6407/1-5 S
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General information
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Wellbore history
GeneralWell 6407/1-5 S was drilled to appraise the northern extension of the Maria Field in the Haltenbanken area in the Norwegian Sea. The primary objective was to test the sands in the Middle Jurassic Garn, Ile and Tilje Formations. In case of petroleum in the Garn Formation, a DST was planned to be carried out.Operations and resultsAppraisal well 6407/1-5 S was spudded with the semi-submersible installation Borgland Dolphin on 31 January 2012 and drilled to TD at 4177 m (4164 m TVD) in the Early Jurassic Tilje Formation. A 12 1/4" pilot hole was drilled from 398 m to 703 m and shallow gas was indicated. The 20" casing was set above the shallow gas zone, at 563 m. Due to the shallow gas, rough weather, rig repair, and additional coring and wire line runs total rig time became 26 days longer than planned, but otherwise there were no serious problem related to the operations and all objectives were met. It was drilled vertically down to 2300 m, with a 10.6 deg deviation from ca 2300 m to ca 3200 m and then again vertically from 3200 m through the reservoir section and down to TD. The well was drilled water based down to 1199 m and with Omniflow oil based mud from 1199 m to TD.The target Garn Formation was encountered at 3811 m (3797.8 m TVD) with a 40 m oil column down to the OWC at 3851 m. The Garn sandstone had a net/gross ratio of 0.99 only using a calcite flag as cut-off. The Ile and Tilje Formations were water bearing. Apart from shows in the hydrocarbon bearing section in the Garn Formation the only oil shows above the oil based mud in the well were in thin sandstone stringers in the lower part of the Melke Formation.Three cores were cut from 3785 m in the base of the Melke Formation to 3859 m in the Garn Formation. A fourth core was attempted but was accidentally left in the hole. RCI wire line samples were taken at 3826.5 m (oil), 3841.5 m (oil), 3858 m (water), and 3863.4 m (water).The well was permanently abandoned on 21 May 2012 as an oil and gas appraisal well.TestingOne drill stem test was carried out from the interval 3809 m to 3832 m in the Garn Formation. The test produced 101 Sm3 oil and 18512 Sm3 gas /day through a 28/64" choke. The gas contained 6 ppm H2S and 4 % CO2. The GOR was 183 Sm3/Sm3. The bottom hole temperature in the main flow was 135.2 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]570.004175.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom13785.03793.1[m ]23793.13832.6[m ]33832.63858.8[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]73.8Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit32932914831868186822252225228923582358253627303188318832283737373737583811381139023939402440244119 -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.03809382216.0Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.0135Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.0101185120.7890.904183 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]GR GEOWAVES21003900LWD - DIR GR PWD329562LWD - DIR GR RES PWD5623908LWD - DIR GR SON RES PWD398703LWD - RES BIT DIR GR RES PWD20154177MARCH JAR TTR GR XMAC 6CAL ORIT37664177MARCH JAR TTRM DSL CN ZDL FLEX37664177MRCH JAR GR PCOR38573869MRCH JAR TTR DSL CN ZDL ORIT XMA20153773MRCH JAR TTRM 6TC IFX RCI SPKR D38263858MRCH JAR TTRM GR EI ORIT ECBIL G37663975MRCH JAR TTRM GR MREX37664040MRCH JAR TTRM GR RCI IFX 6TC 4L39123950RCI20153215TLD APS ECS IS EDTC GR37663895ZAIT ADT5 HNGS IS EDTC37663908 -
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 typeCONDUCTOR30395.0360.00.00SURF.COND.20556.026556.01.36FITLINER161163.017 1/21202.01.63FITLINER13 3/81976.014 3/42019.01.77FITLINER9 5/83766.012 1/43776.01.60FITLINER74175.08 1/20.00.00OPEN HOLE4177.08 1/20.00.00 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured3951.2421.0Aqua-Drill4341.3932.0Aqua-Drill4681.5319.0Aquadrill5331.2418.0Aqua-Drill12001.2414.0Aqua-Drill12351.3420.0Aqua-Drill19351.5325.0Aqua-Drill37261.6936.0Carbo-sea OBM38321.1923.0Omniflow DIF38401.6946.0Carbosea38401.19Brine41771.1923.0Omniflow DIF