25/4-6 S
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Generell informasjon
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Brønnhistorie
GeneralWell 25/4-6 S was planned to prove the hydrocarbon potential in a structure located on the northern extension of the Heimdal Ridge. The structure is located in the NE corner of block 25/4, fairly close to the Heimdal, Frøy and Frigg Fields. Four-ways closures were mapped on all levels from the "Near top Frigg sequence" marker to the Base Vestland Group Marker. The structure above the Base Cretaceous Unconformity is a fairly simple dome/mounded feature, while the Vestland Group and deeper sections consist of an antithetic tilted block. The objective of the well was to explore all closures down to at least Vestland Group level. The primary target was the Vestland Group; secondary targets were the Frigg and Heimdal Formations, while the Statfjord Formation was a third, optional target. Based on data from surrounding wells, no abnormal pressure was expected. To achieve an optimal position in reaching the targets the well was planned deviated.Operations and resultsWildcat well 25/4-6 S was spudded with the semi-submersible installation West Vanguard on 15 April 1991 and drilled to TD at 4170 m, 41 m into the Statfjord Formation. The well was drilled vertical (max 2 deg deviation) through the Frigg and Heimdal prospects down to 2424 m. From here angle was built up to a maximum of 22.5 deg at 3025 m before it was dropped off again to 3 deg at final TD. The hole opener cone was lost at 266 m resulting in 8 days and 15 hours lost time before drilling could be resumed. The FMT tool got stuck at 3836 m with fishing unsuccessful. Thus it was decided to set a cement plug on top of the tool and perform a sidetrack. The well was drilled with seawater and viscous pills down to 197 m, with bentonite mud from 197 m to 1220 m, with KCl/polymer mud from 1220 m to 2503 m, and with lignosulphonate mud from 2503 m to TD.The Early Eocene Frigg reservoir was not found, and the Palaeocene Heimdal reservoir was water bearing. Top Vestland Group came in at a depth of 3716 m, 37 m deeper than predicted. The group was 222 m thick and hydrocarbon bearing over the uppermost 120 m (hydrocarbon/water contact at 3836 m). The reservoir fluid type was assumed to be a condensate/wet gas with a 0.486 g/cc gradient over the HC-bearing zone, according to the RFT measurements. The Statfjord Formation was water bearing.A total of 12 conventional cores were cut from the Vestland Group, Dunlin Group, and the Statfjord Formation. The mismatch between core depth and logger's depth was large. Core depth had to be added a correction of 8.5 m to 11 m in order to match with the logger's depth. A total of 25 sidewall cores were attempted and 19 were recovered. Two FMT fluid samples were taken, at 3803.5 m in the Hugin Formation and at 4141.5 m in the Statfjord Formation. Both recovered salt water with a small volume of gas.The well was suspended on 24 August 1991 as a gas/condensate discovery.TestingOne DST tests was performed in the interval 3802-3819 m and flowed at a rate of 461700 Sm3/d gas and 688 Sm3/d oil through a 20.64 mm choke. The GOR was 671 Sm3/Sm3 with an oil density of 0.82 g/ml (41 deg API). -
Borekaks i Sokkeldirektoratet
Borekaks i Sokkeldirektoratet Borekaks tilgjengelig for prøvetaking?YESBorekaks i Sokkeldirektoratet Borekaksprøve, topp dybde [m]Borekaksprøve, bunn dybde [m]210.004020.00 -
Borekjerner i Sokkeldirektoratet
Borekjerner i Sokkeldirektoratet Kjerneprøve nummerKjerneprøve - topp dybdeKjerneprøve - bunn dybdeKjerneprøve dybde - enhet13712.03714.3[m ]23715.03733.2[m ]33734.03745.8[m ]43746.03774.0[m ]53774.03790.4[m ]63791.03818.8[m ]73819.03846.3[m ]83846.53873.0[m ]93874.03902.2[m ]104061.04070.0[m ]114124.04131.1[m ]124131.54134.0[m ]Borekjerner i Sokkeldirektoratet Total kjerneprøve lengde [m]205.0Borekjerner i Sokkeldirektoratet Kjerner tilgjengelig for prøvetaking?YES -
Palynologiske preparater i Sokkeldirektoratet
Palynologiske preparater i Sokkeldirektoratet Prøve dybdeDybde enhetPrøve typeLaboratorie2100.0[m]DCPETROSTR2110.0[m]DCPETROS2120.0[m]DCPETROS2130.0[m]DCPETROS2140.0[m]DCPETROS2150.0[m]DCPETROS2160.0[m]DCPETROS2170.0[m]DCPETROS2180.0[m]DCPETROS2190.0[m]DCPETROS2200.0[m]DCPETROS2220.0[m]DCPETROS2240.0[m]DCPETROS2310.0[m]DCPETROS2330.0[m]DCPETROS2340.0[m]DCPETROS2360.0[m]DCPETROS2380.0[m]DCPETROS2390.0[m]DCPETROS2420.0[m]DCPETROS2440.0[m]DCPETROS2450.0[m]DCPETROS2460.0[m]DCPETROS2490.0[m]DCPETROS2510.0[m]DCPETROS2520.0[m]DCPETROS2530.0[m]DCPETROS2545.0[m]DCPETROS2555.0[m]DCPETROS2570.0[m]DCPETROS2580.0[m]DCPETROS2610.0[m]DCPETROS2620.0[m]DCPETROS2630.0[m]DCPETROS2650.0[m]DCPETROS2665.0[m]DCPETROS2685.0[m]DCPETROS2700.0[m]DCPETROS2715.0[m]DCPETROS2730.0[m]DCPETROS2740.0[m]DCPETROS2750.0[m]DCPETROS2846.5[m]CSNEA(P)3680.0[m]DCSNEA(P)3700.0[m]DCSNEA(P)3710.0[m]DCSNEA(P)3712.1[m]CSNEA(P)3713.2[m]CSNEA(P)3715.5[m]CSNEA(P)3716.5[m]CSNEA(P)3717.3[m]CSNEA(P)3718.0[m]DCSNEA(P)3719.5[m]CSNEA(P)3721.0[m]DCSNEA(P)3723.0[m]DCSNEA(P)3725.5[m]CSNEA(P)3727.0[m]DCSNEA(P)3729.4[m]CSNEA(P)3731.0[m]CSNEA(P)3734.0[m]DCSNEA(P)3736.0[m]DCSNEA(P)3738.5[m]CSNEA(P)3740.0[m]CSNEA(P)3742.0[m]DCSNEA(P)3744.0[m]DCSNEA(P)3746.3[m]CSNEA(P)3749.3[m]CSNEA(P)3751.0[m]DCSNEA(P)3753.0[m]DCSNEA(P)3754.9[m]CSNEA(P)3756.0[m]DCSNEA(P)3759.3[m]CSNEA(P)3761.0[m]DCSNEA(P)3763.0[m]DCSNEA(P)3765.0[m]CSNEA(P)3768.0[m]DCSNEA(P)3769.9[m]CSNEA(P)3770.5[m]CSNEA(P)3772.0[m]DCSNEA(P)3774.0[m]DCSNEA(P)3777.0[m]DCSNEA(P)3779.5[m]CSNEA(P)3781.0[m]DCSNEA(P)3783.9[m]CSNEA(P)3784.5[m]CSNEA(P)3784.6[m]CSNEA(P)3785.9[m]CSNEA(P)3787.4[m]CSNEA(P)3788.5[m]CSNEA(P)3789.0[m]DCSNEA(P)3791.0[m]DCSNEA(P)3793.0[m]CSNEA(P)3795.0[m]CSNEA(P)3797.0[m]DCSNEA(P)3799.0[m]DCSNEA(P)3801.0[m]DCSNEA(P)3802.4[m]CSNEA(P)3802.6[m]CSNEA(P)3804.0[m]DCSNEA(P)3806.3[m]CSNEA(P)3810.2[m]CSNEA(P)3811.0[m]DCSNEA(P)3814.0[m]DCSNEA(P)3817.0[m]DCSNEA(P)3819.5[m]CSNEA(P)3820.2[m]CSNEA(P)3820.4[m]CSNEA(P)3822.0[m]CSNEA(P)3825.0[m]DCSNEA(P)3828.0[m]DCSNEA(P)3831.0[m]CSNEA(P)3834.0[m]DCSNEA(P)3835.1[m]CSNEA(P)3835.8[m]CSNEA(P)3837.0[m]CSNEA(P)3840.0[m]CSNEA(P)3843.0[m]CSNEA(P)3849.5[m]CSNEA(P)3852.6[m]CSNEA(P)3855.5[m]CSNEA(P)3858.5[m]CSNEA(P)3862.5[m]CSNEA(P)3864.1[m]CSNEA(P)3864.3[m]CSNEA(P)3864.5[m]CSNEA(P)3864.8[m]CSNEA(P)3865.3[m]CSNEA(P)3866.3[m]CSNEA(P)3866.5[m]CSNEA(P)3869.5[m]CSNEA(P)3873.0[m]CSNEA(P)3875.0[m]CSNEA(P)3876.7[m]CSNEA(P)3877.8[m]CSNEA(P)3880.8[m]CSNEA(P)3881.4[m]CSNEA(P)3882.8[m]CSNEA(P)3885.8[m]CSNEA(P)3888.4[m]CSNEA(P)3889.8[m]CSNEA(P)3892.6[m]CSNEA(P)3892.7[m]CSNEA(P)3894.3[m]CSNEA(P)3894.7[m]CSNEA(P)3895.3[m]CSNEA(P)3897.0[m]DCSNEA(P)3898.0[m]DCSNEA(P)3901.6[m]CSNEA(P)3905.0[m]DCSNEA(P)3920.0[m]DCSNEA(P)3935.0[m]DCSNEA(P)3940.0[m]DCSNEA(P)3950.0[m]DCSNEA(P)3970.0[m]DCSNEA(P)3990.0[m]DCSNEA(P)4010.0[m]DCSNEA(P)4030.0[m]DCSNEA(P)4061.0[m]DCSNEA(P)4063.0[m]DCSNEA(P)4065.0[m]DCSNEA(P)4067.0[m]DCSNEA(P)4121.0[m]DCSNEA(P)4126.0[m]DCSNEA(P)4128.0[m]DCSNEA(P)4130.0[m]CSNEA(P)4131.5[m]CSNEA(P)4133.0[m]CSNEA(P) -
Oljeprøver i Sokkeldirektoratet
Oljeprøver i Sokkeldirektoratet Test typeFlaske nummerTopp dyp
MD [m]Bunn dyp
MD [m]Væske typeTest tidspunktPrøver tilgjengeligDSTDST13802.003819.0014.08.1991 - 00:00YES -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet1362259761192120312721362212121212136216922002611275927592903333533813485353235323545356335713571361937163716387439404129 -
Spleisede logger
Spleisede logger Dokument navnDokument formatDokumentstørrelse [MB]pdf0.53 -
Geokjemisk informasjon
Geokjemisk informasjon Dokument navnDokument formatDokumentstørrelse [MB]pdf5.25 -
Dokumenter – eldre Sokkeldirektoratets WDSS rapporter og andre relaterte dokumenter
Dokumenter – eldre Sokkeldirektoratets WDSS rapporter og andre relaterte dokumenter Dokument navnDokument formatDokumentstørrelse [MB]pdf0.67pdf0.23 -
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk)
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk) Dokument navnDokument formatDokumentstørrelse [MB]pdf4.69pdf102.09 -
Borestrengtester (DST)
Borestrengtester (DST) Test nummerFra dybde MD
[m]Til dybde MD
[m]Reduksjonsventil størrelse
[mm]1.03802381920.6Borestrengtester (DST) Test nummerEndelig avstengningstrykk
[MPa]Endelig strømningstrykk
[MPa]Bunnhullstrykk
[MPa]Borehullstemperatur
[°C]1.0126Borestrengtester (DST) Test nummerOlje produksjon
[Sm3/dag]Gass produksjon
[Sm3/dag]Oljetetthet
[g/cm3]Gasstyngde rel. luftGOR
[m3/m3]1.06884617000.8100.720671 -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]CAL1303430DIF AC GR40214140DIF AC GR CBL27064002DIFL AC ZDEN GR19102499DIFL AC ZDL GR24933591DIL SLS GR LDT CNL37004170DIP12072499DIP35953970DIP GR35813591DL GR40214170DLL MLL SL35784022FMT22052225FMT37363838MCL1503490MFC35853590MWD RWD1984022SBT GR CCL34304021SWC20372462VSP18004021ZDL CN GR35783878 -
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 formasjonstestCONDUCTOR30197.036200.00.00LOTINTERM.201207.0261210.01.75LOTINTERM.13 3/82493.017 1/22495.01.84LOTINTERM.9 5/83578.012 1/43580.01.98LOTLINER74021.08 1/24170.02.15LOT -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling3131.057.016.0WATER BASED22.04.19917171.088.022.0WATER BASED23.04.19919731.089.023.0WATER BASED24.04.199112151.099.019.0WATER BASED25.04.199112151.088.014.0WATER BASED26.04.199112151.097.020.0WATER BASED29.04.199112201.087.017.0WATER BASED29.04.199112201.09WATER BASED29.04.199112201.09WATER BASED30.04.199112201.09WATER BASED02.05.199112201.09WATER BASED03.05.199112201.09WATER BASED06.05.199112401.2520.014.0WATER BASED06.05.199112401.2525.036.0WATER BASED07.05.199115031.2521.032.0WATER BASED06.05.199120001.2528.018.0WATER BASED08.05.199120661.3029.019.0WATER BASED10.05.199123031.3031.019.0WATER BASED10.05.199124331.3030.019.5WATER BASED13.05.199124331.3029.016.0WATER BASED13.05.199124331.3029.016.0WATER BASED13.05.199124331.3526.014.5WATER BASED15.05.199124331.3825.012.5WATER BASED16.05.199124331.3824.014.0WATER BASED21.05.199124331.3822.014.5WATER BASED21.05.199124331.3823.029.0WATER BASED21.05.199124331.3825.015.0WATER BASED21.05.199124331.3826.015.5WATER BASED21.05.199124331.3522.017.0WATER BASED14.05.199124461.3823.014.5WATER BASED22.05.199125031.3821.014.0WATER BASED23.05.199125031.3824.012.0WATER BASED27.05.199125031.3823.011.5WATER BASED27.05.199125031.3823.011.5WATER BASED28.05.199125031.3823.012.0WATER BASED24.05.199125031.3823.024.0WATER BASED27.05.199125351.3629.015.0WATER BASED29.05.199126091.3633.013.0WATER BASED30.05.199126951.3628.033.0WATER BASED03.06.199126951.3625.017.5WATER BASED31.05.199127121.3626.031.0WATER BASED03.06.199127381.3624.013.5WATER BASED03.06.199127611.3626.012.0WATER BASED04.06.199127611.3626.012.0WATER BASED05.06.199127771.4228.014.0WATER BASED07.06.199127881.4228.014.0WATER BASED07.06.199128201.4231.028.0WATER BASED10.06.199128711.4231.013.5WATER BASED10.06.199130801.4232.025.0WATER BASED12.06.199131841.4232.013.5WATER BASED13.06.199133761.4228.010.0WATER BASED14.06.199134141.4222.019.0WATER BASED19.06.199134291.7545.012.0WATER BASED29.07.199134701.4224.020.0WATER BASED19.06.199135911.5628.017.0WATER BASED19.06.199135911.5627.017.0WATER BASED19.06.199135911.5625.05.7WATER BASED20.06.199135911.5625.07.5WATER BASED21.06.199135911.5727.010.5WATER BASED25.06.199135911.5727.08.1WATER BASED25.06.199135911.5630.022.0WATER BASED19.06.199135911.5621.07.5WATER BASED25.06.199135911.7523.08.6WATER BASED26.06.199136081.7523.09.6WATER BASED26.06.199136501.7531.010.1WATER BASED27.06.199137001.7531.012.0WATER BASED28.06.199137121.7528.010.5WATER BASED01.07.199137121.7525.09.6WATER BASED01.07.199137331.7528.09.6WATER BASED01.07.199137461.7529.09.6WATER BASED02.07.199137741.7528.09.5WATER BASED03.07.199137821.7529.010.5WATER BASED04.07.199138171.7532.010.5WATER BASED05.07.199138191.7531.09.6WATER BASED09.07.199138541.7532.010.5WATER BASED09.07.199138861.7535.012.0WATER BASED09.07.199139021.7532.010.1WATER BASED09.07.199139301.7534.09.1WATER BASED12.08.199139301.7534.09.6WATER BASED13.08.199139721.7540.08.6WATER BASED23.07.199139761.7540.012.0WATER BASED24.07.199139861.7539.010.5WATER BASED25.07.199139991.7534.012.4WATER BASED10.07.199140211.7545.010.5WATER BASED29.07.199140221.7543.012.0WATER BASED26.07.199140221.7543.012.0WATER BASED29.07.199140221.7530.011.0WATER BASED11.07.199140221.7528.09.6WATER BASED15.07.199140221.7543.010.5WATER BASED30.07.199140221.7530.010.1WATER BASED15.07.199140221.7527.09.6WATER BASED15.07.199140221.7531.09.6WATER BASED15.07.199140221.7528.07.7WATER BASED16.07.199140221.7531.09.1WATER BASED17.07.199140221.7527.07.2WATER BASED18.07.199140221.7524.05.7WATER BASED19.07.199140221.7525.06.2WATER BASED22.07.199140221.7535.06.7WATER BASED22.07.199140221.7540.09.6WATER BASED22.07.199140391.7543.010.5WATER BASED31.07.199140391.7540.09.6WATER BASED05.08.199140621.7544.09.6WATER BASED01.08.199140721.7544.011.0WATER BASED02.08.199141121.7541.010.1WATER BASED05.08.199141311.7540.010.5WATER BASED05.08.199141471.7538.08.6WATER BASED06.08.199141701.7538.09.6WATER BASED07.08.199141701.7542.09.1WATER BASED09.08.199141701.7541.08.6WATER BASED12.08.199141701.7541.08.6WATER BASED12.08.199141701.7544.08.6WATER BASED14.08.199141701.7537.07.7WATER BASED15.08.199141701.7535.06.7WATER BASED19.08.199141701.7535.06.7WATER BASED19.08.199141701.7548.010.1WATER BASED20.08.199141701.7545.09.6WATER BASED21.08.199141701.7538.010.5WATER BASED22.08.199141700.00WATER BASED26.08.199141701.7538.08.6WATER BASED08.08.199141701.7535.07.2WATER BASED16.08.199141701.7534.07.7WATER BASED19.08.199141701.75WATER BASED23.08.1991 -
Tynnslip i Sokkeldirektoratet
Tynnslip i Sokkeldirektoratet DybdeEnhet3718.50[m ]3724.80[m ]3734.50[m ]3745.45[m ]3752.65[m ]3755.29[m ]3771.76[m ]3774.72[m ]3782.79[m ]3794.70[m ]3798.40[m ]3818.51[m ]3824.77[m ]3828.25[m ]3844.10[m ]3849.20[m ]3854.55[m ]3869.97[m ]3902.00[m ]3879.55[m ] -
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