6506/12-5
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General information
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Wellbore history
GeneralWell 6506/12-5 was the third well drilled on the Smørbukk Sør Discovery (Beta-structure) in block 6506/12, Haltenbanken area. The well was designed to appraise the hydrocarbon potential and define the hydrocarbon-water contacts. Primary target was Middle and Early Jurassic sandstone. The Fangst Group siltstone member was expected to be sealing at this depth. The well would also test if intervals within the Ror and Tilje formations also could be sealing rocks. Secondary target was the Late Cretaceous Lysing Formation of the Cromer Knoll Group.Prognosed TD was in the Åre formation at 4559 m RKB.Operations and resultsAppraisal well 6506/12-5 was spudded with the semi-submersible installation Dyvi Delta on 17 October 1985 and drilled to TD at 4587 m in the Early Jurassic Åre Formation. The well was drilled with less than 2.5 deg deviation down to 4235 m. There were minor incidents with a failed anchor and lost circulation in the top hole. A poorly cemented 9 5/8" casing required 116 hours amendment before normal drilling could commence. The well was drilled with spud mud down to 393 m. From here a pilot hole was drilled to 1080 m using gypsum/polymer mud, and then opened up using spud mud. Further drilling was with gypsum/polymer mud from 1080 m to 3519 m, and with gel/lignite/lignosulphonate from 3519 m to TD. Shallow gas was not encountered.Secondary target Lysing Formation came in at 3157 m and primary target Garn Formation at 3948 m. Hydrocarbons were encountered in both. An OWC was found in the Lysing Formation at 3178.2 m, and another OWC in the Garn Formation at 4010.5 m. The Not Formation as well as top of the Garn Formation was found to be sealing in this well.Cores were cut in the Upper Cromer Knoll Lysing Sands and throughout most of the interval from the lower part of the Viking Group at 3910 m down to 4362 m in the Tilje Formation. A total of 429.43 m was recovered in 27 cores. Core no 9 in the Garn Formation was taken with a specially designed core barrel where the formation fluids that exude from the core is captured on a sponge lining the inside of the core barrel ("sponge core"). One SFT (Geco) was run in the Lysing Formation and 2 RFT runs (Schlumberger) were made in the Fangst and Båt Groups down to the Tilje Formation. A total of 82 pressure tests were performed in these runs and 45 of these gave reliable results. In addition, segregated samples were collected at 4 different depths; 3176 m, 3165.5 m, 4004 m, and 4029.5 m.The well was permanently abandoned on 27 March 1986 as an oil and gas appraisalTestingFour DST-tests were carried out in the well.DST 1 tested the interval 4025 m to 4040 m in the base part of the Garn Formation. It produced 250 m3 water/day through a 19.1 mm choke. The temperature recorded in this flow was 141 deg C.DST 2 tested the interval 4004 m to 4009.5 m in the middle part of the Garn Formation. It produced 140 Sm3 oil, 41 Sm3 gas and 40 m3 water /day through an 11.1 mm choke. The GOR was 293 Sm3/Sm3, the oil density was 0.835 g/cm3, and the gas gravity was 0.895 (air = 1). The temperature recorded in this flow was 140 deg C.DST 3 tested the interval 3983 m to 3996 m in the middle part of the Garn Formation. It produced 2.4 Sm3 oil/daythrough the bubble hose. The temperature recorded in this flow was 139 deg C.DST 4 tested the interval 3174 m to 3177.5 m in the Lysing Formation. It produced 440 Sm3 light oil and 75 Sm3 gas/day through an 11.1 mm choke. The GOR was 170 Sm3/Sm3, the oil density was 0.800 g/cm3, and the gas gravity was 0.718 (air = 1). The temperature recorded in this flow was 112 deg C. -
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]400.004587.50 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom13148.03175.2[m ]23175.23188.0[m ]33910.03917.7[m ]43918.03928.3[m ]53929.03943.7[m ]63944.03949.0[m ]73949.03967.5[m ]83967.53993.7[m ]104004.04030.9[m ]114031.04046.2[m ]124046.54064.5[m ]134064.54066.6[m ]144067.04080.5[m ]154085.04106.6[m ]164112.04123.8[m ]174124.04135.8[m ]184136.04154.1[m ]194154.04179.8[m ]204180.04203.5[m ]214205.04216.0[m ]224245.04269.0[m ]234271.04285.6[m ]244286.04299.8[m ]254305.04324.5[m ]264327.04335.0[m ]274335.04361.9[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]428.2Cores 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 typeLaboratory3148.9[m]COD3149.5[m]C3155.0[m]C3155.6[m]COD3156.5[m]C3159.4[m]C3160.3[m]COD3161.2[m]COD3161.9[m]C3165.0[m]COD3165.9[m]C3166.0[m]COD3166.3[m]C3168.0[m]C3170.0[m]C3170.4[m]COD3172.0[m]C3173.5[m]C3174.7[m]COD3174.8[m]C3175.3[m]C3177.3[m]C3178.0[m]C3178.8[m]COD3179.3[m]C3180.5[m]C3182.6[m]C3182.7[m]COD3183.9[m]COD3184.0[m]C3184.6[m]C3185.4[m]COD3185.5[m]C3185.8[m]C3185.9[m]COD3187.0[m]C3187.4[m]C3188.0[m]C3436.0[m]SWCSTAT3636.0[m]SWCSTAT3680.0[m]SWCSTAT3735.0[m]SWCSTAT3747.0[m]SWCSTAT3785.0[m]SWCSTAT3792.0[m]SWCSTAT3795.5[m]SWCSTAT3796.5[m]SWCSTAT3802.0[m]SWCSTAT3806.5[m]SWCSTAT3810.0[m]SWCSTAT3812.0[m]SWCSTAT3830.5[m]SWCSTAT3832.0[m]SWCSTAT3880.0[m]SWCSTAT3945.8[m]CHYDRO3950.2[m]CHYDRO3963.4[m]CHYDRO3966.9[m]CHYDRO3974.5[m]CHYDRO3981.5[m]CHYDRO3986.5[m]CHYDRO3993.3[m]CHYDRO4004.5[m]CHYDRO4014.8[m]CHYDRO4021.5[m]CHYDRO4037.8[m]CHYDRO4043.5[m]CHYDRO4048.5[m]CHYDRO4052.7[m]CHYDRO4056.6[m]CHYDRO4056.6[m]CHYDRO4061.4[m]CHYDRO4065.6[m]CHYDRO4067.5[m]CHYDRO4071.8[m]CHYDRO4073.4[m]CHYDRO4077.6[m]CHYDRO4079.4[m]CHYDRO4088.6[m]CHYDRO4096.8[m]CHYDRO4102.3[m]CHYDRO4117.4[m]CHYDRO4123.5[m]CHYDRO4135.1[m]CHYDRO4141.6[m]CHYDRO4271.1[m]COD4273.1[m]COD4274.0[m]COD4274.2[m]COD4275.1[m]COD4275.6[m]COD4275.9[m]COD4276.9[m]COD -
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 availableDSTDST24004.004009.5021.02.1986 - 21:46YESDSTDST2B0.000.0023.02.1986 - 06:45YESDSTDST43145.003148.5012.03.1986 - 23:10YES -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit330330133519641964223522352283234631573157318737803780382739483948404040684138413842744510 -
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]pdf3.08pdf3.21 -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.04040402519.01.14040402519.02.04004401019.02.14004401019.04.03174317815.9Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.01.0001.00010.0001411.12.041.0001402.140.00016.00041.0004.045.0008.00024.000Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.01.12.0208550000.8272642.1208550000.8272644.05901160000.800196 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL GR3253827CBL GR9792273CBL GR30663224CBL GR30693222CBL GR37404124CBL VDL37364018CBL VDL GR30803880CDL CNS GR3884584CET GR30804038DIL BCS GR38804584DIL LSS GR3883898DLL MSF GR31293247DLL MSF GR39004584DLL MSFL GR38804150FED GR30973899ISF LSS MSFL GR22744176LDL CNL GR22744177LDL CNL NGS38804586LSAL38834587MWD - GR RES DIR3883897NGS38804586RFT GR31583183RFT GR39674484RFT GR39834161SDT38804581SHDT GR38804586SWC GR34233890VELOCITY22184580 -
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 typeCONDUCTOR30392.036400.00.00LOTSURF.COND.201055.0261080.01.69LOTINTERM.13 3/82280.017 1/22296.01.91LOTINTERM.9 5/83885.012 1/43901.01.95LOTLINER74178.00.00.00 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured10801.1215.010.0WATER BASED28.10.198510801.128.010.1WATER BASED29.10.198511981.125.08.0WATER BASED05.11.198513201.2012.09.0WATER BASED05.11.198516071.3012.010.0WATER BASED07.11.198519321.3515.0110.9WATER BASED07.11.198521291.4518.012.8WATER BASED08.11.198522171.5720.017.3WATER BASED11.11.198522171.5018.014.8WATER BASED11.11.198522891.6020.013.9WATER BASED11.11.198522891.6417.09.0WATER BASED12.11.198525391.6522.09.0WATER BASED18.11.198525391.7224.08.0WATER BASED18.11.198525401.7223.08.0WATER BASED18.11.198525851.7223.08.0WATER BASED18.11.198526771.7224.08.0WATER BASED18.11.198530001.7227.08.0WATERBASED17.03.198631051.7220.09.0WATER BASED25.11.198531741.6114.08.0WATERBASED12.03.198638831.215.85.0WATER BASED24.12.198539031.2213.06.0WATER BASED24.12.198539141.1714.04.9WATER BASED11.02.198639141.1717.04.9WATER BASED16.01.198639141.1717.04.9WATER BASED11.02.198639141.1715.04.9WATER BASED11.02.198639141.1714.04.9WATER BASED14.02.198639291.2215.04.1WATER BASED02.01.198640461.1710.03.9WATER BASED06.01.198641801.1216.03.3WATER BASED14.01.1986 -
Thin sections at the Norwegian Offshore Directorate
Thin sections at the Norwegian Offshore Directorate DepthUnit3175.05[m ]3178.65[m ]3182.35[m ]3184.75[m ]3158.10[m ] -
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]pdf0.23