6407/9-3
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General information
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Wellbore history
GeneralAppraisal well 6407/9-3 was the third well on the antiform structure of the Draugen Field in the Haltenbanken area. It was placed on the crestal part of the structure, some four kilometres south of the discovery well. The main objectives of the well were to evaluate the lateral continuity and quality of the reservoir; to establish the velocity trend in a North-South direction; to improve the volumetric estimate; and to evaluate the oil deliverability.Operations and resultsAppraisal well 6407/9-3 was spudded with the semi-submersible installation Borgny Dolphin 3 may 1985 and drilled to TD at 1868 m in the Early Jurassic Tilje Formation. Drilling proceeded without serious problems, except for the sections trough glacial deposits were boulders caused minor problems. After setting 13 3/8" casing at 1601 m the RKB datum was shifted one m to 26 m above MSL. Operations were interrupted for nearly 17 days from 13 June 1985 by a crew strike. Although amplitude anomalies indicated gas charged sands, no shallow gas was encountered. The well was drilled with seawater and bentonite down to 781 m, with KCl mud from 781 m to 1617 m, and with chalk mud from 1617 m to TD.The top of the Rogn Formation was penetrated at 1630 m (1604 m SS) and the reservoir was oil bearing down to an oil-water contact at 1664 m (1638 m SS), which is in line with the OWC observed in the other Draugen wells. The contact in this well was interpreted in the transition between the good sands and the basal shales and was for that reason not very clear. The average hydrocarbon saturation was calculated as 82% over the 34 m oil column. Average porosity was 31% in this interval, of which 16.7 m had a porosity above 32.5%. Prior to testing an FMT survey was carried out: the reservoir pressure measured was hydrostatic, 2395 psia at datum (1630 m SS). The Garn Formation was penetrated from 1685 m to 1770 m and was water wet. Oil and oil shows were recorded in the Rogn formation only, not in any other porous section in the well. Nine conventional cores were cut in the interval 1620.5 m to 1679.8 m. One FMT oil sample was taken at 1637.5 m.The oil appraisal well 6407/9-3 was suspended 28 July 1985 as a possible producer. In 1993 it was re-entered reclassified to development well (producer).TestingOne DST test was performed. The oil column was perforated from 1630.5 m to 1642.5 m (1606.5 to 1618.5 m SS). The interval was gravel packed and flow rates up to 2496 Sm3/day (15700 stb/d) were achieved during the clean up. A multirate test incorporating 4 flow periods with a total flow duration of 36 hrs and a 24 hrs pressure build-up survey was carried out. The evaluation showed an average permeability of 5.7 Darcy over 36 m. Skins calculated ranged from 24 to 29. Observed productivity indices after gravel packing varied from 147 to 166 stb/d/psi. The calculated ideal PI is 660 stb/d/psi. With flow rate at 2496 Sm3/day on a 2 x 128/64" choke, GOR was 18 - 27 Sm3/Sm3 (100 - 150 scf/stb), oil gravity was 40 deg API, CO2 content was 0.75%, and H2S was not detectable. -
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]390.001869.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom11620.51621.2[m ]21621.81623.3[m ]51627.51628.0[m ]61634.01650.9[m ]71652.01667.0[m ]81667.01672.0[m ]91673.01679.8[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]46.4Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
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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 availableDSTTEST1E1631.001643.0020.07.1985 - 01:30YES -
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 typeCONDUCTOR30376.536383.00.00LOTSURF.COND.20770.026780.01.46LOTINTERM.13 3/81601.017 1/21617.01.66LOTINTERM.9 5/81843.012 1/41868.00.00LOT -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.01631164350.8Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.0Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.02500490000.8250.81021 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CDL CNL GR350778CDL CNL GR5501596CDL CNL SPL14501865CORGUN7701601CORGUN16011868DIFL ACL SP GR266779DIFL ACL SP GR7021605DIFL ACL SP GR15041867DIPLOG15951862DLL MLL GR15801864FMT16301847VELOCITY4011863 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit3048031310131013531518155515551593159316301668168516851771179717971821 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.42 -
Geochemical information
Geochemical information Document nameDocument formatDocument size [MB]pdf1.33 -
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]pdf5.94pdf0.88 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured3141.03WATER BASED06.05.19853831.03WATER BASED06.05.19853851.03WATER BASED07.05.19853851.0310.036.0WATER BASED09.05.19853851.0310.036.0WATER BASED09.05.19854181.25WATER BASED29.07.19857501.108.048.0WATER BASED13.05.19857601.086.029.0WATER BASED09.05.19857801.096.060.0WATER BASED10.05.19857801.117.049.0WATER BASED13.05.19857801.1110.030.0WATER BASED13.05.19857801.1110.030.0WATER BASED13.05.19857801.1111.038.0WATER BASED21.05.19857801.1111.038.0WATER BASED21.05.19857801.117.049.0WATER BASED13.05.19859701.3025.029.0WATER BASED21.05.198512501.15WATER BASED29.07.198512741.3223.021.0WATER BASED21.05.198515121.3423.019.0WATER BASED21.05.198515121.3424.022.0WATER BASED21.05.198515121.3424.022.0WATER BASED21.05.198515701.15WATER BASED26.07.198516121.2218.028.0WATER BASED31.05.198516171.3825.023.0WATER BASED21.05.198516171.3825.024.0WATER BASED22.05.198516171.3825.0WATER BASED23.05.198516171.3825.024.0WATER BASED22.05.198516171.3825.0WATER BASED23.05.198516201.2413.021.0WATER BASED29.05.198516271.2219.029.0WATER BASED03.06.198516331.2119.029.0WATER BASED03.06.198516491.2218.027.0WATER BASED12.06.198516651.2221.028.0WATER BASED14.06.198516651.2221.028.0WATER BASED17.06.198516651.2221.028.0WATER BASED17.06.198516661.15WATER BASED16.07.198516661.15WATER BASED22.07.198516661.15WATER BASED15.07.198516661.15WATER BASED22.07.198516661.15WATER BASED10.07.198516661.15WATER BASED12.07.198516661.15WATER BASED15.07.198516661.15WATER BASED18.07.198516661.15WATER BASED19.07.198516661.15WATER BASED23.07.198516661.15WATER BASED25.07.198516661.15WATER BASED26.07.198516661.15WATER BASED09.07.198516661.15WATER BASED10.07.198516661.15WATER BASED12.07.198516661.15WATER BASED16.07.198516661.15WATER BASED18.07.198516661.15WATER BASED19.07.198516661.15WATER BASED23.07.198516661.15WATER BASED25.07.198516661.15WATER BASED26.07.198516671.2320.030.0WATER BASED03.06.198516731.2321.028.0WATER BASED13.06.198516841.2321.030.0WATER BASED03.06.198518181.2219.028.0WATER BASED10.06.198518181.2219.029.0WATER BASED11.06.198518181.2219.029.0WATER BASED11.06.198518571.2118.027.0WATER BASED05.06.198518681.2118.028.0WATER BASED06.06.198518681.2118.027.0WATER BASED06.06.198518681.2118.027.0WATER BASED07.06.198518681.2118.029.0WATER BASED10.06.198518681.2118.027.0WATER BASED07.06.198518681.2118.029.0WATER BASED10.06.198518681.2118.027.0WATER BASED06.06.1985 -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory1640.2[m]CRRI1667.6[m]CRRI1668.2[m]CRRI -
Thin sections at the Norwegian Offshore Directorate
Thin sections at the Norwegian Offshore Directorate DepthUnit1640.30[m ]