34/8-18 S
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General information
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Wellbore history
GeneralWell 34/8-18 S was drilled on a highly tilted fault block downfaulted east of the Visund Main Field on Tampen spur in the North Sea. The primary objective of the well was to prove petroleum in the Telesto prospect in Early Jurassic reservoir rocks (the Statfjord group).Operations and resultsWildcat well 34/8-18 S was drilled from the Visund platform, as a side-track to oil producer 34/8-A-36 H. It was kicked off below the 9 5/8” shoe at 3619 m in the Shetland Group on 9 February 2019. It was drilled with an 8 1/2” bit, in one bit run, all through to TD at 6068 m (3327 m TVD) m in the Late Triassic Lunde Formation. The well was drilled highly deviated (ca 87° inclination through most of Shetland Group). Operations proceeded without significant problems. The well was drilled with RheGuard oil-based mud from kick-off to TD.The well drilled ca 3 km of Shetland Group before Cromer Knoll came in at 5679 m and a thin Viking Group at 5692 m. The whole of Brent Group and the upper part of the Dunlin Group was eroded in-well. Top Statfjord Group was penetrated at 5769 m (3082 m TVD). The well encountered a gross oil column of about 115 metres in the upper and lower part of the Statfjord group, with effective reservoir of 17 and 20 metres, respectively, in sandstone mainly with moderate reservoir quality. Pressure data showed initial pressure in the reservoir sands, but the HC filled reservoir in the lower Statfjord had slightly higher pressure (ca 5 bar) than the upper Statfjord. Observations showed a contact in upper Statfjord at 5849 m (3139 m TVD), and an oil-down-to/water-up-to at 5916.5/ 5925 m (3193/3200 m TVD) in lower Statfjord . In the upper part of the Lunde formation, about 15 metres of water-bearing sandstone with poor reservoir quality was encountered. No shows were recorded in the wellNo cores were cut. No fluid sample was taken.The well was plugged on 22 February as an oil discovery.TestingNo drill stem test was performed. -
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 typeCONDUCTOR36438.042454.00.00SURF.COND.201338.1261349.01.60FITINTERM.13 3/82408.517 1/22420.01.66FITLINER9 5/83617.212 1/43619.01.85FITOPEN HOLE6068.08 1/26068.00.00 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]MWD LWD - GR365454MWD LWD - GR RES4543617MWD LWD - GR RES DEN NEU CAL SON36196068 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit364100814472060206021362200243556795692569256955706576960016001 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured56271.7049.0RheGuard58031.7048.0RheGuard60681.7057.0RheGuard -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory5650.0[m]DCPETROS5660.0[m]DCPETROS5670.0[m]DCPETROS5680.0[m]DCPETROS5685.0[m]DCPETROS5690.0[m]DCPETROS5695.0[m]DCPETROS5700.0[m]DCPETROS5705.0[m]DCPETROS5710.0[m]DCPETROS5715.0[m]DCPETROS5725.0[m]DCPETROS5735.0[m]DCPETROS5745.0[m]DCPETROS5755.0[m]DCPETROS5760.0[m]DCPETROS5765.0[m]DCPETROS5770.0[m]DCPETROS5775.0[m]DCPETROS5780.0[m]DCPETROS5785.0[m]DCPETROS5790.0[m]DCPETROS5800.0[m]DCPETROS5810.0[m]DCPETROS5820.0[m]DCPETROS5830.0[m]DCPETROS5840.0[m]DCPETROS5850.0[m]DCPETROS5860.0[m]DCPETROS5870.0[m]DCPETROS5880.0[m]DCPETROS5890.0[m]DCPETROS5900.0[m]DCPETROS5910.0[m]DCPETROS5920.0[m]DCPETROS5930.0[m]DCPETROS5940.0[m]DCPETROS5950.0[m]DCPETROS5960.0[m]DCPETROS5970.0[m]DCPETROS5980.0[m]DCPETROS5990.0[m]DCPETROS6000.0[m]DCPETROS6010.0[m]DCPETROS6020.0[m]DCPETROS6030.0[m]DCPETROS6040.0[m]DCPETROS6050.0[m]DCPETROS6060.0[m]DCPETROS6068.0[m]DCPETROS