31/3-1
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Generell informasjon
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Brønnhistorie
GeneralThe wildcat 31/3-1 was drilled ca 17 km NNE of well 13/6-1 in the Troll East area. The two wells were drilled at the same time and together they established the existence of a Troll East gas field. The objective of 31/3-1 was to test possible gas and oil accumulations in sandstones of Late to Middle Jurassic age. Secondary objective was to test possible hydrocarbon accumulations in Middle to Early Jurassic and Late Triassic.Operations and resultsWildcat well 31/3-1 was spudded with the semi-submersible installation Deepsea Bergen on 17 July 1983 and drilled to TD at 2374 m in the Triassic Hegre Group. No significant problems occurred during drilling except some technical problems when running the BOP for the 26" section. The well was drilled with spud mud down to 865 m, with KCl/polymer from 865 m to 1300 m, with gel/lignosulphonate from 1300 m to 1833 m, and with lignite/lignosulphonate from 1833 m to TD.Top reservoir (Sognefjord Formation) was encountered at 1351.5 m. The Sognefjord, Heather, and Fensfjord Formations were found to hold a gas column of ca 220 m gas down to an approximate 4 m oil column. The OWC was at ca 1576m.Geochemical analyses of the reservoir gas show clear signs of biodegradation. Neither the Early Jurassic nor the Late Triassic contained hydrocarbons.Twelve cores were cut continuously from 1351 m to 1610 m in the Late and Middle Jurassic reservoir sequences. FMT fluid samples were taken at 1374.2 m, 1570 m, 1574.2 m, and 1579.2 m.The well was permanently abandoned on 13 October 1983 as a gas appraisal well.TestingTwo DST's were performed, and gas was produced from both. DST 1 was performed from the interval 1519 m to 1529 m and produced 842400 Sm3 gas /day on a 22 mm choke. The gas had a gravity of 0.635 (air = 1). DST2 was performed from the interval 1373 m to 1383 m and produced 733500 Sm3 gas /day on a 19 mm choke. The gas had a gravity of 0.635 (air = 1). Turbulence was a problem during the tests. Although stable static bottom hole temperatures were not obtained the data indicated a reservoir temperature of 54.8 deg C at 1353 m. With a seafloor temperature of 4 deg C this correspond to a linear temperature gradient of 51 deg C/km from top reservoir to the sea floor. -
Borekaks i Sokkeldirektoratet
Borekaks i Sokkeldirektoratet Borekaks tilgjengelig for prøvetaking?YESBorekaks i Sokkeldirektoratet Borekaksprøve, topp dybde [m]Borekaksprøve, bunn dybde [m]430.002374.00 -
Borekjerner i Sokkeldirektoratet
Borekjerner i Sokkeldirektoratet Kjerneprøve nummerKjerneprøve - topp dybdeKjerneprøve - bunn dybdeKjerneprøve dybde - enhet11351.01362.3[m ]21366.01371.5[m ]31372.01390.7[m ]41391.01405.2[m ]51407.01424.0[m ]61424.31442.3[m ]71442.61461.3[m ]81461.01480.0[m ]91480.01498.0[m ]101498.11516.8[m ]111516.01535.4[m ]121535.41553.6[m ]131553.91572.6[m ]141572.61578.6[m ]151591.31610.0[m ]Borekjerner i Sokkeldirektoratet Total kjerneprøve lengde [m]240.0Borekjerner i Sokkeldirektoratet Kjerner tilgjengelig for prøvetaking?YES -
Kjernebilder
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Palynologiske preparater i Sokkeldirektoratet
Palynologiske preparater i Sokkeldirektoratet Prøve dybdeDybde enhetPrøve typeLaboratorie610.0[m]DCGEOCH640.0[m]DCGEOCH670.0[m]DCGEOCH700.0[m]DCGEOCH730.0[m]DCGEOCH760.0[m]DCGEOCH790.0[m]DCGEOCH820.0[m]DCGEOCH850.0[m]DCGEOCH880.0[m]DCGEOCH909.0[m]DCGEOCH930.0[m]SWCIKU936.0[m]DCGEOCH963.0[m]DCGEOCH990.0[m]DCGEOCH1017.0[m]DCGEOCH1026.0[m]SWCIKU1038.0[m]SWCIKU1044.0[m]DCGEOCH1071.0[m]DCGEOCH1098.0[m]DCGEOCH1100.0[m]SWCIKU1125.0[m]DCGEOCH1152.0[m]DCGEOCH1157.0[m]SWCIKU1179.0[m]DCGEOCH1206.0[m]DCGEOCH1219.0[m]SWCIKU1224.0[m]DCGEOCH1229.0[m]SWCIKU1233.0[m]DCGEOCH1251.0[m]DCGEOCH1282.0[m]SWCIKU1290.0[m]SWCIKU1312.0[m]SWCIKU1317.0[m]SWCIKU1322.0[m]SWCIKU1342.0[m]SWCIKU1612.0[m]SWCIKU1780.0[m]SWCIKU1825.0[m]SWCIKU1845.0[m]SWCIKU1865.0[m]SWCIKU1900.0[m]SWCIKU1920.0[m]SWCIKU1980.0[m]DCIKU2040.0[m]SWCIKU -
Oljeprøver i Sokkeldirektoratet
Oljeprøver i Sokkeldirektoratet Test typeFlaske nummerTopp dyp
MD [m]Bunn dyp
MD [m]Væske typeTest tidspunktPrøver tilgjengeligDSTTEST11519.001529.00OIL22.09.1983 - 14:50YESDSTTEST21373.001383.0004.10.1983 - 15:30YES -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet3575319319311038113612251235127312731320132013521497151616681779179618441844194519922001208821052160 -
Spleisede logger
Spleisede logger Dokument navnDokument formatDokumentstørrelse [MB]pdf0.50 -
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]pdf0.19pdf0.25 -
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk)
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk) Dokument navnDokument formatDokumentstørrelse [MB]PDF30.93pdf5.87pdf2.89pdf0.64pdf0.45pdf0.35pdf7.92pdf7.34pdf4.45pdf0.44pdf0.78pdf0.35pdf12.58pdf0.30pdf0.21pdf1.83pdf3.80pdf2.09pdf0.90pdf0.16pdf3.15pdf1.27pdf0.16pdf0.14pdf4.47pdf5.56pdf0.17pdf0.03pdf0.03pdf0.02pdf0.02pdf3.04pdf2.46pdf1.33pdf0.39pdf0.37pdf0.17pdf0.06pdf0.03pdf0.02pdf0.03pdf0.04pdf0.03pdf0.02pdf4.52pdf3.80pdf0.37pdf0.61pdf1.09pdf40.84pdf1.42pdf0.41pdf2.21pdf0.13pdf1.27pdf2.18pdf0.92pdf1.87pdf1.25pdf4.46pdf9.10pdf2.28pdf6.00pdf0.67pdf0.55pdf0.21pdf2.63pdf0.46pdf5.40pdf1.27 -
Borestrengtester (DST)
Borestrengtester (DST) Test nummerFra dybde MD
[m]Til dybde MD
[m]Reduksjonsventil størrelse
[mm]1.01519152916.92.01373138312.7Borestrengtester (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]1.03550002.0479000 -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]4ARM DIP/STRATDIP12882374ACBL3551285ACBL10001814CDL CNL GR CAL12852372CDL GR CAL8451299DIFL BHC AC350866DIFL BHC AC GR SP CAL8452374DLL MLL GR12851835FMT13521695PROLOG13401650VELOCITY11102375 -
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 formasjonstestCONDUCTOR30421.036422.00.00LOTSURF.COND.20849.026865.01.55LOTINTERM.13 3/81285.517 1/21300.01.66LOTINTERM.9 5/81815.512 1/41835.01.65LOTOPEN HOLE2374.08 1/22374.00.00LOT -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling4501.0751.0seawater10001.0853.0seawater12601.2822.0seawater17751.3060.0seawater19501.1253.0seawater -
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]pdf0.20