25/11-15
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Generell informasjon
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Brønnhistorie
GeneralWell 25/11-15 was drilled east of the Balder Field complex on the Utsira High in the North Sea. The main objective was to test the hydrocarbon potential of the Paleocene Heimdal Sand in the Hermod prospect.Operations and resultsWildcat well 25/11-15 was spudded with the semi-submersible installation Transocean 8 on 10 November 1991 and drilled to TD at 2035 m in the Early Jurassic Statfjord Formation. Due to shallow gas warning an 8 1/2" pilot was drilled from 239 to 390 m. No shallow gas was found. The well was drilled with seawater and viscous bentonite sweeps down to 1312 m and with KCl/PHPA/Polymer mud from 1312 m to TD.The Balder Formation was encountered at 1660 m. It contained rare sandstone stringers close to the top and these had good oil shows. This was the only oil show recorded outside of the Heimdal Formation. A 64 m thick Heimdal Formation Sandstone was penetrated from 1734 m to 1798 m. The sandstone was oil bearing down to a well-defined OWC at 1787 m. The net pay thickness was 51.88 m with an average porosity of 34.5% and an average Sw of 12.5%.Seven cores were cut from 1680 m to 1799 m, starting 7 m below the top Sele Formation and ending 1 m below the base of the Heimdal Formation. A total of 20 good RFT pressure points were recorded giving a fluid density of 0.86 g/cc in the hydrocarbon bearing zone. Two fluid samples were attempted, but were abandoned after problems with sand plugging.The well was permanently abandoned on 25 December 1991 as an oil Discovery.TestingA single production test was performed over the interval 1736 - 1775 m in the Heimdal Formation. The well flowed 525 Sm3 oil and 7500 Sm3 gas /day through a 25.4 mm choke. The GOR was 14 Sm3/Sm3 and the oil was 0.940 g/cm3. The gas gravity was 0.640 with 0.3% CO2 and 0.2 ppm H2S. The bottom hole temperature, recorded at 1695.08 m gauge depth, was 76.6 deg C. -
Borekaks i Sokkeldirektoratet
Borekaks i Sokkeldirektoratet Borekaks tilgjengelig for prøvetaking?YESBorekaks i Sokkeldirektoratet Borekaksprøve, topp dybde [m]Borekaksprøve, bunn dybde [m]1320.002035.00 -
Borekjerner i Sokkeldirektoratet
Borekjerner i Sokkeldirektoratet Kjerneprøve nummerKjerneprøve - topp dybdeKjerneprøve - bunn dybdeKjerneprøve dybde - enhet11680.01696.0[m ]21696.81705.8[m ]31708.01728.0[m ]41728.01740.0[m ]51740.51762.6[m ]61762.61781.1[m ]71781.11796.6[m ]Borekjerner i Sokkeldirektoratet Total kjerneprøve lengde [m]113.1Borekjerner i Sokkeldirektoratet Kjerner tilgjengelig for prøvetaking?YES -
Kjernebilder
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Palynologiske preparater i Sokkeldirektoratet
Palynologiske preparater i Sokkeldirektoratet Prøve dybdeDybde enhetPrøve typeLaboratorie1325.0[m]SWCHYDRO1350.0[m]SWCHYDRO1375.0[m]SWCHYDRO1425.0[m]SWCHYDRO1460.0[m]SWCHYDRO1485.0[m]SWCHYDRO1495.0[m]SWCHYDRO1497.0[m]SWCHYDRO1570.0[m]SWCHYDRO1605.0[m]SWCHYDRO1617.0[m]SWCHYDRO1640.0[m]SWCHYDRO1652.0[m]SWCHYDRO1675.0[m]SWCHYDRO1678.0[m]SWCHYDRO1680.0[m]CHYDRO1684.0[m]CHYDRO1689.0[m]CHYDRO1694.0[m]CHYDRO1696.9[m]CHYDRO1703.0[m]CHYDRO1707.0[m]SWCHYDRO1708.2[m]CHYDRO1713.0[m]CHYDRO1717.0[m]CHYDRO1722.0[m]CHYDRO1726.4[m]CHYDRO1730.9[m]COD1732.0[m]CHYDRO1732.8[m]COD1735.6[m]CHYDRO1741.2[m]CHYDRO1749.0[m]CHYDRO1756.0[m]CHYDRO1764.0[m]CHYDRO1770.5[m]CHYDRO1777.5[m]CHYDRO1784.9[m]CHYDRO1784.9[m]COD1791.4[m]CHYDRO1792.8[m]CHYDRO1796.0[m]CHYDRO1815.0[m]SWCHYDRO1850.0[m]SWCHYDRO1952.0[m]SWCHYDRO1964.0[m]SWCHYDRO1988.0[m]SWCHYDRO1989.3[m]SWCHYDRO1990.8[m]SWCHYDRO -
Oljeprøver i Sokkeldirektoratet
Oljeprøver i Sokkeldirektoratet Test typeFlaske nummerTopp dyp
MD [m]Bunn dyp
MD [m]Væske typeTest tidspunktPrøver tilgjengeligDSTDST11736.001775.0018.12.1991 - 00:00YES -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet151652750798798101810321108149115061660166016741678173417981807181818181867189319041926192619421954197819781983 -
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]pdf0.51pdf0.15 -
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk)
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk) Dokument navnDokument formatDokumentstørrelse [MB]pdf17.18 -
Borestrengtester (DST)
Borestrengtester (DST) Test nummerFra dybde MD
[m]Til dybde MD
[m]Reduksjonsventil størrelse
[mm]1.01736177425.4Borestrengtester (DST) Test nummerEndelig avstengningstrykk
[MPa]Endelig strømningstrykk
[MPa]Bunnhullstrykk
[MPa]Borehullstemperatur
[°C]1.076Borestrengtester (DST) Test nummerOlje produksjon
[Sm3/dag]Gass produksjon
[Sm3/dag]Oljetetthet
[g/cm3]Gasstyngde rel. luftGOR
[m3/m3]1.052575000.9400.64014 -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]CST12902006DIL LSS GR SP AMS2381259DIL LSS GR SP AMS12742018DLL MSFL LDL CNL NGL SP AMS12742016MWD - GR RES DIR1502035RFT GR AMS14851504RFT GR AMS16611997RFT GR AMS17351736SHDT GR AMS12742021VSP5702010 -
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 formasjonstestCONDUCTOR30237.036240.00.00LOTINTERM.9 5/81273.012 1/41275.01.71LOT -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling2381.2019.08.0WATER BASED12.11.19912391.2019.08.0WATER BASED12.11.19914501.2018.04.0WATER BASED13.11.199113121.2018.09.0WATER BASED14.11.199113121.2219.015.0WATER BASED19.11.199113121.2019.011.0WATER BASED19.11.199113121.2018.08.0WATER BASED15.11.199115301.1320.014.0WATER BASED19.11.199116971.1517.08.0WATER BASED19.11.199117261.1616.09.0WATER BASED20.11.199117261.1616.09.0WATER BASED22.11.199117681.1915.09.0WATER BASED28.11.199117691.2014.011.0WATER BASED29.11.199117691.2014.012.0WATER BASED02.12.199117691.3520.014.0WATER BASED02.12.199117691.2915.09.0WATER BASED02.12.199117691.2915.010.0WATER BASED03.12.199117691.2915.09.0WATER BASED04.12.199117691.2113.07.0WATER BASED05.12.199117761.2617.016.0WATER BASED06.12.199117761.2719.014.0WATER BASED10.12.199117761.2718.013.0WATER BASED10.12.199117761.2718.014.0WATER BASED11.12.199117761.2614.013.0WATER BASED11.12.199117761.2614.013.0WATER BASED13.12.199117761.2614.013.0WATER BASED16.12.199117761.2614.013.0WATER BASED16.12.199117761.2614.013.0WATER BASED17.12.199117761.2614.013.0WATER BASED18.12.199117761.2514.013.0WATER BASED19.12.199117761.2514.013.0WATER BASED20.12.199117761.2512.010.0WATER BASED23.12.199117761.2819.015.0WATER BASED10.12.199117761.2614.013.0WATER BASED12.12.199117761.2614.013.0WATER BASED16.12.199117811.1516.09.0WATER BASED22.11.199117811.1516.09.0WATER BASED21.11.199119061.1818.011.0WATER BASED22.11.199120351.1816.010.0WATER BASED25.11.199120351.1816.09.0WATER BASED27.11.199120351.1617.010.0WATER BASED25.11.199120351.1714.08.0WATER BASED25.11.199120351.1817.010.0WATER BASED26.11.1991 -
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]pdf0.21