31/5-3
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Generell informasjon
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Brønnhistorie
GeneralWell 31/5-3 was drilled in the southern part of the Troll West Field. The main objectives were to appraise and test the reservoir qualities and the lithology of the Late Jurassic Sognefjord Formation.Operations and resultsWell 31/5-3 was spudded with the semi-submersible installation Treasure Saga on 10 April 1984 and drilled to TD at 2250 m in the Late Jurassic Drake Formation. At 1426 m circulation was lost, and 450 bbls mud was lost to formation before the well was stabilized. The well was drilled with spud mud down to 950 m, with KCl/polymer mud from 950 m to 1497 m, and with a Pro-wate/NaCl-brine/pro-salt mud from 1497 m to TD.The well proved the existence of a stratigraphy ranging from Lower Jurassic to Quarternary. The Tertiary and Quaternary sections were mainly composed of claystones, with a minor sand developed in Pleistocene at the base of the Nordland Group. The Jurassic was composed of sandstone and siltstones in the Viking and Brent Groups, and mainly claystone with an interbedded sandstone layer in the Dunlin Group. One major unconformity was found between Early Portlandian and Maastrichtian. Four other unconformities were also observed in the well, from Aalenian to Bathonian, from Early Kimmeridgian to Early Portlandian, from Late Oligocene to Pliocene, and one intra-Oligocene.The Sognefjord Formation was hydrocarbon bearing with a 39.5 m hydrocarbon column, of which 17.5 m was gas and 22 m was oil. Top reservoir was found at 1555 m, the GOC was at 1572.5 m, and the OWC at 1594.5 m. Oil shows persisted further down, but decreased from 1595 m and disappeared below 1622 m. No other interval in the well was hydrocarbon bearing.Three cores were cut from 1550 m to 1622.5 m in the Late Jurassic Sognefjord Formation. FMT gas samples were taken at 1557 m and 1567. Three more FMT fluid samples were taken in the oil zone at 1577 m, 1591 m, and at 1592 m.The well was permanently abandoned on 9 June 1984 as a gas and oil appraisal well.TestingTwo drill stem tests were performed in the Sognefjord Formation. Both the intervals were gravel packed. DST # 1 from 1606 - 1610 m produced formation water. DST # 2 from 1582.3 - 1586.3 m produced 1100 Sm3/day of oil with a constant GOR of approximately 55Sm3/Sm3. Gas coning occurred as the rate was increased to 1550 m /day. The GOR stabilized at its original value as the rate was reduced to 1050 Sm3 /day -
Borekaks i Sokkeldirektoratet
Borekaks i Sokkeldirektoratet Borekaks tilgjengelig for prøvetaking?YESBorekaks i Sokkeldirektoratet Borekaksprøve, topp dybde [m]Borekaksprøve, bunn dybde [m]440.002250.00 -
Borekjerner i Sokkeldirektoratet
Borekjerner i Sokkeldirektoratet Kjerneprøve nummerKjerneprøve - topp dybdeKjerneprøve - bunn dybdeKjerneprøve dybde - enhet11550.01568.0[m ]21568.01594.4[m ]31595.01622.0[m ]Borekjerner i Sokkeldirektoratet Total kjerneprøve lengde [m]71.4Borekjerner i Sokkeldirektoratet Kjerner tilgjengelig for prøvetaking?YES -
Kjernebilder
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Oljeprøver i Sokkeldirektoratet
Oljeprøver i Sokkeldirektoratet Test typeFlaske nummerTopp dyp
MD [m]Bunn dyp
MD [m]Væske typeTest tidspunktPrøver tilgjengeligDSTDST21582.301586.30OIL02.06.1984 - 19:00YES -
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 formasjonstestCONDUCTOR30425.036430.00.00LOTSURF.COND.20950.026963.01.89LOTINTERM.13 3/81497.017 1/21515.01.57LOTINTERM.9 5/81905.012 1/42236.01.73LOTOPEN HOLE2253.08 1/22253.00.00LOT -
Borestrengtester (DST)
Borestrengtester (DST) Test nummerFra dybde MD
[m]Til dybde MD
[m]Reduksjonsventil størrelse
[mm]1.0160616180.02.01582158644.5Borestrengtester (DST) Test nummerEndelig avstengningstrykk
[MPa]Endelig strømningstrykk
[MPa]Bunnhullstrykk
[MPa]Borehullstemperatur
[°C]1.0712.0Borestrengtester (DST) Test nummerOlje produksjon
[Sm3/dag]Gass produksjon
[Sm3/dag]Oljetetthet
[g/cm3]Gasstyngde rel. luftGOR
[m3/m3]1.02.01230590400.65048 -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]CDL CNL GR14971911CDL CNL GR19052244CDL GR425964CDL GR9501506DIFL LSBHC GR425965DIFL LSBHC GR9501512DIFL LSBHC GR14971914DIFL LSBHC GR19052246DIPLOG14921900DIPLOG19052243DLL MLL GR14971912FMT15551663FMT19482168GR327430SPECTRALOG14971906VELOCITY9702230 -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet35378013401340140214771547154715551666171818481905199221032103 -
Spleisede logger
Spleisede logger Dokument navnDokument formatDokumentstørrelse [MB]pdf0.35 -
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk)
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk) Dokument navnDokument formatDokumentstørrelse [MB]pdf12.08 -
Dokumenter – eldre Sokkeldirektoratets WDSS rapporter og andre relaterte dokumenter
Dokumenter – eldre Sokkeldirektoratets WDSS rapporter og andre relaterte dokumenter Dokument navnDokument formatDokumentstørrelse [MB]pdf0.22pdf0.22 -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling4261.03WATER BASED30.04.19844301.03WATER BASED30.04.19844401.08WATER BASED30.04.19847911.14WATER BASED30.04.19848371.16WATER BASED30.04.19849631.2047.025.0WATER BASED30.04.19849631.2047.025.0WATER BASED30.04.19849631.18WATER BASED30.04.19849651.14WATER BASED30.04.198410801.3049.028.0WATER BASED30.04.198411771.2547.024.0WATER BASED30.04.198413951.3049.028.0WATER BASED30.04.198414261.3046.024.0WATER BASED30.04.198415151.3046.023.0WATER BASED30.04.198415151.3046.023.0WATER BASED30.04.198415151.3046.023.0WATER BASED30.04.198415181.1880.060.0WATER BASED30.04.198415681.1878.050.0WATER BASED30.04.198415951.0078.051.0WATER BASED03.05.198416231.1869.045.0WATER BASED03.05.198417301.1877.052.0WATER BASED03.05.198418801.1880.054.0WATER BASED03.05.198419151.1879.056.0WATER BASED03.05.198419151.1878.053.0WATER BASED03.05.198419151.1885.060.0WATER BASED03.05.198419151.1987.058.0WATER BASED04.05.198419151.1975.052.0WATER BASED07.05.198419151.1987.058.0WATER BASED04.05.198419151.1878.053.0WATER BASED03.05.198419151.1885.060.0WATER BASED03.05.198419151.1975.052.0WATER BASED07.05.198422361.2061.042.0WATER BASED07.05.198422501.2061.042.0WATER BASED08.05.198422500.0061.042.0WATER BASED07.06.1984