31/6-3
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Generell informasjon
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Brønnhistorie
GeneralThe primary objective of the wildcat 31/6-3 was to assess possible hydrocarbon accumulations in the sands and sandstones of the Late Jurassic Sognefjord Formation. The target was prospect C, a structural trap in the southeastern corner of block 31/6 extending into the adjacent blocks 31/9, 32/4 and 32/7. The well was located on the apex of prospect C. The secondary objective of the well was to obtain Sedimentological data for the Sognefjord Formation sandstones in the well location. The well was planned to reach total depth at ca 2200 m, approximately 100 m into the Triassic.Operations and resultsThe well was spudded with the semi-submersible installation Nortrym on 1 November 1983. Repositioning of the rig had to be done due to anchoring problems. At 1950 m the drill string was hung off. Problems when attempting to retrieve the drill string resulted in pulling of BOP. When running in hole after 7 days, 10 m of fill was found. No other major problems occurred during drilling and the well reached planned TD at 2250 m in the Triassic Hegre Group. The well was drilled with seawater and hi-vis pills down to 618 m and with KCl/Polymer mud from 618 m to TD.The well encountered water-bearing sandstones in the Late/Middle Jurassic Sognefjord Formation as well as in the lower lying sandstones. No oil shows were noted on cores, sidewall cores or cuttings in any section of the well. Gas readings were low or nil throughout except for a 2.6% methane reading in a shallow sand unit at 414 m. The Sognefjord Formation sandstones (1511-1647 m) are very fine to fine, occasionally medium grained, micaceous, occasionally carbonaceous and slightly argillaceous. In places the sandstones grade into siltstones. They are well to moderately sorted and have fair visible porosity. The underlying Sognefjord, Fensfjord, and Krossfjord Formations (1647-1931.5m) are dominated by fine to medium, locally very fine or coarse grained sandstones which are often calcite cemented and have a fair visible porosity. Occasional interbeds of siltstone are also present together with some stringers of limestone, in the upper part yellow brown and very hard, becoming light grey and softer further down. The log evaluation gave a net sand thickness of 382,75 m out of a gross thickness of 420,5 m for the interval (1511 m to 1931.5 m) with an average porosity of 21.0% and an average water saturation of 96.1% (cut-off values used in the calculations were: 0<0,12, VSH>0,40). Eighteen FMT pressure test were performed over the interval 1513,5 m to 2146 m. From the pressure tests a water gradient of 0.1012 bar/m (1.033 g/cc) was calculated. A total of twelve cores were cut in the well. The cores recovered most of the Heather and Sognefjord Formations, and 25 m from the upper part of Fensfjord Formatio. No fluid samples were taken in the well.The well was permanently abandoned as a dry well on 26 December 1983.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]410.002250.00 -
Borekjerner i Sokkeldirektoratet
Borekjerner i Sokkeldirektoratet Kjerneprøve nummerKjerneprøve - topp dybdeKjerneprøve - bunn dybdeKjerneprøve dybde - enhet11495.01499.4[m ]21499.51509.0[m ]31509.01521.5[m ]41528.01528.6[m ]51533.51542.7[m ]61551.51565.4[m ]71565.51582.5[m ]81582.51601.3[m ]91601.51620.0[m ]101620.01638.5[m ]111638.51665.8[m ]121666.01694.1[m ]Borekjerner i Sokkeldirektoratet Total kjerneprøve lengde [m]178.3Borekjerner i Sokkeldirektoratet Kjerner tilgjengelig for prøvetaking?YES -
Kjernebilder
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Palynologiske preparater i Sokkeldirektoratet
Palynologiske preparater i Sokkeldirektoratet Prøve dybdeDybde enhetPrøve typeLaboratorie790.3[m]SWCIKU800.2[m]SWCIKU805.2[m]SWCIKU807.7[m]SWCIKU815.2[m]SWCIKU840.2[m]SWCIKU880.2[m]SWCIKU895.2[m]SWCIKU910.2[m]SWCIKU940.3[m]SWCIKU995.2[m]SWCIKU1005.0[m]SWCIKU1015.0[m]SWCIKU1035.0[m]SWCIKU1075.0[m]SWCIKU1110.0[m]SWCIKU1150.0[m]SWCIKU1220.0[m]SWCIKU1245.0[m]SWCIKU1255.0[m]SWCIKU1270.0[m]SWCIKU1290.0[m]SWCIKU1300.0[m]SWCIKU1302.0[m]DCRRI1310.0[m]SWCIKU1315.0[m]SWCIKU1332.0[m]SWCIKU1336.0[m]SWCIKU1363.7[m]SWCIKU1370.0[m]SWCIKU1370.0[m]DCRRI1375.0[m]SWCIKU1380.0[m]SWCIKU1390.0[m]SWCIKU1400.0[m]SWCIKU1400.0[m]DCRRI1410.0[m]SWCIKU1420.0[m]SWCIKU1430.0[m]SWCIKU1440.0[m]SWCIKU1440.0[m]DCRRI1452.0[m]SWCIKU1461.0[m]SWCIKU1470.0[m]SWCIKU1480.0[m]DCRRI1481.0[m]SWCIKU1490.0[m]SWCIKU1530.0[m]DCRRI1551.5[m]CRRI1622.0[m]DCRRI1700.0[m]SWCIKU1710.0[m]SWCIKU1720.0[m]SWCIKU1720.0[m]DCRRI1730.0[m]SWCIKU1750.0[m]SWCIKU1760.0[m]SWCIKU1800.0[m]DCRRI1810.0[m]SWCIKU1820.0[m]SWCIKU1830.0[m]SWCIKU1840.0[m]SWCIKU1880.0[m]SWCIKU1880.0[m]DCRRI1910.0[m]SWCIKU1930.0[m]SWCIKU1940.0[m]SWCIKU1950.0[m]SWCIKU1960.0[m]SWCIKU1963.0[m]DCRRI1970.0[m]SWCIKU1980.0[m]SWCIKU2010.0[m]SWCIKU2018.5[m]SWC2030.0[m]DCRRI2040.0[m]SWCIKU2040.0[m]SWC2060.0[m]SWCIKU2084.0[m]SWC2105.0[m]SWCIKU2117.0[m]SWC2130.0[m]DCRRI2131.5[m]SWC2140.0[m]SWCIKU2162.0[m]SWC2175.0[m]SWCIKU2180.0[m]SWC2220.0[m]DCRRI -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet326508508550702808808823998998105811301370137014951511166917561932197419742042212521432195 -
Spleisede logger
Spleisede logger Dokument navnDokument formatDokumentstørrelse [MB]pdf0.43 -
Geokjemisk informasjon
Geokjemisk informasjon Dokument navnDokument formatDokumentstørrelse [MB]pdf6.70pdf1.19pdf7.09 -
Dokumenter – eldre Sokkeldirektoratets WDSS rapporter og andre relaterte dokumenter
Dokumenter – eldre Sokkeldirektoratets WDSS rapporter og andre relaterte dokumenter Dokument navnDokument formatDokumentstørrelse [MB]pdf0.17pdf0.25 -
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk)
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk) Dokument navnDokument formatDokumentstørrelse [MB]pdf14.70 -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]CDL CNL GR CAL399616CDL CNL GR CAL6001362CDL CNL GR CAL13502247DIFL LS BHC SP GR399619DIFL LS BHC SP GR6001362DIFL LS BHC SP GR13602250FMT15132146GR326619HRD6001364HRD13602243MLL13602250SL13502247SWC6001364SWC13701800SWC18052230VSP7002240 -
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 formasjonstestCONDUCTOR30399.036400.00.00LOTSURF.COND.20600.026618.01.39LOTINTERM.13 3/81360.017 1/21365.01.82LOTOPEN HOLE2250.012 1/42250.00.00LOT -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling7001.2436.0water based10001.2441.0water based13001.2545.0water based14001.1339.0water based15101.2244.0water based17001.2244.0water based21001.2244.0water 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]pdf0.19