25/4-2
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Generell informasjon
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Brønnhistorie
GeneralWell 25/4-2 was drilled ca 6 km ENE of the 25/4-1 Heimdal Discovery well, which encountered 106 m gas-bearing sands gas in the Paleocene Heimdal Formation and several thin sands with gas and oil in the Jurassic and late Triassic. The aim of well 25/4-2 was to explore the Heimdal sand section on a separate closure.Operations and resultsWildcat well 25/4-2 was spudded with the semi-submersible installation Neptune 7 on 18 October 1973 and drilled to TD at 2775 m in the Late Cretaceous Jorsalfare Formation.The well penetrated a 405 m thick section with Heimdal Formation sands from 2156.5 m to 2561 m. The reservoir characteristics were quite the same as in well 25/4-1: clean sands with occurrence of only small shale-sand laminae and a few carbonaceous stringers. A nine-meter thick oil column was found from top of the reservoir down to an OWC at 2165.5 m, which was estimated to be 8.5 m higher than in 25/4-1. Other reservoirs were water-wet except a very thin bed of calcareous sand between 2591 and 2597 m (Våle Formation) with some residual oil according to the log interpretation, and where a small methane kick occurred.One conventional core was cut in the interval 2159 m to 2172 m. Only 2166.6 m to 2167.4 m was recovered. Good shows with bleeding oil was observed on the recovered piece of core. Three Formation Interval Tester samples were taken. FIT 1 and 3 were taken at 2162.5 m. The FIT 1 fluid was transferred under bottom hole pressure for PVT studies. FIT 3 recovered 4.15 1itre of oil, 5.75 litre of filtrate + mud and 136 litre of gas. FIT 2 at 2165.8 m produced 9.9 1itre of water, filtrate, and mud with some traces of oil.The well was permanently abandoned on 6 December 1973 and has been classified as a minor oil discovery.TestingNo drill stem test was performed in the well. -
Borekaks i Sokkeldirektoratet
Borekaks i Sokkeldirektoratet Borekaks tilgjengelig for prøvetaking?YESBorekaks i Sokkeldirektoratet Borekaksprøve, topp dybde [m]Borekaksprøve, bunn dybde [m]495.002775.00 -
Borekjerner i Sokkeldirektoratet
Borekjerner i Sokkeldirektoratet Kjerneprøve nummerKjerneprøve - topp dybdeKjerneprøve - bunn dybdeKjerneprøve dybde - enhet12171.22172.0[m ]Borekjerner i Sokkeldirektoratet Total kjerneprøve lengde [m]0.8Borekjerner i Sokkeldirektoratet Kjerner tilgjengelig for prøvetaking?YES -
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 formasjonstestCONDUCTOR30181.036181.00.00LOTSURF.COND.13 3/8468.017 1/2475.00.00LOTINTERM.9 5/82026.012 1/42080.00.00LOTOPEN HOLE2775.08 1/22775.00.00LOT -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]CBL1442026DLT BHC GR20262775FDC CNT GR20262775GR1442026HDT20262775IES4682032IES20262775IES GR CNL21262315ML MLL20262775SL BHC4682029VELOCITY1442775 -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet144426912983101411251200203820382073211721572561272327622762 -
Spleisede logger
Spleisede logger Dokument navnDokument formatDokumentstørrelse [MB]pdf0.30 -
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk)
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk) Dokument navnDokument formatDokumentstørrelse [MB]pdf1.64pdf1.25 -
Dokumenter – eldre Sokkeldirektoratets WDSS rapporter og andre relaterte dokumenter
Dokumenter – eldre Sokkeldirektoratets WDSS rapporter og andre relaterte dokumenter Dokument navnDokument formatDokumentstørrelse [MB]pdf0.26 -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling1811.2670.013.0seawater9431.2670.05.0seawater15121.2445.08.0seawater22831.2648.04.2seawater23161.2752.012.0seawater27751.2652.04.0seawater