15/12-4
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Generell informasjon
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Brønnhistorie
Wildcat well 15/12-4 is located on the Maureen Terrace in the South Viking Graben in the North Sea. The primary objectives were the Palaeocene Heimdal Formation and sandstones of Jurassic and Triassic age. Secondary objectives were the Frigg Formation and fractured limestone in the Cretaceous.Operations and resultsWell 15/12-4 was spudded with the semi-submersible installation Deepsea Bergen on 13 September 1984 and drilled to TD at 3157 m, 17 m into the Triassic Group. Operations were completed within the time schedule and with very few problems. The well was drilled with seawater and gel down to 505 m, with gypsum polymer from 505 m to 2680 m, and with lignosulphonate from 2680 m to TD.No Heimdal or Frigg sands were encountered in the well. From logs and cores hydrocarbons were seen in the uppermost part of the Cretaceous chalk in the interval 2490 ? 2515 m. Core analysis and log analysis indicated very poor reservoir properties in this chalk. The water saturation was high (60 - 80 %) and the permeability was extremely low (0.01 - 0.5 mD). A 1.5 meter oil column was seen in the Jurassic sandstone, from 2911.5 to 2913 m with a transition zone down to 2915.5. Apart from these two intervals there were no shows or other hydrocarbon indications in the well.Four cores were cut, one in the Palaeocene, two in the Late Cretaceous and one in the Late Jurassic sequence. One FMT run was made in the Cretaceous. Here, no pressure points out of 19 attempts were successful due to seal failure and very low permeability in the formation. One attempt to get sample at 2439.5 m failed due to tight formation. In the Jurassic a segregated FMT sample was taken at 2912 m (5.8 l oil with a density of 0.847 g/cm3 in the 2 3/4 gallon chamber) and a second segregated sample at 2913.5 m (0.5 l oil and 9 l water/mud filtrate in the 2 3/4 gallon chamber).The well was permanently abandoned on 31 October 1984 as an oil discovery.TestingNo drill stem test was performed. -
Borekaks i Sokkeldirektoratet
Borekaks i Sokkeldirektoratet Borekaks tilgjengelig for prøvetaking?YESBorekaks i Sokkeldirektoratet Borekaksprøve, topp dybde [m]Borekaksprøve, bunn dybde [m]180.003157.50 -
Borekjerner i Sokkeldirektoratet
Borekjerner i Sokkeldirektoratet Kjerneprøve nummerKjerneprøve - topp dybdeKjerneprøve - bunn dybdeKjerneprøve dybde - enhet12439.02449.0[m ]22494.52498.7[m ]32499.02513.6[m ]42902.02919.7[m ]Borekjerner i Sokkeldirektoratet Total kjerneprøve lengde [m]46.5Borekjerner i Sokkeldirektoratet Kjerner tilgjengelig for prøvetaking?YES -
Kjernebilder
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Palynologiske preparater i Sokkeldirektoratet
Palynologiske preparater i Sokkeldirektoratet Prøve dybdeDybde enhetPrøve typeLaboratorie2285.0[m]DC2297.5[m]SWC2307.5[m]SWC2327.5[m]SWC2347.5[m]SWC2367.5[m]SWC2387.5[m]SWC2407.5[m]SWC2427.5[m]SWC2447.5[m]SWC2467.5[m]SWC2477.5[m]SWC2507.5[m]SWC2537.5[m]SWC2567.5[m]SWC2597.5[m]SWC2627.5[m]SWC2657.5[m]SWC2687.5[m]SWC2717.5[m]SWC2747.5[m]SWC2777.5[m]SWC2797.5[m]SWC -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet1101098127823202320233523932464247624762494262127122712273527592784278428922912291231343140 -
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]pdf0.21pdf0.27 -
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk)
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk) Dokument navnDokument formatDokumentstørrelse [MB]pdf21.19pdf12.35pdf2.32pdf0.16pdf1.44pdf0.26pdf0.95pdf0.41pdf0.63pdf1.45pdf1.25pdf2.88pdf1.40pdf1.88pdf1.87pdf1.49pdf2.01pdf1.18pdf3.04pdf2.12 -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]CDL CNL GR CAL15993157CDL GR CAL5041622DIFL BHC AC GR SP CAL1703157DLL MLL GR15993157FMT24382482FMT29013146FMT29112913HR DIP15993157VELOCITY6603150 -
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 formasjonstestCONDUCTOR30171.036173.00.00LOTSURF.COND.20505.026520.01.44LOTINTERM.13 3/81601.017 1/21620.01.84LOTINTERM.9 5/82666.012 1/42680.01.86LOTOPEN HOLE3179.08 1/23179.00.00LOT -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling1101.0355.05.3WATER BASED17.09.19841711.0749.04.5WATER BASED17.09.19842401.0749.04.5WATER BASED17.09.19845201.0846.020.0WATER BASED17.09.19845231.1140.09.6WATER BASED19.09.19847721.1442.010.0WATER BASED20.09.19849451.1447.012.0WATER BASED21.09.198412131.1445.012.0WATER BASED24.09.198414911.1449.013.0WATER BASED24.09.198416201.1444.012.0WATER BASED24.09.198418771.1445.09.0WATER BASED28.09.198422721.1446.09.0WATER BASED01.10.198423741.2044.08.6WATER BASED01.10.198424391.2545.09.1WATER BASED01.10.198424501.2542.08.6WATER BASED02.10.198424951.2545.010.0WATER BASED03.10.198425111.2543.09.1WATER BASED04.10.198425161.2546.09.6WATER BASED05.10.198425841.3042.09.0WATER BASED08.10.198426261.3045.010.0WATER BASED08.10.198426801.3047.010.0WATER BASED08.10.198426801.3044.05.8WATER BASED15.10.198427171.3054.05.8WATER BASED15.10.198427581.3055.05.8WATER BASED15.10.198428031.3555.06.0WATER BASED16.10.198428611.3552.06.0WATER BASED17.10.198429021.3559.05.6WATER BASED18.10.198429201.3560.05.6WATER BASED19.10.198430341.3556.07.0WATER BASED22.10.198431461.3562.06.7WATER BASED22.10.198431571.3576.06.7WATER BASED23.10.198431571.3576.06.7WATER BASED24.10.198431571.3561.06.2WATER BASED22.10.1984 -
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]pdf0.23