6406/2-8
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General information
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Wellbore history
GeneralWell 6406/2-8 was drilled to test the Imsa prospect on the Halten Terrace in the Norwegian Sea. The primary objective was to prove commercial volumes of movable hydrocarbons in Jurassic sandstones of the Garn-, Ile- Tofte- and Tilje formations.Operations and resultsWildcat well 6406/2-8 was spudded with the semi-submersible installation Transocean Arctic on 17 January 2015 and drilled to TD at 4680 m in Triassic sediments belonging to the Åre Formation. As much as 37 days was counted as WOW for this well (31% of the rig time). Otherwise, no significant problem was encountered in the operations. Log data quality is an issue in the 8.5" section, there is strong effects from stick & pull on the logging sensors. The well was drilled with Seawater and hi-vis pills down to 404 m, with KCI/Polymer/GEM mud from 404 m to 1610 and with XP-07 oil based mud from 1610 m to TD.In the Lysing and Lange formations hydrocarbons (most likely gas) were found in primarily tight sandstones of poor quality. In total 4.5 m Cretaceous hydrocarbon pay was identified, consisting of several thin sandstones. Below BCU, a thin Spekk Formation rested directly on the lower part of the Tilje Formation. The Garn, Ile, and Tofte formations were eroded in the well. Light oil was found in the Tilje and Åre formations, from 4307.5 m down to the OWC at 4424.3 m. The reservoir quality in the Jurassic targets varied from medium to poor.One core was cut with 100% recovery from 4340 to 4357.50 m. Fluid samples were taken at 4344.75 m (light oil), 4419.74 (light oil), 4430 m (water), and 4501 m (water)The well was permanently abandoned on 5 May 2015 as an oil 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]1620.004681.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom14340.04357.9[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]17.9Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Oil samples at the Norwegian Offshore Directorate
Oil samples at the Norwegian Offshore Directorate Test typeBottle numberTop depth
MD [m]Bottom depth
MD [m]Fluid typeTest timeSamples availableDST4345.000.00OILYES -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit2862865901590193319332470247025372597259727162876343834383531427042994299430843084331 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL31504100FMP FMS43094653GR DI2004670LWD-DIR GR RES ND NBGR NBRES PWD42294340LWD-DIR GR RES ND PWD43574680LWD-DIR GR RES ND SON PWD25694229LWD-DIR GR RES PWD4041610LWD-DIR GR RES SON PWD16102569LWD-PWD25692569SL MR40504679SLAM ACI42004670SWC43094440VSP11584668 -
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 typeCONDUCTOR30401.036404.00.00PILOT HOLE857.012 1/4857.00.00SURF.COND.201603.0261610.00.00INTERM.13 3/82561.517 1/22569.01.74LOTINTERM.9 7/84223.012 1/44229.01.96FITOPEN HOLE4680.08 1/24680.02.15LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured4041.3123.0KCL/Polymer/GEM6671.3329.0KCL/Polymer/GEM8571.2933.0KCL/Polymer/GEM11271.3330.0KCL/Polymer/GEM13791.6433.0XP-07 Low ECD OBM14661.3326.0KCL/Polymer/GEM15101.6435.0XP-07 Low ECD OBM15151.6438.0XP-07 Low ECD OBM15191.8032.0XP-07 Low ECD OBM16101.3320.0KCL/Polymer/GEM16131.5434.0XP07 Low ECD OBM24951.6448.0XP07 Low ECD OBM25711.7944.0XP07 Low ECD OBM31271.8053.0XP07 Low ECD OBM41301.9947.0XP-07 Low ECD OBM42161.8040.0XP-07 Low ECD OBM43201.8745.0XP-07 Low ECD OBM43571.9548.0XP-07 Low ECD OBM46801.9641.0XP-07 Low ECD OBM