6406/2-6
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General information
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Wellbore history
GeneralWell 6406/2-6 was the third wildcat drilled in the PL 199 licence. The well was drilled on the southern part of the "C structure" in the southwestern part of block 6406/2, south of the Kristin Field and southwest of the 6406/2-1 Lavrans discovery on Haltenbanken. The C structure is an easterly dipping, rotated fault block, down faulted relative to the Lavrans structure and with structural similarities. The main objective of well 6406/2-6 was to test the hydrocarbon potential of the C structure within the Early and Middle Jurassic Fangst and Båt Group sandstones. Late Cretaceous Lysing and Lange sandstones were secondary targets for the well.Operations and resultsWildcat well 6406/2-6 was spudded by the semi-submersible installation "Deepsea Bergen" on 25 August 1998 and drilled to 5263 m, 58 m into the Early Jurassic Åre Formation. The well was a "High Pressure High Temperature" well with max down hole temperature of 177 deg C and max pressure gradient of 1.95 g/cc in top Garn Formation (4479 m TVD RKB). Shallow gas was not encountered and operations went without major problems. The well was drilled with seawater and hi-vis pills down to 1413 m, KCl mud with glycol additive (3 - 5 % Glydril MC) from 1413 m to 2760 m, and oil based mud from 2760 m to TD. Hydrocarbons were proven in Ile and Tofte Formations, and there where good hydrocarbon indications in the Garn and Lange Formations. The main result of well 6406/2-6 was the Ragnfrid discovery with gas/condensate in Ile and Tofte Formations as proven by fluid samples and good indications of hydrocarbons in upper part of Garn Formation and in Lower Lange sandstones. No hydrocarbon fluid samples were obtained from the latter units due to poor reservoir quality. The Tilje and Åre Formations appeared to be water bearing in the well position. The Tofte Formation has good to excellent reservoir properties, Ile properties are fair to good, Garn has poor to moderate reservoir properties except for a good zone in the middle part, and the Lange sandy intervals seem to have low permeabilities. One core (27m) was cut in the Garn Formation. Four MDT samples were taken in the hydrocarbon bearing Ile and Tofte Formations. One of these was recovered from 4737.4 m in the Tofte Formation; the other three were recovered from 4622.2 m in the Ile Formation. All four samples were heavily contaminated with oil-based mud. In addition to these, MDT water samples were collected from the Garn, Ile, and Tofte Formations. The well was suspended as a gas and condensate discovery on 7 November 1998.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]1420.005263.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom14504.04530.7[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]26.7Cores 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 typeCONDUCTOR30412.036412.00.00LOTINTERM.18 5/81408.0241408.01.66LOTINTERM.13 3/82748.017 1/22748.02.07LOTINTERM.9 5/84406.012 1/44406.02.18LOTOPEN HOLE5263.08 1/25263.00.00LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]AIT DSI GR44085261AIT GR44064877CMR IPLT44085244LDT CNT AMS GR27484577LDT CNT GR44084577MDT AMS GR27454307MDT GR27455261MSCT GR27485251MWD - RWD GR RES DIR3025263PI DSI LDT AMS GR14052750PI DSI LDT CNT GR27454416VSP44065261 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit32532515861978197825082508257726362636274629023515351535324422443244324433448044804573461747184718472549655204 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.54 -
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].pdf36.16 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured5851.207.0WATER BASED6601.2021.0WATER BASED6851.03SPUD MUD14131.30WATER BASED14181.3028.0WATER BASED25491.6845.0WATER BASED27601.6851.0WATER BASED32361.6443.0OIL BASED36611.7048.0OIL BASED38251.7447.0OIL BASED40531.7449.0OIL BASED44151.8552.0OIL BASED44302.0462.0OIL BASED45042.0458.0OIL BASED45252.0459.0OIL BASED45312.0459.0OIL BASED45752.0258.0OIL BASED46652.0463.0OIL BASED47002.0463.0OIL BASED48722.0462.0OIL BASED49132.0461.0OIL BASED50302.0468.0OIL BASED50862.0472.0OIL BASED52632.0473.0OIL BASED -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory1470.0[m]DCSTRAT1490.0[m]DCSTRAT1510.0[m]DCSTRAT1530.0[m]DCSTRAT1550.0[m]DCSTRAT1570.0[m]DCSTRAT1590.0[m]DCSTRAT1630.0[m]DCSTRAT1650.0[m]DCSTRAT1670.0[m]DCSTRAT1700.0[m]DCSTRAT1710.0[m]DCSTRAT1730.0[m]DCSTRAT1740.0[m]DCSTRAT1780.0[m]DCSTRAT1800.0[m]DCSTRAT1820.0[m]DCSTRAT1840.0[m]DCSTRAT1860.0[m]DCSTRAT1870.0[m]DCSTRAT1890.0[m]DCSTRAT1900.0[m]DCSTRAT1920.0[m]DCSTRAT1940.0[m]DCSTRAT1950.0[m]DCSTRAT1970.0[m]DCSTRAT1990.0[m]DCSTRAT2010.0[m]DCSTRAT2030.0[m]DCSTRAT2050.0[m]DCSTRAT2070.0[m]DCSTRAT2080.0[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]DCSTRAT2620.0[m]DCSTRAT2630.0[m]DCSTRAT2650.0[m]DCSTRAT2675.0[m]DCSTRAT2690.0[m]DCSTRAT2710.0[m]DCSTRAT2730.0[m]DCSTRAT2750.0[m]DCSTRAT2770.0[m]DCSTRAT2785.0[m]DCSTRAT2810.0[m]DCSTRAT2830.0[m]DCSTRAT2850.0[m]DCSTRAT2865.0[m]DCSTRAT2880.0[m]DCSTRAT2900.0[m]DCSTRAT2920.0[m]DCSTRAT2940.0[m]DCSTRAT2960.0[m]DCSTRAT2980.0[m]DCSTRAT3000.0[m]DCSTRAT3060.0[m]DCSTRAT3080.0[m]DCSTRAT3100.0[m]DCSTRAT3160.0[m]DCSTRAT3180.0[m]DCSTRAT3200.0[m]DCSTRAT3220.0[m]DCSTRAT3260.0[m]DCSTRAT3275.0[m]DCSTRAT3300.0[m]DCSTRAT3320.0[m]DCSTRAT3345.0[m]DCSTRAT3365.0[m]DCSTRAT3375.0[m]DCSTRAT3395.0[m]DCSTRAT3415.0[m]DCSTRAT3435.0[m]DCSTRAT3455.0[m]DCSTRAT3475.0[m]DCSTRAT3495.0[m]DCSTRAT3515.0[m]DCSTRAT3535.0[m]DCSTRAT3555.0[m]DCSTRAT3575.0[m]DCSTRAT3595.0[m]DCSTRAT3615.0[m]DCSTRAT3635.0[m]DCSTRAT3655.0[m]DCSTRAT3675.0[m]DCSTRAT3695.0[m]DCSTRAT3715.0[m]DCSTRAT3735.0[m]DCSTRAT3755.0[m]DCSTRAT3775.0[m]DCSTRAT3795.0[m]DCSTRAT3815.0[m]DCSTRAT3835.0[m]DCSTRAT3855.0[m]DCSTRAT3875.0[m]DCSTRAT3895.0[m]DCSTRAT3915.0[m]DCSTRAT3935.0[m]DCSTRAT3955.0[m]DCSTRAT3975.0[m]DCSTRAT3995.0[m]DCSTRAT4015.0[m]DCSTRAT4035.0[m]DCSTRAT4055.0[m]DCSTRAT4075.0[m]DCSTRAT4095.0[m]DCSTRAT4115.0[m]DCSTRAT4135.0[m]DCSTRAT4155.0[m]DCSTRAT4175.0[m]DCSTRAT4195.0[m]DCSTRAT4215.0[m]DCSTRAT4235.0[m]DCSTRAT4255.0[m]DCSTRAT4275.0[m]DCSTRAT4295.0[m]DCSTRAT4315.0[m]DCSTRAT4335.0[m]DCSTRAT4355.0[m]DCSTRAT4375.0[m]DCSTRAT4395.0[m]DCSTRAT4415.0[m]DCSTRAT4424.0[m]DCSTRAT4433.0[m]DCSTRAT4436.0[m]DCSTRAT4442.0[m]DCSTRAT4451.0[m]DCSTRAT4460.0[m]DCSTRAT4469.0[m]DCSTRAT4478.0[m]DCSTRAT4487.0[m]DCSTRAT4496.0[m]DCSTRAT4504.0[m]DCSTRAT4512.0[m]DCSTRAT4524.0[m]DCSTRAT4530.0[m]DCSTRAT4538.0[m]DCSTRAT4547.0[m]DCSTRAT4553.0[m]DCSTRAT4562.0[m]DCSTRAT4571.0[m]DCSTRAT4580.0[m]DCSTRAT4589.0[m]DCSTRAT4598.0[m]DCSTRAT4606.0[m]DCSTRAT4616.0[m]DCSTRAT4625.0[m]DCSTRAT4634.0[m]DCSTRAT4643.0[m]DCSTRAT4652.0[m]DCSTRAT4661.0[m]DCSTRAT4670.0[m]DCSTRAT4697.0[m]DCSTRAT4706.0[m]DCSTRAT4733.0[m]DCSTRAT4787.0[m]DCSTRAT4796.0[m]DCSTRAT4805.0[m]DCSTRAT4814.0[m]DCSTRAT4877.0[m]DCSTRAT4886.0[m]DCSTRAT4895.0[m]DCSTRAT4904.0[m]DCSTRAT4913.0[m]DCSTRAT4922.0[m]DCSTRAT4931.0[m]DCSTRAT4951.0[m]DCSTRAT4952.0[m]DCSTRAT4970.0[m]DCSTRAT4973.0[m]DCSTRAT4979.0[m]DCSTRAT4982.0[m]DCSTRAT4988.0[m]DCSTRAT4991.0[m]DCSTRAT4997.0[m]DCSTRAT5000.0[m]DCSTRAT5009.0[m]DCSTRAT5018.0[m]DCSTRAT5036.0[m]DCSTRAT5045.0[m]DCSTRAT5054.0[m]DCSTRAT5072.0[m]DCSTRAT5081.0[m]DCSTRAT5090.0[m]DCSTRAT5099.0[m]DCSTRAT5108.0[m]DCSTRAT5117.0[m]DCSTRAT5126.0[m]DCSTRAT5135.0[m]DCSTRAT5144.0[m]DCSTRAT5153.0[m]DCSTRAT5162.0[m]DCSTRAT5171.0[m]DCSTRAT5180.0[m]DCSTRAT5189.0[m]DCSTRAT5198.0[m]DCSTRAT5207.0[m]DCSTRAT5216.0[m]DCSTRAT5225.0[m]DCSTRAT5234.0[m]DCSTRAT5243.0[m]DCSTRAT5252.0[m]DCSTRAT5263.0[m]DCSTRAT