7120/7-2
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Generell informasjon
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Brønnhistorie
GeneralWell 7120/7-2 is located in the Snøhvit Field area. The primary of the well was to test possible hydrocarbon accumulations in sandstones of Middle to Early Jurassic age.Operations and resultsWildcat well 7120/7-2 was spudded with the semi-submersible rig West Vanguard on 26 May 1983 and drilled to TD at 2523 m, 5 meters into Late Triassic rocks. Due to boulders at the spud location the rig was moved 11 m north and respudded. A sand body with shallow gas was encountered at 378 m to 382.5 m and it was decided to set the 20" casing shoe above this sand. After setting this casing the rig was shut down due to strike from 3 June at 2400 hrs to 18 June at 1125 hrs. The well was drilled using gel mud down to 815 m, with gypsum/polymer mud from 815 m to 1515, and dispersed to a lignosulphonate (Unical) mud from 1515 m to TD.Hydrocarbon accumulations were discovered in the Middle Jurassic Stø Formation sandstone sequence from 2149.5 m down to a gas/water contact at 2228 m. Shows were recorded below 1809 m in the Cretaceous Kolje Formation. Organic geochemical analyses showed that TOC increases down through the Cretaceous, but generally the Cretaceous mudstones were regarded as immature, poor source rocks with a primary potential for gas. Entering into the silty shales and mudstones of the Late Jurassic Hekkingen Formation at 2107 m TOC increases abruptly above 3%. TOC continues to increase to 9 % at the base of the Hekkingen Formation. These shales are potentially very good source rocks for gas and condensate above ca 2120 metres and rich sources for light oil and gas below this depth. Maturity evaluation was difficult due to reworked material and cavings, but most likely the well is immature all through, possibly marginally mature below ca 2000 m. Five cores were cut in the sandstones from 2168 m to 2244 m. Four RFT samples were taken. Sample 1 was taken at 2150 m (gas, mud filtrate and film of condensate), sample 2 at 2151 m (gas, mud filtrate and condensate, sample 3 at 2225 m (mud filtrate and water), and sample 4 at 2220 m (mud filtrate and minor gas).The well was permanently abandoned on 21 August as a gas/condensate discovery.TestingOne DST was performed in the Stø Formation in the intervals 2168 m to 2179.8 m and 2153 m to 2164.8 m. The lower interval was intended for pressure monitoring to test possible communication between the two zones, but the pressure recordings failed. The test produced 702450 Sm3 gas and 31.5 Sm3 condensate /day on a 64/64 choke during the main flow. Condensate density was 0.77 g/cm3 and the gas gravity was 0.68 (air = 1) with a CO2 content of 5%. No H2S was recorded. This corresponds to a very dry gas condensate similar to the 7120/7 and 7120/8 hydrocarbon systems.> -
Borekaks i Sokkeldirektoratet
Borekaks i Sokkeldirektoratet Borekaks tilgjengelig for prøvetaking?YESBorekaks i Sokkeldirektoratet Borekaksprøve, topp dybde [m]Borekaksprøve, bunn dybde [m]330.002520.00 -
Borekjerner i Sokkeldirektoratet
Borekjerner i Sokkeldirektoratet Kjerneprøve nummerKjerneprøve - topp dybdeKjerneprøve - bunn dybdeKjerneprøve dybde - enhet12166.02184.0[m ]22184.02190.0[m ]32190.02208.0[m ]42208.02226.8[m ]52226.82244.4[m ]Borekjerner i Sokkeldirektoratet Total kjerneprøve lengde [m]78.4Borekjerner i Sokkeldirektoratet Kjerner tilgjengelig for prøvetaking?YES -
Kjernebilder
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Palynologiske preparater i Sokkeldirektoratet
Palynologiske preparater i Sokkeldirektoratet Prøve dybdeDybde enhetPrøve typeLaboratorie700.0[m]DCPAS760.0[m]DCPAS780.0[m]DCPAS800.0[m]DCPAS840.0[m]DCPAS890.0[m]DC930.0[m]DC950.0[m]DCOD960.0[m]DCOD970.0[m]DCOD980.0[m]DCOD990.0[m]DCPAS1000.0[m]DC1000.0[m]DCPAS1000.0[m]DCOD1023.0[m]SWCPAS1050.0[m]SWCPAS1060.0[m]DCPAS1100.0[m]SWCPAS1100.0[m]DC1126.5[m]SWCPAS1140.0[m]DCOD1150.0[m]DCOD1152.5[m]SWCPAS1160.0[m]DCOD1160.0[m]DCPAS1185.0[m]SWCPAS1200.0[m]DC1218.0[m]SWCPAS1227.3[m]DCPAS1239.0[m]DCOD1247.5[m]SWCPAS1251.0[m]DCOD1257.0[m]DCPAS1260.0[m]DCOD1269.0[m]DCOD1272.8[m]DCPAS1299.0[m]DC1302.0[m]DCPAS1317.0[m]DCPAS1340.0[m]SWCPAS1370.0[m]SWCPAS1380.0[m]DCPAS1400.0[m]SWCPAS1404.0[m]DC1423.0[m]SWCPAS1437.0[m]DCPAS1452.0[m]DCPAS1470.0[m]SWCPAS1490.0[m]SWCPAS1497.0[m]DCPAS1500.0[m]DC1512.0[m]DCPAS1525.0[m]SWCPAS1542.0[m]DCPAS1557.0[m]DCPAS1572.0[m]DCPAS1587.0[m]SWCPAS1599.0[m]DC1602.0[m]DCPAS1617.0[m]DCPAS1632.0[m]DCPAS1647.0[m]DCPAS1677.0[m]DCPAS1690.0[m]DCPAS1701.0[m]DCPAS1701.0[m]DC1720.0[m]SWCPAS1737.0[m]DCPAS1752.0[m]DCPAS1767.0[m]DCPAS1790.0[m]SWCPAS1797.0[m]DC1812.0[m]DCPAS1827.0[m]DCPAS1842.0[m]DCPAS1857.0[m]DCPAS1872.0[m]DCPAS1887.0[m]DCPAS1899.0[m]DC1900.0[m]SWCPAS1917.0[m]DCPAS1932.0[m]DCPAS1962.0[m]DCPAS1977.0[m]DCPAS1992.0[m]DCPAS2001.0[m]DC2007.0[m]DCPAS2020.0[m]SWCPAS2031.0[m]DCPAS2040.0[m]DC2046.0[m]DCPAS2061.0[m]DCPAS2076.0[m]DCPAS2091.0[m]DCPAS2100.0[m]DC2107.0[m]SWCPAS2115.0[m]DCPAS2139.0[m]SWCPAS2139.0[m]DC2141.5[m]SWCPAS2147.0[m]SWCPAS2151.0[m]DC2166.0[m]DCPAS2181.0[m]CPAS2183.6[m]CPAS2184.5[m]CPAS2193.6[m]CPAS2202.7[m]CPAS2274.0[m]SWCPAS2292.0[m]DCPAS2306.5[m]SWCPAS2322.0[m]DCPAS2337.0[m]DCPAS2352.0[m]DCPAS2367.0[m]DCPAS2397.0[m]DCPAS2412.0[m]DCPAS2442.0[m]DCPAS2457.0[m]DCPAS2477.0[m]SWCPAS2492.0[m]DCPAS2502.0[m]DCPAS2517.0[m]DCPAS2520.0[m]DCPAS -
Oljeprøver i Sokkeldirektoratet
Oljeprøver i Sokkeldirektoratet Test typeFlaske nummerTopp dyp
MD [m]Bunn dyp
MD [m]Væske typeTest tidspunktPrøver tilgjengeligDSTTEST12153.002180.0011.08.1983 - 18:55NO -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet26338038094794710921092166619872017214121502150225623872435 -
Spleisede logger
Spleisede logger Dokument navnDokument formatDokumentstørrelse [MB]pdf0.44 -
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]pdf0.17pdf0.26 -
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk)
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk) Dokument navnDokument formatDokumentstørrelse [MB]pdf18.92pdf1.29 -
Borestrengtester (DST)
Borestrengtester (DST) Test nummerFra dybde MD
[m]Til dybde MD
[m]Reduksjonsventil størrelse
[mm]1.1218721930.01.2216821800.01.32153216425.4Borestrengtester (DST) Test nummerEndelig avstengningstrykk
[MPa]Endelig strømningstrykk
[MPa]Bunnhullstrykk
[MPa]Borehullstemperatur
[°C]1.11.21.385Borestrengtester (DST) Test nummerOlje produksjon
[Sm3/dag]Gass produksjon
[Sm3/dag]Oljetetthet
[g/cm3]Gasstyngde rel. luftGOR
[m3/m3]1.11.21.3307020000.7700.68023400 -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]CBL VDL GR263800CBL VDL GR2631502CBL VDL GR CCL13522370CST8151490CST15232508DLL MSFL GR21252300HDT GR8001512ISF BHC GR3651514ISF BHC GR21252516ISF BHC MSFL GR263411ISF BHC MSFL GR15022222LDL CNL GR325411LDL CNL NGT15142517LDL GR3651514RFT21502491RFT21512151RFT22192219RFT22252225SHDT GR15022517VELOCITY4002510 -
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 formasjonstestCONDUCTOR30325.536330.00.00LOTSURF.COND.20365.026367.00.00LOTINTERM.13 3/8800.017 1/2815.01.65LOTINTERM.9 5/81502.012 1/41515.01.80LOTLINER72523.08 1/22523.00.00LOT -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling2961.05spud mud4101.1045.029.0water based8251.1448.040.0water based15151.2552.021.0water based21151.3255.018.0water based25231.2053.011.0water 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]pdf0.28