7/12-5
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Generell informasjon
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Brønnhistorie
GeneralWell 7/12-5 was drilled ca 4 km northwest of the Ula Field in the North Sea. The objective was to test the hydrocarbon potential in Late Jurassic Sandstones. Secondary objectives were Early Jurassic and Triassic sandstones.Operations and resultsWildcat well 7/12-5 was spudded with the semi-submersible installation Borgsten Dolphin 6 February 1981 and drilled to TD at 4440 m in the Late Permian Zechstein Group. There were some problems with drilling the section from 2851 to 3741 m due to junk in hole, otherwise operations proceeded without significant problems. The well was drilled with sea water and hi-vis pills and gel down to 467 m and with gypsum/lignosulphonate/CMC mud from 467 m to TD.The Mandal Formation was penetrated at 3731 m, while the Farsund Formation was penetrated at 3763 m. The Ula Formation was penetrated at 3831 m and consisted of a 69.5 m thick homogenous sandstone, very fine to fine grained with poor reservoir characteristics (porosities from 7 to 14 % and permeabilities from 0.3 to 3 mD). All attempts to obtain reservoir pressures and fluid samples failed due to tight formation. Oil shows were recorded in the upper half of the reservoir and an oil water contact was established at 3872. Log analysis indicated that no significant hydrocarbons were present below the Ula formation where all porous zones calculated high water saturations. Weak shows were recorded in sandstone in the interval 3940 to 3960 m in the Skagerrak Formation. Weak shows were recorded also in siltstone in an isolated sample from 2235 m in the Hordaland Group.Four cores were cut from 3844.5 to 3912.15 m in the Ula, Fjerritslev, and Skagerrak formations. Core depths are 4.8 m deeper than logger's depth. No wire line fluid samples were taken.The well was permanently abandoned on 7 June 1981 as an oil discovery.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]180.004436.00 -
Borekjerner i Sokkeldirektoratet
Borekjerner i Sokkeldirektoratet Kjerneprøve nummerKjerneprøve - topp dybdeKjerneprøve - bunn dybdeKjerneprøve dybde - enhet13844.53862.7[m ]23862.73876.4[m ]33876.33894.3[m ]43894.33912.2[m ]Borekjerner i Sokkeldirektoratet Total kjerneprøve lengde [m]67.8Borekjerner i Sokkeldirektoratet Kjerner tilgjengelig for prøvetaking?YES -
Kjernebilder
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Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet99165026452645268627342866291229123058328933223323333233323528373137313763383138313901391741454393 -
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]pdf0.10pdf0.31 -
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk)
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk) Dokument navnDokument formatDokumentstørrelse [MB]pdf14.39 -
Borestrengtester (DST)
Borestrengtester (DST) Test nummerFra dybde MD
[m]Til dybde MD
[m]Reduksjonsventil størrelse
[mm]1.04185419714.3Borestrengtester (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]1.04701180000.8280.876251 -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]CBL VDL CCL981818CST37324113DLL MSFL GR SP CAL37334043FDC CNL GR SP CAL36954432HDT37184116HRT981804ISF BHC GR SP98463ISF BHC GR SP37374430ISF BHC GR SP MSFL4543738ISF BHC GR SP MSFL40564113 -
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 formasjonstestCONDUCTOR30182.036188.00.00LOTSURF.COND.20456.026467.01.99LOTINTERM.13 3/81658.017 1/21670.51.83LOTINTERM.9 5/83732.012 1/43740.02.06LOTOPEN HOLE4440.08 1/24440.00.00LOT -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling1881.05WATER BASED03.06.19813251.08WATER BASED03.06.19814671.29WATER BASED03.06.19815091.15WATER BASED03.06.19818491.16WATER BASED03.06.198110291.17WATER BASED03.06.198112461.22WATER BASED03.06.198116701.40WATER BASED03.06.198119241.42WATER BASED03.06.198120851.42WATER BASED03.06.198121661.42WATER BASED03.06.198122241.42WATER BASED03.06.198124141.43WATER BASED03.06.198128351.48WATER BASED03.06.198130061.48WATER BASED03.06.198131131.48WATER BASED03.06.198134171.48WATER BASED03.06.198137411.50WATER BASED03.06.198141931.50WATER BASED03.06.198142491.50WATER BASED03.06.198143321.49WATER BASED03.06.198144401.50WATER BASED03.06.1981