15/9-10
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General information
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Wellbore history
GeneralWildcat well is located between the Sleipner Vest and Sleipner Øst Fields. The well was designed to test possible hydrocarbon accumulations in the Upper Middle Jurassic sands and secondary test Heimdal Formation Sand of Paleocene age.Operations and resultsWildcat well 15/9-10 was spudded with the semi-submersible installation Neptuno Nordraug on 15 September 1981 and drilled to TD at 3289 m in the Triassic Smith Bank Formation. Drilling the 26" hole section complete loss of returns occurred at 186 m and a cement plug was set. Drilling out of the cement returns were again lost, at 178 m, requiring a further cement plug. Total losses due to this loss zone were well in excess of 10 000 bbls. After this operations went without significant problems. The well was drilled with seawater and hi-vis pills down to 172 m. The next section, the 26" section, was drilled down to 472 m with seawater/bentonite and quantities of Mica Fine, Nutplug, Kwikseal, and other additives. From 472 m to TD m the well was drilled with polymer/Drispac.The well encountered Tertiary sands in the Utsira Formation at 884 - 1102 m, Grid Formation at 2049 - 2079 m, Heimdal and Ty Formations at 2547 m to 2667 m. An RFT run in the Heimdal sand indicated a water gradient, 1.02 g/cm3. The primary target Jurassic sandstones was encountered at 3070 m in the Hugin and Sleipner Formations. Some shows were recorded in the Hugin Formation, but from the logs the formations were all water-wet. Possible source rocks were encountered in a comparatively thick and marly Blodøks Formation from 2871 m to 2924 m, and in the Late Jurassic Draupne and Heather Formations from 3004 m to 3070 m. Four conventional cores were cut. Core 1 was cut from 3061 m to 3062.4 m in the Heather Formation, core 2 was cut from 3082 m to 3100 m in the Hugin Formation, and cores 3 and 4 were cut from 3137 m to 3171 m in the Sleipner Formation. No fluid sample was taken.The well was permanently abandoned as dry with minor shows on 7 November 1981.TestingNo drill stem test was performed. -
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]180.003285.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom13061.03062.4[m ]23082.03101.0[m ]33137.03151.8[m ]43153.03171.0[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]53.2Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
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Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory2945.5[m]DC2980.0[m]DC3010.0[m]DC3024.0[m]SWC3040.0[m]DC3056.0[m]SWC3061.2[m]COD3061.3[m]C3061.9[m]C3070.0[m]DC3070.0[m]DCOD3075.0[m]DCOD3079.0[m]SWC3082.2[m]COD3082.3[m]C3083.0[m]C3084.0[m]C3084.2[m]COD3086.6[m]COD3089.4[m]C3090.6[m]COD3095.5[m]COD3095.5[m]C3099.2[m]COD3100.0[m]DC3110.0[m]DCOD3116.5[m]SWC3120.0[m]DCOD3130.0[m]DCOD3130.0[m]DC3140.2[m]COD3175.0[m]DC3200.0[m]DC3230.0[m]DC3260.0[m]DC3290.0[m]DC -
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 availableDST0.000.0027.09.1993 - 19:00YES -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit12388410831102119812602049207923002300233524102547259625972667266726712733287129242955295529822991300430043059307030703127318331833241 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.53 -
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]pdf16.17pdf1.86pdf0.11pdf3.58pdf0.15pdf3.89pdf0.29pdf2.43pdf0.18 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL VDL GR1191420CBL VDL GR2251166CBL VDL GR6982695CST23422675CYBERBOND2251166CYBERBOND6982695CYBERDIP27053290CYBERLOOK31303291FDC CNL GR27053290FDC GR4712718GEODIP31253250HDT27053290ISF BHC GR1723289RFT25012659VELOCITY5803280 -
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 typeCONDUCTOR30172.036173.00.00LOTSURF.COND.20472.026485.01.75LOTINTERM.13 3/81166.017 1/21178.01.65LOTINTERM.9 5/82706.012 1/42719.01.78LOTOPEN HOLE3289.08 1/23289.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured1971.0644.0spud mud4851.1044.06.0spud mud11781.1142.014.0water based25501.2249.020.0water based27191.2743.013.0water based29851.5053.012.0water based32891.4848.010.0water based -
Pressure plots
Pressure plots The pore pressure data is sourced from well logs if no other source is specified. In some wells where pore pressure logs do not exist, information from Drill stem tests and kicks have been used. The data has been reported to the NPD, and further processed and quality controlled by IHS Markit.Pressure plots Document nameDocument formatDocument size [MB]pdf0.21