7324/8-1
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General information
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Wellbore history
GeneralWell 7324/8-1 was drilled on the Wisting Central prospect in the Barents Sea between the Hoop fault complex to the east and the Maud Basin to the west. The primary objective was to evaluate the Jurassic Realgrunnen Subgroup for hydrocarbons.Operations and resultsWildcat well 7324/8-1 was spudded with the semi-submersible installation Leiv Eiriksson on 10 August 2013 and drilled to TD at 930m in the late Triassic(Carnian age) Snadd Formation. A 9 7/8" pilot hole was drilled down to 641 m to check for shallow gas. No significant problem was encountered during drilling and logging, but after permanent plugging cutting of the casing proved problematic and caused some down time. The well was drilled with bentonite spud mud down to 492 m and with Glydril mud from 492 m to TD.The top of the reservoir, Stø Formation was entered at 662 m, only 237 m below the seafloor and contained oil. The well is located down-flanks on the structure; hence, the upper part may have a gas-cap. Due to increased claystone content and decreased porosity/permeability at the end of the coring, the oil/water contact was not clearly defined. However, log data and pressure data suggests that the Stø and Fruholmen formations are in communication and share a common OWC at 708.3 m. Oil shows were described in a Fruholmen sandstone at 728 m and in Snadd sandstones at 775 m, 784 m and 808 m. No shows were described below this depth or above top Stø Formation.Three consecutive cores were cut in the Realgrunnen Subgroup from 662 m to 710.35 m. The total core recovery for all three cores was 47.05 m (97.3%). The core-log depth shifts were found to be +0.75 m, +1.36 m, and +0.6 m for core number 1, 2, and 3, respectively. MDT oil samples were taken at 664.54 m and 678.07 m. The reservoir temperature based on data from the MDT sampling runs was 16.35 and 17.22 °C in the Stø Formation at 664.54 m and 678.07 m, respectively. The reservoir pressure was about 68.9 bar (664.54 m) and 69.97 bar (678.07 m). The gas-oil ratio determined by PVT analysis was 50 Sm3/Sm3 and the oil gravity is 0.835g/cm3. Gas chromatographic analyses of the oil sample at 664.54 m show depletion of n-alkanes compared to iso-alkanes, suggesting slight biodegradation has occurred in the reservoir. MDT water samples were taken at 782.3 m.The well was permanently abandoned on 17 September 2013 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]494.00929.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom1662.0667.4[m ]2668.0679.3[m ]3680.0710.4[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]47.1Cores 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 availableMDT664.000.00OILNOMDT678.000.00OILNO -
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 typeCONDUCTOR30488.036488.00.00SURF.COND.9 5/8636.012 1/4636.01.48FITOPEN HOLE930.08 1/2930.00.00 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]FMI PPC MSIP PPC EDTC636912HRLA PEX GR636918IBC MSIP GR CCL425636ILEF CMR EDTC642921LWD - ARC VIS8489625LWD - SON VIS NEOS488636LWD - VIS RES635923MDT GR664867MDT GR664782ZAIT IS PPC GR636928ZOVSP35920 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit424424500500563580590621662662679730772 -
Geochemical information
Geochemical information Document nameDocument formatDocument size [MB]txt0.02txt0.02txt0.04txt0.04txt0.05txt0.05txt0.02txt0.01txt0.02txt0.01txt0.02txt0.01txt0.02txt0.02txt0.01txt0.01 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured4501.02Sea Water5801.2013.0Glydril6331.1419.0KCl/Glycol8001.1612.0Glydril9301.2013.0Glydril