6604/10-1
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General information
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Wellbore history
GeneralWell 6604/10-1 was drilled to appraise the 6603/12-1 Gro gas discovery in the Vigrid Syncline in the Vøring Basin of the Norwegian Sea. Before 6604/10-1 was drilled, resource estimates for the discovery were between 10 and 100 billion standard cubic metres (Sm3) of recoverable gas.Operations and resultsAppraisal well 6604/10-1 was spudded with the semi-submersible installation Aker Barents on 26 May 2010 and drilled to TD at 3715 m in the Late Cretaceous Springar Formation. No pilot hole was drilled and no shallow gas or shallow water flow was encountered in this well, as predicted. When running the BOP a leak in the mini connector on choke line was discovered. The well was suspended for seven days while this was repaired. The well was drilled with seawater and hi-vis pills down to 2320 m, with Glydril mud from 2320 m to 2848 m, and with Paratherm oil based mud from 2848 m to TD.The well penetrated rocks of Quaternary, Tertiary and Cretaceous age. Top Maastrichtian Springar reservoir came in at 3597.2 m, 36.8 m shallower than the pre-drill prediction. Based on poor MDT pressure data it appears that the upper reservoir unit (3597 - 3616 m) and the middle reservoir unit (3616 - 3626 m) are different pressure regimes. No valid pressures were obtained in the lower unit (3626 - 3648 m). After analysing the acquired data it was concluded that the upper interval of the Springar reservoir was gas bearing. The reservoir quality was in general very poor, apart from a short section near the very top. No staining or fluorescence on cuttings was detected throughout the 6604/10-1 well. The hydrocarbon core scanner detected "heavy oil" between 3601 and 3621, but this is not confirmed by other data. The well was re-classified as a wildcat well, as it proved two minor deposits which are not in communication with 6603/12-1 Gro gas discovery.One 54 m core was taken from the reservoir interval 3601.4 to 3655.4 m (3598.8 to 3652.8 m wire line depth) with 100% recovery. An extensive wire line program was successfully carried out after reaching TD. Two MDT runs were made and only two valid and three slightly supercharged pressure points out of 35 tests were obtained. MDT fluid samples were taken at 3601.8 m (gas), 3613.0 m (gas/water), and at 3617 m (gas/water/filtrate). PVT analyses of the gas samples show a higher liquid content than in the 6603/12-1 gas, but it is not possible to exclude OBM contamination as the cause of this difference.The well was permanently abandoned on 3 September 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]2335.003715.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom13601.43655.3[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]53.9Cores 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 typeCONDUCTOR361465.0421466.00.00LOTSURF.COND.202320.0262326.01.28LOTINTERM.13 3/82848.017 1/22855.01.27LOTLINER9 5/83468.012 1/43470.01.39LOTOPEN HOLE3715.08 1/23715.00.00LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]AIT DSI PPC23203711HNGS PEX34503711MDT DP GR36133617MDT GR36013617MR SCANN35913675MWD ARC14662856MWD ARC36563715MWD ARC RAB34703601MWD ARC SON VISION28563470VSP14003702 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit138513851578207520752673267329503371337135973645 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured14191.02Other23261.12Glydril23261.12Glydril23261.39PAD28551.17Glydril28551.21Glydril28551.21Glydril28551.17Glydril33201.22Paratherm34701.25Paratherm34701.25Paratherm35201.31Paratherm36011.28Paratherm37151.18Glydril37501.17Glydril -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory2695.0[m]DCPETROSTA2715.0[m]DCPETROS2745.0[m]DCPETROS2805.0[m]DCPETROS2825.0[m]DCPETROS2845.0[m]DCPETROS2875.0[m]DCPETROS2945.0[m]DCPETROS2965.0[m]DCPETROS2985.0[m]DCPETROS3005.0[m]DCPETROS3025.0[m]DCPETROS3045.0[m]DCPETROS3065.0[m]DCPETROS3075.0[m]DCPETROS3095.0[m]DCPETROS3115.0[m]DCPETROS3135.0[m]DCPETROS3155.0[m]DCPETROS3175.0[m]DCPETROS3195.0[m]DCPETROS3215.0[m]DCPETROS3235.0[m]DCPETROS3265.0[m]DCPETROS3285.0[m]DCPETROS3305.0[m]DCPETROS3325.0[m]DCPETROS3345.0[m]DCPETROS3470.0[m]DCPETROS3480.0[m]DCPETROS3490.0[m]DCPETROS3495.0[m]DCPETROS3505.0[m]DCPETROS3510.0[m]DCPETROS3515.0[m]DCPETROS3525.0[m]DCPETROS3530.0[m]DCPETROS3540.0[m]DCPETROS3545.0[m]DCPETROS3550.0[m]DCPETROS3555.0[m]DCPETROS3575.0[m]DCPETROS3603.0[m]CPETROS3605.0[m]CPETROS3605.4[m]CPETROS3607.8[m]CPETROS3608.6[m]CPETROS3611.8[m]CPETROS3614.9[m]CPETROS3616.6[m]CPETROS3618.2[m]CPETROS3618.5[m]CPETROS3618.7[m]CPETROS3618.9[m]CPETROS3621.5[m]CPETROS3624.9[m]CPETROS3625.1[m]CPETROS3628.7[m]CPETROS3628.8[m]CPETROS3630.3[m]CPETROS3633.3[m]CPETROS3637.8[m]CPETROS3639.5[m]CPETROS3640.8[m]CPETROS3642.8[m]CPETROS3643.5[m]CPETROS3644.8[m]CPETROS3648.2[m]CPETROS3648.9[m]CPETROS3649.4[m]CPETROS3650.6[m]CPETROS3651.5[m]CPETROS3652.5[m]CPETROS3653.5[m]CPETROS3654.5[m]CPETROS3660.0[m]DCPETROS3665.0[m]DCPETROS3670.0[m]DCPETROS3675.0[m]DCPETROS3680.0[m]DCPETROS3685.0[m]DCPETROS3690.0[m]DCPETROS3695.0[m]DCPETROS3700.0[m]DCPETROS3705.0[m]DCPETROS3710.0[m]DCPETROS3715.0[m]DCPETROS