3/7-5
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General information
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Wellbore history
GeneralWell 3/7-5 was drilled on the Lemen structure, a fault bounded, salt induced trap located in the centre of the Søgne Basin in the North Sea. The Primary objective of the well was to test sandstones of the Sandnes and Bryne Formations. Secondary objectives were to evaluate the prospectivity of other possible reservoir levels (Late Cretaceous Chalk and Paleocene sandstones) within structural closure and thereby evaluate the charge potential of the local Søgne Basin hydrocarbon kitchen.Operations and resultsWildcat well 3/7-5 was spudded with the semi-submersible installation Dyvi Stena on 6 December 1991 and drilled to TD at 3666 m (3637.8 m TVD) in the Late Permian Zechstein Group. The well was drilled efficiently, but some problems with deviation and logging was encountered. The hole was practically vertical down to TD in the 12 1/4" section at 3085. The 8 1/2" section was however drilled with close to 20 deg deviation all through to TD, leading to ca 27 m difference between measured and true vertical depth at final TD. Due to hole problems no wire line logs were run between 2198 m and 3085 m in the 12 1/4" section. The 8 1/2" section was eventually logged to 3575 m, 90 m above final TD, but only after several logging attempts and a check trip. The well was drilled with spud mud and viscous pills down to 610 m, and with seawater/gypsum/polymer mud from 610 m to TD.Above the objective Sandnes / Bryne formations there were no evidence of producible hydrocarbons, although it should be stated that this could not be completely confirmed by logs because a significant section could not be logged with wire line logs. Top Sandnes Formation was encountered at 3379 m and top Bryne Formation at 3436 m. FMT pressure plot indicated a water gradient throughout the Sandnes / Bryne reservoir. Petrophysical evaluation gave no indications of hydrocarbons in the cleaner parts of the reservoir but, there was some indication of (residual) oil of low saturation in the shalier sections.No shows were reported in the samples above 3244 m in the Haugesund Formation, where a pale yellow solvent fluorescence was seen in silty claystones and sandstone stringers. The core cut in the Sandnes Formation sandstone was reported to contain some dead oil with a weak crush cut fluorescence. No direct fluorescence was seen in the core. Brownish-yellow cut fluorescence was reported on sidewall cores in Middle Jurassic siltstones and sandstones.A core was taken from 3383 m to 3393 m in the top part of the Sandnes Formation. A segregated formation fluid sample was taken at a depth of 3390.5 m.The well was permanently abandoned on 7 February 1992 as a dry well with shows.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]620.003666.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom13383.03392.1[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]9.1Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
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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 typeCONDUCTOR30153.036155.00.00LOTINTERM.20601.026615.01.49LOTINTERM.13 3/81716.017 1/21730.01.84LOTINTERM.9 5/83075.012 1/43090.01.96LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]AC18213071AC SIG18213071CBL5231716DIFL AC SP GR CAL5501685DIFL AC SP GR CAL30753575DIFL BHC AC GR16252195DIP GR30743550DLL MLL CAL GR30453530FMT GR33823445SP30743542SWS GR6341664SWS GR17372012SWS GR30863442SWS GR30923613VSP10003555ZDL CN GR CAL5501685ZDL CN GR CAL30743543 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit9112582654265426682679271127112800291230443044304830503058308530853379337934363609 -
Geochemical information
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Documents – reported by the production licence (period for duty of secrecy expired)
Documents – reported by the production licence (period for duty of secrecy expired) Document nameDocument formatDocument size [MB]pdf47.07 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured6101.03WATER BASED6821.2568.0WATER BASED9141.3054.0WATER BASED11861.3051.0WATER BASED15461.3059.0WATER BASED17251.3058.0WATER BASED27371.4356.0WATER BASED27811.4861.0WATER BASED30401.5162.0WATER BASED30851.5670.0WATER BASED30851.5667.0WATER BASED31991.5065.0WATER BASED32711.5058.0WATER BASED33371.5558.0WATER BASED33371.5063.0WATER BASED35081.5761.0WATER BASED36661.6052.0WATER BASED -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory3300.0[m]DCAPT3312.0[m]DCAPT3321.0[m]DCAPT3330.0[m]DCAPT3336.0[m]DCAPT3342.0[m]DCAPT3348.0[m]DCAPT3354.0[m]DCAPT3360.0[m]DCAPT3366.0[m]DCAPT3372.0[m]DCAPT3378.0[m]DCAPT3382.2[m]CAPT3383.8[m]CAPT3384.0[m]DCAPT3384.8[m]CAPT3385.9[m]CAPT3386.3[m]CAPT3386.7[m]CAPT3387.5[m]CAPT3388.4[m]CAPT3390.0[m]DCAPT3392.2[m]CAPT3393.0[m]DCAPT