6407/2-3
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General information
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Wellbore history
GeneralWell 6407/2-3 was drilled down dip on the Delta structure on the southern fault compartment of the Midgard Field off shore mid Norway. The primary objectives were to test for hydrocarbons in the Middle Jurassic Fangst Group, and establish the hydrocarbon contact. Secondary objectives were testing the thickness and facies development of reservoir units in response to growth faulting. Shallow gas was expected at several levels due to experience from nearby wells. Fangst Group was prognosed to come in at 2417 m, gas/oil contact at 2514 m, and the oil/water contact at 2525 m. TD was expected to be 3050 m.Operations and resultsWell 6407/2-3 was spudded with the semi-submersible installation Treasure Saga on 7 November 1986 and drilled to TD at 3050 m in Early Jurassic sediments of the Åre Formation. Gas peaks above 1% gas value were observed at 532 m, 590 m, 630 m, 755 m, and 802 m, the two latter showing the highest values at approximately 1.8%. The whole section was drilled using relatively high mud weights around 1.15 g/cm, which makes the recorded gas values significant. While tripping out at 2645 m prior to logging, the string got stuck. After nine days of fishing it was decided to sidetrack. The 9/58" casing was set at 2371 m and the sidetrack was kicked of at 2387 m. The well was drilled with spud mud down to 915 m and with gypsum/polymer mud from 915 m to 2645 m where the pipe stuck. No wire line logs were run in the interval 2432 - 2465 in this hole, only MWD. The final 8 1/2" sidetrack from 2371 m to TD was drilled with gel mud.The Fangst Group came in at 2427 m, ten meters below prognosis. It was gas-filled down to a gas/water contact at 2523 m (2521 m TVD RKB). No oil leg could be seen. No shows were seen in cuttings, but poor shows with good hydrocarbon odour were described on cores down to 2526 m in the Ile Formation. Fluorescence was very weak blue white and cut reaction very slow. Weak dark yellow brown fluorescence was recorded in sandstone in the Tilje core at 2760 - 2764 m. No stain, cut, or odour was associated with his fluorescence.Eight cores were cut from 2428 - 2573.1 m (recovered 142.8 m, 96.5%) in the Fangst Group and across the GWC contact. Down to the GWC it consisted of two sandstone units (Garn and Ile Formations) separated by one silty shale zone (the Not Formation). These cores were cut in the original hole, before side tracking. Core number 9 was cut in the side track hole from 2741 - 2769 m in the Tilje Formation (recovered 28 m, 100%). The lithology was sandstone interlaminated with shale. Porosity was predominantly poor. Segregated fluid samples were taken at 2428, 2430, and 2510.5 m.The well was permanently abandoned on 23 January 1987 as a gas/condensate discovery.TestingTwo production tests were carried out and both produced a lean gas similar to what is found in the rest of the Midgard Field.Test No. 1 (2508.7 - 2518.2 m RKB, 2480.7 - 2490.2 TVD m MSL) perforated the Ile Formation and produced gas at a maximum rate of 1.285.000 Sm3 /day through a 38.1 mm choke at a well head pressure of 88 bar. The condensate/gas ratio was 0.000211 Sm3/Sm3 (GOR = 4740 Sm3/Sm3). The down-hole temperature recorded in the test was 91.8 deg C. API gravity of the dead condensate was 49.3 deg.Test No. 2 (2427.8 - 2435.8 m RKB, 2400.3 - 2408.3 TVD m MSL) perforated the Garn Formation and produced gas at a maximum rate of 1.320.500 Sm3 /day through a 38.1 mm choke at a well head pressure of 88.7 bar. The condensate/gas ratio was 0.000161 Sm3/Sm3 (GOR = 6210 Sm3/Sm3). The down-hole temperature recorded in the test was 89.2 deg C. API gravity of the dead condensate was 49.0 deg. -
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]400.003049.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12428.02455.5[m ]22455.52476.5[m ]32476.52502.4[m ]42502.52511.0[m ]52511.02538.7[m ]62538.52556.5[m ]72557.02558.0[m ]82558.02571.6[m ]102741.02769.0[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]171.2Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
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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 availableDSTDST12518.202508.7006.01.1987 - 16:10YESDSTDST 22427.802435.8013.01.1987 - 13:30YES -
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 typeCONDUCTOR30398.036403.00.00LOTSURF.COND.20900.026915.01.51LOTINTERM.13 3/81954.017 1/22104.01.83LOTINTERM.9 5/82371.012 1/42645.01.69LOTLINER72625.08 1/23050.00.00LOT -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.02518250938.12.02436242838.1Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.09.00017.000922.09.00017.00089Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.027112850000.7660.70547402.021313210000.7680.7056210 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]ACBL VDL6841952ACBL VDL BHC GR16902610CDL9001953CNL CDL GR19522431CNL LDC SPECTRA GR23683051COREGUN9201935COREGUN19522429COREGUN23693047DIFL LSBHC GR399913DIFL LSBHC GR9001969DIFL LSBHC GR19522431DIFL LSBHC GR23693049DIPLOG19522429DIPLOG23683047DLL MLL GR23683047FMT24282741MWD - GR RES DIR3993047VSP3843006ZDENS23683034 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit27613111966196620252072232023932393239924272427248025092581258127392910 -
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]pdf7.67pdf2.28 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured2861.06WATER BASED10.11.19863271.06WATER BASED11.11.19864031.06WATER BASED17.11.19865311.135.019.2WATER BASED17.11.19869151.146.017.3WATER BASED17.11.19869151.187.019.2WATER BASED17.11.19869151.208.014.4WATER BASED18.11.19869151.1025.016.8WATER BASED19.11.19869151.1024.015.9WATER BASED18.11.19869251.186.017.3WATER BASED17.11.198611191.1215.08.7WATER BASED20.11.198613451.1513.05.8WATER BASED21.11.198617701.3018.09.1WATER BASED24.11.198619681.4516.05.3WATER BASED24.11.198619681.4520.06.3WATER BASED24.11.198619681.4516.05.3WATER BASED02.12.198621041.5028.09.1WATER BASED02.12.198621151.5818.06.3WATER BASED02.12.198621151.5819.010.1WATER BASED02.12.198621151.5821.09.1WATER BASED02.12.198621151.5824.07.2WATER BASED02.12.198621151.5817.08.2WATER BASED05.12.198621151.5815.06.3WATER BASED08.12.198621151.5815.06.8WATER BASED08.12.198621151.5815.06.8WATER BASED09.12.198621151.5818.06.8WATER BASED02.12.198622280.0016.07.2WATER BASED13.01.198722280.0016.06.8WATER BASED09.01.198722880.0016.07.2WATER BASED12.01.198723450.0012.06.8WATER BASED15.01.198723710.0015.06.8WATER BASED22.12.198623861.5814.06.8WATER BASED16.12.198623861.5814.06.8WATER BASED17.12.198623861.2714.05.3WATER BASED22.12.198623871.2715.06.8WATER BASED22.12.198624250.0016.07.2WATER BASED12.01.198725050.0014.06.3WATER BASED22.12.198625571.5813.06.8WATER BASED05.12.198625731.5813.06.3WATER BASED05.12.198625880.0014.06.8WATER BASED14.01.198726400.0015.06.8WATER BASED09.01.198726400.0014.04.8WATER BASED02.01.198726400.0015.05.3WATER BASED05.01.198726400.0015.05.3WATER BASED06.01.198726400.0014.05.3WATER BASED08.01.198726451.4815.07.7WATER BASED09.12.198626451.5815.08.7WATER BASED11.12.198626451.5818.08.2WATER BASED11.12.198626451.5817.08.7WATER BASED10.12.198626451.5816.07.2WATER BASED15.12.198626451.5816.07.7WATER BASED16.12.198626451.5817.06.3WATER BASED16.12.198626451.5915.07.2WATER BASED16.12.198626470.0016.07.7WATER BASED22.12.198627410.0017.07.2WATER BASED29.12.198627980.0016.07.7WATER BASED29.12.198630360.0019.08.2WATER BASED29.12.198630500.0019.07.7WATER BASED29.12.198630500.0016.06.8WATER BASED02.01.198730500.0018.06.8WATER BASED02.01.198730500.0019.07.7WATER BASED02.01.198730500.0015.05.3WATER BASED05.01.198730500.0016.05.8WATER BASED05.01.1987 -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory409.0[m]SWCRRI429.5[m]SWCRRI452.5[m]SWCRRI468.0[m]SWCRRI473.5[m]SWCRRI489.1[m]SWCRRI500.0[m]SWCRRI528.0[m]SWCRRI544.5[m]SWCRRI570.0[m]SWCRRI593.0[m]SWCRRI615.0[m]SWCRRI632.0[m]SWCRRI640.5[m]SWCRRI668.5[m]SWCRRI689.5[m]SWCRRI695.9[m]SWCRRI708.6[m]SWCRRI730.0[m]SWCRRI752.0[m]SWCRRI775.2[m]SWCRRI807.0[m]SWCRRI837.0[m]SWCRRI862.0[m]SWCRRI899.0[m]SWCRRI972.0[m]SWCRRI1010.0[m]SWCRRI1030.0[m]SWCRRI1060.0[m]SWCRRI1190.0[m]SWCRRI1260.0[m]SWCRRI1290.0[m]SWCRRI1310.0[m]SWCRRI1340.0[m]SWCRRI1426.0[m]SWCRRI1470.0[m]SWCRRI1506.0[m]SWCRRI1553.0[m]SWCRRI1584.0[m]SWCRRI1630.0[m]SWCRRI1650.0[m]SWCRRI1856.0[m]SWCRRI1900.0[m]SWCRRI2070.0[m]SWCRRI2106.5[m]SWCRRI2150.5[m]SWCRRI2200.0[m]SWCRRI2232.0[m]SWCRRI2260.0[m]SWCRRI2280.0[m]SWCRRI2315.0[m]SWCRRI2323.0[m]SWCRRI2347.0[m]SWCRRI2360.0[m]SWCRRI2383.0[m]SWCRRI2398.0[m]SWCRRI