6406/2-7
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General information
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Wellbore history
GeneralWell 6406/2-7 was the fourth wildcat drilled in the PL 199 license. The well was drilled on the eastern part of the Erlend structure in the western part of block 6406/2, southwest of the Kristin Field and northwest of the 6406/2-6 Ragnfrid discovery on Haltenbanken. The Erlend structure is an easterly dipping segmented horst. Well 6406/2-7 was drilled high on the Erlend structure's southeastern high. The main objective of well 6406/2-7 was to test the hydrocarbon potential of the Erlend structure within the Early to Middle Jurassic Fangst and Båt Group sandstones. Late Cretaceous Lysing and Lange sandstones were secondary targets for the well.Operations and resultsWildcat well 6406/2-7 was spudded with the semi-submersible installation "Transocean Arctic" on 22 September 1999 and drilled to TD at 4981 m (4977 m TVD) in the Early Jurassic Tilje Formation. Shallow gas was not encountered in this well. Drilling went without major problems, but leakage in the 7" liner lap led to 8 days NPT. The well was drilled with water based bentonite mud down to 1406 m, with water based KCl mud from 1406 m to 2719 m, and with oil base mud from 2719 m to TD. Pore pressures of the Jurassic units were very high, reaching a gradient of 1.99 g/cc BMW in the upper part of the Garn Formation, and the overpressures in lower Tofte and lower Ile Formations were the highest measured in the area to date. The main result of well 6406/2-7 was the Erlend discovery of gas/condensate in the Garn and Ile Formations as proven by a DST in Garn and further MDT fluid samples in both formations. Increasing amounts of gas were measured in MDT samples upwards in Tofte Formation. In addition there were good indications of hydrocarbons in Lower Lange sandstones, but no hydrocarbon fluid samples were obtained from these units due to poor reservoir quality. The Tilje Formation appeared to be water bearing in the well position. Three conventional cores covering an 81,5 m section were cut in Not, Ile and Tofte Formations, with 97.4 % recovery. MDT samples were collected from the Garn (4558.5 m), Ile (4614.4 m and 4637.6 m), and Tofte (4712 m, 4721,7 m and 4738 m) Formations. The samples from the Garn, Upper Ile and Upper Tofte Formations contained free hydrocarbons. The deepest sample from 4738.0 m in Tofte was from a water column, whereas the other two sampled depths were in a transition zone. The samples collected from the lower Ile and Tofte Formations contained water. The well was suspended for possible later side-tracking as a gas and condensate discovery on 26 December 1999.TestingThe well was production tested from perforation interval 4558-4573 m in the Garn Formation. At the end of the flow period rates were measured to 496000 Sm3/D gas and 678 Sm3/D condensate (12.7 mm choke). The Gas to Oil Ratio at separator conditions 40 bar and 40 deg C was 746 Sm3/Sm3. -
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]1410.004980.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom14573.04599.3[m ]24625.04656.9[m ]34709.04730.2[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]79.3Cores 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 typeCONDUCTOR30379.036379.00.00LOTSURF.COND.18 5/81399.0241406.01.80LOTINTERM.13 3/82707.017 1/22719.01.96LOTINTERM.9 5/84458.012 1/44464.02.18LOTLINER74981.08 1/24981.00.00LOT -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.0455845730.0Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.050.00078.000164Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.06784960000.806731 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]AITB IPLT27104463AITB IPLT DSI AMS44654807HALS PEX DSI14012713LDT AMS GR44654579MDT AMS GR45594559MDT AMS GR45604742MDT GR27104390MDT GR45604712MDT GR47424928MLWD - CDR ISONIC27104579MLWD - CDR ISONIC ADN44654712MSCT GR28954429MSCT GR45004928MSCT GR45004802MWD - MPR3172713VSP00 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit3173171607198719872441244125062566256627052908351635163530454545584558457445994701470147084916 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.85 -
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].pdf6.32.pdf48.14 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured5121.03WATER BASED14061.05WATER BASED14061.3922.0KCL MUD14631.3919.0KCL MUD25621.6835.0KCL MUD27191.6850.0OIL BASED36481.7244.0OIL BASED40401.7243.0OIL BASED42001.8652.0OIL BASED43151.8648.0OIL BASED44011.8648.0OIL BASED44171.8746.0OIL BASED44631.8746.0OIL BASED44641.8847.0OIL BASED44692.0450.0OIL BASED45552.0450.0OIL BASED45732.0450.0OIL BASED45942.0651.0OIL BASED46002.0653.0OIL BASED46252.0654.0OIL BASED47292.0655.0OIL BASED49301.35BRINE49302.0614.0OIL BASED49812.0656.0OIL BASED -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory1420.0[m]DCSTRAT1440.0[m]DCSTRAT1460.0[m]DCSTRAT1480.0[m]DCSTRAT1500.0[m]DCSTRAT1540.0[m]DCSTRAT1560.0[m]DCSTRAT1580.0[m]DCSTRAT1600.0[m]DCSTRAT1620.0[m]DCSTRAT1640.0[m]DCSTRAT1660.0[m]DCSTRAT1680.0[m]DCSTRAT1700.0[m]DCSTRAT1720.0[m]DCSTRAT1740.0[m]DCSTRAT1760.0[m]DCSTRAT1780.0[m]DCSTRAT1800.0[m]DCSTRAT1840.0[m]DCSTRAT1860.0[m]DCSTRAT1900.0[m]DCSTRAT1920.0[m]DCSTRAT1940.0[m]DCSTRAT1960.0[m]DCSTRAT1980.0[m]DCSTRAT2000.0[m]DCSTRAT2020.0[m]DCSTRAT2040.0[m]DCSTRAT2060.0[m]DCSTRAT2080.0[m]DCSTRAT2100.0[m]DCSTRAT2120.0[m]DCSTRAT2140.0[m]DCSTRAT2160.0[m]DCSTRAT2180.0[m]DCSTRAT2200.0[m]DCSTRAT2220.0[m]DCSTRAT2240.0[m]DCSTRAT2260.0[m]DCSTRAT2280.0[m]DCSTRAT2300.0[m]DCSTRAT2320.0[m]DCSTRAT2340.0[m]DCSTRAT2360.0[m]DCSTRAT2380.0[m]DCSTRAT2400.0[m]DCSTRAT2420.0[m]DCSTRAT2440.0[m]DCSTRAT2460.0[m]DCSTRAT2480.0[m]DCSTRAT2500.0[m]DCSTRAT2520.0[m]DCSTRAT2540.0[m]DCSTRAT2560.0[m]DCSTRAT2580.0[m]DCSTRAT2620.0[m]DCSTRAT2640.0[m]DCSTRAT2660.0[m]DCSTRAT2680.0[m]DCSTRAT2700.0[m]DCSTRAT2720.0[m]DCSTRAT2740.0[m]DCSTRAT2760.0[m]DCSTRAT2780.0[m]DCSTRAT2800.0[m]DCSTRAT2820.0[m]DCSTRAT2840.0[m]DCSTRAT2860.0[m]DCSTRAT2880.0[m]DCSTRAT2895.0[m]SWCSTRAT2920.0[m]DCSTRAT2940.0[m]DCSTRAT2960.0[m]DCSTRAT2980.0[m]DCSTRAT3000.0[m]DCSTRAT3020.0[m]DCSTRAT3040.0[m]DCSTRAT3060.0[m]DCSTRAT3080.0[m]DCSTRAT3100.0[m]DCSTRAT3120.0[m]DCSTRAT3140.0[m]DCSTRAT3160.0[m]DCSTRAT3180.0[m]DCSTRAT3200.0[m]DCSTRAT3220.0[m]DCSTRAT3240.0[m]DCSTRAT3260.0[m]DCSTRAT3280.0[m]DCSTRAT3300.0[m]DCSTRAT3320.0[m]DCSTRAT3340.0[m]DCSTRAT3360.0[m]DCSTRAT3380.0[m]DCSTRAT3400.0[m]DCSTRAT3420.0[m]DCSTRAT3440.0[m]DCSTRAT3460.0[m]DCSTRAT3480.0[m]DCSTRAT3500.0[m]DCSTRAT3508.0[m]SWCSTRAT3520.0[m]DCSTRAT3522.0[m]SWCSTRAT3532.0[m]SWCSTRAT3560.0[m]DCSTRAT3580.0[m]DCSTRAT3600.0[m]DCSTRAT3620.0[m]DCSTRAT3640.0[m]DCSTRAT3660.0[m]DCSTRAT3680.0[m]DCSTRAT3700.0[m]DCSTRAT3720.0[m]DCSTRAT3740.0[m]DCSTRAT3742.0[m]SWCSTRAT3780.0[m]DCSTRAT3782.5[m]SWCSTRAT3800.0[m]DCSTRAT3820.0[m]DCSTRAT3840.0[m]DCSTRAT3860.0[m]DCSTRAT3880.0[m]DCSTRAT3900.0[m]DCSTRAT3920.0[m]DCSTRAT3940.0[m]DCSTRAT3955.0[m]DCSTRAT3980.0[m]DCSTRAT4000.0[m]DCSTRAT4020.0[m]DCSTRAT4040.0[m]DCSTRAT4055.0[m]DCSTRAT4080.0[m]DCSTRAT4100.0[m]DCSTRAT4120.0[m]DCSTRAT4140.0[m]DCSTRAT4160.0[m]DCSTRAT4180.0[m]DCSTRAT4200.0[m]DCSTRAT4220.0[m]DCSTRAT4240.0[m]DCSTRAT4260.0[m]DCSTRAT4280.0[m]DCSTRAT4300.0[m]DCSTRAT4320.0[m]DCSTRAT4340.0[m]DCSTRAT4360.0[m]DCSTRAT4380.0[m]DCSTRAT4389.5[m]SWCSTRAT4390.5[m]SWCSTRAT4400.0[m]DCSTRAT4420.0[m]DCSTRAT4440.0[m]DCSTRAT4460.0[m]DCSTRAT4480.0[m]DCSTRAT4500.0[m]DCSTRAT4500.0[m]SWCSTRAT4520.0[m]DCSTRAT4530.0[m]DCSTRAT4540.0[m]DCSTRAT4555.0[m]DCSTRAT4560.0[m]DCSTRAT4576.5[m]CSTRAT4577.1[m]CSTRAT4578.0[m]CSTRAT4583.0[m]CSTRAT4588.0[m]CSTRAT4590.0[m]CSTRAT4592.0[m]CSTRAT4594.4[m]CSTRAT4595.0[m]DCSTRAT4598.0[m]CSTRAT4602.0[m]DCSTRAT4625.0[m]DCSTRAT4632.3[m]CSTRAT4640.5[m]CSTRAT4645.0[m]CSTRAT4650.0[m]CSTRAT4654.7[m]CSTRAT4668.0[m]DCSTRAT4695.0[m]DCSTRAT4704.0[m]DCSTRAT4705.0[m]SWCSTRAT4709.9[m]CSTRAT4712.5[m]CSTRAT4714.0[m]SWCSTRAT4716.6[m]CSTRAT4737.0[m]DCSTRAT4746.0[m]DCSTRAT4773.0[m]DCSTRAT4800.0[m]DCSTRAT4818.0[m]DCSTRAT4839.0[m]DCSTRAT4852.0[m]SWCSTRAT4866.0[m]DCSTRAT4884.0[m]DCSTRAT4902.0[m]DCSTRAT4925.5[m]SWCSTRAT4927.5[m]SWCSTRAT4929.0[m]DCSTRAT4932.0[m]DCSTRAT4938.0[m]DCSTRAT4947.0[m]DCSTRAT4956.0[m]DCSTRAT4974.0[m]DCSTRAT4980.0[m]DCSTRAT