1/3-5
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General information
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Wellbore history
GeneralWell 1/3-5 was drilled on a NW-SE oriented fault block tilted towards the NW. The structure is located in the northern Permian basin, on the east side of Central Graben, extending into blocks 116, 211, and 2/4. The purpose of the well was to evaluate the hydrocarbon potential of the Rotliegendes Group sandstones.Operations and resultsWildcat well 1/3-5 was spudded with the 3-leg jack up installation Neddrill Trigon on 1 October 1984 and drilled to TD at 4850 m in the Permian Rotliegendes Group. After setting the 30" conductor a 14 3/4" pilot hole was drilled to 1195 m, before opening the hole to 26". Drilling to 2470 m the mud weight was raised from 1.33 g/cm3 to 1.70 g/cm3 due to high formation pressure. This resulted in tight hole during wiper trips, and high weight strain on the drill string, and also caused the 13 3/8" casing to be set somewhat higher than prognosed. Through the chalk sequence the hole seemed to be tight, and while tripping at 3523 m, the drill string got stuck with the bit at 3515 m. It was assumed that the tight interval was caused by one of the stabilizers between 3247 and 3267 m. The string was freed by pumping acid. A high pressure sand sequence in the interval 4363-4395 m, with pore pressure close to the last leak-off Test, resulted in the 7" liner being set 520 m higher than prognosed. The well was drilled with spud mud down to 1195 m, with KCl/polymer mud from 1195 m to 3000 m, from 3000 m the mud was lightly treated with lignosulphonate. Fifty bbl of pipelax with a mud/diesel ratio of 1:1 was added to the mud to free the stuck pipe at 3515 m. From 4122 m to TD the well was drilled with a polymer/sulphonated resin mud.Traces of yellow direct fluorescence, mainly on fractures, with a moderate milky-white cut fluorescence were observed at the top of the Tor Formation and at several levels deeper down in the formation. Also near the base of the Hod Formation, a very weak and slow pale yellowish cut fluorescence was occasionally observed. Direct fluorescence was not detected. Petrophysical analysis supported that some zones in the lower Hod Formation (4369 m to 4448 m) could be marginally hydrocarbon bearing. The objective Rotliegendes sand came in at 4769 m. Results from permeability measurements indicated that the sand was water bearing and tight, although porosity readings from the core from this sand were surprisingly high. A water-bearing formation was supported also by low background gas readings and lack of shows while drilling through the interval.One core was cut in the Rotliegendes Group sandstones from 4805 m - 4814 m. An FMT sample taken at 4387 m (Lower Hod Formation) recovered mud filtrate only. An FMT sample taken at 4770 m near the top of the Rotliegendes Group recovered mud filtrate, with no indications of hydrocarbons.The well was permanently abandoned on 11 February 1985 as a dry well with shows.TestingNo drill stem test was performed in the well. -
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]180.004850.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom14805.04814.0[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]9.0Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
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 typeCONDUCTOR30168.036181.00.00LOTSURF.COND.201183.0261195.01.77LOTINTERM.13 3/82443.017 1/22470.01.91LOTINTERM.9 5/84122.012 1/44138.02.12LOTLINER74395.08 1/24395.02.33LOTOPEN HOLE4850.064850.00.00LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]4ARM CAL1502455ACBL VDL702443ACBL VDL12254105CDL CNL GR26734850DIFL ACL GR1004804DIPLOG41214791DLL MLL40924851FMT31553677FMT42884391FMT45294836SWS41394395SWS43954850TEMP15295TEMP1004106VSP1004795 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit1061075306230623070307831533206324532883288338438584568458045804604462547344769 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.65 -
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]pdf3.19pdf2.41 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured1571.03WATER BASED03.10.19841601.03WATER BASED03.10.19841621.03WATER BASED08.10.19841691.03WATER BASED08.10.19844501.03WATER BASED08.10.19847351.0952.034.0WATER BASED08.10.198410911.129.036.0WATER BASED08.10.198411951.115.024.0WATER BASED09.10.198411951.12WATER BASED10.10.198411951.14WATER BASED11.10.198411951.14WATER BASED14.10.198411951.14WATER BASED15.10.198411951.03WATER BASED17.10.198411951.1313.032.0WATER BASED08.10.198411951.03WATER BASED17.10.198411951.115.024.0WATER BASED09.10.198411951.12WATER BASED10.10.198411951.14WATER BASED11.10.198411951.14WATER BASED14.10.198411951.14WATER BASED15.10.198412921.25WATER BASED17.10.198414101.3018.018.0WATER BASED18.10.198416401.5028.017.0WATER BASED21.10.198416501.5035.09.0WATER BASED21.10.198418411.6550.016.0WATER BASED21.10.198420511.7040.010.0WATER BASED22.10.198421861.7026.010.0WATER BASED23.10.198423391.7038.06.0WATER BASED24.10.198424701.7023.013.0WATER BASED25.10.198424701.7026.06.0WATER BASED29.10.198424701.7023.06.0WATER BASED29.10.198424701.7030.06.0WATER BASED30.10.198424701.7021.08.0WATER BASED31.10.198424701.6822.08.0WATER BASED01.11.198424701.6822.08.0WATER BASED02.11.198424701.7020.014.0WATER BASED05.11.198424701.7021.014.0WATER BASED05.11.198424701.7026.06.0WATER BASED29.10.198424701.7023.06.0WATER BASED29.10.198424701.7031.08.0WATER BASED29.10.198424701.7030.06.0WATER BASED30.10.198424701.7021.08.0WATER BASED31.10.198424701.6822.08.0WATER BASED01.11.198424701.6822.08.0WATER BASED02.11.198424701.7020.014.0WATER BASED05.11.198424701.7021.014.0WATER BASED05.11.198424701.7031.08.0WATER BASED29.10.198426651.7025.08.0WATER BASED06.11.198428401.7036.013.0WATER BASED06.11.198428731.7046.022.0WATER BASED07.11.198429801.7139.018.0WATER BASED08.11.198430491.7043.020.0WATER BASED09.11.198430891.7039.023.0WATER BASED12.11.198431031.7039.020.0WATER BASED12.11.198431611.7039.020.0WATER BASED12.11.198432461.7040.018.0WATER BASED13.11.198432691.7039.018.0WATER BASED15.11.198433421.7035.015.0WATER BASED15.11.198433651.7030.015.0WATER BASED16.11.198434281.7029.014.0WATER BASED19.11.198435131.7028.013.0WATER BASED19.11.198435631.7029.012.0WATER BASED19.11.198435631.7030.018.0WATER BASED20.11.198435631.7030.018.0WATER BASED21.11.198435631.7028.011.0WATER BASED22.11.198435631.7030.018.0WATER BASED20.11.198435631.7030.018.0WATER BASED21.11.198435631.7028.011.0WATER BASED22.11.198436281.7027.014.0WATER BASED23.11.198436461.7025.011.0WATER BASED26.11.198437451.7032.015.0WATER BASED26.11.198438491.7032.019.0WATER BASED26.11.198439571.7040.020.0WATER BASED27.11.198440401.7235.019.0WATER BASED28.11.198441071.7534.015.0WATER BASED29.11.198441381.8039.018.0WATER BASED04.12.198441381.8038.016.0WATER BASED04.12.198441381.8031.015.0WATER BASED04.12.198441381.8038.018.0WATER BASED05.12.198441381.8038.018.0WATER BASED06.12.198441381.8138.019.0WATER BASED07.12.198441381.8133.016.0WATER BASED10.12.198441381.8134.015.0WATER BASED10.12.198441381.8138.019.0WATER BASED10.12.198441381.8026.014.0WATER BASED11.12.198441381.8039.018.0WATER BASED30.11.198441381.8038.016.0WATER BASED04.12.198441381.8138.019.0WATER BASED10.12.198441381.8026.014.0WATER BASED11.12.198441381.8039.018.0WATER BASED04.12.198441381.8031.015.0WATER BASED04.12.198441381.8038.018.0WATER BASED05.12.198441381.8038.018.0WATER BASED06.12.198441381.8138.019.0WATER BASED07.12.198441381.8133.016.0WATER BASED10.12.198441381.8134.015.0WATER BASED10.12.198441491.8018.012.0WATER BASED12.12.198442351.8126.011.0WATER BASED12.12.198442831.9533.015.0WATER BASED17.12.198443292.0037.019.0WATER BASED17.12.198443292.0028.017.0WATER BASED17.12.198443292.0028.017.0WATER BASED17.12.198443642.0227.015.0WATER BASED17.12.198443952.0833.020.0WATER BASED19.12.198443950.0036.015.0WATER BASED19.12.198443952.0836.015.0WATER BASED20.12.198443952.0837.013.0WATER BASED26.12.198443952.0838.013.0WATER BASED26.12.198443952.0838.014.0WATER BASED26.12.198443952.0836.013.0WATER BASED26.12.198443952.0838.014.0WATER BASED27.12.198443952.0837.012.0WATER BASED27.12.198443952.0729.010.0WATER BASED01.01.198543952.0831.09.0WATER BASED01.01.198543952.0833.020.0WATER BASED18.12.198443952.0836.015.0WATER BASED18.12.198443952.0836.015.0WATER BASED20.12.198443952.0837.013.0WATER BASED26.12.198443952.0837.014.0WATER BASED26.12.198443952.0838.013.0WATER BASED26.12.198443952.0836.013.0WATER BASED26.12.198443952.0838.014.0WATER BASED26.12.198443952.0837.012.0WATER BASED27.12.198443952.0729.010.0WATER BASED01.01.198543952.0834.010.0WATER BASED01.01.198543952.0837.014.0WATER BASED26.12.198443952.0838.014.0WATER BASED26.12.198443952.0834.010.0WATER BASED01.01.198543952.0838.014.0WATER BASED26.12.198443952.0838.014.0WATER BASED27.12.198443952.0831.09.0WATER BASED01.01.198544232.1132.010.0WATER BASED01.01.198544672.1135.011.0WATER BASED01.01.198545132.1132.09.0WATER BASED02.01.198545132.1132.010.0WATER BASED03.01.198545132.1132.010.0WATER BASED03.01.198545482.1128.08.0WATER BASED07.01.198545602.1131.011.0WATER BASED07.01.198545922.1128.08.0WATER BASED07.01.198546052.1127.08.0WATER BASED07.01.198546622.1127.07.0WATER BASED09.01.198547102.1127.09.0WATER BASED10.01.198547102.1126.08.0WATER BASED10.01.198547102.1127.09.0WATER BASED14.01.198547102.1126.08.0WATER BASED10.01.198547102.1127.09.0WATER BASED14.01.198547272.1129.09.0WATER BASED14.01.198547622.1128.08.0WATER BASED14.01.198548052.1128.011.0WATER BASED15.01.198548052.1128.012.0WATER BASED16.01.198548052.1128.012.0WATER BASED16.01.198548142.1128.016.0WATER BASED21.01.198548142.1129.014.0WATER BASED17.01.198548142.1128.016.0WATER BASED21.01.198548502.1126.010.0WATER BASED21.01.198548502.1128.013.0WATER BASED21.01.198548502.1129.014.0WATER BASED21.01.198548502.1129.013.0WATER BASED21.01.198548502.1129.014.0WATER BASED21.01.198548502.1129.013.0WATER BASED21.01.198548502.1128.013.0WATER BASED21.01.1985 -
Thin sections at the Norwegian Offshore Directorate
Thin sections at the Norwegian Offshore Directorate DepthUnit4809.00[m ]4812.00[m ]4805.35[m ]4810.35[m ]