25/2-12
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Generell informasjon
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Brønnhistorie
GeneralWell 25/2-12 was the second hole drilled on an NNESSV-oriented structural height in the northwestern part of the block. Well 25/2-4, which was drilled in 1975 in a more down flank position, found a 21 m gas column and a 48 m oil column in the Vestland Group. The Statfjord Formation was water bearing in 25/2-4, but its position was not optimal on the structure with regards to the Jurassic prospects.The main objective of well 25/2-12 was to examine the Statfjord Formation higher up on the structure than 25/4-2, including getting more information about the oil and gas discovery in the Vestland Group.Operations and resultsAppraisal well 25/2-12 was spudded 17 July 1988 by Smedvig semi-submersible rig West Vanguard and completed 13 November 1988 at a depth of 4103 m in the Late Jurassic Statfjord Formation. A 17 1/2" pilot hole was drilled from 197- 907 m and then opened to 26". Sand layers were encountered at 214 m and 259 m RKB, and MWD measurements showed no indication of shallow gas. Drilling proceeded without any significant problems down to 1366 m where metamorphic gravel plugged the bit so that it had to be changed. During clean-up of the hole, mud was lost to the sand formation at 890 m to 1000 m. "Lost circulation material" (LCM) was pumped into the well to isolate it. The well was in periods unstable.The Frigg Formation was water bearing. The gas readings were at times very high (up to 80 %). There was danger of losing the mud in Turonian limestone. Some fractures were observed higher up in the section. There were traces of gas in the limestone. Top Vestland Group came in at 3685.5 m, 112 m deeper than prognosed. The reason for this was assumed to be that the top of the Vestland Group had been faulted. The fluid contact was set to 3701 m. Analysis of this showed that it was a condensate column of 15 m. A total of five cores were cut. Core 1 was a "junk core". Cores 2 & 3 were cut in the Vestland Group and core 4 in the Dunlin Group. Core 4 was for geochemical studies. Core 5 was cut in the Statfjord Formation. RFT fluid sampling at 3697.2 m gave recovered 3.5 l mud filtrate, 1.1 l condensate/oil, and 1.8 Sm3 gas.When the Statfjord Formation was found water bearing, the NPD permitted EAN to change TD from 4225 m (Triassic) to 4100 m (113 m into the Statfjord Formation). It was plugged and abandoned as a gas/condensate appraisal.TestingOne DST test was attempted in the interval 3685.5 m to 3690.5 m, but had to be stopped due to large sand production. -
Borekaks i Sokkeldirektoratet
Borekaks i Sokkeldirektoratet Borekaks tilgjengelig for prøvetaking?YESBorekaks i Sokkeldirektoratet Borekaksprøve, topp dybde [m]Borekaksprøve, bunn dybde [m]910.004100.00 -
Borekjerner i Sokkeldirektoratet
Borekjerner i Sokkeldirektoratet Kjerneprøve nummerKjerneprøve - topp dybdeKjerneprøve - bunn dybdeKjerneprøve dybde - enhet23685.03686.1[m ]33690.03715.4[m ]43943.03952.2[m ]53994.04019.0[m ]Borekjerner i Sokkeldirektoratet Total kjerneprøve lengde [m]60.7Borekjerner i Sokkeldirektoratet Kjerner tilgjengelig for prøvetaking?YES -
Kjernebilder
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Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet13741610201073111012101255142714402042216921692182228623002350241924922580262226222850333335503572360636063614361436343686368637133800380038763990 -
Spleisede logger
Spleisede logger Dokument navnDokument formatDokumentstørrelse [MB]pdf0.60 -
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]pdf0.24pdf0.28 -
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk)
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk) Dokument navnDokument formatDokumentstørrelse [MB]pdf32.58 -
Borestrengtester (DST)
Borestrengtester (DST) Test nummerFra dybde MD
[m]Til dybde MD
[m]Reduksjonsventil størrelse
[mm]1.0368636910.0Borestrengtester (DST) Test nummerEndelig avstengningstrykk
[MPa]Endelig strømningstrykk
[MPa]Bunnhullstrykk
[MPa]Borehullstemperatur
[°C]1.0Borestrengtester (DST) Test nummerOlje produksjon
[Sm3/dag]Gass produksjon
[Sm3/dag]Oljetetthet
[g/cm3]Gasstyngde rel. luftGOR
[m3/m3]1.0 -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]CBL VDL GR6483780CST GR10212469DIL SLS GR SP8804101DLL MSFL GR35933818FMS GR34124013LDL CNL NGT GR34154103LDL GR8903383MWD1994090RFT GR36873797VSP1993800 -
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 formasjonstestCONDUCTOR30197.036199.00.00LOTSURF.COND.20890.026912.01.25LOTINTERM.13 3/82848.017 1/22879.01.88LOTINTERM.9 5/83412.012 1/43512.02.05LOTLINER74102.08 1/24102.00.00LOT -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling11951.1243.016.6WATER BASED27.07.198813551.1435.014.2WATER BASED28.07.198813671.1332.010.7WATER BASED29.07.198815081.1433.010.7WATER BASED01.08.198817071.1735.012.7WATER BASED01.08.198819931.2030.09.8WATER BASED10.08.198820541.1929.012.2WATER BASED11.08.198821341.1934.013.7WATER BASED12.08.198821341.1930.010.7WATER BASED15.08.198822961.1930.010.7WATER BASED15.08.198824271.1932.012.7WATER BASED15.08.198824531.2232.012.2WATER BASED16.08.198825721.2228.011.7WATER BASED19.08.198825941.2223.010.7WATER BASED19.08.198825991.2428.09.3WATER BASED22.08.198826071.2427.010.7WATER BASED22.08.198826291.2426.010.7WATER BASED23.08.198826511.2424.010.7WATER BASED24.08.198826881.2425.09.8WATER BASED25.08.198827361.2424.011.7WATER BASED26.08.198827671.2427.012.7WATER BASED29.08.198827951.2435.012.7WATER BASED30.08.198828631.2634.013.7WATER BASED31.08.198828671.2836.011.7WATER BASED02.09.198828671.3023.010.7WATER BASED05.09.198828791.5034.09.3WATER BASED14.09.198829361.5335.09.8WATER BASED15.09.198829581.5334.09.3WATER BASED16.09.198830211.5336.013.7WATER BASED19.09.198831571.6636.010.2WATER BASED19.09.198832211.7437.09.8WATER BASED20.09.198832811.7933.09.8WATER BASED21.09.198833251.8535.09.8WATER BASED22.09.198833691.8536.09.8WATER BASED26.09.198833921.8533.09.8WATER BASED26.09.198838031.9249.011.7WATER BASED14.10.198839101.9253.013.7WATER BASED20.10.198839481.9258.013.7WATER BASED24.10.198839821.9252.010.7WATER BASED24.10.198840081.9253.013.7WATER BASED24.10.198840521.9250.013.7WATER BASED24.10.1988 -
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]pdf0.22