25/1-1
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Generell informasjon
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Brønnhistorie
GeneralWell 25/1-1 was drilled in the middle of block 25/1 in the Viking Graben, close to the UK border. Seismic surveys had defined structural closure at several levels in Mesozoic and into lower Tertiary horizons. At Paleocene level an "amoeboid" feature extending as much as 350 km2 with a vertical closure of 180 m was mapped. The primary objective of the well was to test the hydrocarbon potential of the Early Tertiary, interpreted to be a deltaic sand build-up. Secondary objective was Jurassic sandstones.The well is Type Well for the Frigg, Svarte, Blodøks, Tryggvason, Kyrre, and Jorsalfare Formations.Operations and resultsWildcat well 25/1-1 was spudded with the semi-submersible installation Pentagone 81 on 30 March 1971 and drilled to TD at 4570 m in Middle Jurassic Hugin Formation. The well was drilled with a seawater/LFC mud system down to TD.Apart from sandy sections in the Nordland Group, the lithology down to top Frigg Formation at 1836 m was mainly claystones. The Frigg Formation sandstones had porosities in the range 30 to 40% with permeabilities of several Darcy. It was hydrocarbon bearing with a gas/oil contact at 1972 m, and an oil/water contact at 1992 m. Further shows were seen in a thin sand at 2470 m in the Lista Formation. An FIT sample recovered a small amount of oil from this sand. Oil shows were also recorded on limestone on core K5 in the Jorsalfare Formation. The Jurassic sequence penetrated by the well was mainly shales of the Viking Group and only 10 m of Hugin Formation sand at TD. No shows were reported from the Hugin Formation.Six conventional cores were cut. Cores K1 to K3 were cut from 1868 to 1910 m in the Frigg Formation. K4 was cut from 2687 to 2696 m in the lower Lista Formation, while K5 and K6 were cut from 2826 to 2843 m and from 2993 m to 2997.5 m in the Jorsalfare Formation. Wire line fluid sampling was attempted at nine different depths. Hydrocarbon fluids were recovered from four levels: 1893 m (gas and filtrate), 1927.5 m (gas and filtrate), 1973.5 m (gas, filtrate and a small amount of oil), and 2471 m (filtrate and a small amount of oil).The well was permanently abandoned on 22 July 1971 as an oil and gas discovery.TestingA production test was carried through perforations between 1920 and 1928 m on gas bearing Frigg Formation sands. The test produced 674000 Sm3 gas /day. -
Borekaks i Sokkeldirektoratet
Borekaks i Sokkeldirektoratet Borekaks tilgjengelig for prøvetaking?NOBorekaks i Sokkeldirektoratet Borekaksprøve, topp dybde [m]Borekaksprøve, bunn dybde [m]1120.004558.00 -
Borekjerner i Sokkeldirektoratet
Borekjerner i Sokkeldirektoratet Kjerneprøve nummerKjerneprøve - topp dybdeKjerneprøve - bunn dybdeKjerneprøve dybde - enhet11871.01877.0[m ]21891.51895.0[m ]31900.01910.0[m ]42687.02696.0[m ]52826.02843.1[m ]62993.02997.5[m ]Borekjerner i Sokkeldirektoratet Total kjerneprøve lengde [m]50.1Borekjerner i Sokkeldirektoratet Kjerner tilgjengelig for prøvetaking?YES -
Palynologiske preparater i Sokkeldirektoratet
Palynologiske preparater i Sokkeldirektoratet Prøve dybdeDybde enhetPrøve typeLaboratorie1360.0[m]DC1370.0[m]DC1430.0[m]DC1450.0[m]DC1490.0[m]DC1500.0[m]DC1780.0[m]DC1790.0[m]DC1830.0[m]DC1840.0[m]DC1876.0[m]CIGS2126.0[m]DC2140.0[m]DC2225.0[m]DC2245.0[m]DC2426.0[m]DC2445.0[m]DC2465.0[m]DC2526.0[m]DC2541.0[m]DC2601.0[m]DCOD2622.0[m]DCOD2640.0[m]DCOD2640.0[m]DC2657.0[m]DCOD2665.0[m]DC2679.0[m]DCOD2682.0[m]DC2690.0[m]CIGS2691.1[m]COD2694.7[m]COD2695.0[m]CIGS2720.0[m]DCOD2723.0[m]DC2740.0[m]DCOD2760.0[m]DCOD2778.0[m]DCOD2800.0[m]DCOD2829.3[m]COD2830.1[m]COD2831.9[m]COD2833.7[m]COD2835.5[m]COD2837.3[m]COD2839.1[m]COD2840.9[m]COD2842.7[m]COD2860.0[m]DCOD2874.0[m]DCOD2882.0[m]DCOD2993.5[m]COD2996.2[m]COD3012.0[m]DCOD3039.0[m]DCOD3071.0[m]DCOD3103.0[m]DCOD3146.0[m]DCOD3174.0[m]DCOD3205.0[m]DCOD3226.0[m]DCOD3250.0[m]DCOD3276.0[m]DCOD3300.0[m]DCOD3327.0[m]DCOD3351.0[m]DCOD3378.0[m]DCOD3398.0[m]DCOD3426.0[m]DCOD3449.0[m]DCOD3473.0[m]DCOD3497.0[m]DCOD3501.0[m]DCOD3525.0[m]DCOD3553.0[m]DCOD3577.0[m]DCOD3601.0[m]DCOD3625.0[m]DCOD3649.0[m]DCOD3676.0[m]DCOD3696.0[m]DCOD3731.0[m]DCOD3751.0[m]DCOD3772.0[m]DCOD3800.0[m]DCOD3828.0[m]DCOD3858.0[m]DCOD3878.0[m]DCOD3900.0[m]DCOD3924.0[m]DCOD3952.0[m]DCOD3976.0[m]DCOD3996.0[m]DCOD4024.0[m]DCOD4052.0[m]DCOD4076.0[m]DCOD4100.0[m]DCOD4124.0[m]DCOD4152.0[m]DCOD4176.0[m]DCOD4196.0[m]DCOD4228.0[m]DCOD4248.0[m]DCOD4300.0[m]DCOD4356.0[m]DCOD4404.0[m]DCOD4452.0[m]DCOD4504.0[m]DCOD4524.0[m]DCOD4558.0[m]DCOD -
Oljeprøver i Sokkeldirektoratet
Oljeprøver i Sokkeldirektoratet Test typeFlaske nummerTopp dyp
MD [m]Bunn dyp
MD [m]Væske typeTest tidspunktPrøver tilgjengeligDST0.000.00WATER06.07.1971 - 00:00YES -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet125731183621152115214521952218222822452389271127112997358237903807399539954065413542034203428045604560 -
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]pdf0.16 -
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk)
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk) Dokument navnDokument formatDokumentstørrelse [MB]pdf2.44pdf0.52PDF0.33PDF60.60PDF0.66PDF20.81PDF0.34PDF4.79PDF3.51PDF1.11PDF0.70PDF3.62PDF1.34PDF2.83 -
Borestrengtester (DST)
Borestrengtester (DST) Test nummerFra dybde MD
[m]Til dybde MD
[m]Reduksjonsventil størrelse
[mm]1.0192019280.0Borestrengtester (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]1.0674000 -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]BHC GR4594453CBL3504063CBL GR12002947DLL18354140FDC GR18352850HDT18354059HRT10002920IES4602100ML MLL18352855SNP18352850SRS4594453 -
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 formasjonstestCONDUCTOR30165.036165.00.00LOTSURF.COND.20459.026490.00.00LOTINTERM.13 3/81835.017 1/21846.00.00LOTINTERM.9 5/82950.012 1/42960.00.00LOTPROD.74062.08 1/24063.00.00LOT -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling01.6865.0waterbased4901.2565.0waterbased18461.3060.0waterbased23711.2544.0waterbased31951.6556.0waterbased40291.6865.0waterbased44551.9060.0waterbased -
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]pdf0.21