7/8-3
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Generell informasjon
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Brønnhistorie
GeneralWell 7/8-3 is located in the North Sea, north of the Mime field on the margin of the Cod Terrace. The primary objective of 7/8-3 was to explore the hydrocarbon potential of the Late Jurassic sandstones. Secondary objectives were to explore the Cretaceous Chalk and the Triassic sandstones. Planned TD was at 4275 m in Permian salt.Operations and resultsWildcat well 7/8-3 was spudded with the semi-submersible installation Borgny Dolphin on 12 September 1983 and drilled to TD at 4320 m in the Late Permian Zechstein Group. While running 13 3/8" casing this got stuck and had to be pulled out of the hole. The hole was cleaned and new casing was set without further complications. Otherwise no significant problems were encountered during drilling. The well was drilled with spud mud down to 199 m and with KCl polymer mud from 199 m to TD.The Cretaceous Chalk was encountered at a depth of 3024 m, the Late Jurassic Ula Formation at 3724 m, and the Triassic at 3767 m. The Ula Formation sandstones were hydrocarbon bearing within a 43.5 m gross sand interval. No oil/water contact was encountered. Oil shows were recorded in shales and porous sections from 3699 m to 3751 m.Four cores were cut in the interval 3731 m to 3773 m, three in the Upper Jurassic Ula Formation and one into Upper Triassic sandstones. A RFT fluid sample from the Triassic section at 4049.5 m recovered only mud filtrate.The well was permanently abandoned on 12 December 1983 as an oil discovery.TestingTwo DST's were performed in the Ula Formation sandstones: DST 1 from interval 3762 m to 3767 m, and DST 2 from interval 3734.5 m to 3740.5 m. The first produced oil at a slightly declining rate during the final 5-hours flow period, the average rate being 207 Sm3/day through a 2" choke. The GOR was 32 Sm3/Sm3, API oil gravity was 29 deg, and gas gravity was 0.88 (air = 1). The second DST produced 70 Sm3 oil/day through a 2" choke. API oil gravity was 29 deg . Gas was also produced, but the rate was not obtainable. Reservoir temperatures based on the DST measurements were 156 deg C in DST 1 and 154 deg C in DST 2. -
Borekaks i Sokkeldirektoratet
Borekaks i Sokkeldirektoratet Borekaks tilgjengelig for prøvetaking?YESBorekaks i Sokkeldirektoratet Borekaksprøve, topp dybde [m]Borekaksprøve, bunn dybde [m]210.004321.00 -
Borekjerner i Sokkeldirektoratet
Borekjerner i Sokkeldirektoratet Kjerneprøve nummerKjerneprøve - topp dybdeKjerneprøve - bunn dybdeKjerneprøve dybde - enhet13731.03739.5[m ]23739.83741.5[m ]33741.73760.1[m ]43760.13768.2[m ]Borekjerner i Sokkeldirektoratet Total kjerneprøve lengde [m]36.7Borekjerner i Sokkeldirektoratet Kjerner tilgjengelig for prøvetaking?YES -
Kjernebilder
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Palynologiske preparater i Sokkeldirektoratet
Palynologiske preparater i Sokkeldirektoratet Prøve dybdeDybde enhetPrøve typeLaboratorie3586.0[m]DC3592.0[m]DC3601.0[m]DC3610.0[m]DC3619.0[m]DC3628.0[m]DC3637.0[m]DC3640.0[m]DC3649.0[m]DC3658.0[m]DC3667.0[m]DC3676.0[m]DC3685.0[m]DC3691.0[m]DCHALIB3694.0[m]DC3703.0[m]DC3706.0[m]DCHALIB3721.0[m]DCHALIB3730.0[m]DCPETROSTR3731.0[m]DCHALIB3735.1[m]CPETROSTR3736.2[m]CHALIB3738.4[m]CPETROSTR3742.2[m]CPETROS3745.3[m]CHALIB3746.9[m]CPETROSTR3748.0[m]CHALIB3750.9[m]CPETROSTR3753.6[m]CHALIB3754.8[m]CPETROSTR3758.3[m]CHALIB3758.9[m]CPETROSTR3760.0[m]DCPETROS3767.0[m]DCPETROS3775.0[m]DCPETROS3817.0[m]DCSAGA3829.0[m]DCSAGA3841.0[m]DCSAGA3856.0[m]DCSAGA3868.0[m]DCSAGA3880.0[m]DCSAGA3892.0[m]DCSAGA3904.0[m]DCSAGA3916.0[m]DCSAGA3931.0[m]DCSAGA3943.0[m]DCSAGA3955.0[m]DCSAGA3967.0[m]DCSAGA3979.0[m]DCSAGA3991.0[m]DCSAGA4003.0[m]DCSAGA4024.0[m]DCSAGA4042.0[m]DCSAGA4069.0[m]DCSAGA4099.0[m]DCSAGA4126.0[m]DCSAGA4153.0[m]DCSAGA4180.0[m]DCSAGA4210.0[m]DCSAGA4237.0[m]DCSAGA4243.0[m]DCSAGA4255.0[m]DCSAGA4267.0[m]DCSAGA4276.0[m]DCSAGA4291.0[m]DCSAGA4306.0[m]DCSAGA4315.0[m]DCSAGA4321.0[m]DCSAGA -
Oljeprøver i Sokkeldirektoratet
Oljeprøver i Sokkeldirektoratet Test typeFlaske nummerTopp dyp
MD [m]Bunn dyp
MD [m]Væske typeTest tidspunktPrøver tilgjengeligDSTDST13762.003767.0002.12.1983 - 00:00YESDSTDST23734.503740.5005.12.1983 - 00:00YES -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet1061334271727172753277828312858285830243275336133673393339336393639367537243724376737674237 -
Spleisede logger
Spleisede logger Dokument navnDokument formatDokumentstørrelse [MB]pdf0.91 -
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]pdf0.18pdf0.36 -
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk)
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk) Dokument navnDokument formatDokumentstørrelse [MB]pdf9.77pdf7.95pdf1.97pdf1.42pdf0.45pdf0.42pdf3.64pdf0.25pdf2.47pdf0.68pdf0.55pdf0.72pdf2.66 -
Borestrengtester (DST)
Borestrengtester (DST) Test nummerFra dybde MD
[m]Til dybde MD
[m]Reduksjonsventil størrelse
[mm]1.03762376750.02.03734374150.0Borestrengtester (DST) Test nummerEndelig avstengningstrykk
[MPa]Endelig strømningstrykk
[MPa]Bunnhullstrykk
[MPa]Borehullstemperatur
[°C]1.02.0Borestrengtester (DST) Test nummerOlje produksjon
[Sm3/dag]Gass produksjon
[Sm3/dag]Oljetetthet
[g/cm3]Gasstyngde rel. luftGOR
[m3/m3]1.02070.8820.880322.0700.882 -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]CBL VDL GR33503801CST25173550CST36394236CYBERLOOK37004240DLL GR35584257DLWD6453719DUALDIP20004262ILD LSS GR19844261ISF LSS MSFL GR1994261LDL CNL GR6103566LDL CNL NGL GR35584262RFT37244170SHDT ARROW19754250SHDT CYBERDIP35584262SHDT GEO19844262SHDT GR19844262TEMPERATURE109980WST2054250 -
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 formasjonstestCONDUCTOR30199.036199.00.00LOTSURF.COND.20610.026622.01.88LOTINTERM.13 3/81981.017 1/21995.01.65LOTINTERM.9 5/83554.012 1/43561.02.03LOTLINER73827.08 1/24320.00.00LOT -
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