25/8-12 S
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Generell informasjon
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Brønnhistorie
GeneralWell 25/8-12 S was drilled to appraise the southern extension of the 25/8-11 discovery on the Ringhorn structure. In the Ringhorn structure, the BCU is also the base of the chalk and represents the overall top of the Lower Jurassic reservoir interval. The primary objective for 25/8-12 S was Lower Jurassic. Paleocene Hermod sands was a secondary target.Operations and resultsAppraisal well 25/8-12 S was spudded with the semi-submersible installation "Mærsk Jutlander" on 29 May 1999 and drilled to TD at 2096 m in the Triassic Smith Bank Formation. The well was drilled with sea water down to 990 m and with oil based mud ("Environment") from 990 m to TD. Top Hermod sands were encountered at 1785.1 m. They consisted of an upper thin sand and a lower massive sand. Several pressure points within the sands confirm a water gradient in the main sand (1790-1803 m). Elevated resistivity indicates hydrocarbons in the interval from 1787-1789 m (1756 - 1758 m TVD SS). Top Statfjord Formation was found at 1905.9 m. MDT data and other open-hole wireline data confirm oil down to (ODT) 1947 m (1914 m TVD SS), and water up to (WUT) 1959 m (1926 m TVD SS). This is consistent with the OWC of 1917.5 m TVD SS established in the 25/8-11 where it was penetrated within a massive sand. Seven MDT oil samples were collected at 1923 m, within the main Jurassic sand reservoir. Pressure was 187.5 bars and temperature (measured, not static) ranged from 80.2 deg C to 80.5 deg C during the sampling. One core was cut from 1905 m to 1941 m in the Statfjord Formation. Well 25/8-12 S was permanently plugged back to the 9 5/8" casing at 984 m on June 8 1999 for sidetrack 25/8-12 A. It is classified 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]1000.002096.00 -
Borekjerner i Sokkeldirektoratet
Borekjerner i Sokkeldirektoratet Kjerneprøve nummerKjerneprøve - topp dybdeKjerneprøve - bunn dybdeKjerneprøve dybde - enhet11905.01938.8[m ]Borekjerner i Sokkeldirektoratet Total kjerneprøve lengde [m]33.8Borekjerner i Sokkeldirektoratet Kjerner tilgjengelig for prøvetaking?YES -
Kjernebilder
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Palynologiske preparater i Sokkeldirektoratet
Palynologiske preparater i Sokkeldirektoratet Prøve dybdeDybde enhetPrøve typeLaboratorie1905.0[m]DCRRI1912.0[m]DCRRI1943.0[m]DCRRI1955.0[m]DCRRI1979.0[m]DCRRI1990.0[m]DCRRI2010.0[m]DCRRI2030.0[m]DCRRI2050.0[m]DCRRI -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet150560672728728954115011591699169917661785178817891802183918801884190620402040 -
Spleisede logger
Spleisede logger Dokument navnDokument formatDokumentstørrelse [MB]pdf0.38 -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]AITH IPLT DSI9862099CMR GR16902040MDT GR00MWD LWD - DIR153213MWD LWD - DIR EWR-4 DGR213990MWD LWD - DIR EWR-4 DGR9902096VSP5052080 -
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 formasjonstestCONDUCTOR30211.036213.00.00LOTINTERM.9 5/8984.012 1/4990.00.00LOTOPEN HOLE2096.08 1/22096.01.62LOT -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling8601.3330.0OIL (ENVIRON)13851.3228.0OIL (ENVIRON)19051.3231.0OIL (REGULAR)20961.3225.0OIL (ENVIRON) -
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]pdf0.20