25/11-7
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Generell informasjon
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Brønnhistorie
GeneralWell 25/11-7 was drilled ca 3 km west-south west of the 25/11-1 Balder discovery well on the Utsira High in the North Sea. The primary objective was to delineate topographic mounds developed in the Paleocene sands of the Balder Field. The primary targets were the Zone II sand (E-70 sand) which was found oil-bearing in the 25/11-5 and the Zone I-B sands which were found oil-bearing in the 25/11-6.Operations and resultsAppraisal well 25/11-7 was spudded with the semi-submersible installation Norskald on 3 October 1978 and drilled to TD at 1944 m in the Late Cretaceous Tor Formation. The well was drilled with Seawater/Gel/Lignosulphonate.The well penetrated the Utsira Formation and several Skade Formation sands and then penetrated a ca 600 m thick section of shales belonging to the lower Hordaland Group before top Balder Formation was encountered at 1697 m. The Balder Formation contained some shaley sands with poor to no oil shows. The massive I-B sand at 1750.3 m (Heimdal Formation) was the only significant oil sand in the well. The well proved 36 m of net oil sand with a clear oil-water contact at 1786.5 m (1761.5 m MSL), in reasonable agreement with the Balder Field contact at 1760 m MSL established in 25/11-6. The Zone II (E-70) sand was absent, or possibly an unrecognizable part of the I-B Sand.A total of 20.35 m core was recovered in four cores from the interval 1748.6 to 1772.3 m in the Lista and Heimdal Formations. No wire line fluid samples were taken.The well was permanently abandoned on 27 October 1978 as an oil appraisal 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]1070.001945.30 -
Borekjerner i Sokkeldirektoratet
Borekjerner i Sokkeldirektoratet Kjerneprøve nummerKjerneprøve - topp dybdeKjerneprøve - bunn dybdeKjerneprøve dybde - enhet11748.61751.0[m ]21751.01753.0[m ]31753.01762.4[m ]41762.41772.3[m ]Borekjerner i Sokkeldirektoratet Total kjerneprøve lengde [m]23.7Borekjerner i Sokkeldirektoratet Kjerner tilgjengelig for prøvetaking?YES -
Palynologiske preparater i Sokkeldirektoratet
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Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet14959874276776792596097510551087166716671678169717011711171617511850186218751918192119211930 -
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Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]CAL13111845DLL MSFL15001945FDC CNL15001945GR149410HDT15001945ISF SONIC184410ISF SONIC3961316ISF SONIC13111944VELOCITY9301945 -
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 formasjonstestCONDUCTOR30186.036186.00.00LOTINTERM.13 3/8396.017 1/2412.00.00LOTINTERM.9 5/81308.012 1/41325.00.00LOTOPEN HOLE1944.08 1/21944.00.00LOT -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling1860.00waterbased6941.08waterbased13251.06waterbased15311.11waterbased19441.13waterbased