25/9-2 S
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Generell informasjon
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Brønnhistorie
GeneralWildcat well 25/9-2 S is located east of the Jotun and the Ringhorne fields and had the Middle Jurassic Brent reservoir ina stratigraphic pinch-out trap as the primary target. Initial "Shallow Hazard Site Survey" indicated moderate probability of shallow gas. The surface location was therefore moved 490 m to an area showing low probability of shallow gas. The result was the need to drill a deviated well with maximum sail angle of 26.44 degrees. A 9 5/8" slim hole well design was chosen instead of a 13 3/8" surface casing design, based on earlier experience in the field, and due to no production testing planned for the well. In the deviated well path a potential shallow gas interval was identified pre-drill, by a seismic amplitude anomaly at approximately 930 m.Operations and resultsWell 25/9-2 S was spudded with the semi-submersible installation Deepsea Trym on 18 July 2003 and drilled to TD at 2250 m in the Early Jurassic Burton Formation. The shallow section at 930 m was drilled with a 9 7/8'' pilot hole. No shallow gas was encountered. The well was drilled with seawater and hi-vis sweeps down to 1055 m and with Versavert oil based mud from 1055 m to TD.A thin water-wet sand of Callovian age (Hugin Formation) was encountered at 2183 m. The Brent reservoir was not present as prognosed and no hydrocarbons were identified. MWD was the only logging program run in the well. No coring, wire line logging, or fluid sampling was performed in the well as no hydrocarbon sand was encountered.The well was permanently abandoned on 3 August 2003 as a dry well.TestingNo drill stem test was performed -
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Borekaks i Sokkeldirektoratet Borekaks tilgjengelig for prøvetaking?YESBorekaks i Sokkeldirektoratet Borekaksprøve, topp dybde [m]Borekaksprøve, bunn dybde [m]1060.002250.00 -
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 formasjonstestCONDUCTOR30218.036223.00.00LOTSURF.COND.9 5/81051.012 1/41055.01.65LOTOPEN HOLE2250.08 1/22250.00.00LOT -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]MWD - GR RES DENS NEUT10572250MWD - GR RES DIR2231057 -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet14771410021832183219231975202520362036205020672110211021532163216321732183218321902190 -
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Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling4820.00WBM10571.00OBM11891.3935.0OBM22500.00NAF -
Palynologiske preparater i Sokkeldirektoratet
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