34/7-4
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Generell informasjon
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Brønnhistorie
GeneralWell 34/7-4 was drilled on the Snorre E structure in the northern part of block 34/7. The primary objectives were to further appraise the reservoir potential of the Statfjord Formation in the E-structure extension of the Snorre Discovery, to test the oil/water contact found in wells 34/7-1, and to test the reservoir quality in this area. A secondary objective was to test the reservoir potential in the upper Lunde Formation, which contain oil in an up-dip location.Operations and resultsAppraisal well 34/7-4 was spudded with the semi-submersible installation Treasure Saga on 19 November 1984 and drilled to TD at 3115 m in the Late Triassic Lunde Formation. No significant problems occurred during drilling of the well. The well was drilled with spud mud down to 963 m, with gypsum/polymer mud from 963 m to 2759 m, and with lignosulphonate mud from 2759 m to TD.Except for the sandy Utsira Formation (Late Miocene/Pliocene) and an Early Eocene sandstone unit (1625-1664 m) in the lower part of the Hordaland Group, the well proved mainly claystones down to the Early Jurassic Statfjord Formation at 2535.5 m. The Statfjord Formation was 92 m thick and was oil bearing down to claystones in top Lunde Formation at 2627.5 m. No definite oil-water contact was seen. The N/G ratio in the Statfjord Formation was 0.26. The average porosity was 20 % and the average water saturation was 44%. The Lunde Formation proved mainly a claystone/siltstone sequence in the upper part, while the lowermost 265 m proved a sequence of alternating sandstones and claystones with limestone stringers. Of this sequence some 123 m can be considered as net. The Lunde Formation reservoir was water bearing.Three cores totalling 24.6 m (recovered 22.3 m. 91% recovery) were cut in the Statfjord Formation from 2533 m to 2557.5 m. Core depths were from 2.0 to 4.0 m short of logger's depth. Another two cores were attempted at 2558.5 m and 2559 m, but these gave no recovery. Two FMT-chambers containing reservoir fluid were collected in the Statfjord Formation at 2537 m and 2555 m. These samples proved not to be representative, since the bubble point pressures were too low.The well was permanently abandoned on 16 January 1985 as an oil appraisal.TestingOne drill stem test was carried out in the interval 2547.0 - 2563.0 m in the Statfjord Formation. The zone produced clean oil at a rate of 865 Sm3 /day through a 9.5 mm choke with a wellhead pressure of 130 bar. The reservoir pressure was 386.5 bar and the temperature 91deg C at 2555.0 m. The formation permeability was estimated to 1330 mD and no heterogeneities were observed during the test.The separator GOR was 34 Sm3/Sm3 and the dead oil density was 0.843 g/cc with a Formation Volume Factor of 1.27.> -
Borekaks i Sokkeldirektoratet
Borekaks i Sokkeldirektoratet Borekaks tilgjengelig for prøvetaking?YESBorekaks i Sokkeldirektoratet Borekaksprøve, topp dybde [m]Borekaksprøve, bunn dybde [m]490.003116.00 -
Borekjerner i Sokkeldirektoratet
Borekjerner i Sokkeldirektoratet Kjerneprøve nummerKjerneprøve - topp dybdeKjerneprøve - bunn dybdeKjerneprøve dybde - enhet12533.02536.7[m ]22537.52552.5[m ]32552.52557.6[m ]Borekjerner i Sokkeldirektoratet Total kjerneprøve lengde [m]23.8Borekjerner i Sokkeldirektoratet Kjerner tilgjengelig for prøvetaking?YES -
Kjernebilder
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Palynologiske preparater i Sokkeldirektoratet
Palynologiske preparater i Sokkeldirektoratet Prøve dybdeDybde enhetPrøve typeLaboratorie1190.0[m]DCRRI1210.0[m]DCRRI1220.0[m]DCRRI1240.0[m]DCRRI1260.0[m]DCRRI1270.0[m]DCRRI1280.0[m]DCRRI1290.0[m]DCRRI1310.0[m]DCRRI1330.0[m]DCRRI1850.0[m]DCRRI1865.0[m]DCRRI1880.0[m]DCRRI1895.0[m]DCRRI1910.0[m]DCRRI -
Oljeprøver i Sokkeldirektoratet
Oljeprøver i Sokkeldirektoratet Test typeFlaske nummerTopp dyp
MD [m]Bunn dyp
MD [m]Væske typeTest tidspunktPrøver tilgjengeligDST2563.002547.00YESDSTDST10.000.00YES -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet345111811871625167516851685171218481848199824962496250425172517253626282628 -
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]pdf0.29pdf0.25 -
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk)
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk) Dokument navnDokument formatDokumentstørrelse [MB]pdf1.78pdf37.52 -
Borestrengtester (DST)
Borestrengtester (DST) Test nummerFra dybde MD
[m]Til dybde MD
[m]Reduksjonsventil størrelse
[mm]1.0254725639.5Borestrengtester (DST) Test nummerEndelig avstengningstrykk
[MPa]Endelig strømningstrykk
[MPa]Bunnhullstrykk
[MPa]Borehullstemperatur
[°C]1.0192.000131.000385.000Borestrengtester (DST) Test nummerOlje produksjon
[Sm3/dag]Gass produksjon
[Sm3/dag]Oljetetthet
[g/cm3]Gasstyngde rel. luftGOR
[m3/m3]1.0865350000.8330.74033 -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]CALIPER9531229CDL CN GR19152755CDL CN GR27443073COREGUN00COREGUN00DIELECTRIC24502748DIFL LSBHC9531930DIFL LSBHC GR469970DIFL LSBHC GR19152758DIFL LSBHC GR27443118DIPLOG19152750DIPLOG27443117DLL MLL GR24502757FMT19152750FMT27443117GR120473SPECTRALOG19152750SPECTRALOG27443068VSP3183118 -
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 formasjonstestCONDUCTOR30469.036473.00.00LOTSURF.COND.20953.026971.01.51LOTINTERM.13 3/81015.017 1/21930.01.78LOTINTERM.13 3/81915.017 1/21930.01.90LOTINTERM.13 3/81915.017 1/21930.01.78LOTINTERM.9 5/82745.012 1/42756.01.90LOTINTERM.9 5/82745.012 1/42756.00.00LOTOPEN HOLE3115.08 1/23115.00.00LOTOPEN HOLE3115.08 1/23115.00.00LOT -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling4081.03100.0WATER BASED21.11.19844731.03100.0WATER BASED21.11.19847021.1062.057.0WATER BASED23.11.19849711.1556.049.0WATER BASED26.11.19849711.2256.056.0WATER BASED26.11.19849711.2259.056.0WATER BASED26.11.19849711.2253.050.0WATER BASED27.11.19849711.2252.048.0WATER BASED27.11.19849711.0754.016.0WATER BASED30.11.19849711.0754.016.0WATER BASED03.12.19849711.2256.056.0WATER BASED26.11.19849711.2259.056.0WATER BASED26.11.19849711.2253.050.0WATER BASED27.11.19849711.2252.048.0WATER BASED27.11.19849711.0754.016.0WATER BASED30.11.19849711.0754.016.0WATER BASED03.12.198411171.1448.018.0WATER BASED11.12.198415521.2748.018.0WATER BASED11.12.198416521.3248.018.0WATER BASED11.12.198419031.3748.018.0WATER BASED12.12.198419301.4426.019.0WATER BASED13.12.198419301.4422.020.0WATER BASED17.12.198419301.4422.020.0WATER BASED17.12.198420721.4433.017.0WATER BASED17.12.198422861.5622.015.0WATER BASED17.12.198423811.6024.018.0WATER BASED18.12.198424981.6950.018.0WATER BASED20.12.198425371.6950.016.0WATER BASED20.12.198425591.6947.013.0WATER BASED27.12.198425591.6949.014.0WATER BASED27.12.198425591.6949.014.0WATER BASED27.12.198425831.6951.015.0WATER BASED06.01.198526301.6948.014.0WATER BASED27.12.198426881.6949.015.0WATER BASED27.12.198427491.6950.016.0WATER BASED27.12.198428101.6050.018.0WATER BASED01.01.198529971.6050.018.0WATER BASED01.01.198531151.6048.013.0WATER BASED06.01.198531151.6049.018.0WATER BASED01.01.198531151.6048.013.0WATER BASED06.01.1985 -
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]pdf0.21