7335/3-1
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General information
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Wellbore history
Well 7335/3-1 was drilled to test the Korpfjell Deep on the Haapet Dome far north-east on the Bjarmeland Platform in the Barents Sea. The prospect is a faulted dome, divided into several segments, separated by faults and saddle points. Well 7335/3-1 was the second well drilled on the structure. The primary objective was to test the Realgrunnen Subgroup within the Kapp Toscana Group in segment B, and if oil is discovered, to acquire enough data to determine commerciality and need of appraisal wells. The secondary objectives were to test 4 deeper targets within the central segments: the Intra Snadd Formation Carnian sandstone, the Kobbe Formation, the Havert Formation and Havert clinoforms. The well should also clarify presence of Late Permian source rocks (Ørret Formation), if feasible. The well was committed to drill to 4000 m MSL.Operations and resultsA 9 7/8” pilot well (7335/3-U-1) was drilled ca 26 m southeast of the main well to confirm the stratigraphic depth prognosis in order to prevent riserless drilling into reservoir in main well. The pilot was drilled to 547 m, below setting depth for the 20” casing shoe in the main well. No shallow gas or water flow was observed and the prognosed stratigraphy was confirmed.Wildcat well 7335/33-1 was spudded with the semi-submersible installation West Hercules on 13 May 2019 and drilled to TD at 4300 m in the Triassic Havert Formation. Operations proceeded without significant problems. The well was drilled with seawater and hi-vis pills down to 537 m, with Glydril mud from 537 to from 1046 m and with Exploradril oil-based mud from 1046 m to TD.Water filled reservoir with good reservoir properties was encountered within the Realgrunnen Subgroup. The well encountered sandy but tight intervals within the Havert Formation (primary target) and in the Klappmyss Formation. Tight sands were also encountered within the Kobbe and Snadd formations. The well TD’d above the Permian, so potential source rock within the Ørret Formation was not evaluated.No conclusive shows were recorded in the well. Direct fluorescence (no cut) in the interval 980 to 1027 m was observed in carbonaceous claystone in the Snadd Formation. Elevated mud gas was recorded in the same interval. The gas was however dry and believed to be related to the rather extensive coal layers and carbonaceous claystones observed in the ditch cuttings. Other observed fluorescence in the sections that was drilled water-based is interpreted as mineral fluorescence or even due to the glycol additive in the mud. In the oil-based sections no oil shows were observed on cuttings or sidewall cores. Several relative high peaks with very dry gas were however registered in the lower Havert FormationNo cores were cut. No fluid sample was taken.The well was permanently abandoned on 15 June 2019 as a dry well.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]540.004300.00 -
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 typeCONDUCTOR36318.442322.60.00SURF.COND.20531.226537.01.64FITPILOT HOLE644.012 1/4644.00.00INTERM.13 5/81040.6161046.02.06LOTINTERM.9 5/82600.012 1/42601.01.77LOTOPEN HOLE4300.08 1/24300.00.00 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]MWD - ARC TELE322644MWD - PD ARC TELE6441046MWD - PD GVR ARC TELE SS ADN WDP10462601MWD - PD GVR ES TS SS WDP26014300MWD - TELE270322XLR26314270ZO VSP2564279 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit2702752754914965435775775806446658011162116216183060 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured4921.1817.5Glydril4921.1817.5Seawater5901.1414.0Glydril10411.1417.0Glydril10461.1415.0EMS 440023801.1416.0EMS 440027031.1417.0EMS 440038621.1616.0EMS 440040351.1717.5EMS 440043001.1817.5EMS 4400 -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory540.0[m]DCCGG543.0[m]DCCGG549.0[m]DCCGG555.0[m]DCCGG561.0[m]DCCGG567.0[m]DCCGG573.0[m]DCCGG576.0[m]DCCGG579.0[m]DCCGG582.0[m]DCCGG591.0[m]DCCGG600.0[m]DCCGG609.0[m]DCCGG618.0[m]DCCGG627.0[m]DCCGG636.0[m]DCCGG644.0[m]DCCGG654.0[m]DCCGG663.0[m]DCCGG669.0[m]DCCGG678.0[m]DCCGG687.0[m]DCCGG696.0[m]DCCGG705.0[m]DCCGG714.0[m]DCCGG723.0[m]DCCGG732.0[m]DCCGG741.0[m]DCCGG750.0[m]DCCGG759.0[m]DCCGG768.0[m]DCCGG777.0[m]DCCGG786.0[m]DCCGG795.0[m]DCCGG804.0[m]DCCGG813.0[m]DCCGG822.0[m]DCCGG831.0[m]DCCGG840.0[m]DCCGG849.0[m]DCCGG858.0[m]DCCGG867.0[m]DCCGG876.0[m]DCCGG885.0[m]DCCGG894.0[m]DCCGG903.0[m]DCCGG912.0[m]DCCGG921.0[m]DCCGG930.0[m]DCCGG939.0[m]DCCGG948.0[m]DCCGG957.0[m]DCCGG966.0[m]DCCGG975.0[m]DCCGG984.0[m]DCCGG993.0[m]DCCGG1002.0[m]DCCGG1011.0[m]DCCGG1020.0[m]DCCGG1029.0[m]DCCGG1038.0[m]DCCGG1046.0[m]DCCGG1056.0[m]DCCGG1065.0[m]DCCGG1077.0[m]DCCGG1095.0[m]DCCGG1113.0[m]DCCGG1131.0[m]DCCGG1149.0[m]DCCGG1158.0[m]DCCGG1167.0[m]DCCGG1176.0[m]DCCGG1185.0[m]DCCGG1194.0[m]DCCGG1203.0[m]DCCGG1212.0[m]DCCGG1221.0[m]DCCGG1230.0[m]DCCGG1239.0[m]DCCGG1266.0[m]DCCGG1293.0[m]DCCGG1320.0[m]DCCGG1347.0[m]DCCGG1374.0[m]DCCGG1401.0[m]DCCGG1428.0[m]DCCGG1455.0[m]DCCGG1482.0[m]DCCGG1509.0[m]DCCGG1536.0[m]DCCGG1563.0[m]DCCGG1590.0[m]DCCGG1617.0[m]DCCGG1644.0[m]DCCGG1671.0[m]DCCGG1698.0[m]DCCGG1725.0[m]DCCGG1752.0[m]DCCGG1779.0[m]DCCGG1806.0[m]DCCGG1833.0[m]DCCGG1860.0[m]DCCGG1887.0[m]DCCGG1914.0[m]DCCGG1941.0[m]DCCGG1968.0[m]DCCGG1995.0[m]DCCGG2022.0[m]DCCGG2049.0[m]DCCGG2076.0[m]DCCGG2103.0[m]DCCGG2130.0[m]DCCGG2157.0[m]DCCGG2184.0[m]DCCGG2211.0[m]DCCGG2238.0[m]DCCGG2265.0[m]DCCGG2631.4[m]SWCCGG2790.0[m]DCCGG2826.0[m]DCCGG2871.0[m]DCCGG2898.0[m]DCCGG2925.0[m]DCCGG2952.0[m]DCCGG2969.0[m]SWCCGG2991.0[m]DCCGG3018.0[m]DCCGG3045.0[m]DCCGG3072.0[m]DCCGG3099.0[m]DCCGG3126.0[m]DCCGG3153.0[m]DCCGG3180.0[m]DCCGG3195.0[m]SWCCGG3222.0[m]DCCGG3249.0[m]DCCGG3276.0[m]DCCGG3303.0[m]DCCGG3330.0[m]DCCGG3357.0[m]DCCGG3381.0[m]DCCGG3408.0[m]DCCGG3431.0[m]SWCCGG3444.0[m]DCCGG3471.0[m]DCCGG3498.0[m]DCCGG3525.0[m]DCCGG3552.0[m]DCCGG3579.0[m]DCCGG3606.0[m]DCCGG3633.0[m]DCCGG3650.0[m]SWCCGG3669.0[m]DCCGG3696.0[m]DCCGG3723.0[m]DCCGG3744.0[m]SWCCGG3768.0[m]DCCGG3795.0[m]DCCGG3822.0[m]DCCGG3848.0[m]SWCCGG3858.0[m]SWCCGG3869.4[m]SWCCGG3880.0[m]SWCCGG3903.0[m]DCCGG3930.0[m]DCCGG3957.0[m]DCCGG3979.0[m]SWCCGG4000.0[m]SWCCGG4017.0[m]DCCGG4044.0[m]DCCGG4062.5[m]SWCCGG4071.3[m]SWCCGG4087.5[m]SWCCGG4112.5[m]SWCCGG4130.0[m]DCCGG4145.0[m]SWCCGG4173.0[m]DCCGG4199.0[m]SWCCGG4224.0[m]DCCGG4251.0[m]DCCGG4270.2[m]SWCCGG4284.0[m]DCCGG4300.0[m]DCCGG