7121/7-2
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Generell informasjon
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Brønnhistorie
GeneralWell 7121/7-2 was drilled on the Beta structure on Tromsøflaket, 3.4 km south of well 7121/7-1. It was designed to test the hydrocarbon potential in Middle to Lower Jurassic sandstones. Planned total depth was in rocks of Triassic age.Operations and resultsWildcat well 7121/7-2 was spudded with the semi-submersible installation Ross Isle on 7 July 1986 and drilled to TD at 2156 m in the Late Triassic Fruholmen Formation. At 871 m in the 17 1/2" section the string parted and 9.5 hours was spent fishing to retrieve the lost equipment. At 1698 m, TD in the 17 1/2" section a H2S alarm occurred with 28 ppm H2S in the mud gas. The problem was cured by placing spud mud with a concentration of 15 kg/m3 of ZnCO3 behind 13-3/8" casing to prevent H2S growing in mud. The well was drilled with spud mud down to 667 m and with polymer/"Shale-Trol" mud from 667 m to TD. The well acted as a pilot well for testing this mud on Tromsøflaket. The main reason for using this mud system was that it was expected to stable the hole through sections that from previous experience had proven to cause tight-hole problems. The mud performed better than the ordinary gypsum/polymer mud previously used in the area, but total costs were higher and it was thus not considered a success.Hydrocarbon bearing Middle Jurassic sandstones (Stø Formation) were encountered at 1881.5 m. The gas/water contact in this well was recognized at 1914.4 m, ca 12 m deeper than in the 7120/9-1 Albatross Discovery. The gas zone, 1881.5 m to 1914.4 m, consists of an interbedded silt, shale and very fine sandstone sequence with good reservoir properties. Two cores were cut in the Stø Formation over the interval 1903 m to 1939 m, (1889 m to 1935 m, loggers depth). Three FMT samples were collected, one at 1884.5 m and two at 1899 m.The well was permanently abandoned as a gas discovery on 12 August 1986.TestingThe interval 1881.8 m to 1889.9 m was perforated and production tested. The test produced on average 527000 Sm3 gas and 28 Sm3 condensate pr day through a 15. 8 mm choke during the main flow. This gives a GOR of ca 18800 Sm3/Sm3. The CO2 content was 8 %. No H2S was detected. -
Borekaks i Sokkeldirektoratet
Borekaks i Sokkeldirektoratet Borekaks tilgjengelig for prøvetaking?YESBorekaks i Sokkeldirektoratet Borekaksprøve, topp dybde [m]Borekaksprøve, bunn dybde [m]430.002160.00 -
Borekjerner i Sokkeldirektoratet
Borekjerner i Sokkeldirektoratet Kjerneprøve nummerKjerneprøve - topp dybdeKjerneprøve - bunn dybdeKjerneprøve dybde - enhet11903.01927.2[m ]21928.51939.5[m ]Borekjerner i Sokkeldirektoratet Total kjerneprøve lengde [m]35.2Borekjerner i Sokkeldirektoratet Kjerner tilgjengelig for prøvetaking?YES -
Kjernebilder
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Palynologiske preparater i Sokkeldirektoratet
Palynologiske preparater i Sokkeldirektoratet Prøve dybdeDybde enhetPrøve typeLaboratorie909.0[m]SWCGEAR925.0[m]SWCGEAR926.5[m]SWCGEAR1007.0[m]SWCGEAR1034.0[m]SWCGEAR1091.0[m]SWCGEAR1149.2[m]SWCGEAR1176.0[m]SWCGEAR1291.0[m]SWCGEAR1349.5[m]SWCGEAR1379.5[m]SWCGEAR1405.0[m]SWCGEAR1433.0[m]SWCGEAR1461.0[m]SWCGEAR1519.0[m]SWCGEAR1550.0[m]SWCGEAR1556.0[m]SWCGEAR1615.9[m]SWCGEAR1722.5[m]SWCGEAR1729.0[m]SWCGEAR1732.0[m]SWCGEAR1807.0[m]SWCGEAR1812.0[m]SWCGEAR1817.0[m]SWCGEAR1824.0[m]SWCGEAR1831.0[m]SWCGEAR1841.0[m]SWCGEAR1848.0[m]SWCGEAR1858.0[m]SWCGEAR1862.0[m]SWCGEAR1868.0[m]SWCGEAR1877.0[m]SWCGEAR1895.8[m]SWCGEAR1911.0[m]SWCGEAR1914.2[m]SWCGEAR1915.6[m]SWCGEAR1918.8[m]SWCGEAR1921.5[m]SWCGEAR1924.6[m]SWCGEAR1929.3[m]SWCGEAR1932.7[m]SWCGEAR1934.4[m]SWCGEAR1991.0[m]SWCGEAR1999.0[m]SWCGEAR2048.0[m]SWCGEAR2062.0[m]SWCGEAR2087.0[m]SWCGEAR2110.5[m]SWCGEAR2114.0[m]SWCGEAR2119.0[m]SWCGEAR2124.0[m]SWCGEAR2143.0[m]SWCGEAR2149.0[m]SWCGEAR -
Oljeprøver i Sokkeldirektoratet
Oljeprøver i Sokkeldirektoratet Test typeFlaske nummerTopp dyp
MD [m]Bunn dyp
MD [m]Væske typeTest tidspunktPrøver tilgjengeligDSTDST12180.002153.0007.08.1986 - 00:00YESFMT0.001899.0001.08.1986 - 00:00YESMDT0.000.00YES -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet347430430889889923923157817281806188018821882193820282073 -
Spleisede logger
Spleisede logger Dokument navnDokument formatDokumentstørrelse [MB]pdf0.18 -
Geokjemisk informasjon
Geokjemisk informasjon Dokument navnDokument formatDokumentstørrelse [MB]pdf0.26 -
Dokumenter – eldre Sokkeldirektoratets WDSS rapporter og andre relaterte dokumenter
Dokumenter – eldre Sokkeldirektoratets WDSS rapporter og andre relaterte dokumenter Dokument navnDokument formatDokumentstørrelse [MB]pdf0.24pdf0.19 -
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk)
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk) Dokument navnDokument formatDokumentstørrelse [MB]pdf17.56 -
Borestrengtester (DST)
Borestrengtester (DST) Test nummerFra dybde MD
[m]Til dybde MD
[m]Reduksjonsventil størrelse
[mm]1.01882189915.9Borestrengtester (DST) Test nummerEndelig avstengningstrykk
[MPa]Endelig strømningstrykk
[MPa]Bunnhullstrykk
[MPa]Borehullstemperatur
[°C]1.014.000Borestrengtester (DST) Test nummerOlje produksjon
[Sm3/dag]Gass produksjon
[Sm3/dag]Oljetetthet
[g/cm3]Gasstyngde rel. luftGOR
[m3/m3]1.0285270000.7750.78018800 -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]ACBL VDL3451677ACBL VDL12641400ACBL VDL16711925CDL DNL GR CAL16772154COREGUN8751615COREGUN17122150DIFL BHC AC CDL GR SP CAL6541628DIFL BHC AC GR SP CAL345675DIFL BHC AC GR SP CAL16002155DLL MLL GR18702004FMT18822068FMT18991899FMT18991899HR DIP16772154MWD - GR RES428674RLL - GR RES16802028VSP4052140 -
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 formasjonstestCONDUCTOR30422.036426.00.00LOTSURF.COND.20654.026675.01.74LOTINTERM.13 3/81680.017 1/21698.01.53LOTINTERM.9 5/82156.012 1/42156.00.00LOT -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling4251.08WATER BASED6781.101100.0WATER BASED7951.111500.0WATER BASED12961.1421.0WATER BASED16801.202000.0WATER BASED18501.261500.0WATER BASED19391.251800.0WATER BASED21141.261800.0WATER BASED21561.251800.0WATER 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]pdf0.25