16/4-1
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Generell informasjon
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Brønnhistorie
GeneralWell 16/4-1 is located on the Utsira High. The primary objective of the well was to test the Paleocene Heimdal Formation. Secondary objectives were Jurassic and Triassic sandstones, Zechstein carbonates and Rotliegendes conglomerates. The well was planned to reach TD at 2850 m + 100 m after having identified a seismic reflector at this depth, interpreted to represent Top Metamorphic Basement.Operations and resultsWildcat well 16/4-1 was spudded with the semi-submersible installation Treasure Seeker on 8 September 1984 and drilled to TD at 2909 m in crystalline/metamorphic basement of Early Paleozoic age. Under the 30" casing shoe a 17 1/2" pilot hole was drilled. At 494 m in Pleistocene sand and shale, the well started to flow up the annulus from a small gas pocket. The well died out by itself but there were problems with lost circulation, so a cement plug was set from 494 - 415 m. The cement was drilled out to 480 m and the hole was underreamed to 26" before landing of the 20" casing. No other major problems occurred during drilling of this well. The well was drilled with seawater and bentonite down to 494 m, with KCl/polymer mud from 494 m to 2052 m, and with NaCl/polymer mud from 2052 m to TD.The well 16/4-1 encountered water-bearing sandstones in the Paleocene Heimdal Formation as well as in the Triassic. The latter is a 36 m thick sand in between the Smith Bank Formation and the Zechstein Group. The Heimdal Formation Sandstones occur as interbedded sand/claystone in the upper part (2100 m to 2142 m) and as a massive sandstone, which is homogenous and very clean in the lower part (2142 m 2277 m). The Triassic sandstones (2394 m to 2430 m) were very fine-to-fine grained with a considerable amount of silt and mica. Log evaluations over these sands gave the following results: The interval 2100 m to 2142 m gave a net/gross ratio of 0.095, with an average porosity of 23,06% and a shale volume of 43,58% after cut-off. The interval 2142 m to 2277 m had a N/G of 0,89 with 26,36% average porosity and 11,19% shale volume. The Triassic interval (2394 m to 2430 m) had a net/gross of 0,37 with 22,88% average porosity and 18,54% shale volume. All these values are calculated after a cut-off of 20% (1 mD). Twenty-five pressure tests (RFT) were performed from 2083 m to 2422.4 m. These gave a water gradient of 0,445 psi/ft (1.024 g/cc) in the Heimdal Fm sandstones. No pressure data were obtained from the Triassic.Three cores were cut in this well, the first and second in sandstones of the Heimdal and Smith Bank formations respectively. The third core was taken in metamorphic/crystalline basement. Core 1 was cut from 2161 m to 2174 m in the Heimdal formation. The recovered core of 11 m (85%) consisted of very fine to medium grained, poorly sorted sandstone with claystone in the interval 2170-71 m. Core 2 was cut from 2404 m to 2422 m and 17.5 m (97%) was recovered. The core was cut in the Triassic sand under the Smith Bank Formation. It consisted of micaceous sandstones and siltstones with subordinate clay clasts. Core 3 was cut from 2907 m to 2909 m in the Basement and 100% was recovered. The core consisted of schist and granite. No fluid samples were collected. The well was permanently abandoned on 18 November 1984 as a dry well.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]210.002907.00 -
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Kjernebilder
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Palynologiske preparater i Sokkeldirektoratet
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Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet121761998114711851280131119891989201120362142227722852315231523252333233323372337239424302430261926212885 -
Spleisede logger
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Geokjemisk informasjon
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Dokumenter – eldre Sokkeldirektoratets WDSS rapporter og andre relaterte dokumenter
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Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]CBL VDL1252015CET CBL VDL4502015CST20352340CST23452896ISF LSS GR SP2062027ISF LSS GR SP24062907ISF MSFL LSS GR SP20282666LDL CNL CAL GR4722907RFT20832422SHDT20162908VSP2002909 -
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 formasjonstestCONDUCTOR30206.036280.00.00LOTSURF.COND.20480.026497.01.37LOTINTERM.16626.022650.01.89LOTINTERM.13 3/82028.017 1/22066.01.79LOTOPEN HOLE2909.012 1/42909.00.00LOT -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling1500.00WATER BASED14.11.19842801.095.02.0WATER BASED10.09.19844941.10WATER BASED12.09.19844941.10WATER BASED13.09.19844941.10WATER BASED14.09.19844941.10WATER BASED16.09.19844941.10WATER BASED17.09.19844941.10WATER BASED18.09.19844941.10WATER BASED13.09.19844941.10WATER BASED17.09.19844941.10WATER BASED18.09.19844941.10WATER BASED20.09.19844941.10WATER BASED19.09.19844941.10WATER BASED20.09.19844941.10WATER BASED14.09.19844941.10WATER BASED16.09.19844941.10WATER BASED19.09.19844971.1517.095.0WATER BASED25.09.19845721.2515.07.0WATER BASED12.11.19846251.1616.09.0WATER BASED25.09.19846251.1614.09.0WATER BASED26.09.19846251.1614.010.0WATER BASED27.09.19846251.1614.011.0WATER BASED01.10.19846251.1614.011.0WATER BASED01.10.19846251.1614.09.0WATER BASED26.09.19846251.1614.010.0WATER BASED27.09.19846501.1515.08.0WATER BASED01.10.19847121.1619.08.0WATER BASED01.10.198411121.1619.08.0WATER BASED01.10.198415071.1819.010.0WATER BASED02.10.198415071.2515.09.0WATER BASED03.10.198415071.2515.09.0WATER BASED03.10.198416021.3017.010.0WATER BASED04.10.198418131.3018.08.0WATER BASED07.10.198418251.3016.08.0WATER BASED14.10.198418701.2516.08.5WATER BASED12.11.198418701.2516.08.5WATER BASED14.11.198418701.2516.08.5WATER BASED14.11.198419571.3016.08.0WATER BASED07.10.198419881.3024.013.0WATER BASED14.10.198420521.3032.011.0WATER BASED14.10.198420521.309.010.0WATER BASED15.10.198420521.2520.013.0WATER BASED16.10.198420521.3018.09.0WATER BASED08.10.198420521.3018.08.0WATER BASED10.10.198420521.3015.08.0WATER BASED11.10.198420521.3018.09.0WATER BASED08.10.198420521.3018.08.5WATER BASED09.10.198420521.3018.08.0WATER BASED10.10.198420521.3015.08.0WATER BASED11.10.198420521.3032.011.0WATER BASED14.10.198420521.309.010.0WATER BASED15.10.198420521.2520.013.0WATER BASED16.10.198420521.3018.012.0WATER BASED07.10.198420521.3018.08.5WATER BASED09.10.198420661.2316.08.0WATER BASED17.10.198421611.2019.09.5WATER BASED18.10.198421611.2014.05.0WATER BASED22.10.198421611.2115.09.5WATER BASED21.10.198421611.2115.09.5WATER BASED21.10.198421611.2014.05.0WATER BASED22.10.198421741.2013.07.0WATER BASED23.10.198422831.2520.07.0WATER BASED24.10.198423551.2518.07.0WATER BASED25.10.198424041.2517.08.0WATER BASED29.10.198424401.2518.09.0WATER BASED29.10.198425011.2518.09.0WATER BASED29.10.198425731.2546.010.0WATER BASED31.10.198425881.2518.010.0WATER BASED31.10.198425881.2518.010.0WATER BASED01.11.198425881.2518.010.0WATER BASED01.11.198426721.2519.09.0WATER BASED02.11.198427331.2519.08.0WATER BASED05.11.198427951.2519.08.0WATER BASED05.11.198428541.2519.08.0WATER BASED05.11.198428921.2545.025.0WATER BASED06.11.198429071.2518.08.5WATER BASED07.11.198429091.2518.08.5WATER BASED08.11.198429091.2518.08.5WATER BASED09.11.198429091.2515.07.0WATER BASED12.11.198429091.2518.08.5WATER BASED09.11.198429091.2515.07.0WATER BASED12.11.1984 -
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