15/12-7 S
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Generell informasjon
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Brønnhistorie
GeneralWell 15/12-7 S was designed to drill in Late Jurassic Oxfordian sandstones on the Theta North prospect in the southeastern part of the PL 116 licence area. The structure is a rotated fault block dipping southeast and bound to the west and north by faults. Based on mapping and inversion studies of the 15/12-5 well and the Beta-east structure it was likely that an Oxfordian sequence was present at the Theta structure. However, it could not be excluded that the Oxfordian reservoir had been eroded from top of the structure. The main objective of well 15/12-7 S was to test the potential for hydrocarbons in the Oxfordian sandstones. A secondary objective was to test possible Triassic sandstones. Seismic anomalies at 441 m and 792 m strongly suggested shallow gas. Because of this the spud location was set outside of the planned location.Operations and resultsWildcat well 15/12-7 S was spudded with the semi-submersible installation Deepsea Bergen on 6 November 1990 and drilled to TD at 3529 m in the Triassic Smith Bank Formation. Problems were encountered in building and dropping angle in deviated well section (13 3/8" to 9 5/8"). Pipe stuck at 2703 m and 2720m but came free. Stuck again with FMT-tool at 3425m. The tool was left in the hole. The well was drilled with seawater and bentonite pills down to 173 m, with seawater and CMC EHV from 173 m to 620 m, with gypsum/PAC from 620 m to 3027 m, and with gel/polymer/lignosulphonate from 3027 m to TD. No shallow gas was encountered at 441 m, but from MWD gas was encountered at 775 m. Several misruns while logging were experienced.The Oxfordian reservoir sandstone (Intra Heather Sandstone) came in at 3025 m, 25.5 m shallower than prognosed. No hydrocarbons were encountered. One 27 m conventional core was cut from 3028 m to 3055 m in the reservoir unit with 94.4 % recovery. A total of 100 sidewall cores were attempted of which 93 were recovered. No sidewall cores were attempted in the 17 1/2" section (620 m to 1820 m) due to hole problems. No fluid samples were taken in the well.The well was permanently abandoned on 7 January 1991 as a dry well.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]630.003570.00 -
Borekjerner i Sokkeldirektoratet
Borekjerner i Sokkeldirektoratet Kjerneprøve nummerKjerneprøve - topp dybdeKjerneprøve - bunn dybdeKjerneprøve dybde - enhet13028.03053.5[m ]Borekjerner i Sokkeldirektoratet Total kjerneprøve lengde [m]25.5Borekjerner i Sokkeldirektoratet Kjerner tilgjengelig for prøvetaking?YES -
Kjernebilder
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Palynologiske preparater i Sokkeldirektoratet
Palynologiske preparater i Sokkeldirektoratet Prøve dybdeDybde enhetPrøve typeLaboratorie1827.0[m]SWCSTATO1858.0[m]SWCSTATO1915.0[m]SWCSTATO1945.0[m]SWCSTATO1975.0[m]SWCSTATO1995.0[m]SWCSTATO2020.0[m]SWCSTATO2080.0[m]SWCSTATO2251.0[m]SWCSTATO2288.0[m]SWCSTATO2353.0[m]SWCSTATO2364.0[m]SWCSTATO2375.0[m]SWCSTATO2383.0[m]SWCSTATO2390.0[m]SWCSTATO2408.0[m]SWCSTATO2422.0[m]SWCSTATO2437.0[m]SWCSTATO2494.0[m]SWCSTATO2510.0[m]SWCSTATO2527.0[m]SWCSTATO2542.0[m]SWCSTATO2555.0[m]SWCSTATO2571.0[m]SWCSTATO2585.0[m]SWCSTATO2960.0[m]SWCSTATO2975.0[m]SWCSTATO2983.0[m]SWCSTATO2990.0[m]SWCSTATO2998.0[m]SWCSTATO3005.0[m]SWCSTATO3020.0[m]SWCSTATO3028.0[m]CSTATO3028.3[m]CSTATO3028.7[m]CSTATO3029.3[m]CSTATO3032.5[m]CSTATO3033.0[m]CSTATO3035.6[m]CSTATO3037.6[m]CSTATO3039.9[m]CSTATO3040.0[m]CSTATO3049.0[m]CSTATO3049.5[m]CSTATO3066.0[m]DCSTATO3174.0[m]DCSTATO3234.0[m]DCSTATO3258.0[m]DCSTATO3267.0[m]DCSTATO3270.0[m]DCSTATO3483.0[m]DCSTATO3570.0[m]DCSTATO -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet108112811501284235823582379246025492583258326302685294229422975300830083025303630363477 -
Spleisede logger
Spleisede logger Dokument navnDokument formatDokumentstørrelse [MB]pdf0.60 -
Geokjemisk informasjon
Geokjemisk informasjon Dokument navnDokument formatDokumentstørrelse [MB]pdf1.50 -
Dokumenter – eldre Sokkeldirektoratets WDSS rapporter og andre relaterte dokumenter
Dokumenter – eldre Sokkeldirektoratets WDSS rapporter og andre relaterte dokumenter Dokument navnDokument formatDokumentstørrelse [MB]pdf0.51pdf0.21 -
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk)
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk) Dokument navnDokument formatDokumentstørrelse [MB]PDF16.31 -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]ACBL VDL GR1081795ACBL VDL GR14603010CDL CNL GR CAL17973026CDL GR CAL1681786CST GR18273020CST GR30253502DIFL AC GR SP30143570DIFL ACL GR SP1683021FMT GR30273203FMT GR31453425HR DIPLOG30103570HR DIPLOG GR23503025MWD1793570VELOCITY5002350ZDEN CNL SPL CAL30103569 -
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 formasjonstestCONDUCTOR30168.036170.00.00LOTINTERM.20604.026606.02.08LOTINTERM.13 3/81797.017 1/21800.01.85LOTINTERM.9 5/83014.012 1/43016.01.65LOTOPEN HOLE3570.08 1/23570.00.00LOT -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling10991.2015.0WATER BASED15591.2015.0WATER BASED16931.3015.0WATER BASED18151.3020.0WATER BASED18201.3513.0WATER BASED19591.4518.0WATER BASED21421.5519.0WATER BASED23501.6027.0WATER BASED24511.6025.0WATER BASED24981.6024.0WATER BASED25631.6025.0WATER BASED26251.6021.0WATER BASED26381.6025.0WATER BASED27581.6026.0WATER BASED27671.6026.0WATER BASED27991.6038.0WATER BASED28351.6028.0WATER BASED28611.6027.0WATER BASED29171.6027.0WATER BASED29801.6029.0WATER BASED30201.3144.0WATER BASED30261.6025.0WATER BASED30661.3020.0WATER BASED35701.3144.0WATER BASED -
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]pdf0.22