2/11-7
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General information
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Wellbore history
GeneralWell 2/11-7 was designed to test a Jurassic reservoir half way between the crest and the mapped closing contour of a fault controlled structure up dip from the Danish well Gert-1 in the same structure. The primary objective was the middle Jurassic sands, expected to come in at 4696 m. Seismic anomalies at 320, 350, and 445 m respectively. Prognosed TD was 5025 m.Operations and resultsWildcat well 2/11-7 was spudded with Wi1h. Wi1helmsen semi-submersible installation Treasure Scout on 16 April 1986 and drilled to TD at 5042 m in Late Jurassic shales of the Haugesund Formation. The well was flow checked at 318 m and 445 m, without any indications of gas. The well was drilled with seawater and hi-vis pills down to 1016 m, with KCl mud from 1016 m to 3737 m, and with Lignosulfonate mud from 3737 m to TD. Due to high gas readings and subsequent problems with increased mud weight and lost circulation up to 14% oil was added to the mud at 3799 m. This mud was subsequently circulated out and displaced with new mud, but a level of 1% to 8% oil was recorded in the mud from 3799 m to TD. Due to high formation pressure and safety problems, drilling was terminated in Late Jurassic shales before having reached the target Middle Jurassic sand.Shows were reported from lowermost Chalk Group, limestones of the Cromer Knoll Group, and from Upper Jurassic Dolomite and sandstone stringers. No conventional cores were cut. Thirty sidewall cores were attempted from 3801,5 m to 3756 m whereof 10 were recovered. No fluid samples were taken. The well was permanently abandoned as a dry well with shows on 6 September 1986.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]1020.005042.00 -
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 typeCONDUCTOR30179.036179.00.00LOTSURF.COND.201001.0261016.01.88LOTINTERM.13 3/82695.017 1/22715.01.99LOTINTERM.9 5/83737.012 1/43811.02.18LOTLINER73960.08 1/23965.00.00LOTLINER55042.065042.00.00LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL VDL31393959CBL VDL33883735CBL VDL37934807CST GR27563965DIL LSS GR SP10012718DIL LSS GR SP39594658DIL MSFL LSS GR SP45785038DLL MSFL LSS GR SP26963734DLL MSFL LSS GR SP37353961LDL CNL GR CAL35003965LDL CNL GR CAL39594736LDL GR CAL10012718MWD1811010RFT37683957VSP7004945 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit95156029452945295930123056307530753132326535913620362036583773377338144720 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.72 -
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]pdf16.80 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured1041.03WATER BASED08.09.19861521.03WATER BASED04.09.19861521.03WATER BASED05.09.19861791.03WATER16.04.19864001.10WATER17.04.19869661.10WATER20.04.198610161.10WATER20.04.198610160.00WATER21.04.198610501.50WATER22.04.198613461.50WATER23.04.198615261.50WATER24.04.198617531.5531.014.0WATER27.04.198620341.6036.015.0WATER27.04.198622051.6037.014.0WATER27.04.198625051.6038.015.0WATER28.04.198625881.6030.023.0WATER29.04.198627001.6021.013.0WATER05.05.198627151.6031.012.0WATER01.05.198627150.0030.013.0WATER01.05.198627150.0022.010.0WATER04.05.198627150.0022.010.0WATER05.05.198627150.0021.013.0WATER05.05.198628001.6017.09.0WATER06.05.198630001.6028.011.0WATER08.05.198630861.6026.012.0WATER08.05.198631261.6030.09.0WATER11.05.198632231.6025.09.0WATER11.05.198633081.6024.09.0WATER11.05.198633901.9531.07.0WATER BASED30.06.198634621.6023.010.0WATER12.05.198635691.6024.011.0WATER13.05.198636001.9131.07.0WATER BASED08.06.198636011.6023.012.0WATER14.05.198636401.9138.010.0WATER BASED04.06.198636541.6024.011.0WATER15.05.198636941.6531.014.0WATER19.05.198637281.6529.012.0WATER19.05.198637351.9520.04.0WATER BASED02.09.198637351.9521.03.0WATER BASED02.09.198637371.9333.05.0WATER BASED22.06.198637371.9332.06.0WATER BASED26.06.198637371.9335.06.0WATER BASED10.06.198637371.9332.07.0WATER BASED11.06.198637371.9331.06.0WATER BASED12.06.198637371.9333.05.0WATER BASED15.06.198637371.9332.07.0WATER BASED15.06.198637371.9332.08.0WATER BASED15.06.198637371.9332.05.0WATER BASED16.06.198637371.9331.05.0WATER BASED17.06.198637371.9333.05.0WATER BASED18.06.198637371.9332.05.0WATER BASED19.06.198637371.9330.07.0WATER BASED22.06.198637371.9331.06.0WATER BASED22.06.198637371.9330.06.0WATER BASED23.06.198637371.9330.06.0WATER BASED24.06.198637371.9329.06.0WATER BASED25.06.198637371.6528.011.0WATER19.05.198637411.9035.06.0WATER BASED01.06.198637411.9038.05.0WATER BASED01.06.198637461.9136.07.0WATER BASED02.06.198637501.9235.08.0WATER BASED08.06.198637501.9335.08.0WATER BASED09.06.198637501.9339.09.0WATER BASED08.06.198637661.9138.011.0WATER BASED05.06.198637661.6532.013.0WATER19.05.198637991.7836.012.0WATER BASED20.05.198638071.9038.015.0WATER BASED21.05.198638111.8836.012.0WATER BASED24.05.198638111.8837.011.0WATER BASED26.05.198638111.9038.011.0WATER BASED26.05.198638111.9140.05.0WATER BASED27.05.198638111.9139.05.0WATER BASED27.05.198638111.9134.06.0WATER BASED29.05.198638111.9037.08.0WATER BASED01.06.198638111.9141.011.0WATER BASED03.06.198638111.8842.07.0WATER BASED26.05.198638111.9136.06.0WATER BASED28.05.198638161.9532.06.0WATER BASED30.06.198638482.0244.09.0WATER BASED30.06.198639042.0548.09.0WATER BASED30.06.198639562.0746.08.0WATER BASED01.07.198639562.1038.07.0WATER BASED03.07.198639652.1036.07.0WATER BASED07.07.198639652.1028.06.0WATER BASED07.07.198639652.1024.06.0WATER BASED07.07.198639652.1025.06.0WATER BASED08.07.198639652.1024.07.0WATER BASED09.07.198639652.1025.06.0WATER BASED10.07.198639652.1024.06.0WATER BASED11.07.198639652.1030.06.0WATER BASED14.07.198639652.1025.06.0WATER BASED14.07.198639652.1024.06.0WATER BASED14.07.198639652.1026.06.0WATER BASED15.07.198639652.1039.07.0WATER BASED02.07.198639652.1021.06.0WATER BASED16.07.198639682.1422.04.0WATER BASED17.07.198639682.1423.04.0WATER BASED18.07.198639802.1221.03.0WATER BASED21.07.198639832.1221.03.0WATER BASED21.07.198640062.0920.03.0WATER BASED21.07.198640622.0925.05.0WATER BASED23.07.198640882.0941.07.0WATER BASED24.07.198640882.0940.08.0WATER BASED25.07.198640882.0930.05.0WATER BASED28.07.198640882.0934.07.0WATER BASED23.07.198640882.0936.07.0WATER BASED28.07.198640882.0934.05.0WATER BASED28.07.198640882.0930.05.0WATER BASED29.07.198640882.0926.05.0WATER BASED30.07.198640912.0929.03.0WATER BASED31.07.198641332.0926.03.0WATER BASED01.08.198642342.0925.04.0WATER BASED04.08.198643042.0927.04.0WATER BASED04.08.198643972.1026.04.0WATER BASED04.08.198644842.1229.04.0WATER BASED05.08.198645672.1229.04.0WATER BASED06.08.198646232.1229.04.0WATER BASED07.08.198646472.1229.04.0WATER BASED08.08.198646602.1229.04.0WATER BASED10.08.198646602.1029.05.0WATER BASED10.08.198647442.1028.05.0WATER BASED10.08.198648282.1029.05.0WATER BASED11.08.198648972.1130.05.0WATER BASED13.08.198649512.1234.05.0WATER BASED13.08.198650112.1229.04.0WATER BASED14.08.198650422.1331.05.0WATER BASED17.08.198650422.1326.04.0WATER BASED17.08.198650422.1324.04.0WATER BASED17.08.198650422.1327.05.0WATER BASED18.08.198650422.1327.04.0WATER BASED20.08.198650422.1329.05.0WATER BASED21.08.198650422.1327.04.0WATER BASED24.08.198650422.1333.06.0WATER BASED24.08.198650422.1428.07.0WATER BASED25.08.198650422.1426.06.0WATER BASED26.08.198650422.1429.06.0WATER BASED28.08.198650422.1424.05.0WATER BASED29.08.198650422.1426.05.0WATER BASED02.09.198650422.1326.05.0WATER BASED19.08.198650422.1327.05.0WATER BASED24.08.1986