6307/1-1 S
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General information
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Wellbore history
GeneralWell 6307/1-1 S was drilled to test the Silfari prospect in the Froan Basin in the Norwegian Sea. The primary exploration target for the well was to investigate the reservoir properties and the petroleum potential in Permian carbonate rocks (equivalent to the Wegner Halvø formation in the Late Permian at East Greenland). The secondary exploration target was to collect data for potential reservoirs in the Middle to Early Jurassic (the Fangst and Båt groups).Operations and resultsWildcat well 6307/1-1 S was spudded with the semi-submersible installation Leiv Eiriksson on 18 October 2018 and drilled to TD at 4114 m in igneous rocks. Operations proceeded without significant problems. The well was drilled with seawater and hi-vis pills down to 329 m, with KCl/Polymer/GEM water-based mud from 329 to 923 m, with Baracarb High Performance water-based mud from 923 to 3119 m and with Baracarb HTHP water-based mud from 3119 m to TD.The well encountered good reservoir sands in the targeted Jurassic formation but with no hydrocarbon indications. Pressure data showed a clear water gradient of 1.02 g/cc. in the Jurassic. The well penetrated top Triassic Grey Beds at 2775 m (2610.3 m TVD) and top Red Beds at 2839 m (2665.7 m TVD). The deepest section below 3385 m (3146.5 m TVD) consists of undated igneous rocks. The deep Permian target was thus not present, and no hydrocarbons were present in these rocks.Numerous weak oil shows in the form of visible and/or fluorescing cut were recorded in the well, beginning at 1811 m in the Lange formation. The shows may have been influenced by mineral fluorescence and mud type.One core was cut from 3473 to 3482.6 m with 55.2 % recovery. The core to log depth shift is 0.4 m. MDT water samples were taken at 2131.59 m.The well was permanently abandoned on 28 December 2018 as a dry 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]340.004114.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom13473.03478.3[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]5.3Cores 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 typeCONDUCTOR30328.842328.80.00PILOT HOLE621.09 7/8621.00.00SURF.COND.20915.026923.01.56LOTINTERM.13 3/81756.917 1/21765.01.78LOTINTERM.9 7/83112.312 1/43119.01.86LOTOPEN HOLE4114.08 1/24114.00.00 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CMR NEXT XPT17773087FMI MSIP17563120FMI MSIP29604115HRLA PEX HNGS9151758HRLA PEX HNGS17563080HRLA PEX HNGS31124107MDT21312131MSCT13171667MSCT18073076MSCT19842382MWD LWD - GR PWD RES DIR AC296914MWD LWD - PWD GR DIR249328MWD LWD - RES GR PWD CAL DEN N A16844113MWD LWD - RES INC GR PWD DIR AC8601765VSI25414100VSP12003075XLR31544090XLR33123709XPT NEXT CMR31124105 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit2622623085375371034103411471345136613661421153016501672167218091845184518722080208021092109212621842227228123252433277528393385 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured2351.2015.0KCL/Gem2611.5030.0KCL/Gem6201.03Sea water7251.4527.0HT WBM7631.2418.0KCL/Gem/Polymer8851.4526.0High Performance WBM9231.4530.0High Performance WBM9231.2618.0KCL/Gem/Polymer11401.4525.0High Performance WBM16771.4525.0High Performance WBM17651.3927.0High Performance WBM17651.4523.0High Performance WBM20511.4027.0High Performance WBM22921.3929.0High Performance WBM24321.4027.0High Performance WBM25401.3929.0High Performance WBM28861.4525.0HT WBM28861.3018.0HT WBM29691.3929.0High Performance WBM31191.3020.0HT WBM31191.4020.0High Performance WBM41131.3018.0HT WBM