9/4-1
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Generell informasjon
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Brønnhistorie
GeneralWell 9/4-1 is situated northeast in the Åsta Graben in the Danish-Norwegian Basin. The chosen well location allowed multiple Tertiary to Mesozoic prospects to be tested. The primary objectives of 9/4-1 were Middle Jurassic and Early Triassic (Bunter) sandstones, while basal Tertiary and Early Cretaceous sandstones and Late Cretaceous limestones were secondary objectives.The well is Type Well for the Egersund Formation.Operations and resultsWildcat well 9/4-1 was spudded with the jack-up installation Endeavour on 31 Marc 1968 and drilled to TD at 2963 m in Late Permian Zechstein salt. Three casing strings were set in the hole. Seawater was used as drilling fluid down to 1106 m, from where an XP-20 lignosulphonate type mud was used. When the drilling commenced after the 30" conductor pipe was set, several drilling problems arose. The circulation was lost, and the hole fell in repeatedly, so the conductor pipe had to be re-driven and cemented several times until the hole conditions allowed the 20" casing to be set. At 2963 m the drill pipe stuck in salt, and after five days of unsuccessful fishing operations, it was decided to abandon the hole. The lower part of the hole could not be logged due to the unrecovered fish.Twenty-five net meter of Jurassic sandstone was penetrated in a sand body (Sandnes Formation) at 2288 m. The section was water wet, but fair shows were logged in the upper 5 m of the sand. The remainder had very scattered poor shows. Porosity averaged 25 percent and examination of sidewall cores indicated a clean permeable sandstone reservoir. The second primary objective, the Bunter Sandstone, was represented by an estimated 60 m of thin interbedded sands and sandstones scattered throughout a thick Triassic section composed predominantly of silty red brown to pastel claystones. Due to lack of logs the interpretation of the Triassic section is somewhat tentative. Late Cretaceous Chalk and Early Cretaceous sandstones proved non- productive due to either the absence of the predicted lithologies or the non-development of reservoir properties in the sediments present. There were no shows in the Triassic or in the secondary target sections. Organic geochemical analyses show excellent source properties in the Late Jurassic Tau Formation with 6 - 7 % TOC and hydrogen index around 250 mg HC/g TOC. Colas and shale in the underlying Vestland and Bryne Formations also show good source potentials. Vitrinite data indicate top oil window maturity already at ca 2000 m.No conventional cores were cut. Sixty-nine out of 73 attempted sidewall cores were retrieved over the interval 2196 m to 2415 m in the Jurassic and Triassic sections. No fluid samples were taken.The well was permanently abandoned on 19 May 1968 as a dry hole with shows.TestingNo drill stem test was performed. -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet97518112711271154117412301269133613361365169018041811181118221847198519852047220022512288228823192329232925902939 -
Spleisede logger
Spleisede logger Dokument navnDokument formatDokumentstørrelse [MB]pdf0.24 -
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]pdf0.20 -
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk)
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk) Dokument navnDokument formatDokumentstørrelse [MB]pdf0.80pdf1.55 -
Dokumenter – Sokkeldirektoratets publikasjoner
Dokumenter – Sokkeldirektoratets publikasjoner Dokument navnDokument formatDokumentstørrelse [MB]pdf13.95 -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]BHC GR3331006BHC GR9752416FDC10922419GR300333IES3331106IES10922419 -
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 formasjonstestCONDUCTOR36144.048146.00.00LOTSURF.COND.20334.026335.00.00LOTINTERM.13 3/81092.017 1/21094.00.00LOTOPEN HOLE2963.012 1/42963.00.00LOT -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling11061.02seawater22521.23Spersene XP29631.25Spersene XP