3/4-1
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Generell informasjon
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Brønnhistorie
GeneralWell 3/4-1 was the first well drilled in block 3/4 and was designed to penetrate and evaluate all potential hydrocarbon bearing formations above the Permian Zechstein Salt. The trap that was evaluated is a four way structural closure defined at Base Cretaceous level, formed by salt induced basin inversion, producing the present anticlinal configuration. The structure was identified using 2D seismic data in 1992, but, at that time, the structural configuration of the prospect and the composition of the clastic package could not be defined. Further geophysical, geological and geochemical studies were undertaken to better define the structure and Well 3/4-1 was drilled to help define the nature of the clastic package found in this part of block 3/4.The primary reservoir objective was the Upper Jurassic, shallow marine sandstone deposits contained in the hanging wall clastic package of the Coffee Soil Fault. Middle Jurassic sandstones were regarded as secondary objectives.Operations and resultsExploration well 3/4-1 was spudded with the jack-up installation Maersk Gallant on 11 January 1994 and drilled to TD at 3107 m, 18 m into the Permian Zechstein Salt Group. The well was drilled with seawater and bentonite sweeps down to 506 m and with "ANCO 2000" (ca 3% "ANCO 208" glycol additive) from 506 m to TD.The top of the Hordaland at 1103 m and top of the Rogaland at 2317 m were 17 m shallow and 16 m deep respectively, in relationship to prognosed tops. The top of the Chalk (Shetland Group) 2415 m was 10 m shallower than prognosed, and was 252.5 m thick, 52.5 m thicker than prognosed. No hydrocarbon bearing intervals were found in the Chalk section as had been anticipated. A total of 295 m of Jurassic section was penetrated, versus a prognosed 450m, with 184m of reservoir quality sandstones (versus a prognosed 80m). The Upper Jurassic Ula Sandstone was 184 m thick, 104 m thicker than prognosed, and was dominantly clean sand. There were no free oil shows in the Jurassic section; however, the lower 20 m of the Ula Sandstone contained some bitumen. The Triassic Smith Bank Formation, not prognosed, was penetrated at 3013 m. The top of the Permian (Zechstein) at 3077 m was 58 m shallower than prognosed.An 18 m core was cut from 2740 m to 2758 m in the Ula Formation Sand. A FMT sample was taken at 2758.5 m. It recovered 9.4 litres (upper chamber) and 4.1 litres (lower chamber) of formation water. Analyses on the water from the lower chamber, carried out by Geco-Prakla in Stavanger, gave results that closely matched those found at the rig site, but Geco-Prakla also found 29.2 mg/1 of nitrates. Its presence, plus an ionic imbalance and the presence of potassium and sulphate, indicated that this chamber contained formation water mixed with a little mud filtrate.The well was permanently abandoned on 26 February 1994 as a dry hole with only rare bitumen shows.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]200.003105.00 -
Borekjerner i Sokkeldirektoratet
Borekjerner i Sokkeldirektoratet Kjerneprøve nummerKjerneprøve - topp dybdeKjerneprøve - bunn dybdeKjerneprøve dybde - enhet12740.02758.1[m ]Borekjerner i Sokkeldirektoratet Total kjerneprøve lengde [m]18.1Borekjerner i Sokkeldirektoratet Kjerner tilgjengelig for prøvetaking?YES -
Kjernebilder
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Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet921103231723172330237524152415245425892668266826702718271827262736273629202920301330133077 -
Spleisede logger
Spleisede logger Dokument navnDokument formatDokumentstørrelse [MB]pdf0.46 -
Geokjemisk informasjon
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Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk)
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk) Dokument navnDokument formatDokumentstørrelse [MB]pdf131.22 -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]COREGUN27183048DIFL DGR23402964DLL GR5001507DLL MLL DAC DGR15073095DLL ZDEN GR5001507FMT PRETEST27382908FMT SAMPLE27582758HEXDIP15073100MWD - DIR5063090MWD - GR RES92506VSP5003090ZDEN CN GR15073095 -
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 formasjonstestCONDUCTOR30183.036186.00.00LOTSURF.COND.20502.026506.00.00LOTINTERM.13 3/81509.017 1/21515.00.00LOTOPEN HOLE3107.012 1/43107.00.00LOT -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling2541.085.0WATER BASED3751.075.0WATER BASED5061.147.0WATER BASED10081.3718.0WATER BASED12501.3820.0WATER BASED15151.4025.0WATER BASED22971.4924.0WATER BASED26831.5024.0WATER BASED27241.5023.0WATER BASED27581.5017.0WATER BASED27761.5129.0WATER BASED30071.5022.0WATER BASED31071.5022.0WATER 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]pdf0.21