25/2-10 S
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Generell informasjon
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Brønnhistorie
GeneralWell 25/2-10 S was designed to drill the Gamma Structure, one of the Frigg satellites, east of the East Frigg Beta Structure. The primary objective of the well was to test whether the gamma structure is an eastward extension of the East Frigg Beta structure. The main target was the Lower Eocene Frigg Formation; secondary targets were the Balder and Ekofisk Formations. In addition a possible gas accumulation was expected in a thin sand body of late Oligocene age.Shallow gas indications at 256 m MSL, and a disturbed zone on the seismic from seabed to the Frigg Formation demanded a deviated well in order to reach the Frigg Formation at its highest structural position.Operations and resultsWildcat well 25/2-10 S was spudded 2 December 1985 by Sonat Offshore A/S semi-submersible rig Henry Goodrich. The well terminated in Limestone of the Early Paleocene Ekofisk Formation at a depth of 2967 m (2643 m TVD RKB).Due to shallow gas indication on the chosen locality, the well was spudded 1100 m north and 200 m east of the TD position. Drilling proceeded without significant problems down to 1049 m here mud was lost.An Oligocene sand, now re-dataed to be of Lower Miocene age, was confirmed in the interval 1115 m to 1148.5 m (1006.5 m to 1031 m TVD RKB) with gas from top sand at 1115 m down to a GOW at 1136.5 m (1006.5 m to 1022.5 m TVD RKB). From 1095 m to 1150 m (992 m to 1030 m TVD RKB) strong yellowish green to yellow ocher direct fluorescence and milky yellow cut were observed on cuttings and SWC. Pressure measurements suggest an oil gradient of ca 0.72 g/cc below the gas with a tentative OWC at 1162 m (1041.5 m TVD RKB). Top Frigg Formation came in at 2230 m (1943 m TVD RKB) with minor amounts of oil and gas. The GOC in the Frigg reservoir was found at 2243.6 m (1956 m TVD RKB) and the OWC at 2259.6 m (1971 m TVD RKB). Brown oil staining was reported on the cores from 2243.5 m to 2257 m. In the Frigg Formation, direct fluorescence shows were reported from 2230 m to 2280 m. No fluorescence was observed below 2280 m. The average reservoir temperatures were estimated to 30.6deg C in the Lower Miocene reservoir and 58.0deg C in the Frigg reservoir.Five cores were cut in the interval 2236 m to 2275 m. Two cores were cut down to 2311 m, and altogether 9 cores were cut in this well. Wire line RFT samples were taken in Lower Miocene at 1129 m (gas) and in the Frigg Formation at 2234.6 m (gas and mud filtrate), and at 2252.5 m (oil and mud filtrate). Testing of the two hydrocarbon bearing zones was not carried out as the NPD consent for use of the rig was withdrawn. During abandonment operation the BOP was lost 8 m above wellhead and caused severe damage such that the well was lost. The well was suspended 19 March 1986 as an oil and gas discovery.The well was re-entered (25/2-10 SR) with the semi-submersible installation Nortrym on 16 September 1987. The only operations performed in the re-entry were plugging and permanent abandonment. The well was completed 22 September 1987 as an oil and gas discovery.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]210.002967.00 -
Borekjerner i Sokkeldirektoratet
Borekjerner i Sokkeldirektoratet Kjerneprøve nummerKjerneprøve - topp dybdeKjerneprøve - bunn dybdeKjerneprøve dybde - enhet12237.02245.0[m ]32246.02246.9[m ]42247.62256.8[m ]52257.02269.2[m ]82582.02597.0[m ]92888.02892.0[m ]Borekjerner i Sokkeldirektoratet Total kjerneprøve lengde [m]49.3Borekjerner i Sokkeldirektoratet Kjerner tilgjengelig for prøvetaking?YES -
Kjernebilder
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Oljeprøver i Sokkeldirektoratet
Oljeprøver i Sokkeldirektoratet Test typeFlaske nummerTopp dyp
MD [m]Bunn dyp
MD [m]Væske typeTest tidspunktPrøver tilgjengeligRFTRFT-52252.000.0014.02.1986 - 00:00YES -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet1414755206306301088111511481245126417321740223025012501257926482661269527392811291229392939 -
Spleisede logger
Spleisede logger Dokument navnDokument formatDokumentstørrelse [MB]pdf0.58 -
Geokjemisk informasjon
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Dokumenter – eldre Sokkeldirektoratets WDSS rapporter og andre relaterte dokumenter
Dokumenter – eldre Sokkeldirektoratets WDSS rapporter og andre relaterte dokumenter Dokument navnDokument formatDokumentstørrelse [MB]pdf0.36pdf0.23 -
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk)
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk) Dokument navnDokument formatDokumentstørrelse [MB]pdf5.94 -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]BGT9451428BHC GR9471143CBL VDL CCL GR19502034CBL VDL GR1401830CST GR8482034DIL LSS GR2022642DLL MSFL GR9482126LDT CNL9472642LDT GR202956MWD2202967NGT9472642SHDT GR18372640 -
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 formasjonstestCONDUCTOR30202.036202.00.00LOTINTERM.20616.026626.00.00LOTINTERM.13 3/81032.017 1/21045.00.00LOTINTERM.9 5/82115.012 1/42129.00.00LOTLINER72967.08 1/22967.00.00LOT -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling1661.0735.065.0WATER BASED04.12.19852021.0735.065.0WATER BASED05.12.19852201.0515.010.0WATER BASED10.12.19854281.0815.05.0WATER BASED10.12.19854561.0710.020.0WATER BASED10.12.19856261.0720.029.0WATER BASED10.12.19856261.0820.014.0WATER BASED10.12.19856261.1520.014.0WATER BASED11.12.19856261.1520.014.0WATER BASED12.12.19856261.1520.0WATER BASED16.12.19856261.04WATER BASED17.12.19856261.04WATER BASED18.12.19856261.0720.013.0WATER BASED23.12.19856261.0828.020.0WATER BASED10.12.19856311.0620.013.0WATER BASED23.12.19858171.0829.017.0WATER BASED23.12.19859561.0915.023.0WATER BASED23.12.198510371.0712.025.0WATER BASED24.12.198510451.0724.017.0WATER BASED24.12.198510451.0722.012.0WATER BASED24.12.198510451.0620.020.0WATER BASED24.12.198510451.0617.08.0WATER BASED30.12.198510451.1222.011.0WATER BASED30.12.198510451.0716.015.0WATER BASED30.12.198510491.1216.013.5WATER BASED30.12.198510491.1216.027.0WATER BASED30.12.198510491.12160.0270.0WATER BASED30.12.198510751.1330.011.0WATER BASED01.01.198611001.1329.010.0WATER BASED02.01.198611001.1229.010.0WATER BASED06.01.198611001.1329.010.0WATER BASED01.01.198613481.1434.013.0WATER BASED06.01.198614591.1530.09.0WATER BASED06.01.198615461.1636.012.0WATER BASED07.01.198617171.1734.013.0WATER BASED03.01.198617911.1830.010.0WATER BASED09.01.198618661.1732.012.0WATER BASED13.01.198618661.1835.013.0WATER BASED13.01.198620151.2038.016.0WATER BASED13.01.198621291.2440.014.0WATER BASED16.01.198621291.2640.014.0WATER BASED17.01.198621291.2443.014.0WATER BASED14.01.198621291.2640.014.0WATER BASED20.01.198621291.2640.015.0WATER BASED20.01.198621331.0728.05.0WATER BASED23.01.198622331.0926.08.0WATER BASED25.01.198622361.0926.010.0WATER BASED25.01.198622461.0925.05.0WATER BASED25.01.198622481.1025.05.0WATER BASED25.01.198622571.1226.05.0WATER BASED25.01.198623111.1124.05.0WATER BASED30.01.198623711.1126.07.5WATER BASED31.01.198623711.1126.02.5WATER BASED03.02.198624271.1231.06.5WATER BASED03.02.198625551.1227.08.0WATER BASED03.02.198625821.1228.09.0WATER BASED01.02.198626001.1232.010.0WATER BASED04.02.198627481.1129.09.0WATER BASED06.02.198628561.1228.010.7WATER BASED11.02.198628851.1230.08.8WATER BASED11.02.198629251.1329.08.8WATER BASED11.02.198629551.1128.09.8WATER BASED11.02.198629671.1130.09.8WATER BASED11.02.1986 -
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]pdf0.23