7/8-2
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Generell informasjon
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Brønnhistorie
The 7/8-2 (Cero) well was drilled on a domal structure approximately 6 km long by 6 km wide, situated on the Jæren High in the North Sea. It was estimated that at Paleocene depth there would be close to 40 square km of closure with 140 m of vertical relief and at Early Cretaceous depth 27 square km of closure with 150 m of vertical relief. The principal objective horizons were Paleocene, Jurassic and Triassic sands with the Danian-Cretaceous limestone as a possible secondary objective.Operations and resultsWildcat well 7/8-2 was spudded with the semi-submersible installation Ocean Viking on 24 July 1973 and drilled to TD at 3006 m in anhydrite of the Zechstein Group. No significant problems are reported from the operations.The well had no hydrocarbons or shows of hydrocarbons. In the Paleocene no sand beds were developed, although sand was present as a loose, unconsolidated constituent in most of the clays and shales. The Danian and Late Cretaceous limestones were tight. The Late Cretaceous section was 150 m thinner than anticipated due to erosion of the Coniacian to Cenomanian formations at the base. The Jurassic succession was encountered at 2808 m and top Triassic at 2883 m. Two Triassic sands were encountered at 2911 - 2937 m and at 2972 - 2996 m. The Triassic section was thinner than expected, being truncated at 2996 by the Permian Zechstein Group.No cores were cut and no wire line fluid samples were taken in the well.The well was permanently abandoned on 29 August 1973 as a dry well.TestingNo drill stem test was performed. -
Borekaks i Sokkeldirektoratet
Borekaks i Sokkeldirektoratet Borekaks tilgjengelig for prøvetaking?NOBorekaks i Sokkeldirektoratet Borekaksprøve, topp dybde [m]Borekaksprøve, bunn dybde [m]1237.493006.24 -
Palynologiske preparater i Sokkeldirektoratet
Palynologiske preparater i Sokkeldirektoratet Prøve dybdeDybde enhetPrøve typeLaboratorie9160.0[ft]CRRI9190.0[ft]CRRI9220.0[ft]CRRI9250.0[ft]DCRRI9280.0[ft]DCRRI9310.0[ft]DCRRI9340.0[ft]DCRRI9360.0[ft]DCRRI9390.0[ft]DCRRI9420.0[ft]DCRRI9460.0[ft]DCRRI9470.0[ft]DCRRI9490.0[ft]DCRRI9510.0[ft]DCRRI9530.0[ft]DCRRI9550.0[ft]DCRRI9570.0[ft]DCRRI9610.0[ft]DCRRI -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet10814632180218021952295236623662440265728082822288328832997 -
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]pdf0.25 -
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk)
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk) Dokument navnDokument formatDokumentstørrelse [MB]pdf3.81pdf0.85 -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]BHC4381215BHC-C12142256BHC-C22442931BHC-C28963005CDM22442931CDM AP22442931CDM PP22442931CDR22442931FDC23472992GR98438IES4381215IES12112259IES22442930IES28963006VELOCITY4383006 -
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 formasjonstestCONDUCTOR30142.036142.00.00LOTSURF.COND.20437.026450.00.00LOTINTERM.13 3/81209.017 1/21219.00.00LOTINTERM.9 5/82243.012 1/42255.00.00LOTOPEN HOLE3006.08 1/23006.00.00LOT -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling1501.07seawater12201.1345.0seawater22501.5550.0waterbased30001.5555.0waterbased -
Tynnslip i Sokkeldirektoratet
Tynnslip i Sokkeldirektoratet DybdeEnhet9130.00[ft ]