25/10-7 S
Eksport: PDF
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Generell informasjon
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Brønnhistorie
GeneralWell 25/10-7 S is located southwest of the Balder area. The primary objective of the well was to evaluate resource potential in the Paleocene Heimdal Formation in the Bjørn Prospect. Secondary objective was to evaluate resource potential in the Lower Eocene interval based on a high amplitude seismic response.Operations and resultsExploration well 25/10-7 S was spudded with the semi-submersible installation "Vildkat Explorer" on 20 May 1996 and drilled to TD at 2617 m (2582 m TVD) in the Early Paleocene Ekofisk Formation. The well was drilled with seawater and bentonite down to 1102 m and with "ANCOVERT" oil based mud from 1102 m to TD. The well was drilled deviated to avoid shallow gas at a depth of 512-822 meters below sea level close to the proposed location. The surface location of 25/10-7 S was moved approximately 200 m south of the reservoir target location, and no shallow gas was seen at this location. The well was drilled vertically to 1165 m where angle was gradually built to max 25.8 degrees and then again reduced to 1& at 2000 m. Well time for 25/10-7 S was 19.78 days (vs. 31 days targeted) for $4.7 M (vs. an AFE of $6.7 M). A major contribution to the reduced time and cost was a reduction of the electric logging program from the planned 4 days to the actual of 0.6 days due to a labour dispute involving key service companies in Norway. A 233 m thick Heimdal Formation was penetrated by the well, starting at 2238 m. The secondary, Eocene target was a 22 m thick limestone. The plan was to cut one core in the top of the Heimdal sand, regardless of hydrocarbon shows. Coring continued after core no.2 based on shows described at well site. A total of five cores were cut from 2200-2378 m from the Lista Formation through a complete Heimdal sequence and into the Lista Formation again. Subsequent to the coring MWD logs reamed across cored interval showed reservoir to be water wet. In the end onshore geochemical analyses identified the core "shows" as contamination from the mud. In addition to the MWD GR-AIT-LDT-CNL-Array Sonic and VSP was run. The wire line logs showed a dry hole. The work program also had SWC's and MDT pressures and one sample planned, but as the wire line logs confirmed a dry hole, it was decided to abort the planned program and plug the well. The well was permanently abandoned as a dry well on June 8, 1996.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]1110.002617.00 -
Borekjerner i Sokkeldirektoratet
Borekjerner i Sokkeldirektoratet Kjerneprøve nummerKjerneprøve - topp dybdeKjerneprøve - bunn dybdeKjerneprøve dybde - enhet12200.02230.3[m ]22232.02269.2[m ]32269.22306.7[m ]42306.72342.4[m ]52342.42380.0[m ]Borekjerner i Sokkeldirektoratet Total kjerneprøve lengde [m]178.3Borekjerner i Sokkeldirektoratet Kjerner tilgjengelig for prøvetaking?YES -
Kjernebilder
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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 formasjonstestSURF.COND.30202.036203.00.00LOTINTERM.9 5/81085.012 1/41086.00.00LOTOPEN HOLE2617.08 1/22617.00.00LOT -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]AIT AS LDT CNL GR10852592MWD - GR EWR4 DIR2502605VSP GR13702515 -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet142586726823823105611031125115311941526153815531632208620862122218622382373240424272465249825692569 -
Spleisede logger
Spleisede logger Dokument navnDokument formatDokumentstørrelse [MB]pdf0.49 -
Geokjemisk informasjon
Geokjemisk informasjon Dokument navnDokument formatDokumentstørrelse [MB]pdf1.76 -
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk)
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk) Dokument navnDokument formatDokumentstørrelse [MB]pdf1.94pdf121.79 -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling9851.3943.0OIL BASED11021.3732.0OIL BASED17100.1747.0OIL BASED22001.3743.0OIL BASED22300.1737.0OIL BASED22651.3941.0OIL BASED23061.3741.0OIL BASED23801.3834.0OIL BASED25041.3735.0OIL BASED25471.3836.0OIL BASED26171.3940.0OIL BASED