7120/8-4
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General information
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Wellbore history
Well 7120/8-4 was drilled on the Askeladd Beta prospect in block 7120/8 about 6 kilometres south-west of the Snøhvit field and 150 kilometres north-west of Hammerfest. The purpose of the well was to prove hydrocarbons in Jurassic sandstones as additional resources for a potential expansion of the LNG plant on Melkøya.Operations and resultsA 9 7/8" pilot hole (7120/8-U-4) was first drilled to 500 m to detect possible shallow gas in a zone at 370 m. No shallow gas was detected. Wildcat well 7120/8-4 was spudded with the semi-submersible installation Polar Pioneer on 14 November 2007 and drilled to TD at 2697 m in the Late Triassic Fruholmen Formation. Boulders were encountered in the 36" top hole section. No significant problems were encountered during the operations. The well was drilled with spud mud/high viscosity sweeps and returns to seafloor down to 1246 m and with Formpro WBM from 1246 m to TD.Top Stø and Tubåen Formations were penetrated at 2263.8 and 2495.7 m respectively. The well was dry, with only traces of hydrocarbons. However, in the Stø and Fruholmen Formations significant background gas and residual oil from the interpretation shows that this structure might have been hydrocarbon filled formerly. The presence of kerogens in the Stø Formation gave a general spotty direct HC fluorescence and a weak cut reaction (with 2-iso-proponol) in zones rich in siltstones or in some of the zones packed with kaolinittic matrix/cement. One particular stringer of calcareous sandstone, at 2325 ? 2332 m, gave a particular good HC-fluorescence as well as the cut reaction. The appearance of fluorescence was generally absent below 2523 m.No cores were cut and no wire line fluid samples were taken.The well was permanently abandoned on 10 December 2007 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]1260.002697.00 -
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 typeCONDUCTOR30346.036351.01.65LOTINTERM.13 3/81244.017 1/21252.02.05LOTINTERM.9 5/82249.012 1/42250.00.00LOTOPEN HOLE2697.08 1/22697.00.00LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]MDT PRETEST22652678MWD - ARCVRES8-POWERPULSE3511252MWD - GVR6-ARCVRES6 POWERPULSE22502697MWD - GVR8 ARCVRES8 POWERPULSE12522250MWD - POWERPULSE275351PEX HNGS MSIP12502697VSP3472680 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit298376376118611861279127917982142217921792221225022642264236024962643 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.30 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured15281.2615.0FORMPRO19491.2615.0FORMPRO22501.3016.0FORMPRO22621.3020.0FORMPRO -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory1260.0[m]DCAPT1280.0[m]DCAPT1300.0[m]DCAPT1320.0[m]DCAPT1340.0[m]DCAPT1360.0[m]DCAPT1380.0[m]DCAPT1400.0[m]DCAPT1420.0[m]DCAPT1440.0[m]DCAPT1460.0[m]DCAPT1480.0[m]DCAPT1500.0[m]DCAPT1520.0[m]DCAPT1540.0[m]DCAPT1560.0[m]DCAPT1580.0[m]DCAPT1600.0[m]DCAPT1620.0[m]DCAPT1640.0[m]DCAPT1660.0[m]DCAPT1680.0[m]DCAPT1700.0[m]DCAPT1720.0[m]DCAPT1740.0[m]DCAPT1760.0[m]DCAPT1780.0[m]DCAPT1800.0[m]DCAPT1820.0[m]DCAPT1840.0[m]DCAPT1860.0[m]DCAPT1880.0[m]DCAPT1900.0[m]DCAPT1920.0[m]DCAPT1940.0[m]DCAPT1960.0[m]DCAPT1980.0[m]DCAPT2000.0[m]DCAPT2020.0[m]DCAPT2040.0[m]DCAPT2060.0[m]DCAPT2080.0[m]DCAPT2100.0[m]DCAPT2110.0[m]DCAPT2120.0[m]DCAPT2130.0[m]DCAPT2140.0[m]DCAPT2150.0[m]DCAPT2160.0[m]DCAPT2170.0[m]DCAPT2180.0[m]DCAPT2190.0[m]DCAPT2200.0[m]DCAPT2210.0[m]DCAPT2220.0[m]DCAPT2230.0[m]DCAPT2240.0[m]DCAPT2250.0[m]DCAPT2256.0[m]DCAPT2262.0[m]DCAPT2268.0[m]DCAPT2274.0[m]DCAPT2280.0[m]DCAPT2286.0[m]DCAPT2292.0[m]DCAPT2298.0[m]DCAPT2304.0[m]DCAPT2310.0[m]DCAPT2316.0[m]DCAPT2322.0[m]DCAPT2328.0[m]DCAPT2334.0[m]DCAPT2340.0[m]DCAPT2346.0[m]DCAPT2352.0[m]DCAPT2358.0[m]DCAPT2364.0[m]DCAPT2370.0[m]DCAPT2376.0[m]DCAPT2382.0[m]DCAPT2394.0[m]DCAPT2412.0[m]DCAPT2418.0[m]DCAPT2430.0[m]DCAPT2436.0[m]DCAPT2454.0[m]DCAPT2460.0[m]DCAPT2466.0[m]DCAPT2472.0[m]DCAPT2478.0[m]DCAPT2484.0[m]DCAPT2490.0[m]DCAPT2496.0[m]DCAPT2502.0[m]DCAPT2508.0[m]DCAPT2514.0[m]DCAPT2526.0[m]DCAPT2532.0[m]DCAPT2538.0[m]DCAPT2544.0[m]DCAPT2550.0[m]DCAPT2556.0[m]DCAPT2562.0[m]DCAPT2574.0[m]DCAPT2586.0[m]DCAPT2592.0[m]DCAPT2598.0[m]DCAPT2610.0[m]DCAPT2622.0[m]DCAPT2628.0[m]DCAPT2640.0[m]DCAPT2652.0[m]DCAPT2658.0[m]DCAPT2664.0[m]DCAPT2670.0[m]DCAPT2676.0[m]DCAPT2682.0[m]DCAPT2688.0[m]DCAPT2697.0[m]DCAPT