6507/4-1
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General information
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Wellbore history
GeneralWell 6507/4-1 was drilled to test the Warka prospect on the Dønna Terrace in the Norwegian Sea. The primary objective was to prove reservoir presence, quality, and age (Late Albian - early Cenomanian age) of Intra Lange sandstones, and prove presence, saturation, and quality of hydrocarbons in the reservoir. A secondary objective was to test a possible deeper sand of Aptian age, the Warszawa lead.Operations and resultsWildcat well 6507/4-1 was spudded with the semi-submersible installation Leiv Eiriksson on 12 August 2020 and drilled to TD at 4985 m in the Early Cretaceous Lange Formation. Operations on this deep well proceeded without significant problems. The well was drilled with seawater and hi-vis pills down to 817 m, with KCl mud from 817 to 1420 m, with Innovert NS oil-based mud from 1420 to 2606.5 m, with BaraECD 3.2 oil-based mud from 2606 to TD.Three main Cretaceous sandstone sections were penetrated by the well: the Lysing Formation from 3037 to 3109 m, a K54 section from 3915 to 3971 m, and the target Late Albian Warka sandstone from 4608 to 4650 m. No Warszawa sandstones were present in the Aptian. The Warka sandstones were gas-condensate bearing with close to 39 m pay in both well tracks, the other sandstones were water bearing.The cored Warka sandstone in the side-track had weak shows consistent with a lean gas-condensate: slow diffuse moderate yellowish to bluish white cut fluorescence, 30% weak bluish white fluorescent residue. Otherwise, there were no shows above OBM in the well.A bypass coring side-track was made to core the Warka sandstones. This side-track, 6507/4-1 T2, was kicked off at 4386 m and TD'd at 4708 m. Five cores were cut in succession from 4546 to 4660.25 m. In total 111 meter core (97.3%) was recovered. Reservoir fluid samples were collected from the Lange K48 Warka sands with MDT in the main wellbore6507/4-1 and with ORA in side-track wellbore 6507/4-1 T2. Samples were taken at 4631.09 m in the main bore and at 4631.22 m in the side-track. All samples contained gas-condensate.The well was permanently abandoned on 10 November 2020 as a gas discovery.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]830.004985.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom14546.04570.7[m ]24571.24594.5[m ]34594.54612.1[m ]44614.54632.4[m ]54632.54660.3[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]111.2Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
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 typeCONDUCTOR30490.536493.00.00INTERM.20812.026817.01.43LOTLINER171410.017 1/21420.01.72LOTINTERM.13 3/82599.0162605.01.82LOTINTERM.9 7/84375.012 1/44405.02.12LOTOPEN HOLE4708.08 1/24708.00.00OPEN HOLE4985.08 1/24985.00.00 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]HXPT CMR LEHF43804695LWD - OT425817LWD - OT14204717LWD - OT45204700LWD - OT ST4931420LWD - OT TT ST47174985MDT46004649ORA46114647QAIT HASPS NEXT HL DS HNGS NGI G43754711QAIT MSIP HAPS HLDS HNGS LEHF42504705QAIT MSIP HAPS HLDS HNGS LEHF43754985QAIT SSC HAPS HLDS HNGS GR25704380VSI40554970 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit42514291844184419101910195120242024219725583037303731093915397146084650 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured5181.0310.00.4Water Base5501.5021.04.3Oil Base8171.2516.7Water Base14201.2617.011.4Water Base14751.4629.04.7Oil Base19581.5539.09.0Oil Base21351.5021.02.8Oil Base22631.7241.05.7Oil Base25521.745.7Oil Base26051.5730.07.1Oil Base33021.6424.04.7Oil Base38701.4329.06.2Oil Base41161.7233.06.2Oil Base42001.8442.95.7Oil Base42961.7230.04.7Oil Base47171.8239.05.2Oil Base47941.8334.03.7Oil Base48861.8639.03.7Oil Base49851.8736.05.2Oil Base