31/2-10
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Generell informasjon
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Brønnhistorie
GeneralWell 31/2-10 was drilled as an appraisal well in the Troll West oil province in the Northern North Sea. The main objectives were to define the top and intra reservoir markers in this area of the Troll West, establish the extent of the 27.5 m oil column in the area in which the GOC is at 1541 m sub-sea (1567 m RKB), and to determine the reserves potential in the structurally low area east-north of well 31/2-5 and south east of 31/2-7.Operations and resultsThe site survey revealed, typical for the area, numerous pockmarks. These had a fairly random distribution of 15 to 20 per km2. Although the size of individual pockmarks varied, average sizes were between 30 and 40 m wide at the rim, and 3 to 4 m deep at the centre. At the location itself no pockmark was seen.Well 31/2-10 was spudded with the semi-submersible installation Borgny Dolphin on 2 October 1982 and drilled to TD at 1833 m, 40 m into in the Early Jurassic Fensfjord Formation. After drilling the 36" section, a 14 3/4" pilot hole was drilled to 810 m. The hole was then logged without indication of shallow gas before opening up to 26". One and a half days were lost during coring due to bad weather. The well was drilled with spud mud down to 472 m, with gel/seawater from 472 m to 810 m, with KCl/polymer mud from 810 m to 1530 m, and with seawater/Drispac from 130 m to TD.Top Jurassic was encountered with a 35 m thick Draupne shale. The Sognefjord Formation sands were encountered at 1600 m, below the prognosed OWC. The Heather Formation came in at 1733 m, and the Fensfjord Formation at 1793 m. From top Sognefjord Formation to 1647 m bleeding oil and oil stained grains were noted on the cores. However the petrophysical interpretation concluded the sands to be water bearing.Ten cores were taken in the interval 1575 m to 1741.5 m and 127.98 m (77%) was recovered. All cores were taken in fibreglass sleeves to achieve better recovery in the loose sands. One RFT run was made between 1601.5 and 1817.5 m and confirmed a water gradient. No wire line fluid samples were taken.The well was permanently abandoned on 31 October as a dry well.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]510.001831.00 -
Borekjerner i Sokkeldirektoratet
Borekjerner i Sokkeldirektoratet Kjerneprøve nummerKjerneprøve - topp dybdeKjerneprøve - bunn dybdeKjerneprøve dybde - enhet11575.31580.2[m ]21585.01592.5[m ]31599.01617.0[m ]41617.51634.4[m ]51637.01655.3[m ]61655.51674.0[m ]71674.01686.4[m ]81692.01704.4[m ]91704.51723.0[m ]101723.01741.5[m ]Borekjerner i Sokkeldirektoratet Total kjerneprøve lengde [m]145.7Borekjerner i Sokkeldirektoratet Kjerner tilgjengelig for prøvetaking?YES -
Kjernebilder
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Palynologiske preparater i Sokkeldirektoratet
Palynologiske preparater i Sokkeldirektoratet Prøve dybdeDybde enhetPrøve typeLaboratorie1565.0[m]SWCSHELL1569.0[m]SWCSHELL1571.6[m]SWCSHELL1576.7[m]CSHELL1585.0[m]CSHELL1591.0[m]CSHELL1591.4[m]CSHELL1601.5[m]SWCSHELL1608.0[m]CSHELL1610.7[m]CSHELL1611.9[m]CSHELL1613.4[m]CSHELL1617.5[m]CSHELL1630.8[m]CSHELL1632.6[m]CSHELL1640.7[m]CSHELL1646.2[m]CSHELL1648.9[m]CSHELL1655.3[m]CSHELL1659.0[m]CSHELL1684.6[m]CSHELL1693.8[m]CSHELL1694.7[m]CSHELL1697.2[m]CSHELL1702.0[m]CSHELL1704.3[m]CSHELL1724.8[m]CSHELL1732.7[m]CSHELL1741.5[m]CSHELL1746.0[m]SWCSHELL1755.8[m]SWCSHELL1762.0[m]SWCSHELL1769.4[m]SWCSHELL1775.0[m]SWCSHELL1782.0[m]SWCSHELL1786.4[m]SWCSHELL1792.7[m]SWCSHELL1795.5[m]SWCSHELL1803.5[m]SWCSHELL1808.2[m]SWCSHELL1820.3[m]SWCSHELL -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet3567391279127913631388153515351539155515651565160017331793 -
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]pdf0.17pdf0.12 -
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk)
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk) Dokument navnDokument formatDokumentstørrelse [MB]PDF7.82pdf0.09pdf1.26pdf1.23pdf0.25pdf0.37pdf1.39pdf2.40pdf16.19pdf0.34pdf0.04pdf1.02 -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]CBL VDL5001515CST7941520CST15201820DLL MSFL GR CAL15151824HDT15151833ISF BHC GR350810ISF BHC GR7941526ISF BHC GR15151831LDT CNL GR7941528LDT CNL GR CAL455811LDT CNL NGT CAL15151833RFT00WST5501820 -
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 formasjonstestCONDUCTOR30454.036472.00.00LOTSURF.COND.20793.026810.01.51LOTINTERM.13 3/81514.017 1/21530.01.59LOTOPEN HOLE1575.012 1/41575.00.00LOTOPEN HOLE1833.08 1/21833.00.00LOT -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling4901.05waterbased7901.07waterbased9001.18waterbased12501.30waterbased13501.35waterbased15001.35waterbased18331.18waterbased -
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]pdf0.19