6507/7-3
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General information
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Wellbore history
GeneralAppraisal well 6507/7-3 was drilled in the northern part of the Haltenbanken area, some 190 km west of the Norwegian coast. It was drilled to evaluate the "B" prospect in the intensely faulted zone that lies at the intersection of the Nordland Ridge in the northeast and the Halten Terrace in the south. The prospect was in a southward plunging horst block formed by a Late Jurassic tensional fault system. The well was drilled down dip from the 6507/7-2 discovery well. It was designed to test the Middle Jurassic sands to determine whether an oil leg was present.Operations and resultsWell 6507/7-3 was spudded with the semi-submersible installation Nortrym on 29 July 1985 and drilled to TD at 2850 m in Early Jurassic sediments of the Åre Formation. Few problems were experienced during operations on 6507/7-3, those that did occur were predominantly related to gumbo and tight hole conditions. There were no serious accidents or problems during the operation. A total of 54 days was spent on drilling, logging, testing, and completion. The well was drilled with sea water and gel sweeps down to 1030 m, and with gypsum/polymer mud from 1030 m to TD.The Late Cretaceous (Santonian) was found directly overlying the Middle Jurassic (Callovian) Fangst Group as anticipated. No hydrocarbon fluorescence or staining was observed until the top of the Fangst Group at 2367.5 m. The Fangst and Båt Group was found oil bearing down to claystones belonging to the Ror Formation at 2540 m. Patchy fluorescence and a slight hydrocarbon odour persisted down to 2448 m. Using gradients established from electric logs, excellent RFT pressure data, and fluid analysis, the true oil/water contact was however indicated to be at 2491 m. No hydrocarbon fluorescence or staining was observed on cores or ditch cuttings below 2448 m.Thirteen cores were cut from 2360 to 2470 m and 2500 to 2662 m with 96% recovery from the Late Cretaceous through to the Early Jurassic. Analysis of cores and logs indicated good porosities and permeabilities, particularly in the upper section. RFT fluid sampling was done in the Fangst and Båt Groups at 2390 m, 2393 m, 2395 m, 2410 m, 2417 m, 2432 m, 2433.5 m, and 2444.5 mThe well was abandoned on 18 September 1985 as an oil and gas appraisal well.TestingThree drill stem tests were undertaken, all of them testing the oil-bearing sands of the Fangst Group. The intervals perforated were: 2413 - 2430 m (DST 1), 2385 - 2400 m (DST 2), and 2368 - 2380 m (DST 3). At stabilized conditions on various choke sizes, peak production of oil on test was 870 Sm3/ day (5465 BOPD), with an oil gravity of 29 deg API. Associated gas production was 93000 Sm3/day (3.285 MMCFD) with a gravity of 0.67 with respect to air. The average temperatures measured at gauge carrier depth were 86.1, 85.9, and 84.8 deg C in DST, DST 2, and DST 3, respectively -
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]460.002846.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12360.02360.7[m ]22361.02376.6[m ]32381.02386.7[m ]42386.12414.5[m ]52415.02442.8[m ]62442.82471.0[m ]72500.02519.7[m ]82521.02541.7[m ]92543.02569.1[m ]102570.02586.5[m ]112587.02616.5[m ]122615.52643.0[m ]132643.02661.0[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]264.4Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory2141.0[m]DCOD2159.0[m]DCOD2186.0[m]DCOD2201.0[m]DCOD2231.0[m]DCOD2255.0[m]COD2270.0[m]DCOD2321.0[m]DCOD2345.0[m]DCOD2359.1[m]CSAGA2359.5[m]CSAGA2360.0[m]COD2360.3[m]COD2361.0[m]COD2361.7[m]COD2362.6[m]COD2362.9[m]COD2363.4[m]COD2363.7[m]COD2364.0[m]COD2365.0[m]COD2365.5[m]CSAGA2365.5[m]COD2366.0[m]COD2366.3[m]COD2367.0[m]COD2367.3[m]COD2367.4[m]CSAGA2367.6[m]CSAGA2367.7[m]COD2368.0[m]COD2373.0[m]COD2376.0[m]COD2382.7[m]COD2383.5[m]COD2404.0[m]COD2408.4[m]COD2410.9[m]COD2469.5[m]COD2471.1[m]COD2523.1[m]COD -
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 availableDSTDST12413.002430.0003.09.1985 - 00:00YESDSTDST22385.002400.0008.09.1985 - 00:00YESDSTDST32368.002380.0012.09.1985 - 00:00YES -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit371371147219061906199019902021208123682368240024122434243424992720 -
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]pdf12.38pdf1.92 -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.02413243021.02.02385240024.03.02368238025.4Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.06.0005.00025.000882.06.0004.00025.000873.06.0005.00025.00085Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.0772860270.8700.6801122.0870930210.9090.7372273.0823895100.8080.745417 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL VDL GR CCL15002804CBL VDL GR CCL22912291CST23102832DIL LSS GR SP22922847DLL MSFL GR SP22922706FDC CNL GR21402846ISF LSS MSFL GR SP4691027ISF LSS MSFL GR SP10242137LDT CNL GR10242140LDT CNL NGS22922845MWD - GYRO MULTISHOT3752834RFT23692601SHDT22352845VSP4732834 -
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 typeCONDUCTOR30469.036469.00.00LOTSURF.COND.201024.0261030.01.49LOTINTERM.13 3/82291.017 1/22307.01.75LOTINTERM.13 3/82307.017 1/22360.01.75LOTINTERM.9 5/82832.012 1/42850.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured4691.14100.057.5WATER BASED30.07.19854691.03100.047.8WATER BASED31.07.19854691.07100.0WATER BASED30.07.19854691.14100.057.5WATER BASED30.07.19854691.03100.047.8WATER BASED31.07.198510301.168.037.6WATER BASED05.08.198510301.147.0234.6WATER BASED01.08.198510301.168.037.6WATER BASED05.08.198510351.0948.0105.0WATER BASED07.08.198516301.2959.0105.0WATER BASED08.08.198519831.3822.0148.4WATER BASED09.08.198522481.3827.01056.0WATER BASED08.08.198523071.3826.0105.6WATER BASED08.08.198523071.3825.096.0WATER BASED12.08.198523071.2615.067.2WATER BASED12.08.198523071.2616.062.4WATER BASED13.08.198523071.3923.01008.0WATER BASED08.08.198523071.3826.0105.6WATER BASED08.08.198523071.3825.096.0WATER BASED12.08.198523071.2615.067.2WATER BASED12.08.198523071.2616.062.4WATER BASED13.08.198523601.2617.067.2WATER BASED15.08.198523811.2618.099.0WATER BASED19.08.198524191.2619.096.0WATER BASED19.08.198524701.2619.096.0WATER BASED19.08.198525211.2618.0115.0WATER BASED17.08.198525661.2618.023.0WATER BASED21.08.198525881.2619.0110.4WATER BASED21.08.198526431.2721.0124.8WATER BASED23.08.198527761.2719.0115.2WATER BASED26.08.198528501.2716.0105.0WATER BASED26.08.198528501.2716.095.7WATER BASED24.08.1985 -
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]pdf0.27