6406/2-5
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General information
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Wellbore history
GeneralWell 6406/2-5 was the second well drilled on the Kristin structure in the north-western part of block 6406/2, south-west of the Smørbukk Field and north-west of the Lavrans Field on Haltenbanken). The discovery well 6406/2-3 was drilled high on the structure; it tested gas and condensate in a down-to situation in both the Garn and the Ile Formations. The main objective of well 6406/2-5 was to test the hydrocarbon potential of the Garn and Ile Formations in a down flank position. In addition the well would test a secondary reservoir target of late Jurassic age, the Rogn sandstone, which was predicted based on seismic observations.Operations and resultsAppraisal well 6406/2-5 was drilled with the semi-submersible drilling installation "Deepsea Bergen". The well was spudded on 3 June 1997 and drilled to TD at 5439 m in the Åre Formation. It was drilled with spud mud down to 1407 m, with KCl mud from 1407 m to 2612 m, and with oil based mud from 2612 m to TD. No hydrocarbon bearing formations were encountered in well 6406/2-5. Hydrocarbon shows were observed in both the Garn and Ile Formations, but wire line logs, pressure measurements and fluid samples proved the well to be dry. In the well position the Viking Group consisted of the Spekk and Melke Formation shales, while the Late Jurassic Rogn sandstone was not observed. The Garn Formation in well 6406/2-5 had distinctively reduced permeabilities and slightly reduced porosities compared to the parameters of well 6406/2-3. The low permeabilities of the Garn Formation made it difficult to perform pressure measurements, thus no reliable pressure gradient could be established in the Garn Formation. The Ile Formation reservoir parameters in well 6406/2-5 were similar to what was experienced in well 6406/2-3, with variable, but in parts excellent porosity and permeability values. Water gradients were established based on pressure measurements in the Ile, Tofte, Tilje and Åre Formations. Pore pressures of the Jurassic units were very high, reaching a gradient of 1.95 g/cc BMW in upper part of the Garn Formation. Thirteen cores were cut from the Middle to Lower Jurassic Garn, Not, Ile, Ror, and Tofte Formations. A total of 321,72 meter was cored, of which 98,38 % was recovered. Modular Formation Dynamics Tester (MDT) and RFT water samples were collected from the Garn, Ile, Tofte and Tilje Formations. It was plugged for geological sidetrack on 29 September 1997.TestingNo drill stem test was performed. -
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]1410.005439.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom14795.04803.9[m ]24805.04833.0[m ]34833.04861.2[m ]44861.54888.9[m ]54889.54918.0[m ]64918.04944.9[m ]74945.04973.5[m ]84973.54991.6[m ]94991.65020.0[m ]105019.55073.3[m ]115073.55105.3[m ]125105.35105.4[m ]135105.05111.0[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]314.6Cores 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 typeSURF.COND.30451.036450.00.00LOTINTERM.18 3/81399.0241400.01.64LOTINTERM.13 3/82650.017 1/22655.02.00LOTINTERM.9 5/84523.012 1/44533.02.12LOTOPEN HOLE5439.08 1/25439.00.00LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]AIT DSI GR45185441AIT IPLT GR49165102BGT GPIT AMS GR26504537BGT GR45185297CST GR45395295IPLT CMR45184939IPLT ECS45185444IPLT GR50055231LDT GR45234806MDT GR43754494MDT GR47934798MDT GR47974877MDT GR47985030MDT GR48815218MDT GR50015421MSCT GR26704515MWD DPR DIR GR3645439OBDT CNL GR45184944PI DSI LDT AMS GR13982653PI DSI LDT CNL AMS GR26504537PI GR48855106RFT GR48774877VSP30005220 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit364364154019761976234023402397246924692674286734803480350146544792479249124950504350435108520752105396 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.78 -
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]pdf8.22pdf34.96 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured6121.2017.0WATER BASED9001.2018.0WATER BASED14071.3023.0WATER BASED16531.3117.0KCL MUD22351.6430.0KCL MUD24751.6731.0KCL MUD31121.6650.0OIL BASED35741.7555.0OIL BASED38631.7652.0OIL BASED41681.8249.0OIL BASED41991.8249.0OIL BASED42591.8250.0OIL BASED43161.8252.0OIL BASED43461.8349.0OIL BASED43991.8247.0OIL BASED44401.8247.0OIL BASED45091.8351.0OIL BASED45331.8351.0OIL BASED45382.0689.0OIL BASED45782.0675.0OIL BASED46312.0673.0OIL BASED46872.0659.0OIL BASED47332.0659.0OIL BASED47632.0862.0OIL BASED47752.0659.0OIL BASED47952.0657.0OIL BASED47962.0460.0OIL BASED48622.0456.0OIL BASED48902.0457.0OIL BASED49182.0462.0OIL BASED49442.0453.0OIL BASED49452.0455.0OIL BASED49732.0456.0OIL BASED49922.0458.0OIL BASED50192.0459.0OIL BASED50802.0458.0OIL BASED51052.0462.0OIL BASED51162.0464.0OIL BASED51292.0256.0OIL BASED51292.0258.0OIL BASED51302.0258.0OIL BASED51662.0260.0OIL BASED52212.0265.0OIL BASED52292.0265.0OIL BASED52712.0264.0OIL BASED53142.0258.0OIL BASED53432.0260.0OIL BASED53482.0460.0OIL BASED53932.0260.0OIL BASED54332.0261.0OIL BASED54391.8650.0OIL BASED59732.0458.0OIL BASED -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory1410.0[m]DCSTRAT1430.0[m]DCSTRAT1450.0[m]DCSTRAT1470.0[m]DCSTRAT1500.0[m]DCSTRAT1510.0[m]DCSTRAT1530.0[m]DCSTRAT1550.0[m]DCSTRAT1570.0[m]DCSTRAT1590.0[m]DCSTRAT1610.0[m]DCSTRAT1630.0[m]DCSTRAT1650.0[m]DCSTRAT1670.0[m]DCSTRAT1690.0[m]DCSTRAT1710.0[m]DCSTRAT1730.0[m]DCSTRAT1760.0[m]DCSTRAT1770.0[m]DCSTRAT1790.0[m]DCSTRAT1820.0[m]DCSTRAT1830.0[m]DCSTRAT1850.0[m]DCSTRAT1870.0[m]DCSTRAT1890.0[m]DCSTRAT1910.0[m]DCSTRAT1930.0[m]DCSTRAT1950.0[m]DCSTRAT1970.0[m]DCSTRAT1990.0[m]DCSTRAT2010.0[m]DCSTRAT2030.0[m]DCSTRAT2050.0[m]DCSTRAT2070.0[m]DCSTRAT2090.0[m]DCSTRAT2110.0[m]DCSTRAT2130.0[m]DCSTRAT2150.0[m]DCSTRAT2170.0[m]DCSTRAT2190.0[m]DCSTRAT2210.0[m]DCSTRAT2230.0[m]DCSTRAT2250.0[m]DCSTRAT2270.0[m]DCSTRAT2290.0[m]DCSTRAT2310.0[m]DCSTRAT2330.0[m]DCSTRAT2350.0[m]DCSTRAT2370.0[m]DCSTRAT2390.0[m]DCSTRAT2410.0[m]DCSTRAT2430.0[m]DCSTRAT2450.0[m]DCSTRAT2470.0[m]DCSTRAT2490.0[m]DCSTRAT2510.0[m]DCSTRAT2530.0[m]DCSTRAT2550.0[m]DCSTRAT2570.0[m]DCSTRAT2590.0[m]DCSTRAT2610.0[m]DCSTRAT2630.0[m]DCSTRAT2650.0[m]DCSTRAT2675.0[m]DCSTRAT2700.0[m]DCSTRAT2710.0[m]DCSTRAT2730.0[m]DCSTRAT2745.0[m]DCSTRAT2770.0[m]DCSTRAT2790.0[m]DCSTRAT2810.0[m]DCSTRAT2830.0[m]DCSTRAT2850.0[m]DCSTRAT2870.0[m]DCSTRAT2890.0[m]DCSTRAT2910.0[m]DCSTRAT2930.0[m]DCSTRAT2950.0[m]DCSTRAT2970.0[m]DCSTRAT2990.0[m]DCSTRAT3010.0[m]DCSTRAT3030.0[m]DCSTRAT3050.0[m]DCSTRAT3070.0[m]DCSTRAT3090.0[m]DCSTRAT3110.0[m]DCSTRAT3130.0[m]DCSTRAT3150.0[m]DCSTRAT3170.0[m]DCSTRAT3190.0[m]DCSTRAT3210.0[m]DCSTRAT3230.0[m]DCSTRAT3250.0[m]DCSTRAT3270.0[m]DCSTRAT3290.0[m]DCSTRAT3310.0[m]DCSTRAT3330.0[m]DCSTRAT3350.0[m]DCSTRAT3370.0[m]DCSTRAT3390.0[m]DCSTRAT3410.0[m]DCSTRAT3430.0[m]DCSTRAT3450.0[m]DCSTRAT3470.0[m]DCSTRAT3490.0[m]DCSTRAT3510.0[m]DCSTRAT3530.0[m]CSTRAT3550.0[m]DCSTRAT3570.0[m]DCSTRAT3590.0[m]DCSTRAT3610.0[m]DCSTRAT3630.0[m]DCSTRAT3650.0[m]DCSTRAT3670.0[m]DCSTRAT3690.0[m]DCSTRAT3710.0[m]DCSTRAT3730.0[m]DCSTRAT3750.0[m]DCSTRAT3770.0[m]DCSTRAT3790.0[m]DCSTRAT3810.0[m]DCSTRAT3830.0[m]DCSTRAT3850.0[m]DCSTRAT3870.0[m]DCSTRAT3890.0[m]DCSTRAT3910.0[m]DCSTRAT3930.0[m]DCSTRAT3950.0[m]DCSTRAT3970.0[m]DCSTRAT3990.0[m]DCSTRAT4010.0[m]DCSTRAT4030.0[m]DCSTRAT4050.0[m]DCSTRAT4070.0[m]DCSTRAT4090.0[m]DCSTRAT4110.0[m]DCSTRAT4130.0[m]DCSTRAT4150.0[m]DCSTRAT4170.0[m]DCSTRAT4190.0[m]DCSTRAT4210.0[m]DCSTRAT4230.0[m]DCSTRAT4250.0[m]DCSTRAT4290.0[m]DCSTRAT4310.0[m]DCSTRAT4330.0[m]DCSTRAT4350.0[m]DCSTRAT4370.0[m]DCSTRAT4390.0[m]DCSTRAT4410.0[m]DCSTRAT4430.0[m]DCSTRAT4450.0[m]DCSTRAT4470.0[m]DCSTRAT4490.0[m]DCSTRAT4510.0[m]DCSTRAT4530.0[m]DCSTRAT4548.0[m]DCSTRAT4569.0[m]DCSTRAT4605.0[m]DCSTRAT4659.0[m]DCSTRAT4668.0[m]DCSTRAT4677.0[m]DCSTRAT4686.0[m]DCSTRAT4695.0[m]DCSTRAT4705.0[m]DCSTRAT4713.0[m]DCSTRAT4731.0[m]DCSTRAT4749.0[m]DCSTRAT4758.0[m]DCSTRAT4767.0[m]DCSTRAT4776.0[m]DCSTRAT4785.0[m]DCSTRAT4791.0[m]DCSTRAT4857.0[m]CSTRAT4901.0[m]CSTRAT4919.0[m]CSTRAT4928.0[m]CSTRAT4937.0[m]CSTRAT4946.0[m]CSTRAT4955.0[m]CSTRAT4964.0[m]CSTRAT4973.5[m]CSTRAT4995.0[m]CSTRAT5040.6[m]CSTRAT5049.0[m]CSTRAT5058.0[m]CSTRAT5067.0[m]CSTRAT5073.5[m]CSTRAT5082.0[m]CSTRAT5091.0[m]CSTRAT5100.0[m]CSTRAT5105.0[m]CSTRAT5118.0[m]DCSTRAT5175.0[m]DCSTRAT5193.0[m]DCSTRAT5202.0[m]DCSTRAT5211.0[m]DCSTRAT5220.0[m]DCSTRAT5229.0[m]DCSTRAT5238.0[m]DCSTRAT5310.0[m]DCSTRAT5328.0[m]DCSTRAT5382.0[m]DCSTRAT5388.0[m]DCSTRAT5400.0[m]DCSTRAT5409.0[m]DCSTRAT5418.0[m]DCSTRAT5427.0[m]DCSTRAT5436.0[m]DCSTRAT5439.0[m]DCSTRAT