7121/5-1
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Generell informasjon
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Brønnhistorie
GeneralWildcat well 7121/5-1 is located on the eastern part of the Snøhvit Field. It was drilled about 75 m down flank on the Alpha-structure in the block. The Snøhvit structure consists of an east-west running horst and a rotated normal faulted block. The main objective in the well was to test possible reservoir rocks of Jurassic/Triassic age as seen in neighbouring wells.Operations and resultsWell 7121/5-1 was spudded with the semi-submersible installation West Vanguard on 7 June 1985 and drilled to TD at 3200 m. The rig was shut down from 16 June to 30 June due to a strike. Otherwise drilling proceeded without significant problems. The well was drilled with spud mud down to 865 m, with a gypsum/polymer mud from 865 m to 1925 m, and with polymer mud from 1925 m to TD.Top reservoir came in at 2369 m with hydrocarbons. From RFT pressure measurements the gas/oil contact was found at 2427.5 m and the oil/water contact at 2442 m. Logs displayed sands with possible hydrocarbons in Triassic sandstones, but increasing shale down hole reduced porosity/permeability and DST test confirmed a tight formation. Geochemical analyses showed immature rocks until 2250 m and marginal to significant maturity in Triassic/Jurassic rocks respectively. Nine cores were cut in the interval 2365 m to 2523 m in the Stø, Nordmela and Tubåen Formations. One core was cut from 3088 m to 3109 m in the Triassic Snadd Formation. Four RFT segregated samples were taken in the upper part of the Stø and Nordmela Formations from 2370 m to 2434 m, one in the Tubåen Formation at 2507 m, and one at 2802.7 m in the Snadd Formation. A small amount of condensate in the sample from 2370 m was the only reported liquid hydrocarbons from the RFT samples. Otherwise gas was recovered in the samples from 2424 m and 2370 m, while the sample from 2507 recovered mainly water/mud filtrate and minor gas. The sample from 2802.7 m contained only minor amounts of mud filtrate and no hydrocarbons. Some weak shows were recorded in the SnaddFormation. The well was permanently abandoned on 28 September 1985 as an oil and gas appraisal.TestingThree drill stem tests were performed. DST lA from 2802 m to 2820 m in Triassic sandstones gave no response from the formation. DST l tested the interval 2436 m to 2439 m near base of the Stø Formation. The 9-5/8" casing was first perforated with 6 shots/foot, and after that the well was re-perforated by 12 shots/foot (DST l RR) in an attempt to improve flowing rates. DST 1 produced oil and gas during the main flow at a rate of 229.1 Sm3 and 27190 Sm3, respectively through a 12.7 mm choke. The gas/oil ratio was 119 Sm3/Sm3. DST 2 perforated the interval 2394 m to 2403 m in the upper part of the Stø Formation. This test gave no response and the formation was considered tight. -
Borekaks i Sokkeldirektoratet
Borekaks i Sokkeldirektoratet Borekaks tilgjengelig for prøvetaking?YESBorekaks i Sokkeldirektoratet Borekaksprøve, topp dybde [m]Borekaksprøve, bunn dybde [m]420.003197.00 -
Borekjerner i Sokkeldirektoratet
Borekjerner i Sokkeldirektoratet Kjerneprøve nummerKjerneprøve - topp dybdeKjerneprøve - bunn dybdeKjerneprøve dybde - enhet12365.02392.0[m ]22392.02400.4[m ]32400.42428.0[m ]42428.32442.0[m ]52442.02470.0[m ]62470.02498.0[m ]72498.02509.0[m ]82509.02509.0[m ]92509.42536.0[m ]103082.03103.0[m ]Borekjerner i Sokkeldirektoratet Total kjerneprøve lengde [m]191.3Borekjerner i Sokkeldirektoratet Kjerner tilgjengelig for prøvetaking?YES -
Kjernebilder
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Palynologiske preparater i Sokkeldirektoratet
Palynologiske preparater i Sokkeldirektoratet Prøve dybdeDybde enhetPrøve typeLaboratorie500.0[m]DCGERH510.0[m]DCGERH520.0[m]DCGERH530.0[m]DCGERH550.0[m]DCGERH560.0[m]DCGERH570.0[m]DCGERH600.0[m]DCGERH610.0[m]DCGERH620.0[m]DCGERH630.0[m]DCGERH640.0[m]DCGERH650.0[m]DCGERH660.0[m]DCGERH670.0[m]DCGERH680.0[m]DCGERH690.0[m]DCGERH700.0[m]DCGERH710.0[m]DCGERH720.0[m]DCGERH730.0[m]DCGERH740.0[m]DCGERH750.0[m]DCGERH760.0[m]DCGERH770.0[m]DCGERH780.0[m]DCGERH790.0[m]DCGERH800.0[m]DCGERH810.0[m]DCGERH820.0[m]DCGERH830.0[m]DCGERH840.0[m]DCGERH850.0[m]DCGERH870.0[m]DCGERH900.0[m]DCGERH910.0[m]DCGERH920.0[m]DCGERH930.0[m]DCGERH940.0[m]DCGERH962.0[m]DCGERH974.0[m]DCGERH986.0[m]DCGERH998.0[m]DCGERH1019.0[m]DCGERH1031.0[m]DCGERH1043.0[m]DCGERH1067.0[m]DCGERH1079.0[m]DCGERH1091.0[m]DCGERH1115.0[m]DCGERH1127.0[m]DCGERH1139.0[m]DCGERH1151.0[m]DCGERH1169.0[m]DCGERH1181.0[m]DCGERH1193.0[m]DCGERH1200.0[m]SWCGERH1217.0[m]DCGERH1232.0[m]DCGERH1247.0[m]DCGERH1262.0[m]DCGERH1277.0[m]DCGERH1292.0[m]DCGERH1307.0[m]DCGERH1322.0[m]DCGERH1337.0[m]DCGERH1367.0[m]DCGERH1382.0[m]DCGERH1397.0[m]DCGERH1412.0[m]DCGERH1427.0[m]DCGERH1445.0[m]DCGERH1469.0[m]DCGERH1481.0[m]DCGERH1496.0[m]DCGERH1511.0[m]DCGERH1511.0[m]DCGERH1526.0[m]DCGERH1550.0[m]DCGERH1562.0[m]DCGERH1574.0[m]DCGERH1589.0[m]DCGERH1604.0[m]DCGERH1616.0[m]DCGERH1646.0[m]DCGERH1661.0[m]DCGERH1676.0[m]DCGERH1691.0[m]DCGERH1721.0[m]DCGERH1736.0[m]DCGERH1751.0[m]DCGERH1766.0[m]DCGERH1775.0[m]DCGERH1781.0[m]DCGERH1796.0[m]DCGERH1811.0[m]DCGERH1826.0[m]DCGERH1841.0[m]DCGERH1871.0[m]DCGERH1886.0[m]DCGERH1901.0[m]DCGERH1910.0[m]DCGERH1925.0[m]DCGERH1934.0[m]DCGERH1949.0[m]DCGERH1952.0[m]DCGERH1964.0[m]DCGERH1979.0[m]DCGERH1994.0[m]DCGERH2009.0[m]DCGERH2024.0[m]DCGERH2028.0[m]DCGERH2039.0[m]DCGERH2054.0[m]DCGERH2069.0[m]DCGERH2084.0[m]DCGERH2099.0[m]DCGERH2114.0[m]DCGERH2129.0[m]DCGERH2142.0[m]SWCGERH2144.0[m]DCGERH2159.0[m]DCGERH2174.0[m]DCGERH2189.0[m]DCGERH2204.0[m]DCGERH2218.0[m]SWCGERH2234.0[m]DCGERH2249.0[m]DCGERH2256.0[m]SWCGERH2264.0[m]DCGERH2270.0[m]DCGERH2285.0[m]DCGERH2294.0[m]DCGERH2305.0[m]DCGERH2310.0[m]SWCGERH2313.5[m]CGERH2314.0[m]SWCGERH2323.0[m]CGERH2327.0[m]SWCGERH2334.0[m]SWCGERH2344.0[m]SWCGERH2349.0[m]SWCGERH2355.0[m]SWCGERH2359.0[m]SWCGERH2365.0[m]CGERH2372.0[m]CGERH2380.0[m]CGERH2390.0[m]CGERH2391.0[m]CGERH2395.0[m]CGERH2399.0[m]DCGERH2400.0[m]CGERH2407.0[m]CGERH2429.0[m]CGERH2445.0[m]CGERH2452.0[m]CGERH2464.0[m]CGERH2473.0[m]CGERH2483.0[m]CGERH2490.7[m]CICHRON2492.0[m]CGERH2501.0[m]CGERH2509.0[m]CGERH2509.0[m]CICHRON2520.0[m]CGERH2531.0[m]CGERH2535.0[m]CGERH2535.9[m]CICHRON2546.0[m]CGERH2546.0[m]DCRRI2555.0[m]DCRRI2558.0[m]DCGERH2564.0[m]DCRRI2567.0[m]DCRRI2570.0[m]DCGERH2582.0[m]DCGERH2594.0[m]DCGERH2606.0[m]DCGERH2618.0[m]DCGERH2630.0[m]DCGERH2643.0[m]SWCGERH2654.0[m]DCGERH2666.0[m]DCGERH2672.0[m]SWCGERH2678.0[m]DCGERH2682.0[m]SWCGERH2687.0[m]SWCGERH2695.0[m]SWCGERH2702.0[m]DCGERH2714.0[m]DCGERH2726.0[m]DCGERH2738.0[m]SWCGERH2750.0[m]DCGERH2762.0[m]DCGERH2786.0[m]DCGERH2796.0[m]SWCGERH2810.0[m]DCGERH2822.0[m]DCGERH2842.0[m]SWCGERH2914.0[m]SWCGERH2948.0[m]SWCGERH2951.0[m]DCGERH3074.0[m]DCGERH3084.0[m]CGERH3091.0[m]CGERH3093.0[m]CGERH3116.0[m]DCGERH3164.0[m]DCGERH -
Oljeprøver i Sokkeldirektoratet
Oljeprøver i Sokkeldirektoratet Test typeFlaske nummerTopp dyp
MD [m]Bunn dyp
MD [m]Væske typeTest tidspunktPrøver tilgjengeligDSTDST12436.002439.0004.09.1985 - 00:15YES -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet35846046010051005103610361930223622922357236923692445250725722572266027382793 -
Spleisede logger
Spleisede logger Dokument navnDokument formatDokumentstørrelse [MB]pdf0.58 -
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]pdf0.31pdf0.25 -
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk)
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk) Dokument navnDokument formatDokumentstørrelse [MB]pdf44.00 -
Borestrengtester (DST)
Borestrengtester (DST) Test nummerFra dybde MD
[m]Til dybde MD
[m]Reduksjonsventil størrelse
[mm]1.1280228200.01.22436243912.72.0239424030.0Borestrengtester (DST) Test nummerEndelig avstengningstrykk
[MPa]Endelig strømningstrykk
[MPa]Bunnhullstrykk
[MPa]Borehullstemperatur
[°C]1.11.23.50016.300902.0Borestrengtester (DST) Test nummerOlje produksjon
[Sm3/dag]Gass produksjon
[Sm3/dag]Oljetetthet
[g/cm3]Gasstyngde rel. luftGOR
[m3/m3]1.11.2229271900.8601192.0 -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]CBL VDL GR4752726CET GR15002726CNL GR CASED23502500CST8601903CST19522738CST27553178DLL MSFL SP GR23492534ISF SONIC SMFL SP GR4193200LDL CNL GR4193200NGS19073201RFT HP23702518RFT HP25082662RFT ST23702507RFT ST28023118SHDT8483180TDT GR23502500TDT GR23502500TEMP10002000VSP4053200 -
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 formasjonstestCONDUCTOR30419.536423.00.00LOTSURF.COND.20849.526879.01.43LOTINTERM.13 3/81912.017 1/21929.01.59LOTINTERM.9 5/82739.012 1/42755.01.74LOTLINER73200.08 1/23200.00.00LOT -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling8771.06600.016.0WATER BASED13.06.19858771.06600.013.5WATER BASED14.06.19858771.06600.013.5WATER BASED14.06.19858791.171200.09.3WATER BASED17.06.19858791.17WATER BASED17.06.19858791.17WATER BASED19.06.19858791.17WATER BASED20.06.19858791.001400.06.8WATER BASED01.07.19858791.06600.011.4WATER BASED17.06.19858791.17WATER BASED24.06.19858791.001400.06.8WATER BASED01.07.19858791.17WATER BASED24.06.19858791.171200.09.3WATER BASED17.06.19858791.17WATER BASED17.06.19858791.17WATER BASED19.06.19858791.17WATER BASED20.06.19858851.101500.07.6WATER BASED03.07.19858851.111600.08.9WATER BASED05.07.19858851.111600.08.9WATER BASED05.07.198513931.111500.09.7WATER BASED05.07.198517231.121500.06.3WATER BASED08.07.198518601.121500.07.2WATER BASED08.07.198519251.141700.08.4WATER BASED09.07.198519251.146000.06.8WATER BASED10.07.198519251.146000.06.8WATER BASED10.07.198520831.151500.08.1WATER BASED15.07.198521611.151600.08.0WATER BASED15.07.198522541.151600.07.6WATER BASED15.07.198523091.151600.08.0WATER BASED16.07.198523531.301900.08.5WATER BASED19.07.198523531.301900.08.5WATER BASED19.07.198523531.301900.07.6WATER BASED18.07.198523651.301900.010.2WATER BASED18.07.198523921.301900.07.6WATER BASED18.07.198524531.341800.011.0WATER BASED22.07.198525001.341700.09.3WATER BASED29.07.198525361.341700.010.0WATER BASED29.07.198525371.341700.010.0WATER BASED29.07.198525391.341700.09.3WATER BASED29.07.198525401.231200.05.0WATER BASED04.09.198525401.231000.04.6WATER BASED05.09.198525401.231000.05.5WATER BASED06.09.198525401.231000.05.1WATER BASED09.09.198525401.23900.04.2WATER BASED10.09.198525401.23900.04.2WATER BASED11.09.198525401.23900.04.2WATER BASED12.09.198525401.23800.04.2WATER BASED13.09.198525441.231400.06.3WATER BASED30.08.198525441.231400.05.9WATER BASED02.09.198525461.231500.07.2WATER BASED30.08.198525481.341700.09.7WATER BASED30.07.198525721.341900.09.3WATER BASED31.07.198526001.342200.09.7WATER BASED01.08.198526071.342000.09.7WATER BASED01.08.198526281.342100.09.3WATER BASED02.08.198526531.341900.010.2WATER BASED05.08.198526971.342100.010.6WATER BASED05.08.198527471.342100.09.7WATER BASED06.08.198527471.342100.09.7WATER BASED06.08.198527471.342100.09.7WATER BASED05.08.198527551.168.01900.0WATER BASED12.08.198527551.342100.09.3WATER BASED08.08.198527551.168.01900.0WATER BASED12.08.198527921.161700.08.5WATER BASED12.08.198528021.231500.06.7WATER BASED28.08.198528551.161700.08.0WATER BASED12.08.198529331.161500.08.5WATER BASED13.08.198529801.161500.08.0WATER BASED14.08.198530441.161600.07.2WATER BASED15.08.198530821.161600.07.2WATER BASED16.08.198531611.161500.07.6WATER BASED26.08.198531611.231400.07.2WATER BASED27.08.198531611.231500.07.2WATER BASED26.08.1985 -
Tynnslip i Sokkeldirektoratet
Tynnslip i Sokkeldirektoratet DybdeEnhet2505.00[m ]2507.00[m ]2512.35[m ]2514.35[m ]2517.00[m ]2524.65[m ]2526.65[m ]2530.00[m ]2535.35[m ] -
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