30/2-2
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General information
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Wellbore history
GeneralWell 30/2-2 was drilled on the Mokkukalven Fault Complex north of the Oseberg Field in the North Sea. The objective was to test possible hydrocarbon accumulations in the Huldra Field, on a structural high that is separated from Huldra discovery well 30/2-1 with significant faults. Well 30/2-1 encountered a 119 m gas column in the Brent Group with a down-to contact at 3793 m. The actual gas/water or oil/water contact could not be established. The main target for 30/2-2 was the Brent Group, believed to be some 70 m deeper than the gas column in 30/2-1.Operations and resultsAppraisal well 30/2-2 was spudded with the semi-submersible installation Dyvi Delta on 19 December 1984 and drilled to TD at 4172 m in the Early Jurassic Drake Formation. When doing the reservoir logging, a radioactive part of the logging tool was left in the hole. This accident caused a sidetrack from 3894 m KB to TD. The sidetrack ran parallel to the original hole at a distance of approximately 20 m. The intention was to drill 50 m into the Statfjord Formation, but the well was finished in the Drake Formation due to hole conditions. The well was drilled with spud mud down to 214 m, with gel/seawater from 214 m to 1023 m, with gypsum/CMC mud from 1023 m to 3802 m, and with gel/lignosulphonate from 3802 m to TD.Gas bearing Brent sandstone was encountered at 3935 m, with the gas-water contact somewhere in the interval 3975 - 4080 m. No distinct contact was possible to recognize from logs or shows, but later geochemical analyses of the corers indicated a contact at ca 3984 m. Fluorescence indicating shows was first recorded on claystone/limestone cuttings in the interval 2204 m to 2267 m in the Lista Formation. Intermittent golden cut was observed on cuttings samples in the interval 2489 m to 2585 m in the Shetland Group. Otherwise, oil/condensate shows were recorded on sandstones from the Brent Group through the hydrocarbon-bearing reservoir. Below the contact, weak shows believed to relate to in-situ kerogen in coals and shales were recorded down to TD.A total of 157 m conventional core was recovered in eighteen cores in the interval from 3908 m in the lower Heather Formation, through all of Brent Group and down to 4139.1 m in the uppermost Drake Formation. All cores were cut in the original hole, before side-tracking. Log runs 1 to 5 were also run in the original hole, while run 6 and 7 were run in the sidetrack. No wire line fluid samples were taken.The well was permanently abandoned on 4 May 1985 as a gas appraisal well.TestingThree drill stem tests were conducted in the Brent Group.DST 1B tested the interval 4071 - 4076 m in the Etive Formation. The test flowed water at only five m3/day through a 19.05 mm choke during a 7.07 hours flow period. The maximum temperature reading was 150 °C. DST 1A failed due to technical problems.DST 2B tested the intervals 4011-4013 m, 4017-4025 m, and 4035 - 4042 m in the Ness Formation. The test flowed water at only eight m3/day through a 19.05 mm choke during a 13.5 hours flow period. The maximum temperature reading was 148 °C. DST 2A failed due to technical problems.DST 3 tested the intervals 3935 - 3949 m, 3955 – 3959 m, and 3967-3974 m in the Tarbert Formation. It produced 227600 Sm3 gas and 105 Sm3 condensate /day through a 19.05 mm choke. The GOR was 2170 Sm3/Sm3. The maximum temperature reading was 137 °C. -
Cuttings at the Norwegian Offshore Directorate
Cuttings at the Norwegian Offshore Directorate Cuttings available for sampling?NOCuttings at the Norwegian Offshore Directorate Cutting sample, top depth [m]Cutting samples, bottom depth [m]220.004172.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom13908.03912.5[m ]23939.03957.3[m ]33957.33965.8[m ]43966.03979.8[m ]53979.83987.6[m ]63987.83989.6[m ]73989.63993.5[m ]83993.53997.5[m ]94014.04025.6[m ]104026.04027.9[m ]114029.04031.6[m ]124031.84047.7[m ]134047.74048.9[m ]144048.94052.5[m ]154076.04093.8[m ]164094.04112.3[m ]174112.34130.3[m ]184130.54135.5[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]158.4Cores 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 typeLaboratory2000.0[m]CGEOST2018.0[m]CGEOST2030.0[m]CGEOST2048.0[m]CGEOST2060.0[m]CGEOST2078.0[m]CGEOST2090.0[m]CGEOST2108.0[m]CGEOST2120.0[m]CGEOST2138.0[m]CGEOST2150.0[m]CGEOST2168.0[m]CGEOST2180.0[m]CGEOST2198.0[m]CGEOST2210.0[m]CGEOST2228.0[m]CGEOST2240.0[m]CGEOST2264.0[m]CGEOST2270.0[m]CGEOST2288.0[m]CGEOST2300.0[m]CGEOST2318.0[m]CGEOST2330.0[m]CGEOST2348.0[m]CGEOST2360.0[m]CGEOST2378.0[m]CGEOST2390.0[m]CGEOST2408.0[m]CGEOST2420.0[m]CGEOST2438.0[m]CGEOST2450.0[m]CGEOST2468.0[m]CGEOST2480.0[m]CGEOST2496.0[m]CGEOST2518.0[m]CGEOST2528.0[m]CGEOST2542.0[m]CGEOST2558.0[m]CGOEST2570.0[m]CGEOST2585.0[m]CGEOST2600.0[m]CGEOST2618.0[m]CGEOST2630.0[m]CGEOST2648.0[m]CGEOST2660.0[m]CGEOST2678.0[m]CGEOST2690.0[m]CGEOST2708.0[m]CGEOST2720.0[m]DCGEOST2738.0[m]CGEOST2750.0[m]CGEOST2753.0[m]CGEOST2768.0[m]CGEOST2780.0[m]CGEOST2798.0[m]CGEOST2810.0[m]CGEOST2828.0[m]CGEOST2840.0[m]CGEOST2858.0[m]CGEOST2870.0[m]CGEOST2888.0[m]CGEOST2900.0[m]CGEOST2918.0[m]CGEOST2930.0[m]CGEOST2948.0[m]CGEOST2960.0[m]DCGEOST2978.0[m]CGEOST2990.0[m]CGEOST3008.0[m]CGEOST3020.0[m]CGEOST3038.0[m]CGEOST3068.0[m]CGEOST3080.0[m]CGEOST3098.0[m]CGEOST3110.0[m]CGEOST3128.0[m]CGEOST3140.0[m]CGEOST3158.0[m]CGEOST3170.0[m]CGEOST3188.0[m]CGEOST3200.0[m]CGEOST3230.0[m]CGEOST3248.0[m]CGEOST3260.0[m]CGEOST3278.0[m]CGEOST3290.0[m]CGEOST3308.0[m]CGEOST3320.0[m]CGEOST3338.0[m]CGEOST3350.0[m]CGEOST3368.0[m]CGEOST3380.0[m]CGEOST3398.0[m]CGEOST3410.0[m]CGEOST3428.0[m]CGEOST3440.0[m]CGEOST3458.0[m]CGEOST3470.0[m]CGEOST3488.0[m]CGEOST3500.0[m]CGEOST3518.0[m]CGEOST3530.0[m]CGEOST3548.0[m]CGEOST3560.0[m]CGEOST3578.0[m]CGEOST3590.0[m]CGEOST3608.0[m]CGEOST3620.0[m]CGEOST3638.0[m]CGEOST3650.0[m]CGEOST3668.0[m]CGEOST3680.0[m]CGEOST3698.0[m]CGEOST3710.0[m]CGEOST3728.0[m]CGEOST3740.0[m]CGEOST3758.0[m]CGEOST3761.0[m]CGEOST3770.0[m]CGEOST3788.0[m]CGEOST3800.0[m]CGEOST3818.0[m]CGEOST3830.0[m]CGEOST3839.0[m]CGEOST3848.0[m]CGEOST3860.0[m]CGEOST3869.0[m]CGEOST3878.0[m]CGEOST3890.0[m]CGEOST3899.0[m]CGEOST3908.0[m]CGEOST3920.0[m]CGEOST3938.0[m]CGEOST3940.0[m]CGEOST3944.0[m]SWCGEOST3950.0[m]DCGEOST3953.0[m]CGEOST3956.0[m]CGEOST3956.0[m]DCGEOST3964.0[m]CGEOST3968.0[m]DCGEOST3970.0[m]CGEOST3975.0[m]CGEOST3976.0[m]CGEOST3977.0[m]DCGEOST3978.0[m]CGEOST3980.0[m]DCGEOST3980.0[m]CGEOST3983.0[m]CGEOST3985.0[m]DCGEOST3990.0[m]DCGEOST3994.0[m]DCGEOST3995.0[m]SWCGEOST3998.0[m]DCGEOST4004.0[m]SWCGEOST4010.0[m]DCGEOST4014.0[m]CGEOST4018.0[m]CGEOST4024.0[m]CGEOST4027.0[m]CGEOST4028.0[m]DCGEOST4029.0[m]DCGEOST4030.0[m]CGEOST4036.0[m]CGEOST4040.0[m]DCGEOST4040.0[m]CGEOST4043.0[m]CGEOST4044.0[m]DCGEOST4046.0[m]DCGEOST4047.0[m]DCGEOST4048.0[m]DCGEOST4048.0[m]CGEOST4049.0[m]CGEOST4051.0[m]DCGEOST4051.0[m]CGEOST4052.0[m]CGEOST4058.0[m]DCGEOST4061.0[m]SWCGEOST4070.0[m]SWCGEOST4070.0[m]DCGEOST4079.0[m]SWCGEOST4088.0[m]DCGEOST4089.0[m]CGEOST4093.0[m]DCGEOST4093.0[m]CGEOST4095.0[m]DCGEOST4096.0[m]DCGEOST4097.0[m]CGEOST4098.0[m]CGEOST4100.0[m]DCGEOST4106.0[m]SWCGEOST4115.0[m]SWCGEOST4118.0[m]SWCGEOST4118.0[m]DCGEOST4126.0[m]DCGEOST4128.0[m]CGEOST4130.0[m]DCGEOST4132.0[m]CGEOST4134.0[m]CGEOST4135.0[m]DCGEOST4148.0[m]DCGEOST4160.0[m]DCGEOST4172.0[m]DCGEOST -
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 availableDSTTEST33935.003974.0023.04.1985 - 00:00YES -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit1527838928921967196720412063222422242533344236793702370237763776382439353935395940704075409841354135 -
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]pdf5.09pdf29.56 -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.04071407619.12.04011404219.13.03935397419.1Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.02.03.0Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.02.03.01052260000.8080.7342160 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL7222345CBL24253788CBL36004127CDL CNS GR2144163DIL BCS CAL GR2144164DLL MSF GR10062718FED23452716NGT36654175SFT39374100VELOCITY8004125 -
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 typeCONDUCTOR30214.536214.50.00LOTSURF.COND.201008.0261023.01.61LOTINTERM.13 3/82350.017 1/22365.02.03LOTINTERM.9 5/83778.012 1/43802.02.14LOTLINER74170.08 1/24170.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured16701.119.07.3WATERBASED04.01.198516701.119.07.3WATER BASED04.01.198518701.259.010.0WATER BASED07.01.198518701.259.010.0WATERBASED07.01.198519781.3510.013.0WATER BASED07.01.198519781.3510.013.0WATERBASED07.01.198521221.4515.015.2WATER BASED07.01.198521221.4515.015.2WATERBASED07.01.198522581.4516.08.3WATERBASED07.01.198522581.4516.08.3WATER BASED07.01.198523651.5016.08.4WATER BASED09.01.198523651.5317.08.9WATER BASED09.01.198523651.5516.07.0WATER BASED14.01.198523651.5016.08.4WATERBASED09.01.198523650.0017.08.9WATERBASED09.01.198523650.0016.07.0WATERBASED14.01.198524721.5518.07.4WATERBASED14.01.198524721.5518.07.4WATER BASED14.01.198525331.6020.07.9WATER BASED15.01.198525331.6020.07.9WATERBASED15.01.198525561.7021.07.4WATERBASED15.01.198525561.7021.07.4WATER BASED15.01.198526051.7022.07.9WATER BASED16.01.198526051.7022.07.9WATERBASED16.01.198526191.7322.07.4WATER BASED16.01.198526191.7322.07.4WATERBASED16.01.198527041.7722.07.0WATERBASED17.01.198527041.7722.07.0WATER BASED17.01.198528021.7519.07.0WATER BASED18.01.198528021.7519.07.0WATERBASED18.01.198529091.7822.08.0WATERBASED21.01.198529091.7822.08.0WATER BASED21.01.198529801.7922.08.0WATERBASED28.01.198529801.7922.08.0WATER BASED28.01.198538021.8222.06.0WATERBASED11.02.198538021.8222.06.0WATER BASED11.02.198538841.9125.08.0WATER BASED18.02.198538841.9125.08.0WATERBASED18.02.198539381.9635.08.0WATER BASED01.04.198539381.9635.08.0WATERBASED01.04.198539501.9635.08.0WATERBASED01.04.198539501.9635.08.0WATER BASED01.04.198540131.9426.08.8WATERBASED26.02.198540131.9426.08.8WATER BASED26.02.198540191.9635.08.0WATER BASED01.04.198540191.9635.08.0WATERBASED01.04.198541001.9635.08.0WATERBASED01.04.198541001.9635.08.0WATER BASED01.04.198541721.9635.08.4WATER BASED26.03.198541721.9635.08.4WATERBASED26.03.198541741.9426.08.8WATER BASED06.03.198541741.9426.08.8WATERBASED06.03.1985 -
Thin sections at the Norwegian Offshore Directorate
Thin sections at the Norwegian Offshore Directorate DepthUnit4134.68[m ]4132.38[m ]4124.70[m ]4106.35[m ]4106.02[m ]4098.90[m ]4093.30[m ]4089.65[m ]4086.65[m ]4082.65[m ]4078.65[m ]4040.25[m ]4020.73[m ]3984.42[m ]3973.67[m ]3968.45[m ]4116.65[m ]3963.74[m ]3957.82[m ]3955.70[m ]3951.45[m ]3944.90[m ]3939.95[m ]4022.30[m ]3945.00[m ]4102.00[m ]3974.90[m ]3949.40[m ]4042.90[m ]4079.40[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]pdf0.21