31/4-4
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Generell informasjon
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Brønnhistorie
GeneralWildcat well 31/4-4 is located on the Lomre Terrace north of the Brage Field and east of the Oseberg Field. The primary objective of the well was to test possible sandstone reservoirs of Cretaceous age. The secondary objective was to test sandstone reservoirs of Late Jurassic age, anticipated to be Intra Heather Formation sands.The well is Reference Well for the Etive, Ness, and Tarbert Formations of the Brent Group.Operations and resultsWell 31/4-4 was spudded with the semi-submersible installation Nortrym on 17 December 1980 and drilled to TD at 3150 m in Early Jurassic sediments of the Statfjord Formation. The well was drilled with seawater and viscous gel down to 900 m and with KCl / polymer mud from 900 m to TD.No reservoir sands of Cretaceous age were encountered in the well. Poor shows were reported from two limestone stringers and a thin, tight sandstone stringer of Late Cretaceous (Maastrichtian and Late Campanian) age. A Late Jurassic "Intra Heather Sand I" (Sognefjord Formation) was encountered at 2363 m with a gross thickness of 39 m. The net sand interval was 24 m and consisted of fine-grained to very fine-grained argillaceous, micaceous sandstone. Average porosity was calculated to 16 %. Eighty-nine percent water saturation was calculated for this sand indicating that poor oil shows encountered while drilling the interval, were residual. A second "Intra Heather Sand II" (Fensfjord Formation) was penetrated at 2482 m with a gross thickness of 45 m. The sand was water bearing without shows. The lithology was similar to the upper sand. The other reservoir sequences encountered in the well, sandstones in the Middle Jurassic Brent Formation, the Early Jurassic Cook Formation, and the Statfjord Formation, were also water bearing. The gross sand thicknesses of these were 118 m, 21m and 67m, respectively.A single conventional core was cut between 2490m and 250 8m, near the top of the lower Intra Heather Sand interval. It was dated to Oxfordian in age and consisted of 18 m (100%) of very fine-grained sandstone with good porosity, except in some heavily cemented horizons. No fluid sample was taken.The well was permanently abandoned on 17 February 1981 as a dry hole.TestingNo drill stem test was performed. -
Borekaks i Sokkeldirektoratet
Borekaks i Sokkeldirektoratet Borekaks tilgjengelig for prøvetaking?YESBorekaks i Sokkeldirektoratet Borekaksprøve, topp dybde [m]Borekaksprøve, bunn dybde [m]350.003150.00 -
Borekjerner i Sokkeldirektoratet
Borekjerner i Sokkeldirektoratet Kjerneprøve nummerKjerneprøve - topp dybdeKjerneprøve - bunn dybdeKjerneprøve dybde - enhet12490.02508.0[m ]Borekjerner i Sokkeldirektoratet Total kjerneprøve lengde [m]18.0Borekjerner i Sokkeldirektoratet Kjerner tilgjengelig for prøvetaking?YES -
Kjernebilder
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Palynologiske preparater i Sokkeldirektoratet
Palynologiske preparater i Sokkeldirektoratet Prøve dybdeDybde enhetPrøve typeLaboratorie740.0[m]DC760.0[m]DC790.0[m]DC820.0[m]DC850.0[m]DC880.0[m]DC910.0[m]DC940.0[m]DC970.0[m]DC1000.0[m]DC1030.0[m]DC1060.0[m]DC1090.0[m]DC1120.0[m]DC1150.0[m]DC1180.0[m]DC1210.0[m]DC1240.0[m]DC1270.0[m]DC1300.0[m]DC1330.0[m]DC1360.0[m]DC1390.0[m]DC1420.0[m]DC1450.0[m]DC1480.0[m]DC1510.0[m]DC1540.0[m]DC1570.0[m]DC1600.0[m]DC1630.0[m]DC1660.0[m]DC1690.0[m]DC1720.0[m]DC1720.0[m]DC1750.0[m]DC1780.0[m]DC1810.0[m]DC1840.0[m]DC1870.0[m]DC1900.0[m]DC1910.0[m]DC1930.0[m]DC1945.0[m]DC1960.0[m]DC1970.0[m]DC1980.0[m]DC1990.0[m]DC2000.0[m]DC2020.0[m]DC2040.0[m]DC2050.0[m]DC2080.0[m]DC2100.0[m]DC2115.0[m]DC2130.0[m]DC2150.0[m]DC2160.0[m]DC2175.0[m]DC2190.0[m]DC2200.0[m]DC2213.0[m]SWCIKU2216.0[m]SWCIKU2220.0[m]DC2227.0[m]DC2250.0[m]DC2255.0[m]DC2280.0[m]DC2280.0[m]CIKU2285.0[m]DCPETROSTR2287.0[m]DCPETROS2290.0[m]DCPETROS2295.0[m]DCPETROS2300.0[m]DC2302.0[m]DCPETROS2305.0[m]CIKU2312.0[m]DCPETROSTR2317.0[m]DCPETROS2325.0[m]DCPETROS2330.0[m]DCPETROS2330.0[m]CIKU2335.0[m]DCPETROSTR2352.0[m]DCPETROSTR2357.0[m]DCPETROS2362.0[m]DCPETROS2364.0[m]SWCIKU2365.0[m]DCPETROSTR2367.0[m]DCPETROS2382.0[m]DCPETROS2382.0[m]SWCIKU2385.0[m]DCPETROSTR2387.0[m]DCPETROS2410.0[m]SWCIKU2480.0[m]SWCIKU2484.9[m]SWCIKU2489.6[m]CIKU2493.5[m]CIKU2498.0[m]CIKU2502.5[m]CIKU2506.8[m]CIKU2507.7[m]CIKU2522.9[m]SWCIKU2528.9[m]SWCIKU2577.0[m]SWCIKU2628.0[m]SWCIKU2667.0[m]SWCIKU2697.0[m]SWCIKU2716.0[m]SWCIKU2767.0[m]SWCIKU2785.9[m]SWCIKU2788.6[m]SWCIKU2830.0[m]SWCIKU2851.0[m]SWCIKU2855.0[m]SWCIKU2959.0[m]SWCIKU2986.0[m]SWCIKU3022.0[m]SWCIKU3040.0[m]SWCIKU3060.0[m]SWCIKU3080.0[m]SWCIKU3136.0[m]SWCIKU3152.0[m]SWCIKU -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet239733810890179617961853189320502067219523002300236524022482252726802680269527212798293529563087 -
Spleisede logger
Spleisede logger Dokument navnDokument formatDokumentstørrelse [MB]pdf0.49 -
Geokjemisk informasjon
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Dokumenter – eldre Sokkeldirektoratets WDSS rapporter og andre relaterte dokumenter
Dokumenter – eldre Sokkeldirektoratets WDSS rapporter og andre relaterte dokumenter Dokument navnDokument formatDokumentstørrelse [MB]pdf0.10pdf0.27 -
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk)
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk) Dokument navnDokument formatDokumentstørrelse [MB]pdf12.43pdf2.24 -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]CST20602410CST20662735CST24803152FDC CNL GR CAL19093153FDC GR CAL8861908HDT20003153ISF BHC GR SP3243152RFT23663147VELOCITY8003140 -
Foringsrør og formasjonsstyrketester
Foringsrør og formasjonsstyrketester Type utforingUtforing diam.
[tommer]Utforing dybde
[m]Brønnbane diam.
[tommer]Brønnbane dyp
[m]LOT/FIT slam eqv.
[g/cm3]Type formasjonstestCONDUCTOR30324.036325.00.00LOTSURF.COND.20886.026900.01.60LOTINTERM.13 3/81481.017 1/21918.01.60LOTOPEN HOLE3152.012 1/43152.00.00LOT -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling3251.04100.0seawater9001.1139.0seawater19181.4053.018.0seawater24901.3057.017.0seawater31501.3061.022.0seawater -
Trykkplott
Trykkplott Porertrykksdataene kommer fra logging i brønnen hvis ingen annen kilde er oppgitt. I noen brønner der trykk ikke er logget, er det brukt informasjon fra formasjonstester eller brønnspark. Trykkdataene er rapportert inn til Oljedirektoratet og videre prosessert og kvalitetssikret av IHS Markit.Trykkplott Dokument navnDokument formatDokumentstørrelse [MB]pdf0.22