30/2-5 S
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Generell informasjon
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Brønnhistorie
GeneralWell 30/2-5 S was drilled to test the Atlantis prospect on the Mokkukalven Fault Complex about 17 kilometres south of the Kvitebjørn field in the North Sea. The primary objective was to prove petroleum in reservoir rocks in the Middle Jurassic Brent Group.Operations and resultsAn 8 1/2" pilot hole 30/2-U-1 was drilled down to 1128 m between 7 and 9 March 2020 to investigate shallow gas and to reduce complexity and uncertainty related to drilling of the main Atlantis wellbore. No shallow gas was observed in the pilot hole.Wildcat well 30/2-5 S was spudded with the semi-submersible installation West Hercules on 14 May 2020 and drilled to TD at 4390 m (4388.4 m TVD) in the Early Jurassic Drake Formation. Drilling of this HPHT well proceeded without significant problems. The well was drilled with seawater and hi-vis pills down to 1175 m, with RheGuard oil-based mud from 1175 to 4120 m, and with Warp oil-based mud from 4120 m to TD.Well 30/2-5 S encountered top Brent Group at 4203 m (4203 m TVD) with a gas-condensate column of about 160 metres in the Brent Group (the Tarbert, Ness, Etive and Rannoch Formations), of which 60 metres comprise effective sandstone reservoir. The Ness Formation has 30 metres of sandstone with poor to moderate reservoir quality, while the Etive Formation has 15 metres of sandstone, primarily of moderate quality. The Tarbert Formation has 10 metres of sandstone with poor to moderate reservoir quality, while the Rannoch Formation has 5 metres of poor-quality sandstone. Pressure points indicate a similar pressure regime in all reservoir sandstones. No oil shows were observed as expected from very low-molecular weight hydrocarbons in a gas-condensateThree coring runs were attempted, but all three cores jammed off and recovery was very poor. Core 1 recovered 3.25 m from a 20 m cored interval. Core 2 recovered 4.5 m from core point 4240 m before the core jammed off. Core 3 recovered only a 5-cm piece of core. Good quality MDT condensate samples were taken at 4275.5 m. Six out of seven samples had less than 1 %wt mud filtrate contamination.The well was permanently abandoned on 11 July 2020 as a gas/condensate discovery 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]1176.004390.00 -
Borekjerner i Sokkeldirektoratet
Borekjerner i Sokkeldirektoratet Kjerneprøve nummerKjerneprøve - topp dybdeKjerneprøve - bunn dybdeKjerneprøve dybde - enhet14220.04223.3[m ]24240.04244.6[m ]Borekjerner i Sokkeldirektoratet Total kjerneprøve lengde [m]7.8Borekjerner i Sokkeldirektoratet Kjerner tilgjengelig for prøvetaking?YES -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet17389010251025133215371935193520002032217821782468354437813800403240324057406540964110411041354203420342264316433243704370 -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]CMR GR41304390GR MDT MRMS PO42464353MDT GR MRMS SC IFA42444330MDT PA43304330MDT PA43504350MSCT GR42704365MSIP NGI PPC41164390MWD - DI173225MWD - GR RES APWD DEN NEU DI42454390MWD - GR RES APWD DEN NEU DI FTW41174220MWD - GR RES DI2252453MWD - GR RES ECD DI24534117QAIT NEXT HLDT APS HNGT HXPT40754390SAT IFA42064206SAT IFA43204320VSI4 GR9154390XLR GR41754355XLR GR42044365 -
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 formasjonstestCONDUCTOR36222.542224.50.00SURF.COND.201165.3261175.01.71FITINTERM.142443.417 1/22455.01.90LOTLINER9 7/84115.012 1/44120.02.14LOTOPEN HOLE4390.08 1/24390.00.00 -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling3631.5028.05.0RheGuard24431.6037.06.5RheGuard40162.0068.08.5WARP40762.0251.05.0WARP42202.0050.04.5WARP43902.0056.05.5WARP