34/10-8
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Generell informasjon
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Brønnhistorie
GeneralWell 34/10-8 was drilled on the southern part of the Gullfaks Field. The primary objective was to test sandstones of Middle Jurassic age. Secondary objectives were sandstones in the Early Jurassic.Operations and resultsAppraisal well 34/10-8 was spudded with the semi-submersible installation Deepsea Saga on 8 March and drilled to TD at 2214 m in the Early Jurassic Cook Formation. Some problems with lost circulation was encountered when circulating prior to cementing the 13 3/8" casing. Also the drill string became stuck during plug back operations at 2037 m and 9 days were lost when fishing for it. The well was drilled with Gel/spud mud down to 875 m and with gel/lignosulphonate from 875 m to TD.The Middle Jurassic Brent Group sandstones came in with Tarbert Formation on top at 1821 m and the Ness Formation at 1853 m. The Tarbert and Ness formations were hydrocarbon-bearing with a 151 m gross pay zone from1821 to 1972 m. The Early Jurassic sandstones of the Cook Formation were water saturated. Above the reservoir good oil shows were recorded on limestone from 1712 to 1745 m and on limestone/mudstone/siltstone from 1665 to 1705 m. Otherwise traces of oil shows were recorded above the reservoir up to a depth of 1220 m. No shows were recorded below the oil bearing reservoir.A total of 13 cores were taken from 1823 to 1976 m, with a total recovery of 140 m. The RFT tool was run in the Brent sand and good data was obtained from 1826 to 2006 m. Fifteen out of seventeen tests were successful. In the Ness zone a fluid sample was taken at 1950 m.The well was permanently abandoned on 25 May 1980 as an oil appraisal well.TestingThe well was perforated and tested in the interval 1869 to 1873 m in the Brent Group, Ness Formation. The test produced 498 Sm3 oil and 33900 Sm3 gas /day. The GOR was 68 Sm3/Sm3, the oil gravity was 29.5 deg API, and the gas gravity was 0.622 (air = 1). After the flow test an injection test was performed, indicating a fracture pressure of ca 5500 psig. -
Borekaks i Sokkeldirektoratet
Borekaks i Sokkeldirektoratet Borekaks tilgjengelig for prøvetaking?YESBorekaks i Sokkeldirektoratet Borekaksprøve, topp dybde [m]Borekaksprøve, bunn dybde [m]230.002216.00 -
Borekjerner i Sokkeldirektoratet
Borekjerner i Sokkeldirektoratet Kjerneprøve nummerKjerneprøve - topp dybdeKjerneprøve - bunn dybdeKjerneprøve dybde - enhet11823.01828.5[m ]21828.51832.5[m ]31839.01851.5[m ]41856.51860.8[m ]51861.51869.0[m ]61877.01883.6[m ]71885.01898.5[m ]81898.51908.5[m ]91908.51925.0[m ]101925.01939.5[m ]111939.51956.0[m ]121956.01956.6[m ]131964.01975.8[m ]Borekjerner i Sokkeldirektoratet Total kjerneprøve lengde [m]123.8Borekjerner 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 tilgjengeligDSTDST 11845.001848.0017.05.1980 - 00:00YES -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet1589339461096136515341534157517191719182118211853197520052040205420542133 -
Dokumenter – eldre Sokkeldirektoratets WDSS rapporter og andre relaterte dokumenter
Dokumenter – eldre Sokkeldirektoratets WDSS rapporter og andre relaterte dokumenter Dokument navnDokument formatDokumentstørrelse [MB]pdf0.13pdf0.17 -
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk)
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk) Dokument navnDokument formatDokumentstørrelse [MB]pdf1.31pdf22.29pdf8.43pdf2.72pdf2.15pdf26.84pdf1.44pdf2.10pdf3.06pdf0.20pdf0.45pdf3.42pdf1.09 -
Borestrengtester (DST)
Borestrengtester (DST) Test nummerFra dybde MD
[m]Til dybde MD
[m]Reduksjonsventil størrelse
[mm]1.01845184812.7Borestrengtester (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]1.05010.882117 -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]CBL6001727CBL VDL15821877CST17482210DLL MSFL GR18002017FDC CAL GR8581483FDC CNL GR14701744HDT17322216ISF SON GR SP2162216 -
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 formasjonstestCONDUCTOR30216.036216.00.00LOTSURF.COND.20858.026875.01.63LOTINTERM.13 3/81470.017 1/21483.01.75LOTINTERM.9 5/81735.012 1/41745.01.90LOTLINER71917.08 1/22216.00.00LOT -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling2001.0890.0waterbased7551.0945.0waterbased8251.1039.0waterbased10251.0844.0waterbased13501.2644.0waterbased15501.6546.0waterbased16101.7248.0waterbased17351.8053.0waterbased -
Tynnslip i Sokkeldirektoratet
Tynnslip i Sokkeldirektoratet DybdeEnhet1840.00[m ]1828.00[m ]1842.00[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]pdf0.21