6407/9-2
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General information
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Wellbore history
GeneralAppraisal well 6407/9-2 was the second well in the Northern part of the Draugen Discovery on the Haltenbanken. The main objectives of the appraisal were to improve estimation of oil in place; to evaluate the reservoir quality and sand development on the Northern flank of the structure; calibration of the seismic time pick and velocity model; and to evaluate the oil deliverability and water injection characteristics.Operations and resultsAppraisal well 6407/9-2 was spudded with the semi-submersible installation Borgny Dolphin on 18 November 1984 and drilled to TD at 1865 m in the Early Jurassic Tilje Formation. The well was drilled with seawater and bentonite down to 813.5 m and with KCl/Polymer mud from 813.5 m to TD. No shallow gas was encountered.The Rogn Formation came in twenty m below prognosed depth at 1650 m. It consisted of an overall coarsening upwards sand sequence and contained an oil column of 12.5 m down to an oi1/ water contact at 1663.5 m. The calculated porosity was fairly constant throughout the reservoir at approximately 27%, while measured permeability decreased from up to 5 Darcy in the oil-bearing interval down to 20 mD towards the base of the reservoir. Eight conventional cores were cut from 1638 m to 1706.5 m. Several runs were made with the RFT: the reservoir pressure measured was hydrostatic, 2392 psia at 1625 m. No down hole fluid sample was recovered due to repeated plugging of the sampling probe.The well was permanently abandoned on 2 February as an oil appraisalTestingTwo DST tests were performed. The water zone was perforated from 1670 to 1675.5 m. An eight hours water injection test at rates up to 8000 b/d did not reveal any immediate problems related to injection of unfiltered clean seawater. After the water zone test the oil zone was perforated from 1651 to 1657 m. The well was gravel packed and rates up to 1177 Sm3/day (7400 stb/d) of 40 deg API oil were achieved. The evaluation showed a permeability of 2.6 Darcy. The reservoir temperature was 67 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]360.001866.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom11638.01639.3[m ]21640.01641.0[m ]31653.51670.0[m ]41671.51680.7[m ]51684.01686.7[m ]61688.01693.8[m ]81702.01706.2[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]40.6Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
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Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory760.0[m]DCOD770.0[m]DCOD780.0[m]DCOD790.0[m]DCOD800.0[m]DCOD810.0[m]DCOD820.0[m]DCOD830.0[m]DCOD840.0[m]DCOD850.0[m]DCOD860.0[m]DCOD870.0[m]DCOD880.0[m]DCOD890.0[m]DCOD900.0[m]DCOD1638.0[m]CRRI1639.3[m]CRRI1640.0[m]CRRI1641.1[m]CRRI1663.2[m]CRRI1665.3[m]CRRI1666.1[m]CRRI1667.9[m]CRRI1674.4[m]CRRI1675.7[m]CRRI1677.2[m]CRRI1678.5[m]CRRI1679.7[m]CRRI1684.6[m]CRRI1685.9[m]CRRI1691.6[m]CRRI1702.0[m]CRRI1703.3[m]CRRI1703.8[m]CRRI1703.9[m]CRRI1704.6[m]CRRI1705.0[m]CRRI1705.5[m]CRRI -
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 availableDSTDST21651.001657.0016.01.1985 - 00:00YES -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit27227280786086013841384142015661566159415941610162016201650170217021765180218021829 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.32 -
Geochemical information
Geochemical information Document nameDocument formatDocument size [MB]pdf0.52 -
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]pdf5.14pdf0.97 -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.01670167615.82.01651165738.0Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.02.0Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.02.01177435490.8250.96037 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL VDL GR10541799CBL VDL GR CCL4501574CNL GR15701648DLL MSFL GR15741858ISF LSS GR347812ISF LSS GR7991583ISF LSS GR15741862LDL CNL GR347813LDL CNL GR7991583LDL CNL NGT15741862RFT16521745SHDT GR15741863SWS15791851VELOCITY5241850 -
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 typeCONDUCTOR30346.036350.00.00SURF.COND.20800.026810.01.48LOTINTERM.13 3/81575.017 1/21587.01.67LOTINTERM.9 5/81852.012 1/41865.00.00 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured3521.098.024.0WATER BASED22.11.19848101.115.025.0WATER BASED23.11.19848101.116.029.0WATER BASED26.11.19848101.125.024.0WATER BASED26.11.19848101.118.020.0WATER BASED27.11.19848101.03WATER BASED28.11.19848101.03WATER BASED29.11.19848101.03WATER BASED30.11.19848101.03WATER BASED04.12.19848101.116.029.0WATER BASED26.11.19848101.125.024.0WATER BASED26.11.19848101.118.020.0WATER BASED27.11.19848101.03WATER BASED28.11.19848101.03WATER BASED29.11.19848101.03WATER BASED30.11.19848101.03WATER BASED04.12.198410571.3319.021.0WATER BASED04.12.198412331.3718.018.0WATER BASED04.12.198414521.4124.020.0WATER BASED04.12.198415841.4225.022.0WATER BASED05.12.198415871.2514.014.0WATER BASED10.12.198415871.4224.020.0WATER BASED06.12.198415871.4218.025.0WATER BASED07.12.198415871.2516.016.0WATER BASED10.12.198415871.2516.015.0WATER BASED10.12.198415871.4214.014.0WATER BASED11.12.198415871.4214.014.0WATER BASED12.12.198415871.42WATER BASED12.12.198415871.4218.025.0WATER BASED07.12.198415871.2516.016.0WATER BASED10.12.198415871.2516.015.0WATER BASED10.12.198415871.2514.014.0WATER BASED10.12.198415871.4214.014.0WATER BASED11.12.198415871.4214.014.0WATER BASED12.12.198415871.42WATER BASED12.12.198416041.2315.013.0WATER BASED17.12.198416401.2317.015.0WATER BASED17.12.198416541.2317.021.0WATER BASED17.12.198416881.2318.018.0WATER BASED17.12.198417021.2416.018.0WATER BASED19.12.198417021.2416.018.0WATER BASED18.12.198418121.2416.022.0WATER BASED18.12.198418121.2416.022.0WATER BASED19.12.198418651.2418.022.0WATER BASED26.12.198418651.2416.018.0WATER BASED26.12.198418651.2417.019.0WATER BASED26.12.198418651.03WATER BASED26.12.198418651.15WATER BASED01.01.198518651.2418.022.0WATER BASED26.12.198418651.2416.018.0WATER BASED26.12.198418651.2417.019.0WATER BASED26.12.198418651.03WATER BASED26.12.198418651.14WATER BASED27.12.198418651.2318.022.0WATER BASED20.12.198418651.14WATER BASED27.12.198418651.15WATER BASED01.01.1985 -
Pressure plots
Pressure plots The pore pressure data is sourced from well logs if no other source is specified. In some wells where pore pressure logs do not exist, information from Drill stem tests and kicks have been used. The data has been reported to the NPD, and further processed and quality controlled by IHS Markit.Pressure plots Document nameDocument formatDocument size [MB]PDF0.25