30/3-5 S
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General information
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Wellbore history
GeneralWell 30/3-5 S was drilled on the G prospect, which lies to the east of the Veslefrikk Field. The main target was the Brent Group with Early Jurassic Statfjord Group as a secondary target. The well was designed to be completed as an oil producer on the G prospect.Operations and resultsWell 30/3-5 S was spudded through slot 6 on the fixed installation Veslefrikk A on 1 May 1992 and drilled to TD at 4724 m (3340 m TVD) in the Early Jurassic Statfjord Group. Severe doglegs and ledging in the well path created problems in the 24" section from 472 to 1409 m. An attempt to reach an additional target in the Statfjord Formation failed due to problems with directional drilling. The well was drilled with gypsum/PAC mud down to 2551 m and with oil based mud from 2551 m to TD.The planned targets were reached. The top of the Brent Group was penetrated at 4050 m, 8 m vertically deeper than prognosed. As expected, a fully developed Brent Group was present in the well. Apart from the Amundsen Formation, which came in 3.5 m shallower than prognosed, the formation tops came in slightly deeper than prognosed. The well proved hydrocarbons in the Brent Group and in the Cook Formation of the Dunlin Group. Differential pressure depletion was observed in some zones of the Brent Formation, attributed to communication with the main Veslefrikk Field which has been in production since 1989. The Statfjord Group had shows in the uppermost part. Rare, weak shows were seen in limestones and siltstones in the Shetland Group. No other shows were reported outside the reservoir section.Five cores were cut. Cores 1 to 3 were cut from 4060 to 4160 m in the Ness-Etive-Rannoch-Oseberg formations, core 4 was cut from 4168 to 4213 m in the Oseberg Formation, and core 5 was cut from 4429 to 4446 m in the Cook Formation. All cores had significant positive depth shifts compared to logs; 5.5 m, 5.0 m, 5.5 m, 7.0 m, and 6.0 m respectively for cores 1 to 5. RFT fluid samples were taken at 4222 m and at 4426 m.The well was completed on 19 June 1992 as an oil appraisal well. It was converted to development well 30/3-A-14.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]480.004710.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom14060.04066.0[m ]24076.04107.7[m ]34108.04160.8[m ]44168.04213.1[m ]54429.04445.6[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]152.1Cores 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 typeCONDUCTOR26463.030464.00.00LOTINTERM.201153.0241409.01.65LOTINTERM.13 3/82548.017 1/22551.01.94LOTINTERM.9 5/83955.012 1/43956.01.62LOTLINER74530.08 1/24724.00.00LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]BHC GR39664060BHC GR39664535CBL VDL GR37804530DITE BHC LDT CNT GR AMS38704335MWD DPR - GR39564710RFT HP GR AMS40534438RFT HP GR AMS44224422RFT HP GR AMS44264426VSP35404480 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit231807102725602560267427173004378740504050405941274142415542434243442444944538 -
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]pdf0.88pdf5.66 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured5101.1211.0water based8871.1812.0water based13271.2018.0water based14091.2015.0water based17521.3923.0water based19751.6030.0water based25241.6235.0water based25511.6147.0oil based26971.6235.0oil based30341.6235.0oil based32961.6259.0oil based36791.6150.0oil based39561.5535.0oil based40271.2024.0oil based42361.2327.0oil based47241.2328.0oil based