15/12-8
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Generell informasjon
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Brønnhistorie
GeneralWildcat well 15/12-8 was drilled ca 3.5 km east of the 15/12-4 well, which made the Varg oil discovery in Jurassic and Triassic sandstones. The main objective of the well was to test the potential for hydrocarbons in sandstones of Oxfordian and Triassic age. Seismic anomalies at 437, 467, 479 and 803 m indicated possibility for shallow gas. Planned TD for the well was 3260 m.Operations and resultsWell 15/12-8 was spudded with the semi-submersible installation Deepsea Bergen on 5 June 1991 and drilled to TD at 3054 m in the Triassic Skagerrak Formation. No significant problems occurred during operations. The well was drilled with seawater / hi-vis pills / CMC down to 615 m, with KCl/polymer mud from 615 m to 2855 m, and with Ancotemp/bentonite mud from 2855 m to TD. No shallow gas was encountered.Jurassic Vestland Group sandstone was encountered hydrocarbon-bearing at 2838 m. The hydrocarbon column extended 23 m into Triassic sandstone of the Skagerrak Formation. The gas/water contact was estimated to 2877 m, confirmed by FMT pressure gradients and wire line logs. The well was tested, and since no core was cut through the reservoir, the well was sidetracked at 2623 m with TD at 2940 m. The sidetrack was drilled with Ancotemp/bentonite mud. Three conventional cores were cut in the interval 2841 - 2902 m. The sidetrack was formally named 15/12-8 A.The FMT tool was run in well 15/12-8 and 15/12-8A. One segregated sample was taken at 2863 m in 15/12-8 (gas, condensate and mud filtrate) and another in the water zone at 2888 m in well 15/12-8 A (recovered mud only due to seal failure).Well 15/12-8 was permanently abandoned on 14 July 1991 as a gas/condensate discovery. The 15/12-8 A sidetrack was permanently abandoned on 29 July as a gas/condensate appraisal well.TestingOne DST test was performed in 15/12-8 in the interval 2838 - 2869 m. The well produced gas-condensate with a dew point of 230 bar at the measured reservoir temperature, which was 123 deg C. The rates were 550 000 Sm3 gas and 420 Sm3 condensate /day through a 15.9 mm choke. The condensate/gas ratio was 1308 Sm3/Sm3, the condensate gravity was 61 deg API, and the gas gravity was 0.817 (air = 1). -
Borekaks i Sokkeldirektoratet
Borekaks i Sokkeldirektoratet Borekaks tilgjengelig for prøvetaking?YESBorekaks i Sokkeldirektoratet Borekaksprøve, topp dybde [m]Borekaksprøve, bunn dybde [m]620.003054.00 -
Palynologiske preparater i Sokkeldirektoratet
Palynologiske preparater i Sokkeldirektoratet Prøve dybdeDybde enhetPrøve typeLaboratorie1210.0[m]DCGEOCH1250.0[m]DCGEOCH1270.0[m]DCGEOCH1280.0[m]DCGEOCH1300.0[m]DCGEOCH1310.0[m]DCGEOCH1330.0[m]DCGEOCH1340.0[m]DCGEOCH1360.0[m]DCGEOCH1370.0[m]DCGEOCH1390.0[m]DCGEOCH1400.0[m]DCGEOCH1420.0[m]DCGEOCH1430.0[m]DCGEOCH1450.0[m]DCGEOCH1460.0[m]DCGEOCH1480.0[m]DCGEOCH1490.0[m]DCGEOCH1510.0[m]DCGEOCH1520.0[m]DCGEOCH1540.0[m]DCGEOCH1550.0[m]DCGEOCH1570.0[m]DCGEOCH1580.0[m]DCGEOCH1600.0[m]DCGEOCH1610.0[m]DCGEOCH1630.0[m]DCGEOCH1640.0[m]DCGEOCH1660.0[m]DCGEOCH1670.0[m]DCGEOCH1690.0[m]DCGEOCH1700.0[m]DCGEOCH1720.0[m]DCGEOCH1730.0[m]DCGEOCH1750.0[m]DCGEOCH1760.0[m]DCGEOCH1780.0[m]DCGEOCH1790.0[m]DCGEOCH1810.0[m]DCGEOCH1822.8[m]SWCSTATO1840.0[m]DCGEOCH1850.0[m]DCGEOCH1868.8[m]SWCSTATO1880.0[m]DCGEOCH1900.0[m]DCGEOCH1910.0[m]DCGEOCH1930.0[m]DCGEOCH1939.8[m]SWCSTATO1960.0[m]DCGEOCH1970.0[m]DCGEOCH1986.8[m]SWCSTATO2000.0[m]DCGEOCH2020.0[m]DCGEOCH2030.0[m]DCGEOCH2050.0[m]DCGEOCH2067.3[m]SWCSTATO2080.0[m]DCGEOCH2090.0[m]DCGEOCH2109.8[m]SWCSTATO2120.0[m]DCGEOCH2130.0[m]DCGEOCH2150.0[m]DCGEOCH2160.0[m]DCGEOCH2177.3[m]SWCSTATO2190.0[m]DCGEOCH2203.0[m]DCGEOCH2215.0[m]DCGEOCH2230.0[m]DCGEOCH2246.3[m]SWCSTATO2251.0[m]DCGEOCH2258.8[m]SWCSTATO2272.8[m]SWCSTATO2286.8[m]SWCSTATO2310.8[m]SWCSTATO2318.8[m]SWCSTATO2335.0[m]DCGEOCH2350.0[m]DCGEOCH2365.0[m]DCGEOCH2380.0[m]DCGEOCH2410.0[m]DCGEOCH2419.8[m]SWCSTATO2440.0[m]DCGEOCH2831.8[m]SWCSTATO2834.8[m]SWCSTATO2836.8[m]SWCSTATO2837.0[m]DCGEOCH2841.0[m]CSTATO2843.0[m]CSTATO2844.7[m]CSTATO2846.5[m]CSTATO2847.4[m]CSTATO2848.7[m]CSTATO2850.4[m]CSTATO2852.8[m]CSTATO2885.0[m]DCGEOCH2900.0[m]DCGEOCH2912.0[m]DCGEOCH2960.0[m]DCGEOCH2990.0[m]DCGEOCH3020.0[m]DCGEOCH3054.0[m]DCGEOCH -
Oljeprøver i Sokkeldirektoratet
Oljeprøver i Sokkeldirektoratet Test typeFlaske nummerTopp dyp
MD [m]Bunn dyp
MD [m]Væske typeTest tidspunktPrøver tilgjengeligDSTTEST12838.002869.0009.07.1991 - 04:35YES -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet11010821207225122512268233324412464246424962626273827702770279728292829283828542854 -
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]pdf0.48pdf0.19 -
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk)
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk) Dokument navnDokument formatDokumentstørrelse [MB]pdf2.80pdf22.14 -
Borestrengtester (DST)
Borestrengtester (DST) Test nummerFra dybde MD
[m]Til dybde MD
[m]Reduksjonsventil størrelse
[mm]1.02838286915.9Borestrengtester (DST) Test nummerEndelig avstengningstrykk
[MPa]Endelig strømningstrykk
[MPa]Bunnhullstrykk
[MPa]Borehullstemperatur
[°C]1.0123Borestrengtester (DST) Test nummerOlje produksjon
[Sm3/dag]Gass produksjon
[Sm3/dag]Oljetetthet
[g/cm3]Gasstyngde rel. luftGOR
[m3/m3]1.04205500000.8171308 -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]ACBL VDL GR1152828ACL GR ZDL17932839CDL CN GR26212933CDL GR170484DIFL AC MLL GR26212933DIFL ACL GR1703048DIPLOG GR28283046FMT GR28383009MLL ZDL CN GR28283048MWD - GR RES DIR1703054VELOCITY4853045ZDL GR6011815 -
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 formasjonstestCONDUCTOR30170.536172.00.00LOTINTERM.20601.026603.01.74LOTINTERM.13 3/81798.017 1/21800.01.84LOTINTERM.9 5/82837.012 1/42840.02.01LOTLINER73051.08 1/23051.00.00LOT -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling1711.03WATER BASED06.06.19912781.03WATER BASED10.06.19916011.3520.011.0WATER BASED17.06.19916011.3525.012.5WATER BASED17.06.19916011.3519.03.0WATER BASED17.06.19916151.03WATER BASED10.06.19916150.00WATER BASED10.06.199110361.2015.04.0WATER BASED14.06.199114601.3017.04.0WATER BASED14.06.199114601.3020.06.5WATER BASED14.06.199117891.5122.03.5WATER BASED20.06.199117891.5326.03.5WATER BASED20.06.199117981.5122.03.5WATER BASED18.06.199118151.3520.011.0WATER BASED17.06.199118151.3520.06.5WATER BASED14.06.199118151.3525.012.5WATER BASED17.06.199118181.4019.03.0WATER BASED17.06.199122401.5325.04.5WATER BASED21.06.199122401.5330.05.0WATER BASED25.06.199122401.5122.03.5WATER BASED18.06.199122401.5122.03.5WATER BASED20.06.199122401.5326.03.5WATER BASED20.06.199122401.5330.04.5WATER BASED25.06.199122401.5331.04.5WATER BASED25.06.199122401.5328.05.0WATER BASED25.06.199122401.5329.04.5WATER BASED26.06.199122401.5329.06.0WATER BASED27.06.199124821.5122.03.5WATER BASED20.06.199124951.5326.03.5WATER BASED20.06.199125991.5325.04.5WATER BASED21.06.199127251.5330.05.0WATER BASED25.06.199128121.5330.04.5WATER BASED25.06.199128301.5331.04.5WATER BASED25.06.199128501.2718.03.5WATER BASED01.07.199128501.2718.03.5WATER BASED03.07.199128501.2718.04.0WATER BASED03.07.199128551.5329.06.0WATER BASED27.06.199128551.5329.04.5WATER BASED26.06.199128551.5328.05.0WATER BASED25.06.199129071.2721.07.0WATER BASED01.07.199130541.2718.03.5WATER BASED01.07.1991 -
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