31/6-2
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Generell informasjon
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Brønnhistorie
GeneralAppraisal well 31/6-2 was drilled on a location on the south-east periphery on the Troll East gas province. The main objective was to test the gas and oil accumulations in sandstones of Late to Middle Jurassic age. The planned TD was about 200 m into rocks of Triassic age to an estimated total depth of 2400 m RKB.The well is Reference well for the Hardråde Formation and for the undifferentiated Shetland Group in the Troll area.Operations and resultsWell 31/6-2 was spudded with the semi-submersible installation Deepsea Bergen on 18 October 1983 and drilled to TD at 2020 m in the Early Jurassic Drake Formation. Because of problems with a leak in 20" casing and lost circulation problems in a major fault, both 13 3/8" and 9 5/8" casing had to be set high. The well was drilled with sea water and hi-vis pills down to 412 m, with AQUAGEL/seawater spud mud from 412 m to 801 m, with KCl polymer mud from 801 m to TD. At 984 m Lost Circulation Material -pills were added to cure lost circulation problems.No reservoir sections were developed above the Jurassic. The well encountered 113 m of Draupne shale with top at 1322 m, overlying a 25 m thick Heather Formation sequence. The Sognefjord Formation sandstone reservoir was encountered at 1460 m with a gas column of approximately 110 m. No oil leg could be detected from electric logs or FMT's. Oil shows were recorded on sidewall core sandstone in the interval from 1831 m to 1988 m in the Middle to Early Jurassic. Nine cores were cut from 1435 m to 1619 m in the Heather and Sognefjord Formations. FMT sampling in the Sognefjord Formation recovered small amounts of gas from 1475 m and 1572 m. A sample from 1577 m gave mud filtrate.The well was suspended on 11 December 1983 as a gas appraisal.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]420.002235.00 -
Borekjerner i Sokkeldirektoratet
Borekjerner i Sokkeldirektoratet Kjerneprøve nummerKjerneprøve - topp dybdeKjerneprøve - bunn dybdeKjerneprøve dybde - enhet11435.01453.3[m ]21453.01471.4[m ]31471.61483.6[m ]41483.61497.1[m ]51497.11515.9[m ]61515.71543.4[m ]71543.61571.5[m ]81571.51589.0[m ]91591.01618.3[m ]Borekjerner i Sokkeldirektoratet Total kjerneprøve lengde [m]181.4Borekjerner i Sokkeldirektoratet Kjerner tilgjengelig for prøvetaking?YES -
Kjernebilder
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Palynologiske preparater i Sokkeldirektoratet
Palynologiske preparater i Sokkeldirektoratet Prøve dybdeDybde enhetPrøve typeLaboratorie995.0[m]SWCIKU1050.0[m]SWCIKU1250.0[m]SWCIKU1294.0[m]SWCIKU1326.5[m]SWCIKU1344.5[m]SWCIKU1360.0[m]SWCIKU1380.0[m]SWCIKU1399.0[m]SWCIKU1411.0[m]SWCIKU1426.0[m]SWCIKU1630.0[m]SWCIKU1660.0[m]SWCIKU1686.0[m]SWCIKU1710.0[m]SWCIKU1726.0[m]SWCIKU1745.0[m]SWCIKU1783.0[m]SWCIKU1800.0[m]SWCIKU1831.0[m]SWCIKU1855.0[m]SWCIKU1902.0[m]SWCIKU1915.5[m]SWCIKU1927.0[m]SWCIKU1937.0[m]SWCIKU1988.5[m]SWCIKU -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet32650562662677688596896897811281128122313221322143514601625164218751910193119751975 -
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]pdf0.30pdf0.23 -
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk)
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk) Dokument navnDokument formatDokumentstørrelse [MB]pdf18.98pdf1.29pdf7.28pdf0.88pdf0.46pdf0.66pdf13.96pdf6.31pdf6.12pdf2.46pdf0.85pdf2.60pdf9.45pdf0.17pdf25.98pdf5.83pdf8.92pdf5.38pdf6.17pdf6.40pdf3.19pdf3.03pdf17.60pdf2.77pdf6.41pdf1.07 -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]ACBL VDL GR326902ACBL VDL GR5151390CDL CNL GR CAL8002020CDL GR CAL412816DIFL BHC AC GR SP4122020DLL MLL GR13902020FMT13902020HR DIP9031400HR DIP13902020SPECTRALOG13902020VSP8952020 -
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 formasjonstestCONDUCTOR30412.036412.00.00LOTSURF.COND.20801.026818.01.56LOTINTERM.13 3/8902.017 1/2920.01.76LOTINTERM.9 5/81391.012 1/41400.01.61LOTLINER72004.08 1/22020.00.00LOT -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling4101.0445.0WATER BASED4801.0841.0WATER BASED9001.3047.0WATER BASED10101.2044.0WATER BASED14701.2546.0WATER BASED20051.1052.04.8WATER BASED07.08.198420751.1063.06.2WATER BASED07.08.198422351.1156.05.8WATER BASED07.08.198422351.1157.04.8WATER BASED07.08.1984 -
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]pdf0.16