34/10-36
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General information
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Wellbore history
GeneralWell 34/10-36 was the sixth well drilled on the Gullfaks Sør structure. The objectives were to test the potential of Intra-Draupne Formation turbiditic sandstone, and to confirm the gas-oil contact, the oil-water contact, and the pressure regime in the Brent Group.Operations and resultsAppraisal well 34/10-36 was spudded with the semi-submersible installation Deepsea Bergen on 28 April 1992 and drilled to TD at 3640 m in the Early Jurassic Cook Formation. A 9 7/8” pilot hole was drilled from surface to 859 m to check for shallow gas. The MWD indicated several sands but all were water-filled. The well was drilled with seawater and CMC down to 1071 m, with gypsum/polymer mud from 1071 m to 3010 m, and with Ancotemp/bentonite from 3010 m to TD.The Draupne Formation consisted of shale with only traces of sandstone stringers towards the base. The Brent Group, Tarbert Formation was encountered at 3361 m (3355.3 m TVD), 55 m deeper than prognosed. It was oil-bearing down to the OWC at 3377.5 m (3371.9 m TVD). Shows were seen down to 3397 m. The GOC was not penetrated in the well location.Three cores were cut in the well. Core 1 was cut from 3029 to 3054 m in the Draupne Formation. Cores 2 and 3 were cut in the Tarbert Formation from 3363 m to 3417 m. The core shifts for cores 1, 2 and 3 were 3.0 m, 2.3 m and 2.3 m, respectively. One segregated sample was taken at 3363.8 m. The 2 3/4 gallon chamber contained 3.5 litres of oil, 3.5 litres of mud filtrate and 0.22 m3 gas. No CO2 or H2S was detected from this sample chamber.The well was permanently abandoned on 13 July 1992 as an oil appraisal well.TestingOne drill stem test was performed in the Tarbert Formation, from the interval 3371.2 - 3376.2 m. The well flowed 836 Sm3 oil and 161490 Sm3 gas /day through a 36/64” choke. The GOR was 193 Sm3/Sm3, the oil density was 0.869 g/cm3 and the gas density was 0.695 with 2 % CO2 and 3.5 ppm H2S. The recorded temperature was 126.1 °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]1080.003640.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom13029.03053.0[m ]23363.03390.0[m ]33390.03417.0[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]78.0Cores 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 availableDSTTEST13371.203373.2028.06.1992 - 15:00YES -
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 typeCONDUCTOR30220.036222.00.00LOTINTERM.201056.0261058.01.60LOTINTERM.13 3/82100.017 1/22103.01.76LOTLINER72838.08 1/23625.00.00LOTINTERM.9 5/82994.012 1/42997.01.97LOT -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.03371014.3Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.014.000Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.08361614900.8610.685194 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL VDL GR8253574CORGUN30553634DIFL ACL GR10562087DIFL ACL GR CAL20973637DIP32153637DLL MLL GR29933637FMT GR31313553MWD1593640VSP1393570ZDL CNL GR29933636 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit159931989184218421921195220492061206123492882299930263026312533613361344835113524355535553565 -
Geochemical information
Geochemical information Document nameDocument formatDocument size [MB]pdf0.55pdf0.60pdf1.23pdf1.79pdf0.28 -
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]pdf2.10pdf21.90 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured8261.0310.0WATER BASED9471.0316.0WATER BASED11711.3020.0WATER BASED14451.3023.0WATER BASED17371.3025.0WATER BASED19181.3027.0WATER BASED20151.3026.0WATER BASED21151.3027.0WATER BASED22411.3527.0WATER BASED23501.3525.0WATER BASED23961.3927.0WATER BASED24511.3927.0WATER BASED26121.3928.0WATER BASED26611.3928.0WATER BASED27741.3929.0WATER BASED28251.4531.0WATER BASED28801.5032.0WATER BASED30101.5427.0WATER BASED30501.4726.0WATER BASED33591.5628.0WATER BASED33631.4722.0WATER BASED34261.4721.0WATER BASED35861.4721.0WATER BASED36401.5631.0WATER BASED -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory1080.0[m]DCGEOST1100.0[m]DCGEOST1120.0[m]DCGEOST1130.0[m]DCGEOST1150.0[m]DCGEOST1160.0[m]DCGEOST1180.0[m]DCGEOST1190.0[m]DCGEOST1210.0[m]DCGEOST1220.0[m]DCGEOST1240.0[m]DCGEOST1250.0[m]DCGEOST1270.0[m]DCGEOST1280.0[m]DCGEOST1300.0[m]DCGEOST1310.0[m]DCGEOST1330.0[m]DCGEOST1340.0[m]DCGEOST1360.0[m]DCGEOST1370.0[m]DCGEOST1390.0[m]DCGEOST1400.0[m]DCGEOST1420.0[m]DCGEOST1430.0[m]DCGEOST1450.0[m]DCGEOST1460.0[m]DCGEOST1480.0[m]DCGEOST1490.0[m]DCGEOST1510.0[m]DCGEOST1520.0[m]DCGEOST1540.0[m]DCGEOST1550.0[m]DCGEOST1570.0[m]DCGEOST1580.0[m]DCGEOST1600.0[m]DCGEOST1610.0[m]DCGEOST1630.0[m]DCGEOST1640.0[m]DCGEOST1660.0[m]DCGEOST1670.0[m]DCGEOST1690.0[m]DCGEOST1700.0[m]DCGEOST1720.0[m]DCGEOST1730.0[m]DCGEOST1750.0[m]DCGEOST1760.0[m]DCGEOST1780.0[m]DCGEOST1790.0[m]DCGEOST1809.0[m]DCGEOST1827.0[m]DCGEOST1839.0[m]DCGEOST1854.0[m]DCGEOST1869.0[m]DCGEOST1884.0[m]DCGEOST1899.0[m]DCGEOST1914.0[m]DCGEOST1926.0[m]DCGEOST1944.0[m]DCGEOST1959.0[m]DCGEOST1974.0[m]DCGEOST1986.0[m]DCGEOST2001.0[m]DCGEOST2019.0[m]DCGEOST2034.0[m]DCGEOST2049.0[m]DCGEOST2064.0[m]DCGEOST2079.0[m]DCGEOST2100.0[m]DCGEOST2130.0[m]DCGEOST2160.0[m]DCGEOST2190.0[m]DCGEOST2220.0[m]DCGEOST2250.0[m]DCGEOST2280.0[m]DCGEOST2310.0[m]DCGEOST2340.0[m]DCGEOST2370.0[m]DCGEOST2400.0[m]DCGEOST2430.0[m]DCGEOST2460.0[m]DCGEOST2490.0[m]DCGEOST2520.0[m]DCGEOST2550.0[m]DCGEOST2580.0[m]DCGEOST2610.0[m]DCGEOST2640.0[m]DCGEOST2670.0[m]DCGEOST2700.0[m]DCGEOST2730.0[m]DCGEOST2760.0[m]DCGEOST2790.0[m]DCGEOST2820.0[m]DCGEOST2850.0[m]DCGEOST2880.0[m]DCGEOST2909.0[m]DCGEOST2939.0[m]DCGEOST2969.0[m]DCGEOST2999.0[m]DCGEOST3005.0[m]DCGEOST3011.0[m]DCGEOST3017.0[m]DCGEOST3026.0[m]DCGEOST3029.0[m]CGEOST3033.0[m]CGEOST3038.0[m]CGEOST3042.0[m]CGEOST3045.9[m]CGEOST3050.0[m]CGEOST3053.3[m]CGEOST3055.0[m]SWCGEOST3060.0[m]SWCGEOST3070.0[m]SWCGEOST3080.0[m]DCGEOST3089.0[m]DCGEOST3110.0[m]SWCGEOST3115.0[m]SWCGEOST3120.0[m]SWCGEOST3125.0[m]SWCGEOST3130.0[m]SWCGEOST3140.0[m]SWCGEOST3150.0[m]CGEOST3160.0[m]SWCGEOST3171.0[m]SWCGEOST3185.0[m]SWCGEOST3194.0[m]DCGEOST3203.0[m]DCGEOST3212.5[m]SWCGEOST3221.0[m]DCGEOST3236.0[m]SWCGEOST3245.0[m]DCGEOST3257.0[m]DCGEOST3269.0[m]DCGEOST3281.0[m]DCGEOST3293.0[m]DCGEOST3305.0[m]DCGEOST3317.0[m]DCGEOST3331.0[m]SWCGEOST3341.0[m]DCGEOST3355.0[m]SWCGEOST3363.8[m]CGEOST3364.2[m]CGEOST3376.7[m]CGEOST3379.3[m]CGEOST3382.3[m]CGEOST3390.2[m]CGEOST3394.3[m]CGEOST3398.9[m]CGEOST3403.8[m]CGEOST3405.5[m]CGEOST3408.7[m]CGEOST3410.5[m]CGEOST3422.0[m]DCGEOST3431.0[m]DCGEOST3440.0[m]DCGEOST3449.0[m]DCGEOST3458.0[m]DCGEOST3467.0[m]DCGEOST3476.0[m]DCGEOST3485.0[m]DCGEOST3496.0[m]SWCGEOST3507.0[m]SWCGEOST3515.0[m]DCGEOST3524.0[m]SWCGEOST3533.0[m]DCGEOST3545.0[m]SWCGEOST3555.0[m]SWCGEOST3557.0[m]SWCGEOST3563.0[m]SWCGEOST3568.0[m]SWCGEOST3573.0[m]SWCGEOST3584.0[m]DCGEOST3596.0[m]DCGEOST3603.0[m]DCSTATO3610.0[m]SWCGEOST3620.0[m]DCGEOST3629.0[m]DCSTATO3635.0[m]DCSTATO3640.0[m]DCGEOST3640.0[m]DCSTATO