34/8-3 A
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General information
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Wellbore history
GeneralWell 34/8-3 A is a sidetrack to well 34/8-3 on the A-structure on the Visund Field. Well 34/8-3 found oil and gas in the Brent Group without encountering the OWC. Well 34/8-3 A was sidetracked down flanks on the structure to establish the OWC and to test if the A-North could be in communication with the 34/8-1 A-South Discovery.Operations and resultsAppraisal well 34/8-3 A was kicked off at 944 m in the primary well on 14 November 1988. It was drilled with the semi-submersible installation Polar Pioneer to TD at 3230 m (3091 m TVD) in the Early Jurassic Cook Formation. During logging before setting of 9 5/8", the tool got stuck at 1284 m. The string was cut, and the instrument was fished. The well was drilled with KCl/polymer mud from kick-off to TD.Spotted hydrocarbon shows were described on cuttings in the interval 2550 to 2660 m in the Kyrre Formation. Top Draupne Formation was encountered at 3003 m. Under Draupne, the sidetrack penetrated a 19 m thick Heather Formation sequence that was not present in the primary well bore. The Brent Group, Tarbert Formation was encountered at 3031 m (2900 m TVD), deeper than prognosed due to the unexpected Heather. The Brent Formation contained gas down to a gas/oil contact at 3059 m (2927 m TVD and oil down to a clear oil/water contact at 3099.5 m (2966 m TVD). Oil shows continued down to 3162 m. The Cook Formation was found water bearing. The RFT pressures in both the primary well and the sidetrack proved higher pressure in the hydrocarbon zone than on the A-South compartment, but with pressure communication in the water zone.Five cores were cut in the interval 3034 to 3148.5 m. The drill string got stuck during cutting of the 5th core and further coring was abandoned. RFT fluid samples were taken at 3073.2 m (0.4 Sm3 gas and 2.6 litres oil in 2 3/4 gallon chamber), and 3093.0 (1 Sm3 gas and 7 litres oil 2 3/4 gallon chamber).The well was permanently abandoned on 31 October 1988 as an oil and gas appraisal well.TestingTwo drill stem test was performed in the oil zone in the Ness Formation.DST 1A tested the interval 3087 - 3093 m. It produced 746 Sm3 oil and 152640 Sm3 gas /day through a 12.7 mm (32/64") choke. The GOR was 205 Sm3/Sm3, the oil density was 0.850 g/cm3, and the gas gravity was 0.646 (air = 1) with 2 % CO2 and 1ppm H2S. The bottom hole temperature was 108.7 deg C, measured at 3020 m.DST 1B tested the intervals 3071.6 - 3078.6 m plus 3081.7 - 3093.0 m. It produced 782 Sm3 oil and 155620 Sm3 gas /day through a 12.7 mm (32/64") choke. The GOR was 199 Sm3/Sm3, the oil density was 0.850 g/cm3, and the gas gravity was 0.650 (air = 1) with 2 % CO2 and 1.2 ppm H2S. The bottom hole temperature was 109.6 deg C, measured at 3020 m. -
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]1000.003230.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom13034.03061.9[m ]23062.03079.9[m ]33081.03101.8[m ]43103.03130.9[m ]53131.03148.5[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]111.9Cores 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 availableDST3071.003093.0020.10.1988 - 00:00YESDSTDST1B3071.503078.5023.10.1988 - 00:00YES -
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 typeCONDUCTOR30491.0360.00.00LOTINTERM.13 3/8944.017 1/21475.01.67LOTINTERM.13 3/8944.017 1/21475.01.67LOTINTERM.9 5/82442.012 1/42486.01.84LOTINTERM.9 5/82442.012 1/42486.01.84LOTLINER73227.08 1/23230.00.00LOTLINER73230.08 1/23230.00.00LOT -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.03087309312.71.13072309312.7Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.01.1Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.07461530000.8500.6462051.17821560000.8500.650199 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL VDL GR18753165CST GR25253031DIL LSS GR SP4053229DLL MSFL GR SP30003182LDT CNL24433195MWD9453034MWD FE WD30623230NGT AMS24433186RFT GR AMS30343162VSP10003160 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit40511201180187318731920208820882395297530033003301230313031307131013131318431843227 -
Geochemical information
Geochemical information Document nameDocument formatDocument size [MB]pdf0.25pdf9.20 -
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]pdf2.62pdf16.59 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured9441.5320.08.0WATER BASED19.09.19889491.4021.011.0WATER BASED20.09.19889511.5222.011.0WATER BASED19.09.19889661.5223.010.0WATER BASED19.09.19889891.4022.011.0WATER BASED22.09.198811521.4023.011.0WATER BASED22.09.198812551.4021.09.0WATER BASED19.09.198814751.4024.010.0WATER BASED23.09.198817951.4124.09.0WATER BASED27.09.198820451.4024.08.0WATER BASED27.09.198823901.5024.08.0WATER BASED27.09.198824001.4020.07.0WATER BASED27.09.198824861.5218.011.0WATER BASED28.09.198824861.5220.012.0WATER BASED29.09.198824861.5222.08.0WATER BASED30.09.198824861.5224.07.0WATER BASED03.10.198824891.5223.07.0WATER BASED03.10.198825911.5223.08.0WATER BASED03.10.198826741.5221.08.0WATER BASED04.10.198829541.5522.08.0WATER BASED11.10.198830341.6024.08.0WATER BASED11.10.198830341.6022.08.0WATER BASED11.10.198831031.6025.07.0WATER BASED11.10.198831311.6023.06.0WATER BASED11.10.198831481.6024.08.0WATER BASED12.10.198831751.7026.010.0WATER BASED18.10.198831751.7026.012.0WATER BASED17.10.198831771.7028.07.0WATER BASED24.10.198831771.7027.06.0WATER BASED25.10.198831771.7028.06.0WATER BASED26.10.198831771.7029.07.0WATER BASED19.10.198831771.7029.07.0WATER BASED20.10.198831771.7029.07.0WATER BASED24.10.198831771.7027.06.0WATER BASED24.10.198831771.7130.07.0WATER BASED27.10.198831771.7130.07.0WATER BASED31.10.198831771.5015.05.0WATER BASED31.10.198832301.6026.08.0WATER BASED17.10.198832301.6026.09.0WATER BASED14.10.198832301.6026.08.0WATER BASED14.10.198832301.6024.05.0WATER BASED17.10.1988 -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory2665.0[m]SWCHYDRO2760.0[m]SWCHYDRO2885.0[m]SWCHYDRO2978.5[m]SWCHYDRO2981.0[m]SWCHYDRO2990.0[m]SWCHYDRO3005.0[m]SWCHYDRO3007.5[m]SWCHYDRO3008.0[m]SWCHYDRO3011.0[m]SWCHYDRO3016.0[m]SWCHYDRO3018.0[m]SWCHYDRO3023.0[m]SWCHYDRO3025.0[m]SWCHYDRO3029.5[m]SWCHYDRO3035.8[m]CCHYDRO3043.6[m]CCHYDRO3053.9[m]CCHYDRO3057.0[m]DCRRI3057.9[m]CCHYDRO3059.0[m]DCRRI3061.0[m]DCRRI3063.0[m]DCRRI3063.2[m]CCHYDRO3064.0[m]DCRRI3065.0[m]DCRRI3068.0[m]DCRRI3069.0[m]DCRRI3069.7[m]CCHYDRO3070.0[m]DCRRI3074.0[m]DCRRI3075.0[m]CCHYDRO3075.0[m]DCRRI3076.0[m]DCRRI3077.5[m]CCHYDRO3078.0[m]DCRRI3082.0[m]DCRRI3082.3[m]CCHYDRO3084.0[m]DCRRI3084.7[m]CCHYDRO3094.0[m]DCRRI3094.5[m]CCHYDRO3095.0[m]DCRRI3095.5[m]CCHYDRO3098.2[m]CCHYDRO3112.5[m]CCHYDRO3120.7[m]CCHYDRO3126.0[m]DCRRI3126.5[m]CCHYDRO3128.0[m]DCRRI3129.0[m]DCRRI3129.9[m]CCHYDRO3130.0[m]DCRRI3132.8[m]CCHYDRO3136.8[m]CCHYDRO3146.8[m]CCHYDRO