2/7-9
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Generell informasjon
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Brønnhistorie
GeneralWell 2/7-9 is located in the Ål Basin south of the Eldfisk structure in the southern North Sea. The main purpose of the well was to test Danian -Cretaceous limestone and Jurassic sandstone on a north-south trending anticline 6 - 8 km south of Eldfisk, where these intervals had proven commercial oil in several wells.Operations and resultsAppraisal well 2/7-9 was spudded with the jack-up installation Zapata Nordic on 25 December 1973 and drilled to TD 4448 m in Devonian sediments.Appraisal well 2/7-9 was spudded with the jack-up installation Zapata Nordic on 25 December 1973 and drilled to TD 4448 m in Devonian sediments. The Danian Limestone (Ekofisk Formation) came in at 3086 m. It was expected to be 90 m thick while 77 m was found. The Late Cretaceous Chalk (Cromer Knoll Group) was anticipated to be 695 m thick, but a greater thickness of 800 m was found. Good shows were seen in both intervals, but no hydrocarbons were produced when tested. Sands initially dated Late Jurassic were encountered at 4313 m and proved to be hydrocarbon bearing with a 111 m pay section with average porosity of 13% and 55% oil saturation. A clear OWC was found at 4424 m.These sands have later been interpreted as of Devonian age.No cores were cut and no wire line fluid samples were taken.The well was permanently abandoned on 10 April 1974.TestingThree drill stem tests were conducted in the well.DST 1 tested the interval 4313 to 4356 m in the Devonian sandstones. It produced, after acidization, 36 Sm3 oil and 10000 Sm3 gas /day through a 32/64" choke. The GOR was 278 Sm3/Sm3 and the oil gravity was 45 deg API.DST 2 in the interval 3417 to 3436 m in Late Cretaceous limestone (Tor Formation). It produced no hydrocarbons to surface only 1.6 m3 load water. Samples of formation fluid were taken while reversing out the string content.DST 3 in the interval 3098 to 3109 m in Danian Limestone (Ekofisk Formation). It produced no hydrocarbons to surface only 1 m3 load water. -
Borekaks i Sokkeldirektoratet
Borekaks i Sokkeldirektoratet Borekaks tilgjengelig for prøvetaking?YESBorekaks i Sokkeldirektoratet Borekaksprøve, topp dybde [m]Borekaksprøve, bunn dybde [m]1234.444447.95 -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet108294929492968301130863086316335783891389839623962407640764311 -
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]pdf0.26 -
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk)
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk) Dokument navnDokument formatDokumentstørrelse [MB]pdf2.74pdf26.38 -
Dokumenter – Sokkeldirektoratets publikasjoner
Dokumenter – Sokkeldirektoratets publikasjoner Dokument navnDokument formatDokumentstørrelse [MB]pdf72.88pdf0.54pdf0.56 -
Borestrengtester (DST)
Borestrengtester (DST) Test nummerFra dybde MD
[m]Til dybde MD
[m]Reduksjonsventil størrelse
[mm]1.0431343560.02.0341734360.03.0309831090.0Borestrengtester (DST) Test nummerEndelig avstengningstrykk
[MPa]Endelig strømningstrykk
[MPa]Bunnhullstrykk
[MPa]Borehullstemperatur
[°C]1.038.4002.03.0Borestrengtester (DST) Test nummerOlje produksjon
[Sm3/dag]Gass produksjon
[Sm3/dag]Oljetetthet
[g/cm3]Gasstyngde rel. luftGOR
[m3/m3]1.03699960.8002782.03.0 -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]BHC12264454CBL27433450CDM27454455CDM AP27454455FDC30114455IES12264455ML MLL40714454PML C30113970SNP30113970SRS12264454 -
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 formasjonstestCONDUCTOR30145.036146.00.00LOTSURF.COND.20501.026511.00.00LOTINTERM.13 3/81226.017 1/21228.00.00LOTINTERM.9 5/82745.012 1/42752.00.00LOTLINER74064.08 1/24075.00.00LOTOPEN HOLE4448.05 7/84448.00.00LOT -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling25231.85waterbased28921.72waterbased29411.72waterbased33531.71waterbased34011.89waterbased