6506/11-4 S
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General information
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Wellbore history
GeneralWell 6506/11-4 S was drilled on the southern segment of the Smørbukk Discovery. The objectives of the well were to appraise the Smørbukk Discovery and to verify the planned production in the southern segment. The well was planned to be completed as a future producer.Operations and resultsWildcat well 6506/11-4 S was spudded with the semi-submersible installation Transocean Searcher on 11 February 1996 and drilled to TD at 5110 m (4887.5 m MSL) in Early Jurassic sediments of the Åre Formation. The hole was drilled to 4531 m in the Garn Formation and the 9 5/8" casing was set at planned depth, with casing shoe a few meters into the Garn Formation. However, during drilling out of casing, the new 8 1/2" bottom hole assembly was seized by late setting cement and got stuck inside casing. The well was side tracked with KOP at approximately 3144 m. The sidetrack is designated 6506/11-4 S T2. The sidetrack leg was drilled to the original target zone, the Åre Formation. The well was drilled with seawater and bentonite down to 1415 m, with KCl/polymer/Anco200 from 1415 m to 2825 m and with Ancovert oil based mud from 2825 m to TD.A Lange Formation sandstone unit was encountered from 4236 m to 4321 m. Well bore 6506/11-4 S T2 penetrated the top of the Tilje Formation and the Åre Formation approximately 24 m deeper than prognosed. Logs proved hydrocarbons in the Garn Formation, the Ile Formation and in the Åre 2 reservoir zone. The Tilje 1.1 Reservoir Zone was found to be water bearing. Hydrocarbons were further indicated by high resistivity log readings in the Lange Formation sandstone unit and in interbedded sandstones in the Lysing Formation from 3571 m to 3603 m.Two cores were cut in the first well bore, from 4260 m to 4299.9 m in the Lange Formation sandstone unit. A further six cores were cut from 4790 m to 5085.2 m in 6506/11-4 S T2. The latter cores covered the Early Jurassic from upper Tofte through Tilje, and 68.7 m into the Åre Formation. Oil shows were recorded in sandstones throughout both cored intervals. Further geochemical analyses of the oil shows were made difficult by the oil base used in the well. No sidewall cores were taken in this well. The Formation Multi Tester (FMT) was run for pressure and fluid sampling. One segregated fluid sample was taken at 4272.6 m in the Lange Formation; one was taken at 4588 m in the Garn Formation and one at 4702 m in the Ile Formation.The well is classified as an oil appraisal. It was completed on 6 June 1996 as a development well.TestingOne test, test 1 A, was carried out over the interval 5066 - 5073 m (Åre 1 Reservoir Zone) and proved to be tight. A second test, test 1 B, was carried out over the same interval plus interval 5039 - 5043 m (Åre 1 plus Åre 2 Reservoir Zone) and flowed with an oil rate of 726 SM3/day and a gas rate of 396500 Sm3/day gas. In reality this was a test of the Åre 2 reservoir zone. The bottom hole flowing temperature during the test was 163 deg C. A planned microfracture test was cancelled due to strike. -
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]3440.005110.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom14260.04270.5[m ]24272.04299.9[m ]34790.04826.0[m ]44826.04881.7[m ]54881.94937.5[m ]64937.55011.9[m ]75011.95030.8[m ]85030.85085.2[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]333.3Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
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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 typeCONDUCTOR30384.036385.00.00LOTSURF.COND.201401.0261402.01.68LOTINTERM.13 3/82810.017 1/22812.01.87LOTINTERM.9 5/84518.012 1/44520.00.00LOTLINER75109.08 1/25109.00.00LOT -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.05039507315.9Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.015.000163Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.07253950000.8000.738545 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]4ARM CAL GR28084502CBIL HDIP GR TTRM45104732CDL CN SLH TTRM45124748CDL CN SLH TTRM47085110DPIL MAC HDIL GR45125110DPIL MAC SL TTRM24004744DPIL MAC SLH TTRM24004250DPIL MAC ZDL CN SLH CHT40454510FMT GR CHT45224725FMT GR CHT45884702FMT GR CHT46855041FMT GR CHT46854908FMT GR CHT50155015FMT VPC GR28974319HDIP GR45105110MRIL GR45205100MWD - DPR3841415MWD - DPR TF431444520MWD - DPR2A28104516MWD - RGD3842825MWD - TRIPLE COMBO45125110VSP GR19755050ZDL CN GR TTRM34754282 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit32532514851943194322972297240024492449265228623500350036204399442844284434451245124611465847264726478248525022 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.59 -
Geochemical information
Geochemical information Document nameDocument formatDocument size [MB]pdf4.20 -
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]pdf37.10 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured14031.2022.0ANCO 200024001.6438.0ANCO 200028111.7359.0ANCO VERT28251.6437.0ANCO 200030601.7562.0ANCO VERT36581.7364.0ANCO VERT42721.7552.0ANCO VERT43381.7550.0ANCO VERT45201.2230.0ANCO VERT45311.3251.0ANCO VERT47011.2127.0ANCO VERT47451.2230.0ANCO VERT50341.2226.0ANCO VERT51101.2230.0ANCO VERT -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory3440.0[m]DCRRI3450.0[m]DCRRI3460.0[m]DCRRI3470.0[m]DCRRI3480.0[m]DCRRI3490.0[m]DCRRI3500.0[m]DCRRI3510.0[m]DCRRI3520.0[m]DCRRI3530.0[m]DCRRI3540.0[m]DCRRI3550.0[m]DCRRI3560.0[m]DCRRI3570.0[m]DCRRI3580.0[m]DCRRI3590.0[m]DCRRI3600.0[m]DCRRI3610.0[m]DCRRI3620.0[m]DCRRI3630.0[m]DCRRI3640.0[m]DCRRI3650.0[m]DCRRI3660.0[m]DCRRI3670.0[m]DCRRI3680.0[m]DCRRI3690.0[m]DCRRI3700.0[m]DCRRI3710.0[m]DCRRI3720.0[m]DCRRI3730.0[m]DCRRI3740.0[m]DCRRI3750.0[m]DCRRI3760.0[m]DCRRI3770.0[m]DCRRI3780.0[m]DCRRI3790.0[m]DCRRI3800.0[m]DCRRI3810.0[m]DCRRI3820.0[m]DCRRI3830.0[m]DCRRI3840.0[m]DCRRI3850.0[m]DCRRI3860.0[m]DCRRI3870.0[m]DCRRI3880.0[m]DCRRI3890.0[m]DCRRI3910.0[m]DCRRI3920.0[m]DCRRI3940.0[m]DCRRI3950.0[m]DCRRI3970.0[m]DCRRI3980.0[m]DCRRI3990.0[m]DCRRI4000.0[m]DCRRI4010.0[m]DCRRI4020.0[m]DCRRI4040.0[m]DCRRI4050.0[m]DCRRI4060.0[m]DCRRI4070.0[m]DCRRI4080.0[m]DCRRI4090.0[m]DCRRI4100.0[m]DCRRI4110.0[m]DCRRI4120.0[m]DCRRI4130.0[m]DCRRI4140.0[m]DCRRI4150.0[m]DCRRI4160.0[m]DCRRI4170.0[m]DCRRI4180.0[m]DCRRI4188.0[m]DCRRI4197.0[m]DCRRI4209.0[m]DCRRI4218.0[m]DCRRI4230.0[m]DCRRI4239.0[m]DCRRI4251.0[m]DCRRI4260.4[m]CWESTLB4262.9[m]CWESTLB4268.3[m]CWESTLB4273.2[m]CWESTLB4278.6[m]CWESTLB4282.9[m]CWESTLB4287.7[m]CWESTLB4288.9[m]CWESTLB4293.6[m]CWESTLB4298.8[m]CWESTLB4311.0[m]DCRRI4320.0[m]DCRRI4326.0[m]DCRRI4332.0[m]DCRRI4341.0[m]DCRRI4353.0[m]DCRRI4362.0[m]DCRRI4374.0[m]DCRRI4383.0[m]DCRRI4398.0[m]DCRRI4404.0[m]DCRRI4416.0[m]DCRRI4425.0[m]DCRRI4431.0[m]DCRRI4434.0[m]DCRRI4437.0[m]DCRRI4440.0[m]DCRRI4443.0[m]DCRRI4446.0[m]DCRRI4449.0[m]DCRRI4452.0[m]DCRRI4455.0[m]DCRRI4461.0[m]DCRRI4467.0[m]DCRRI4470.0[m]DCRRI4476.0[m]DCRRI4482.0[m]DCRRI4491.0[m]DCRRI4500.0[m]DCRRI4509.0[m]DCRRI4512.0[m]DCRRI4518.0[m]DCRRI4527.0[m]DCRRI4530.0[m]DCRRI4539.0[m]DCRRI4548.0[m]DCRRI4557.0[m]DCRRI4566.0[m]DCRRI4578.0[m]DCRRI4587.0[m]DCRRI4596.0[m]DCRRI4605.0[m]DCRRI4614.0[m]DCRRI4623.0[m]DCRRI4632.0[m]DCRRI4641.0[m]DCRRI4650.0[m]DCRRI4659.0[m]DCRRI4668.0[m]DCRRI4677.0[m]DCRRI4686.0[m]DCRRI4695.0[m]DCRRI4704.0[m]DCRRI4749.0[m]DCRRI4758.0[m]DCRRI4767.0[m]DCRRI4776.0[m]DCRRI4785.0[m]DCRRI4790.3[m]DCRRI4791.0[m]DCRRI4796.4[m]DCRRI4797.0[m]DCRRI4801.4[m]DCRRI4804.0[m]DCRRI4806.7[m]DCRRI4812.8[m]DCRRI4819.1[m]DCRRI4826.8[m]DCRRI4831.1[m]DCRRI4838.0[m]DCRRI4843.7[m]DCRRI4849.6[m]DCRRI4855.3[m]DCRRI4861.3[m]DCRRI4867.8[m]CRRI4871.2[m]CRRI4875.5[m]CRRI4879.9[m]CRRI4886.0[m]CRRI4889.4[m]CRRI4893.5[m]CRRI4899.4[m]CRRI4905.7[m]CRRI4911.3[m]CRRI4917.4[m]CRRI4926.5[m]CRRI4934.4[m]CRRI4938.4[m]CRRI4943.4[m]CRRI4947.9[m]CRRI4953.1[m]CRRI4957.4[m]CRRI4964.1[m]CRRI4969.6[m]CRRI4973.5[m]CRRI4979.3[m]CRRI4981.3[m]CRRI4987.8[m]CRRI4992.9[m]CRRI4997.4[m]CRRI5003.7[m]CRRI5008.4[m]CRRI5012.7[m]CRRI5019.0[m]CRRI5022.8[m]CRRI5024.4[m]CRRI5027.5[m]CRRI5031.8[m]CRRI5038.2[m]CRRI5046.0[m]CRRI5052.4[m]CRRI5058.7[m]CRRI5065.8[m]CRRI5074.3[m]CRRI5078.5[m]CRRI5084.3[m]CRRI5091.0[m]DCRRI5100.0[m]DCRRI5106.0[m]DCRRI5110.0[m]DCRRI -
Thin sections at the Norwegian Offshore Directorate
Thin sections at the Norwegian Offshore Directorate DepthUnit4266.38[m ]4272.12[m ]4273.00[m ]4276.95[m ]