35/9-7
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General information
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Wellbore history
GeneralWell 35/9-7 was drilled on the Skarfjell prospect on the Ryggsteinen Ridge, about 17 kilometres southwest of the Gjøa field in the North Sea. The purpose of the well was to prove petroleum in Late Jurassic reservoir rock.Operations and resultsWildcat well 35/9-7was spudded with the semi-submersible installation Songa Delta on 28 February 2012 and drilled to TD at 3006 m in the Middle Jurassic Rannoch Formation. No significant problem was encountered in the operations. The well was drilled with spud mud down to 600 m and with Aquadril mud from 600 m to TD.Two Intra Heather Formation Sandstones were penetrated: an Oxfordian age sandstone at 2621 m to 2690 m (Intra Heather Sandstone 2) and a Bathonian-Callovian age sandstone at 2776 m to 2790 m (Intra Heather Sandstone 1). The total net reservoir in the two sandstone intervals is 54.2 m. Both reservoirs were filled with light oil in oil down-to settings. The densities of the oils are slightly different but the two columns fall on a common pressure gradient within one bar discrepancy. The overpressure at top reservoir is 16.7 bar. The Sandstones in the Brent Group were found water bearing with a hydrostatic pressure gradient.Three cores were cut from core point 2628 m in the Intra Heather Sandstone 2 to 2706 m the underlying Heather Formation shales. The Intra Heather Sandstone 1 was not cored. Twelve single phase samples were acquired. Seven oil samples were collected from the Intra Heather Sandstone 2, at depths 2626.2 m, 2635.2 m, 2664.1 m, and 2687.7 m; four oil samples were collected from the Intra Heather Sandstone 1 at depths 2776.7 m and 2783.7 m; and one water sample was collected from the Etive Formation at 2968.4 m.The well was permanently abandoned on 14 April 2012 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]610.003006.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12628.02655.2[m ]22655.22681.5[m ]32681.52705.2[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]77.2Cores 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 availableMDT2776.700.00OIL30.03.2012 - 00:00NOMDT0.002635.20OIL30.03.2012 - 00:00YES -
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 typeCONDUCTOR30452.236457.00.00SURF.COND.20597.026600.01.61LOTPILOT HOLE600.09 7/8600.00.00INTERM.13 3/81351.017 1/21358.01.65FITINTERM.9 5/82445.012 1/42450.01.59LOTOPEN HOLE3006.08 1/23006.00.00 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]GR PCOR25972909GR VSP18502975LWD - CB26282706LWD - DIR PWD397600LWD - GR RES PWD DIR397600LWD - GR RES PWD DIR SON6001358LWD - GR RES PWD DIR SON DEN NEU13582450LWD - NBRES GR RES PWD DIR24542628LWD - NBRES GR RES PWD DIR27063006MLL PTEX XMAC ORIT CDL CN DSL TT2003005RCI IFX 6TC GR TTRM26232970STAR ORIT DSL TTRM26103005XMAC MREX GR TTRM26103005 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit39764370670610071081110812471288128813371364173717601767176718952482254025842584259425942610262126902776279029112911292229532974 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured4201.49Spud Mud5971.1818.0Aquadrill Mud6001.49Kill Mud6001.49Spud Mud8391.2216.0Aquadrill Mud13581.3119.0Aquadrill Mud24351.3118.0Aquadrill Mud24501.3122.0Aquadrill Mud26931.3222.0Aquadrill Mud30061.3121.0Aquadrill