34/10-46 A
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Generell informasjon
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Brønnhistorie
p> GeneralWell 34/10-46 A was drilled to a structure 5 km southwest of the Gullfaks field. Due to a water-filled Statfjord Formation in segment D1 in well 34/10-46 S, it was decided to drill a side track, 34/10-46 A to the Brent Group prospect D1. The objectives of the well were to prove oil in a Cretaceous/Brent Group prospect in D1 and to be a water injector in Tarbert Formation.OperationsThe wildcat well 34/10-46 A was spudded on 2 February 2002 from the permanent installation Gullfaks A and drilled to TD at 6860 m (2105,5 m TVD RKB) in the late Cretaceous Shetland Group. The well was drilled with OBM to TD.Kick-off point was at 3930 m (1667 m TVD MSL). In well 34/10-46 S/46 A/46 B the Brent Group in segment E1 and the Statfjord Formation in segment D1 were reached by the 12 1/4" section. At 6344 m (1920 m TVD MSL, 5 m deeper than prognosed) a gas-filled, pressure-depleted sandstone was encountered. A loss situation arose when drilling out of the sandstone and casing was set close to the top sandstone. From 6401 m to TD the well encountered Shetland shale three times and the Tarbert Formation twice.The well missed the geological target (40 m to the west of target) and drilled too close to the western edge of the structure. This has resulted in a large uncertainty concerning the age of the uppermost sandstone between 6344 m and 6401 m. The most likely interpretation of the section is Cretaceous age. The well proved a gas column of 20 m in this sandstone (Krans Member/Kyrre Formation) and an oil column of 2 m in the Brent Group. Neither the gas-oil contact nor the oil-water contact was identified due to shale lithology at the respective depths.The MDT measurements in the Cretaceous sandstones penetrated in 46 A show a pore pressure corresponding to ~1,36 sg EMW, as indicated by pressure prognosis given prior to drilling.No fluid samples were collected and no coring was performed in the well.Running the liner in well 34/10-46 A failed due to restrictions in the hole, and the well was plugged back to the 9 5/8" shoe. Pulled out of hole with cement stringer on 16 March 2002 and the well was re-classed to development well 34/10-A-48 A.TestingTestingNo 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]3960.006862.00 -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet21617282230223025303251634464756475659267096709 -
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk)
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk) Dokument navnDokument formatDokumentstørrelse [MB].TIF47.78.PDF0.58 -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]MWD LWD - GR39306400MWD LWD - GR RES DEN NEU64006860PEX MDT64006860 -
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 formasjonstestINTERM.9 5/86346.012 1/46400.00.00LOTOPEN HOLE6860.08 1/26860.00.00LOT -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling39351.6455.0VERSAVERT44401.6457.0VERSAVERT50891.6456.0VERSAVERT63041.6459.0VERSAVERT63541.5032.0VERSAVERT64001.5042.0VERSAVERT67161.5040.0VERSAVERT68601.5032.0VERSAVERT -
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