2/8-17 A
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General information
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Wellbore history
GeneralExploration well 2/8-17 A is a sidetrack from well 2/8-17 S which drilled a salt induced anticline on the western edge of the Piggvar Terrace 20 km Northeast of the Valhall Field. The decision to drill the sidetrack well was made when well 2/8-17 S was abandoned due to hole problems that prohibited a full evaluation of the structure. The primary objectives of well 2/8-17 A were the Late Cretaceous Ekofisk and Tor chalk Formations, same as in well 2/8-17 S, but it was decided that the sidetrack should evaluate a more down flank element of the Trud prospect than in well 2/8-17 S. Well 2/8-17 A was planned to TD in Permian evaporites immediately underlying the chalk.OperationsExploration well 2/8-17 A was kicked off from 1690 m in well bore 2/8-17 S with the jack-up installation "Transocean Nordic" on 18 January 1998 and drilled to 2838 m where mud losses and circulation problems resulted in lost hole. A technical sidetrack, 2/8-17 A T2, was kicked off from 1952 m in well 2/8-17-A and successfully drilled to target TD at 3145 m (2853 m TVD RKB) in Permian evaporites. The well was drilled with "ANCOVERT" oil based mud from kick-off to TD.The 2/8-17 A T2 well penetrated the Upper Cretaceous Ekofisk and Tor Formations, and a thin Lower Cretaceous interval before reaching TD in the Permian. There were no oil shows and no cores were taken. The Cretaceous interval was evaluated by a comprehensive wire-line logging program, which confirmed the absence of hydrocarbons in comparatively low porosity chalk. No fluid samples were taken. Well 2/8-17 A T2 was permanently abandoned as a dry hole on 21 February 1998.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]1700.002835.00 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit11016272908290829182935294329433019311131113119 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.29 -
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]pdf2.85pdf149.17 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]DCBIL HEXDIP29453140HDIL MAC GR29453145MWD RNT - GR RES DIR19523145RCI GR29563047RCOR29613115VSP9503145ZDEN CN SGR29453145 -
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 typeCONDUCTOR30299.036300.00.00LOTSURF.COND.13 3/8959.017 1/2960.00.00LOTINTERM.9 5/81690.012 1/41690.00.00LOTOPEN HOLE2838.062838.00.00LOTLINER73145.08 1/23145.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured14601.6841.0ANCO VERT17151.7230.0ANCO VERT18571.7230.0ANCO VERT18571.7230.0ANCO VERT21861.8140.0ANCO VERT25291.8142.0ANCO VERT27561.8140.0ANCO VERT27721.7236.0ANCO VERT28381.7641.0ANCO VERT28451.6841.0ANCO VERT29351.8143.0ANCO VERT29461.8140.0ANCO VERT29771.6735.0ANCO VERT31451.6740.0ANCO VERT -
Pressure plots
Pressure plots The pore pressure data is sourced from well logs if no other source is specified. In some wells where pore pressure logs do not exist, information from Drill stem tests and kicks have been used. The data has been reported to the NPD, and further processed and quality controlled by IHS Markit.Pressure plots Document nameDocument formatDocument size [MB]pdf0.21