7122/7-6
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General information
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Wellbore history
GeneralWell 7122/7-6 was drilled as an appraisal well on the Goliat Field in the Barents Sea. The primary objective was to define the Kobbe M0 compartment prior to drilling of the M0 development wells. The well should also reduce the structural uncertainty and give information about the OWC and GOC of the Kobbe Main Compartment. The secondary objectives were to test the hydrocarbon potential of the Realgrunnen Subgroup and the Snadd Formation.Operations and resultsA 9 7/8” pilot hole was spudded 50 m away from the main well location and drilled to 680 m. No shallow gas or water flow was observed and the pilot was plugged back to seabed. Appraisal well 7122/7-6 was spudded with the semi-submersible installation Scarabeo 8 on 21 October 2012 and drilled to TD at 2026 m in the Early Triassic Klappmyss Formation. The well was drilled with seawater and hi-vis pills down to 562 m and with Glydril/KCl mud from 562 m to TD.Top Fruholmen was penetrated at 1121 m and was oil bearing from top to the OWC at 1162 m. Analysis of the mud gas while drilling (“Gas While Drilling”) show high iC4/n/C4 ratio in the Fruholmen oil due to biodegradation. The Snadd Formation was mainly claystone/siltstone with thin interbedded sandstones. It was water bearing without shows. The Kobbe Formation was encountered at 1754 m and had gas down to the GOC at 1792 m and oil down to the OWC at 1846 m. Diminishing oil shows on SWC’s were described below the Kobbe OWC down to 1900 m.Four cores were cut. Cores 1 and 2 were cut from 1126 to 1163 m in the Fruholmen reservoir. Cores 2 and 4 were cut from 1759 to 1766 m in the Kobbe reservoir. Core recovery was between 90 and 100%. MDT-XPT pressure points were acquired in the Fruholmen and Kobbe reservoirs to establish the fluid gradients and contacts. MDT fluid samples were taken in the Fruholmen Formation at 1152 m (oil), 1173 m (water), and in the Kobbe Formation at 1757 m (gas), 1842.5 m (oil), and 1866 m (water).The well was permanently abandoned on 4 January 2013 as an oil and gas appraisal 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]570.002026.40 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom11126.01156.0[m ]21156.01162.8[m ]31759.01760.0[m ]41760.01765.3[m ]51803.01824.7[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]64.9Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit41447847862462464564598010461110112211221208175417541996 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CMR XPT GR10901275CMR XPT GR17202023FMI SON10901660FMI SON GR16512027MDT11521152MDT11731173MDT GR17571848MDT GR18421842MSCT GR19931748MWD - GR CAL ECD RES DEN NEU SON18252026MWD - GR RES ECD471562MWD - GR RES ECD16601803MWD - GR RES NBGR ECD10981126MWD - GR RES NBGR ECD DEN SON NE11261651MWD - GR RES NBGR ECD SON5621098TLD HRLA HNGS00TLD HRLA HNGS EDTC LEHQT10901275USIT GR4141651VSP GR3822000 -
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 typeCONDUCTOR36462.042471.00.00SURF.COND.20550.024562.01.35FITPILOT HOLE681.0681.00.00INTERM.13 3/81090.0161098.01.40FITLINER9 5/81660.012 1/41660.00.00OPEN HOLE2026.08 1/22026.00.00 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured4241.32KC4711.03GE6011.20KC8501.34KC10981.20KC17591.24KC20261.25KC -
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]PDF0.26