31/6-5
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Generell informasjon
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Brønnhistorie
GeneralWell 31/6-5 was drilled in the southern part of the Troll East gas province, 30 m from well 31/6-4, which was junked for technical reasons. The main purpose was to appraise and test possible oil and gas accumulations in sandstones of Late to Middle Jurassic age, and to give further information about lateral facies changes within the reservoir sandstones.Operations and resultsAppraisal well 31/6-5 was spudded with the semi-submersible installation Deepsea Bergen on 5 March 1984 and drilled to TD at 2082 m in the Early Jurassic Drake Formation. In the 26" hole lost circulation occurred at 653 m, two cement plugs were set. Several wiper trips were taken due to tight hole. After setting of the 20" casing, the BOP had to be repaired due to leaking during pressure testing. A drilling break occurred at 1476 m in the 12 1/4" hole. The well was drilled with the spud mud from the previous hole (31/6-4) treated with CMC-EHV down to 389 m, with seawater/gel mud from 389 m to 663 m, with KCl/polymer mud from 663 m to 1720 m, and with seawater/gel/CMC mud from 1720 m to TD.Sandstone of Late to Middle Jurassic age (Sognefjord Formation) was encountered at 1518 m with a 52 m gas column and a 4 m oil column. The gas/oil contact was at 1570 m and the oil/water contact at 1574 m. Oil shows were recorded on sidewall cores on top Fensfjord Formation sandstone from 1722 m to 1726 m and on a sandstone SWC from 2010 m in the Ness Formation. Ten cores were cut from 1470 m to 1721 m in the Late to Middle Jurassic sequence (Heather Formation to Fensfjord Formation). One FMT fluid sample was taken in the oil zone 1571.5 m. Geochemical analyses showed the oil to be biodegraded.The well was permanently abandoned on 16 March 1984 as a gas and oil appraisal.TestingThe Sognefjord Formation was tested through gravel pack from the interval 1558 m to 1568 m. The first test gave a non-representative flow due to obstructions in the hole. The second test, termed Test 1A, was ok and produced gas at a maximum rate of 1266000 Sm3/day on a 1.5" choke. Geochemical analyses showed the gas to be 92.4% methane and biodegraded. -
Borekaks i Sokkeldirektoratet
Borekaks i Sokkeldirektoratet Borekaks tilgjengelig for prøvetaking?YESBorekaks i Sokkeldirektoratet Borekaksprøve, topp dybde [m]Borekaksprøve, bunn dybde [m]410.002081.50 -
Borekjerner i Sokkeldirektoratet
Borekjerner i Sokkeldirektoratet Kjerneprøve nummerKjerneprøve - topp dybdeKjerneprøve - bunn dybdeKjerneprøve dybde - enhet11470.01497.3[m ]21497.01518.0[m ]31523.01550.5[m ]41550.51557.4[m ]51557.51584.0[m ]61584.01611.0[m ]71611.01637.8[m ]81638.01665.8[m ]91665.51693.5[m ]101693.01720.7[m ]Borekjerner i Sokkeldirektoratet Total kjerneprøve lengde [m]246.2Borekjerner i Sokkeldirektoratet Kjerner tilgjengelig for prøvetaking?YES -
Kjernebilder
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Palynologiske preparater i Sokkeldirektoratet
Palynologiske preparater i Sokkeldirektoratet Prøve dybdeDybde enhetPrøve typeLaboratorie690.0[m]SWCSTATO752.0[m]SWCSTATO790.0[m]SWCSTATO850.0[m]SWCSTATO890.0[m]SWCSTATO930.0[m]SWCSTATO1010.0[m]SWCSTATO1050.0[m]SWCSTATO1110.0[m]SWCSTATO1130.0[m]SWCSTATO1310.0[m]SWCSTATO1380.0[m]SWCSTATO1395.0[m]SWCSTATO1400.0[m]SWCSTATO1410.0[m]SWCSTATO1415.0[m]SWCSTATO1425.0[m]SWCSTATO1430.0[m]SWCSTATO1440.0[m]SWCSTATO1442.0[m]SWCSTATO1446.0[m]SWCSTATO1452.0[m]SWCSTATO1456.0[m]SWCSTATO1460.0[m]SWCSTATO1468.0[m]SWCSTATO1473.7[m]SWCSTATO1518.0[m]SWCSTATO1520.0[m]SWCSTATO1786.0[m]SWCSTATO1821.0[m]SWCSTATO1880.0[m]SWCSTATO1993.0[m]SWCSTATO1998.0[m]SWCSTATO2036.0[m]SWCSTATO2046.0[m]SWCSTATO2080.0[m]SWCSTATO -
Oljeprøver i Sokkeldirektoratet
Oljeprøver i Sokkeldirektoratet Test typeFlaske nummerTopp dyp
MD [m]Bunn dyp
MD [m]Væske typeTest tidspunktPrøver tilgjengeligDSTTEST1A1568.001558.0015.05.1984 - 11:30YES -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet3274558168169601080114411441157125612561312134713881388148015181677170219371972199920352035 -
Spleisede logger
Spleisede logger Dokument navnDokument formatDokumentstørrelse [MB]pdf0.33 -
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]pdf0.18pdf0.21 -
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk)
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk) Dokument navnDokument formatDokumentstørrelse [MB]pdf28.81pdf1.31pdf6.37pdf0.81pdf0.30pdf17.51pdf3.73pdf0.60pdf1.43pdf5.61pdf0.25pdf9.77pdf10.32pdf2.28pdf1.19pdf0.88pdf15.53pdf16.88pdf6.44 -
Borestrengtester (DST)
Borestrengtester (DST) Test nummerFra dybde MD
[m]Til dybde MD
[m]Reduksjonsventil størrelse
[mm]1.01558156838.1Borestrengtester (DST) Test nummerEndelig avstengningstrykk
[MPa]Endelig strømningstrykk
[MPa]Bunnhullstrykk
[MPa]Borehullstemperatur
[°C]1.0Borestrengtester (DST) Test nummerOlje produksjon
[Sm3/dag]Gass produksjon
[Sm3/dag]Oljetetthet
[g/cm3]Gasstyngde rel. luftGOR
[m3/m3]1.01266000 -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]4-ARM DIP STRATADIP14242081ACBL3231424CALIPER14931534CDL CNL GR CAL14242079CDL GR CAL6491445COLLARLOG14001600DIFL BHC AC GR SP CAL3892082DLL MLL GR14242079DLWD401504FMT14901602PHOTONLOG14881580SPECTRALOG14242076VDL11501705VELOCITY10002080 -
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 formasjonstestCONDUCTOR30389.236390.50.00LOTSURF.COND.20649.026656.01.54LOTINTERM.13 3/81424.017 1/21445.01.76LOTINTERM.9 5/81706.912 1/41721.01.62LOTOPEN HOLE2082.08 1/22082.00.00LOT -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling4301.0540.0WATER BASED5501.0739.0WATER BASED6601.1054.0WATER BASED7601.2247.0WATER BASED10651.2348.0WATER BASED11551.2247.0WATER BASED12601.2649.0WATER BASED15801.2252.0WATER BASED17251.1059.0WATER BASED -
Tynnslip i Sokkeldirektoratet
Tynnslip i Sokkeldirektoratet DybdeEnhet1492.55[m ]1525.35[m ]1536.50[m ]1556.50[m ]1562.35[m ]1573.15[m ]1587.10[m ]1591.40[m ]1601.75[m ]1610.50[m ]1627.50[m ]1637.90[m ]1646.73[m ]1660.00[m ]1664.00[m ]16.00[m ]1677.50[m ]1686.70[m ]1698.00[m ]1491.00[m ]1493.00[m ]1514.00[m ]1517.00[m ]1591.00[m ]1525.00[m ]1573.00[m ]1537.00[m ]1541.00[m ]1547.00[m ]1557.00[m ]1562.00[m ]1580.00[m ]1587.00[m ]1602.00[m ]1611.00[m ]1622.00[m ]1628.00[m ]1638.00[m ]1647.00[m ]1653.00[m ]1711.00[m ] -
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]pdf0.20