34/11-1
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General information
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Wellbore history
GeneralWell 34/11-1 was drilled on the Tjalve Terrace south-east of the Gullfaks Field in the northern North Sea. The main objective for the well was to explore the hydrocarbon potential of the Early-Middle Jurassic reservoirs within the Alpha structure, and to test the current geological model for the Alpha structure and the Gullfaks Gamma complex.Operations and resultsWildcat well 34/11-1 was spudded with the semi-submersible installation Ross Rig on 7 July 1994 and drilled to TD at 4580 m in Early Jurassic, possibly Late Triassic sediments of the Statfjord Formation. No significant problem was encountered in the drilling phase. Due to fish in the hole logs were not run below 2563 m. The well was drilled with bentonite/CMC EHV mud down to 1110 m, with ANCO 2000 mud with 3.2 - 4.4 % ANCO 208 glycols from 1110 m to 3932 m, and with ANCO THERM mud from 3932 m to TD.The top of the Brent Group was penetrated at 4045 m, 18 m lower than prognosed and proved to be gas/condensate bearing. A true gas-water contact was found at 4163 m at the base of the Ness Formation. Both the Cook and the Statfjord Formations were water bearing. First trace of fluorescence in the well was reported in minor sandstones in the Lista Formation at 2115 m. Traces of light coloured fluorescence was observed sporadically on limestone down to top Brent Group, generally associated with elevated drill gas readings. At 3605 "oil film on shakers" was reported.A total of 131 m core was recovered in 12 cores in the Brent Group from 4054 m to 4220 m. The core depths were from 1 to 4 m shallow compared to the logger's depth. Segregated FMT samples were collected at 4142 m in the Ness Formation and in the Tarbert Formation at 4059.5 m.The well was permanently abandoned on 25 October 1994 as a gas/condensate discovery.TestingA single drill stem test was performed in the Ness Formation across the interval 4116.5 - 4137 m and produced 664221 Sm3/day of gas (gravity 0.690 rel. to air) and 387 Sm3/day of oil (gravity 794 kg/m3 at 20 deg C). The GOR was 1728 Sm3/Sm3. The gas contained 1% CO2 and 3 ppm H2S. The maximum temperature measured down-hole at the gauge was 152 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]1120.004578.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom14050.04060.2[m ]24060.24062.8[m ]34074.04079.4[m ]44080.04090.0[m ]54093.04104.5[m ]64106.04111.8[m ]74113.04122.5[m ]84125.04136.0[m ]94141.54154.2[m ]104156.54163.1[m ]114168.04189.6[m ]124193.04220.3[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]134.1Cores 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 availableDSTDST14114.004093.50CONDENSATE11.10.1994 - 03:30YES -
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 typeCONDUCTOR30276.036276.00.00LOTSURF.COND.261098.0201110.01.61LOTINTERM.13 3/83508.017 1/23520.02.00LOTINTERM.9 5/83925.012 1/23932.02.15LOTLINER74484.08 3/84580.00.00LOT -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.04117413712.7Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.040.00067.00069Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.03876642210.7940.6901728 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL VDL CCL GR37004404CCL1454090DIFL MAC ZDL CNL DSL CHT39224558DLL MLL TBRT GR CHT40154558FMT QDYN GR CHT40454050FMT QDYN GR CHT40494524HRDIP GR CHT39304557MWD2704577VSP19004400ZDL CN DSL CHT39224565 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit215985995103813121365140714471488158016191650189218921942195021252125241532003503375037503895390539173917399640454045406041644177422142214289433843954514 -
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]pdf30.10 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured17531.4028.010.0WATER BASED18.07.199420201.4021.011.5WATER BASED20.07.199420201.4025.014.0WATER BASED20.07.199420201.4024.012.5WATER BASED21.07.199421151.4025.013.5WATER BASED18.07.199421581.4023.011.0WATER BASED18.07.199421701.4021.011.5WATER BASED20.07.199423671.4025.014.0WATER BASED20.07.199425401.4024.012.5WATER BASED21.07.199427301.4029.010.5WATER BASED22.07.199428721.4022.010.5WATER BASED25.07.199428721.4022.010.5WATER BASED25.07.199428881.5030.010.0WATER BASED25.07.199428881.5030.010.0WATER BASED25.07.199429351.5027.010.0WATER BASED25.07.199429351.5027.010.0WATER BASED25.07.199430321.5028.010.5WATER BASED26.07.199431111.5029.010.0WATER BASED27.07.199431541.5028.010.5WATER BASED28.07.199431681.5032.010.5WATER BASED01.08.199432401.5026.010.0WATER BASED01.08.199433081.5029.012.0WATER BASED01.08.199433711.5028.010.0WATER BASED01.08.199433891.5029.011.0WATER BASED03.08.199434521.5029.011.5WATER BASED03.08.199435151.5031.012.0WATER BASED08.08.199435201.5531.011.5WATER BASED09.08.199435201.5531.010.5WATER BASED09.08.199435201.5531.010.5WATER BASED09.08.199435291.8030.011.5WATER BASED09.08.199436661.8043.014.0WATER BASED11.08.199437451.8542.015.0WATER BASED11.08.199439071.8546.014.5WATER BASED15.08.199439321.8544.013.0WATER BASED18.08.199439321.8546.014.5WATER BASED16.08.199439321.8542.013.0WATER BASED16.08.199439321.8543.013.0WATER BASED17.08.199439351.8544.013.0WATER BASED22.08.199439942.0154.07.5DUMMY22.08.199440332.0135.05.0DUMMY22.08.199440451.9838.05.0DUMMY24.08.199440451.9837.06.0DUMMY24.08.199440451.9836.04.5DUMMY25.08.199440451.9836.04.5DUMMY26.08.199440451.9838.06.0DUMMY29.08.199440451.9838.05.5DUMMY30.08.199440451.9841.06.0DUMMY31.08.199440451.9840.06.0DUMMY01.09.199440451.9843.06.0DUMMY05.09.199440451.9840.05.5DUMMY05.09.199440451.9841.06.0DUMMY05.09.199440451.9839.06.0DUMMY05.09.199440451.9842.06.0DUMMY07.09.199440451.9838.05.0DUMMY07.09.199440451.9842.06.5DUMMY08.09.199440451.9843.08.0DUMMY12.09.199440451.9840.07.0DUMMY12.09.199440451.9840.05.5DUMMY12.09.199440451.9834.04.5DUMMY12.09.199440451.9837.06.0DUMMY14.09.199440451.9835.06.5DUMMY15.09.199440451.9838.07.0DUMMY16.09.199440451.9838.05.0DUMMY29.08.199440451.9837.05.5DUMMY26.09.199440451.9837.06.0DUMMY27.09.199440451.9835.05.0DUMMY29.09.199440451.9835.06.0DUMMY19.09.199440451.9837.05.0DUMMY20.09.199440451.9863.013.5DUMMY21.09.199440451.9842.06.0DUMMY26.09.199440451.9840.06.0DUMMY26.09.199440451.9842.05.0DUMMY26.09.199440451.9836.06.0DUMMY14.09.199440451.9836.05.0DUMMY30.09.199440451.9840.06.0DUMMY19.09.199440451.9837.06.5DUMMY28.09.199440542.0138.06.0DUMMY22.08.199440571.9838.05.0DUMMY24.08.199440681.9837.06.0DUMMY24.08.199440741.9836.04.5DUMMY25.08.199440801.9836.04.5DUMMY26.08.199441061.9838.05.0DUMMY29.08.199441061.9838.06.0DUMMY29.08.199441251.9838.05.5DUMMY30.08.199441300.0041.06.0DUMMY31.08.199441421.9840.06.0DUMMY01.09.199441571.9843.06.0DUMMY05.09.199441681.9840.05.5DUMMY05.09.199441841.9841.06.0DUMMY05.09.199441931.9839.06.0DUMMY05.09.199442201.9842.06.0DUMMY07.09.199442201.9838.05.0DUMMY07.09.199442561.9842.06.5DUMMY08.09.199442921.9835.05.0DUMMY29.09.199442921.9837.06.0DUMMY27.09.199442921.9837.05.5DUMMY26.09.199442921.9842.06.0DUMMY26.09.199442921.9842.05.0DUMMY26.09.199442921.9837.05.0DUMMY20.09.199442921.9863.013.5DUMMY21.09.199442921.9840.06.0DUMMY26.09.199442921.9837.06.5DUMMY28.09.199442921.9836.05.0DUMMY30.09.199442961.9843.08.0DUMMY12.09.199443521.9840.07.0DUMMY12.09.199443681.9840.05.5DUMMY12.09.199443761.9834.04.5DUMMY12.09.199444601.9836.06.0DUMMY14.09.199445001.9837.06.0DUMMY14.09.199445111.9835.06.5DUMMY15.09.199445801.9836.05.0DUMMY30.09.199445801.9837.05.5DUMMY26.09.199445801.9835.05.0DUMMY29.09.199445801.9863.013.5DUMMY21.09.199445801.9837.05.0DUMMY20.09.199445801.9835.06.0DUMMY19.09.199445801.9840.06.0DUMMY19.09.199445801.9842.05.0DUMMY26.09.199445801.9840.06.0DUMMY26.09.199445801.9842.06.0DUMMY26.09.199445801.9837.06.0DUMMY27.09.199445801.9837.06.5DUMMY28.09.199445801.9838.07.0DUMMY16.09.1994 -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory1120.0[m]DCGEOST1140.0[m]DCGEOST1150.0[m]DCGEOST1170.0[m]DCGEOST1180.0[m]DCGEOST1200.0[m]DCGEOST1210.0[m]DCGEOST1230.0[m]DCGEOST1240.0[m]DCGEOST1260.0[m]DCGEOST1270.0[m]DCGEOST1290.0[m]DCGEOST1300.0[m]DCGEOST1320.0[m]DCGEOST1330.0[m]DCGEOST1350.0[m]DCGEOST1360.0[m]DCGEOST1380.0[m]DCGEOST1390.0[m]DCGEOST1410.0[m]DCGEOST1420.0[m]DCGEOST1440.0[m]DCGEOST1450.0[m]DCGEOST1470.0[m]DCGEOST1480.0[m]DCGEOST1500.0[m]DCGEOST1510.0[m]DCGEOST1530.0[m]DCGEOST1540.0[m]DCGEOST1560.0[m]DCGEOST1570.0[m]DCGEOST1590.0[m]DCGEOST1600.0[m]DCGEOST1620.0[m]DCGEOST1630.0[m]DCGEOST1650.0[m]DCGEOST1660.0[m]DCGEOST1680.0[m]DCGEOST1690.0[m]DCGEOST1710.0[m]DCGEOST1720.0[m]DCGEOST1740.0[m]DCGEOST1750.0[m]DCGEOST1770.0[m]DCGEOST1780.0[m]DCGEOST1800.0[m]DCGEOST1810.0[m]DCGEOST1830.0[m]DCGEOST1840.0[m]DCGEOST1860.0[m]DCGEOST1870.0[m]DCGEOST1890.0[m]DCGEOST1900.0[m]DCGEOST1920.0[m]DCGEOST1930.0[m]DCGEOST1950.0[m]DCGEOST1965.0[m]DCGEOST1980.0[m]DCGEOST1995.0[m]DCGEOST2010.0[m]DCGEOST2025.0[m]DCGEOST2043.0[m]DCGEOST2055.0[m]DCGEOST2070.0[m]DCGEOST2085.0[m]DCGEOST2100.0[m]DCGEOST2115.0[m]DCGEOST2130.0[m]DCGEOST2145.0[m]DCGEOST2160.0[m]DCGEOST2180.0[m]DCGEOST2200.0[m]DCGEOST2210.0[m]DCGEOST2230.0[m]DCGEOST2240.0[m]DCGEOST2260.0[m]DCGEOST2270.0[m]DCGEOST2290.0[m]DCGEOST2300.0[m]DCGEOST2320.0[m]DCGEOST2330.0[m]DCGEOST2350.0[m]DCGEOST2360.0[m]DCGEOST2380.0[m]DCGEOST2390.0[m]DCGEOST2410.0[m]DCGEOST2420.0[m]DCGEOST2440.0[m]DCGEOST2450.0[m]DCGEOST2470.0[m]DCGEOST2480.0[m]DCGEOST2500.0[m]DCGEOST2510.0[m]DCGEOST2530.0[m]DCGEOST2540.0[m]DCGEOST2560.0[m]DCGEOST2570.0[m]DCGEOST2590.0[m]DCGEOST2600.0[m]DCGEOST2620.0[m]DCGEOST2630.0[m]DCGEOST2650.0[m]DCGEOST2660.0[m]DCGEOST2680.0[m]DCGEOST2690.0[m]DCGEOST2710.0[m]DCGEOST2720.0[m]DCGEOST2740.0[m]DCGEOST2750.0[m]DCGEOST2770.0[m]DCGEOST2780.0[m]DCGEOST2800.0[m]DCGEOST2810.0[m]DCGEOST2830.0[m]DCGEOST2850.0[m]DCGEOST2860.0[m]DCGEOST2870.0[m]DCGEOST2890.0[m]DCGEOST2900.0[m]DCGEOST2920.0[m]DCGEOST2930.0[m]DCGEOST2950.0[m]DCGEOST2960.0[m]DCGEOST2980.0[m]DCGEOST2990.0[m]DCGEOST3010.0[m]DCGEOST3020.0[m]DCGEOST3040.0[m]DCGEOST3050.0[m]DCGEOST3060.0[m]DCGEOST3070.0[m]DCGEOST3090.0[m]DCGEOST3100.0[m]DCGEOST3120.0[m]DCGEOST3130.0[m]DCGEOST3150.0[m]DCGEOST3160.0[m]DCGEOST3180.0[m]DCGEOST3190.0[m]DCGEOST3210.0[m]DCGEOST3220.0[m]DCGEOST3240.0[m]DCGEOST3250.0[m]DCGEOST3270.0[m]DCGEOST3280.0[m]DCGEOST3300.0[m]DCGEOST3310.0[m]DCGEOST3330.0[m]DCGEOST3340.0[m]DCGEOST3360.0[m]DCGEOST3370.0[m]DCGEOST3390.0[m]DCGEOST3400.0[m]DCGEOST3420.0[m]DCGEOST3430.0[m]DCGEOST3450.0[m]DCGEOST3460.0[m]DCGEOST3480.0[m]DCGEOST3490.0[m]DCGEOST3510.0[m]DCGEOST3520.0[m]DCGEOST3530.0[m]DCGEOST3545.0[m]DCGEOST3560.0[m]DCGEOST3575.0[m]DCGEOST3590.0[m]DCGEOST3606.0[m]DCGEOST3621.0[m]DCGEOST3636.0[m]DCGEOST3651.0[m]DCGEOST3663.0[m]DCGEOST3680.0[m]DCGEOST3695.0[m]DCGEOST3710.0[m]DCGEOST3725.0[m]DCGEOST3740.0[m]DCGEOST3755.0[m]DCGEOST3770.0[m]DCGEOST3785.0[m]DCGEOST3800.0[m]DCGEOST3815.0[m]DCGEOST3830.0[m]DCGEOST3845.0[m]DCGEOST3860.0[m]DCGEOST3875.0[m]DCGEOST3890.0[m]DCGEOST3905.0[m]DCGEOST3920.0[m]DCGEOST3932.0[m]DCGEOST3935.0[m]DCGEOST3944.0[m]DCGEOST3953.0[m]DCGEOST3962.0[m]DCGEOST3971.0[m]DCGEOST3980.0[m]DCGEOST3989.0[m]DCGEOST3998.0[m]DCGEOST4007.0[m]DCGEOST4016.0[m]DCGEOST4025.0[m]DCGEOST4034.0[m]DCGEOST4043.0[m]DCGEOST4056.0[m]CRRI4057.0[m]CRRI4059.0[m]CRRI4059.0[m]CGEOST4060.0[m]CRRI4061.0[m]CGEOST4061.0[m]CRRI4062.0[m]CRRI4074.0[m]CGEOST4074.0[m]CRRI4077.0[m]CRRI4078.0[m]CRRI4079.0[m]CGEOST4079.0[m]CRRI4080.0[m]CRRI4084.0[m]CRRI4085.0[m]CGEOST4085.0[m]CRRI4086.0[m]CRRI4088.0[m]CRRI4088.0[m]CGEOST4089.0[m]CRRI4093.0[m]CRRI4094.0[m]CRRI4095.0[m]CGEOST4096.0[m]CRRI4097.0[m]CRRI4099.0[m]CRRI4099.0[m]CGEOST4101.0[m]CRRI4102.0[m]CRRI4103.0[m]CGEOST4103.0[m]CRRI4106.0[m]CRRI4109.0[m]CRRI4110.0[m]CRRI4111.0[m]CRRI4111.0[m]CGEOST4113.0[m]CRRI4114.0[m]CRRI4114.0[m]CGEOST4119.0[m]CGEOST4120.0[m]CRRI4122.0[m]CGEOST4127.0[m]CGEOST4127.0[m]CRRI4133.0[m]CGEOST4134.0[m]CRRI4135.0[m]CGEOST4143.0[m]CRRI4144.0[m]CGEOST4144.0[m]CRRI4147.0[m]CRRI4148.0[m]CGEOST4148.0[m]CRRI4150.0[m]CRRI4152.0[m]CRRI4154.0[m]CRRI4154.0[m]CGEOST4156.0[m]CRRI4158.0[m]CRRI4159.0[m]CRRI4159.0[m]CGEOST4160.0[m]CRRI4168.0[m]CGEOST4172.0[m]CGEOST4176.0[m]CGEOST4183.0[m]CGEOST4189.0[m]CGEOST4195.0[m]CGEOST4197.0[m]CGEOST4205.0[m]CGEOST4206.0[m]CRRI4210.0[m]CGEOST4211.0[m]CGEOST4211.0[m]CRRI4213.0[m]CRRI4214.0[m]CRRI4215.0[m]CGEOST4215.0[m]CRRI4216.0[m]CRRI4217.0[m]CRRI4218.0[m]CGEOST4218.0[m]CRRI4219.0[m]CRRI4220.0[m]CRRI4220.0[m]CGEOST4230.0[m]DCGEOST4239.0[m]DCGEOST4248.0[m]DCGEOST4257.0[m]DCGEOST4266.0[m]DCGEOST4275.0[m]DCGEOST4284.0[m]DCGEOST4293.0[m]DCGEOST4302.0[m]DCGEOST4311.0[m]DCGEOST4320.0[m]DCGEOST4329.0[m]DCGEOST4338.0[m]DCGEOST4347.0[m]DCGEOST4356.0[m]DCGEOST4365.0[m]DCGEOST4374.0[m]DCGEOST4383.0[m]DCGEOST4392.0[m]DCGEOST4401.0[m]DCGEOST4410.0[m]DCGEOST4419.0[m]DCGEOST4428.0[m]DCGEOST4437.0[m]DCGEOST4446.0[m]DCGEOST4455.0[m]DCGEOST4464.0[m]DCGEOST4473.0[m]DCGEOST4482.0[m]DCGEOST4491.0[m]DCGEOST4500.0[m]DCGEOST4509.0[m]DCGEOST4518.0[m]DCGEOST4527.0[m]DCGEOST4536.0[m]DCGEOST4542.0[m]DCGEOST4554.0[m]DCGEOST4563.0[m]DCGEOST4572.0[m]DCGEOST4578.0[m]DCGEOST 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Thin sections at the Norwegian Offshore Directorate
Thin sections at the Norwegian Offshore Directorate DepthUnit4099.64[m ]4117.77[m ]4129.75[m ]4158.10[m ]4161.56[m ]4162.80[m ]4169.50[m ]4170.75[m ]4172.05[m ]4175.00[m ]4182.80[m ]4197.80[m ]4205.80[m ]4212.79[m ]4054.30[m ]4056.90[m ]4058.70[m ]4074.49[m ]4081.72[m ]