6406/8-1
Export: PDF
-
General information
-
Wellbore history
GeneralBlock 6406/8 is located on the Haltenbanken offshore Mid-Norway, in the southwestern corner of the Halten Terrace, approximately 215 km west north west of Trondheim. The primary objective of exploration well 6406/8-1 was to test the hydrocarbon potential in the Middle Jurassic Fangst group and the Lower Jurassic Båt group (Ror and Tilje formations). Possible intra-Cretaceous sands related to a seismic marker were considered as second target. Well 6406/8-1 was the first well drilled on the licence. It is located on a domal structure at the Base Cretaceous Unconformity. The prognosed TD for the well was 5027 m.Operations and resultsWell 6406/8-1 was spudded with the semi-submersible installation SSDV Vinni on 15 September 1987 and drilled to final TD at 4914 m in the Early Jurassic Åre Formation. The well was drilled water based.It was drilled initially to a total depth of 4942 m where it had penetrated the Fangst Group. The well kicked and the drill string was lost in the hole. Due to incomplete fishing operation a sidetracked well was drilled. The sidetrack was spudded on 22 January 1988 at 4262 m. The Fangst Group was once again penetrated and an intermediate logging was performed. Drilling commenced to 4914 m. Due to hazardous drilling with gains and stuck pipe it was agreed that 4914 m was to become the TD of this well. A final logging operation was made comprising FMT and RFT. The Fangst Group down to top Ile Formation was interpreted from data available from the first hole. Due to failed MWD and no wire line logs below 4500 m in the first hole the Båt Group is interpreted from the sidetrack. Horner corrected wire line log BHTs at TD gave a formation temperature of 172 deg C.Some gas dissolved in water was tested in the Ile Formation; otherwise no moveable hydrocarbons were seen in the well. Dull yellow spots and weak pale green cut fluorescence was described on sandstone from 3145 to 3190 m. Dull orange fluorescence and no cut was described on sandstone from 3985 to 4000 m. Orange/bright orange fluorescence with whitish cut fluorescence was seen on limestone from 4045 to 4060 m. All along the cores from 4368 to 4493 m, 5 to 20 % spots on sandstone with dull orange direct fluorescence and pale milky cut fluorescence was seen.Five cores were cut in the Fangst Group from 4370 m to 4499 m and one core was cut in the Båt Group, Ror Formation from 4649.5 m to 4659 m. No fluid samples were taken on wire line. The well was permanently abandoned on 11 April 1988 as a dry well with shows.TestingTwo DST tests were performed in the well. DST 1 tested the Tilje Formation in the interval 4701 - 4718.0 m. It gave no flow to surface and all results showed a water bearing and tight formation. Maximum temperature during the 4 hours test was 161 deg C. DST 2 tested the Ile Formation between 4413.5 - 4453.5 m. The first two attempts (DST 2 and DST 2B) from this interval were aborted due to technical problems and bad weather. The third attempt (DST 2C) flowed ca 1050 Sm3 gas and 145 m3 water /day through a 16/64" choke. The gas gravity was 0.765 (air=1). Gas samples were taken in this test and analyses showed a gas containing 77% methane, 3% ethane, and 19% CO2 (volume/volume). The maximum temperature was 166.3 deg C, which is ca 10 deg higher than a linear temperature gradient drawn from the log-derived BHT at TD.Due to poor pressure recordings on wire line in the Fangst Group and uncertain formation water salinity, no test was performed in the Garn Formation. -
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]1320.004905.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom14370.04388.5[m ]24388.54416.0[m ]34416.04443.8[m ]44443.84471.7[m ]54471.74498.6[m ]64649.54658.9[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]138.0Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
-
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 availableDSTDST2C0.000.00YESDSTDST2C4453.504413.50WATER26.03.1988 - 20:15YES -
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 typeCONDUCTOR30436.036477.01.10LOTSURF.COND.201301.0261316.01.50LOTINTERM.13 3/82635.017 1/22650.01.85LOTINTERM.9 5/84195.012 1/24210.02.09LOTINTERM.74640.08 1/24649.02.05LOTLINER54914.064914.00.00LOT -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.0471847116.32.0441344539.5Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.071.00048.0002.0Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.02.0 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]ACBL VDL GR3754195BHC GR41954282CDL13004191CDL CN GR41954497CDL CN GR43604907CN GR43344497COREGUN GR14532623COREGUN GR26603585COREGUN GR36104205DIFL AC GR41954911DIFL BHC GR3711136DIFL BHC GR13004497DIPLOG26314207DIPLOG41954911DLL MLL GR43614642FMT HP43684465MWD4304825RFT46714713VELOCITY6754900 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit375375174623302330259725972705275239634099409942664266431343664493449346674895 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.82 -
Geochemical information
-
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]pdf26.82 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured8151.0826.08.8WATER BASED19.05.198718051.3034.05.8WATER BASED05.10.198721101.3128.05.8WATER BASED05.10.198722361.3536.010.7WATER BASED06.10.198723201.4031.08.8WATER BASED08.10.198724441.4036.09.8WATER BASED08.10.198727701.6533.07.8WATER BASED16.10.198729561.6540.010.7WATER BASED19.10.198729691.7226.07.8WATER BASED19.10.198730951.7234.07.8WATER BASED20.10.198731261.7538.010.7WATER BASED21.10.198731901.7528.08.3WATER BASED22.10.198731951.7532.08.8WATER BASED23.10.198732641.7538.08.3WATER BASED26.10.198733551.7436.09.3WATER BASED26.10.198734421.7537.011.2WATER BASED26.10.198734971.7536.012.2WATER BASED27.10.198735261.7542.011.7WATER BASED28.10.198735841.7538.08.8WATER BASED29.10.198736551.7538.010.7WATER BASED30.10.198737341.7538.09.8WATER BASED02.11.198738021.7535.09.8WATER BASED02.11.198738861.7536.010.7WATER BASED03.11.198739331.7535.010.7WATER BASED03.11.198739581.7538.09.8WATER BASED05.11.198740151.7538.010.7WATER BASED06.11.198741301.7537.09.8WATER BASED09.11.198742001.7536.09.8WATER BASED09.11.198742191.5735.08.3WATER BASED18.11.198742621.5728.010.7WATER BASED19.11.198742861.5735.07.8WATER BASED20.11.198743011.5731.06.8WATER BASED23.11.198743491.5733.07.8WATER BASED23.11.198743511.5734.07.8WATER BASED23.11.198743511.5737.07.3WATER BASED24.11.198744431.5736.08.8WATER BASED26.11.198744431.6533.06.8WATER BASED27.11.198744501.8468.011.7WATER BASED27.01.198844721.6839.07.8WATER BASED30.11.198745551.7746.05.8WATER BASED07.12.198745781.8466.014.7WATER BASED28.01.198846161.7745.010.7WATER BASED07.12.198746491.8466.013.7WATER BASED29.01.198846491.7742.017.6WATER BASED07.12.198746681.7745.010.7WATER BASED09.12.198747511.7760.02.9WATER BASED10.12.198747521.8478.015.6WATER BASED08.02.198847601.7746.011.7WATER BASED11.12.198747631.7742.010.7WATER BASED14.12.198747861.7734.013.7WATER BASED14.12.198748521.8468.013.7WATER BASED09.02.198849011.7848.08.8WATER BASED15.12.198749141.8463.014.7WATER BASED10.02.198849261.7756.011.7WATER BASED16.12.198749421.7943.09.8WATER BASED17.12.1987 -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory2590.0[unknown]DCRRI2610.0[unknown]DCRRI2630.0[unknown]DCRRI2650.0[unknown]DCRRI2670.0[unknown]DCRRI2690.0[unknown]DCRRI2710.0[unknown]DCRRI2730.0[unknown]DCRRI2750.0[unknown]DCRRI2770.0[unknown]DCRRI2790.0[unknown]DCRRI2810.0[unknown]DCRRI2830.0[unknown]DCRRI2850.0[unknown]DCOD2870.0[unknown]DCRRI2890.0[unknown]DCRRI2910.0[unknown]DCRRI2930.0[unknown]DCRRI2950.0[unknown]DCOD2970.0[unknown]DCRRI2990.0[unknown]DCRRI3010.0[unknown]DCRRI3040.0[unknown]DCRRI3050.0[unknown]DCOD3070.0[unknown]DCRRI3090.0[unknown]DCRRI3110.0[unknown]DCRRI3130.0[unknown]DCRRI3150.0[unknown]DCOD3170.0[unknown]DCRRI3190.0[unknown]DCRRI3210.0[unknown]DCRRI3230.0[unknown]DCRRI3250.0[unknown]DCOD3270.0[unknown]DCRRI3290.0[unknown]DCRRI3310.0[unknown]DCRRI3330.0[unknown]DCRRI3350.0[unknown]DCOD3370.0[unknown]DCRRI3390.0[unknown]DCRRI3410.0[unknown]DCRRI3430.0[unknown]DCRRI3450.0[unknown]DCOD3470.0[unknown]DCRRI3490.0[unknown]DCRRI3510.0[unknown]DCRRI3530.0[unknown]DCRRI3550.0[unknown]DCOD3570.0[unknown]DCRRI3590.0[unknown]DCRRI3610.0[unknown]DCRRI3630.0[unknown]DCRRI3650.0[unknown]DCOD3670.0[unknown]DCRRI3690.0[unknown]DCRRI3710.0[unknown]DCRRI3730.0[unknown]DCRRI3750.0[unknown]DCOD3770.0[unknown]DCRRI3790.0[unknown]DCRRI3810.0[unknown]DCRRI3830.0[unknown]DCRRI3850.0[unknown]DCOD3870.0[unknown]DCRRI3890.0[unknown]DCRRI3910.0[unknown]DCRRI3925.0[unknown]DCRRI3950.0[unknown]DCOD3970.0[unknown]DCRRI3990.0[unknown]DCRRI4010.0[unknown]DCRRI4030.0[unknown]DCRRI4050.0[unknown]DCOD4070.0[unknown]DCRRI4090.0[unknown]DCRRI4110.0[unknown]DC4150.0[unknown]DCOD4250.0[unknown]DCOD4460.8[unknown]C4650.4[unknown]C4650.4[unknown]C4658.9[unknown]C4658.9[unknown]CI.S.P.G