTRAT2144.5[m]CSTRAT2145.2[m]CSTRAT2150.5[m]CSTRAT2158.0[m]SWCSTRAT2161.0[m]DCSTRAT2167.5[m]SWCSTRAT2183.0[m]DCSTRAT2185.0[m]DCSTRAT2224.0[m]DCSTRAT2247.5[m]SWCSTRAT2251.0[m]SWCSTRAT2260.0[m]DCSTRAT2299.0[m]DCSTRAT2305.0[m]DCSTRAT2314.0[m]DCSTRAT2323.0[m]DCSTRAT2350.0[m]DCSTRAT2371.0[m]DCSTRAT2389.0[m]DCSTRAT2392.0[m]DCSTRAT2398.0[m]DCSTRAT2407.0[m]DCSTRAT2428.0[m]DCSTRAT2449.0[m]DCSTRAT2485.0[m]DCSTRAT2527.0[m]DCSTRAT2554.0[m]DCSTRAT2569.0[m]DCSTRAT2602.0[m]DCSTRAT2623.0[m]DCSTRAT2647.0[m]DCSTRAT2653.0[m]DCSTRAT2662.0[m]DCSTRAT2680.0[m]DCSTRAT2701.0[m]DCSTRAT2710.0[m]DCSTRAT2737.0[m]DCSTRAT2755.0[m]DCSTRAT2761.0[m]DCSTRAT2773.0[m]DCSTRAT2785.0[m]DCSTRAT2794.0[m]DCSTRAT2797.0[m]DCSTRAT2803.0[m]DCSTRAT2809.0[m]DCSTRAT2818.0[m]DCSTRAT2824.0[m]DCSTRAT2827.0[m]DCSTRAT2833.0[m]DCSTRAT2836.0[m]DCSTRAT2845.0[m]DCSTRAT2851.0[m]DCSTRAT2860.0[m]DCSTRAT2869.0[m]DCSTRAT2878.0[m]DCSTRAT2896.0[m]DCSTRAT2911.0[m]DCSTRAT2920.0[m]DCSTRAT2926.0[m]DCSTRAT2935.0[m]DCSTRAT2956.0[m]DCSTRAT2980.0[m]DCSTRAT2995.0[m]DCSTRAT3010.0[m]DCSTRAT3028.0[m]DCSTRAT3040.0[m]DCSTRAT3046.0[m]DCSTRAT3052.4[m]CSTRAT3055.4[m]CSTRAT3058.3[m]CSTRAT3059.4[m]CSTRAT3067.0[m]DCSTRAT3115.0[m]DCSTRAT3154.0[m]DCSTRAT3172.0[m]DCSTRAT3181.0[m]DCSTRAT3229.0[m]DCSTRAT3271.0[m]DCSTRAT3286.0[m]DCSTRAT3328.0[m]DCSTRAT3343.0[m]DCSTRAT3349.0[m]DCSTRAT3358.0[m]DCSTRAT3379.0[m]DCSTRAT3395.0[m]DCSTRAT -
Thin sections at the Norwegian Offshore Directorate
Thin sections at the Norwegian Offshore Directorate DepthUnit2137.00[m ]2136.40[m ]2137.25[m ]2137.55[m ]2137.75[m ]2138.00[m ]2138.25[m ]2138.50[m ]2138.75[m ]2139.00[m ]2139.25[m ]2139.55[m ]2139.75[m ]2140.00[m ]2140.25[m ]2140.55[m ]2140.75[m ]2141.00[m ]2141.25[m ]2141.50[m ]2141.75[m ]2142.00[m ]2142.25[m ]2142.50[m ]2142.75[m ]2143.00[m ]2143.55[m ]2143.75[m ]2144.00[m ]2144.25[m ]2144.75[m ]2145.00[m ]2145.25[m ]2145.55[m ]2145.75[m ]2146.00[m ]2146.25[m ]2146.55[m ]2146.75[m ]2147.00[m ]2147.25[m ]2147.80[m ]2148.00[m ]2148.25[m ]2148.50[m ]2148.75[m ]2149.00[m ]2149.25[m ]2149.50[m ]2149.80[m ]2150.00[m ]2150.25[m ]3052.00[m ]3052.60[m ]3053.00[m ]3053.75[m ]3054.25[m ]3054.75[m ]3055.25[m ]3055.75[m ]3056.25[m ]3056.80[m ]3057.75[m ]3057.25[m ]3058.25[m ]3058.75[m ]3059.55[m ]3059.25[m ]3060.50[m ]3061.00[m ]