7/8-4
Eksport: PDF
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Generell informasjon
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Brønnhistorie
GeneralWildcat well 7/8-4 was drilled on the northern flank of the Central Graben. The prospect was a structural/stratigraphic trap situated on the north flank of a high standing Triassic fault block. The objective was to test the hydrocarbon potential of a prognosed Late Jurassic sand body at 3840 m. Isolated sands within the Triassic were also postulated as hydrocarbon traps and potential secondary targets.Operations and resultsWell 7/8-4 was spudded with the semi-submersible installation Nortrym on 11 December 1984 and drilled to TD at 4400 m in Early Triassic sandstones and shales of the Smith Bank Formation. The overall operation took 72 days from spud. Problems with gumbo and keeping the hole clean were experienced. A weighted KCl polymer mud was used to keep the hole open and prevent shale spalling. From 4192 m onwards, problems of tight hole was experienced with the drill string becoming permanently stuck at 4400 m. Differential sticking was thought to be the problems, so the mud weight was reduced to compensate for this. While attempting to free the pipe the well started to flow but this was quickly stopped by raising the mud weight. While pulling out of the hole the drill pipe got stuck with the bit at 4382 m. The pipe was unscrewed at 4250 m and during fishing operations two more sections of pipe were lost in the hole, one with the top at 4192 m, the other at 4183 m. The operator then decided on a sidetrack, and the hole was cemented back to 4130 m and a sidetrack was kicked off from 4140 m. Eleven days were lost due to the plug back and sidetrack operation. The well was drilled with seawater down to 619 m and with KCl polymer mud from 619 m to TD.Two cores were cut from 3825.5 m to 3859 m in what was believed to be the Ula sandstone of the Late Jurassic, the primary objective. Subsequent analysis revealed the Lower Cretaceous to unconformably overlie Middle Triassic formations with no Jurassic rocks present at this location. Hence, the cored section was in the upper Smith Bank Formation. No hydrocarbon indications were registered in the well. No pressure or fluid samples were taken on wire line.The well was permanently abandoned on 20 February 1985 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]200.004397.00 -
Borekjerner i Sokkeldirektoratet
Borekjerner i Sokkeldirektoratet Kjerneprøve nummerKjerneprøve - topp dybdeKjerneprøve - bunn dybdeKjerneprøve dybde - enhet13825.03831.3[m ]23831.53859.0[m ]Borekjerner i Sokkeldirektoratet Total kjerneprøve lengde [m]33.8Borekjerner i Sokkeldirektoratet Kjerner tilgjengelig for prøvetaking?YES -
Kjernebilder
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Palynologiske preparater i Sokkeldirektoratet
Palynologiske preparater i Sokkeldirektoratet Prøve dybdeDybde enhetPrøve typeLaboratorie3701.0[m]DCOD3710.0[m]DCOD3719.0[m]DCOD3728.0[m]DCOD3740.0[m]DCOD3749.0[m]DCOD3758.0[m]DCOD3770.0[m]DCOD3806.0[m]DCOD3809.0[m]DCOD3812.0[m]DCOD3815.0[m]DCOD3818.0[m]DCOD3821.0[m]DCOD3827.0[m]COD3828.1[m]COD3829.5[m]COD3830.1[m]COD3832.4[m]COD3854.9[m]COD -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet107145029552955298930403099312531253187352936293705372837283817381738263826 -
Spleisede logger
Spleisede logger Dokument navnDokument formatDokumentstørrelse [MB]pdf0.98 -
Geokjemisk informasjon
Geokjemisk informasjon Dokument navnDokument formatDokumentstørrelse [MB]pdf1.88 -
Dokumenter – eldre Sokkeldirektoratets WDSS rapporter og andre relaterte dokumenter
Dokumenter – eldre Sokkeldirektoratets WDSS rapporter og andre relaterte dokumenter Dokument navnDokument formatDokumentstørrelse [MB]pdf0.29pdf0.32 -
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk)
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk) Dokument navnDokument formatDokumentstørrelse [MB]pdf7.74 -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]CST37994014ISF LSS GR MSFL SP203613ISF LSS GR MSFL SP LDT CNL GR6061957ISF LSS MSFL GR CAL LDT CNL GR C19463813ISF LSS MSFL LDT CNL SHDT GR37954405MWD GR RES DIR6494397TEMPERATURE1073694TEMPERATURE1071917VSP2504400 -
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 formasjonstestCONDUCTOR30204.036205.00.00LOTSURF.COND.20607.026619.01.67LOTINTERM.13 3/81946.017 1/21970.01.93LOTINTERM.9 5/83796.012 1/43808.02.23LOTOPEN HOLE4400.08 1/24400.00.00LOT -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling1751.07WATER BASED11.12.19842051.07WATER BASED12.12.19846191.13WATER BASED17.12.19846190.0017.0105.3WATER BASED15.12.19846191.0917.0105.3WATER BASED16.12.19848301.1920.0114.7WATER BASED19.12.19848301.1920.0114.7WATER BASED18.12.198412411.3925.0114.7WATER BASED20.12.198415341.5027.0100.5WATER BASED20.12.198416941.5030.095.8WATER BASED26.12.198419151.5032.0301.6WATER BASED26.12.198419631.5723.0110.1WATER BASED27.12.198419631.6127.095.8WATER BASED27.12.198419631.6127.095.8WATER BASED27.12.198419701.6023.095.8WATER BASED14.12.198421191.5428.081.4WATER BASED14.12.198421941.4830.086.2WATER BASED14.12.198422931.4830.095.8WATER BASED14.12.198423541.4834.0105.3WATER BASED14.12.198425921.4829.091.0WATER BASED15.12.198426421.4833.0105.3WATER BASED30.12.198429191.4824.095.8WATER BASED25.12.198429941.4822.0110.1WATER BASED25.12.198431051.4821.0100.5WATER BASED25.12.198431281.4726.0134.1WATER BASED02.01.198531961.4826.0110.1WATER BASED04.01.198532541.4824.0129.2WATER BASED07.01.198533421.4825.0110.1WATER BASED14.01.198534241.4822.0119.7WATER BASED14.01.198534381.4823.0100.0WATER BASED14.01.198534531.4822.0129.3WATER BASED14.01.198535591.4825.0119.7WATER BASED15.01.198535711.4427.0110.1WATER BASED16.01.198536171.5427.0119.7WATER BASED17.01.198536601.5427.0119.7WATER BASED17.01.198536841.5425.0124.5WATER BASED21.01.198537831.7153.081.0WATER BASED16.02.198538081.5436.0134.0WATER BASED24.01.198538261.7438.0143.6WATER BASED28.01.198538571.7433.0114.9WATER BASED28.01.198538591.7434.0124.5WATER BASED27.01.198539111.7426.0148.4WATER BASED29.01.198539431.7438.0114.9WATER BASED30.01.198540921.74360.0110.1WATER BASED31.01.198540921.7436.0110.1WATER BASED31.01.198540921.74360.0110.1WATER BASED31.01.198541301.7233.072.0WATER BASED10.02.198541401.7132.071.8WATER BASED11.02.198541921.7431.0100.5WATER BASED31.01.198541921.6930.0110.1WATER BASED31.01.198541921.7431.0100.5WATER BASED31.01.198541921.6930.0110.1WATER BASED31.01.198543471.6831.081.4WATER BASED31.01.198544001.6728.067.0WATER BASED02.02.198544001.6928.057.4WATER BASED06.02.198544001.7131.062.0WATER BASED07.02.198544001.6928.057.4WATER BASED06.02.198544001.6628.048.0WATER BASED05.02.198544001.7131.062.0WATER BASED07.02.198544001.7138.086.2WATER BASED16.02.198544001.6628.048.0WATER BASED05.02.1985