15/3-5
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Generell informasjon
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Brønnhistorie
GeneralWell 15/3-5 was drilled on the Gudrun Terrace, east of the 15/3-1 S Gudrun Discovery in the North Sea. Well 15/3-5 was drilled in a downdip position of a structure explored by the well 15/3-4, where oil bearing reservoirs of Middle Jurassic age were tested. The main objectives of 15/3-5 were to find the extension of these reservoirs and to define a hydrocarbon/water contact.Operations and resultsAppraisal well 15/3-5 was spudded with the semi-submersible installation Byford Dolphin on 28 December 1983 and drilled to TD at 4130 m in the Middle Jurassic Sleipner Formation. Drilling was suspended at 195 m due to bad weather. The well was re-spudded on 6 January 25 m west of the original location. Some technical problems with the BOP occurred after setting of the 20" and 13 3/8" casings. A seat protector got stuck in the riser during drilling of the 17 1/2" hole. Drilling breaks occurred at 3943 m, 3954 m, 4018 m, 4032 m and at 4041 4043 m in the 8 1/2" hole section. The well was drilled using water based mud.Top Draupne Formation was encountered at 3808 m, followed by the Heather Formation at 3881 m, and the target Middle Jurassic Sleipner Formation at 3935 m. Several thin reservoir zones were penetrated in the Sleipner Formation. The sands were interpreted as minor fluvial channels (2 to 5m in thickness) deposited in two main sequences. Four of the channels were oil-bearing with an oil gradient of 0.61 bar/10 m based on pressure measurements. An OWC could be established at 4022.6 m. Pressure measurements showed that the upper fluvial channel sequence is over-pressured, and not in contact with the sands encountered in well 15/3-4. The lower fluvial sequence could be connected between the two wells. Petrophysical evaluation of the whole system gave a net pay of 6.7 m.In the Quaternary, Tertiary and Cretaceous series no fluorescence due to hydrocarbons were observed. In the Upper Jurassic sequence, a weak yellow colour in direct fluorescence light was observed on sandstone pieces. A pale to clear yellow and orange colour in direct fluorescence light was reported from the Middle Jurassic sequence down to about 4060m. Below 4060 m to TD nil to very weak direct fluorescence was observed.Three cores were cut in the Sleipner Formation. Cores 1 and 2 were cut from 3971 to 4003 m (3973.6 to 4005.6 m logger's depth) with 98 % and 84% recovery, respectively. Core 3 was cut from 4020 to 4029 m (4023.9 to 4032.9 m logger's depth) with 94% recovery. RFT wire line fluid samples were taken at 3969.9 m (gas + mud filtrate), 3984 m (gas + mud filtrate), 4022.2 m (minor gas + mud filtrate), and 4028.5 m (trace gas + mud filtrate),The well was permanently abandoned on 13 May 1984 as an oil appraisal.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]200.004130.00 -
Kjernebilder
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Oljeprøver i Sokkeldirektoratet
Oljeprøver i Sokkeldirektoratet Test typeFlaske nummerTopp dyp
MD [m]Bunn dyp
MD [m]Væske typeTest tidspunktPrøver tilgjengeligDST0.000.00WATERYES -
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 formasjonstestCONDUCTOR30196.036196.00.00LOTSURF.COND.20962.026977.01.28LOTINTERM.13 3/82798.017 1/22813.01.72LOTINTERM.9 5/83816.012 1/43832.00.00LOTOPEN HOLE4130.08 1/24130.00.00LOT -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]BGT GR CAL9622800CST28173829CST32103828CST38303905CST39384130DLL MSFL GR38164133ISF LSS GR SP27973832ISF LSS GR SP38164005ISF LSS GR SP38164133ISF SON GR135973ISF SON GR SP9622808LDL CAL9622808LDL CNL GR CAL38164005LDL CNL NGL38154135LDT GR CAL194967LDT NGT CAL27973817RFT39604135RFT39844048RFT40224028SHDT27973830SHDT38154135SSL10004125 -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet135702928112915962236223622942350269527572803280330633401348636233623367238083808388139353935 -
Geokjemisk informasjon
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Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk)
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk) Dokument navnDokument formatDokument størrelse [KB]pdf2.17pdf11.39 -
Dokumenter – eldre Sokkeldirektoratets WDSS rapporter og andre relaterte dokumenter
Dokumenter – eldre Sokkeldirektoratets WDSS rapporter og andre relaterte dokumenter Dokument navnDokument formatDokument størrelse [KB]pdf0.16pdf0.34 -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling1801.0326.010.0WATER BASED2101.1126.010.0WATER BASED10401.1515.010.0WATER BASED11701.17WATER BASED12451.1825.020.0WATER BASED15301.1924.014.0WATER BASED17901.2121.013.0WATER BASED21601.26WATER BASED23701.2632.026.0WATER BASED26051.2821.016.0WATER BASED30101.2935.028.0WATER BASED30701.3035.026.0WATER BASED35301.3336.024.0WATER BASED36601.3736.020.0WATER BASED37101.4148.020.0WATER BASED37401.4348.020.0WATER BASED37851.4540.026.0WATER BASED38501.60WATER BASED39301.6142.018.0WATER BASED39701.70WATER BASED -
Palynologiske preparater i Sokkeldirektoratet
Palynologiske preparater i Sokkeldirektoratet Prøve dybdeDybde enhetPrøve typeLaboratorie3971.4[m]CWESTL3973.5[m]CWESTL3977.1[m]CWESTL3979.6[m]CWESTL3980.7[m]CWESTL3983.4[m]CWESTL3986.4[m]CWESTL3987.2[m]CWESTL3992.0[m]CWESTL3995.8[m]CWESTL4000.4[m]CWESTL4020.3[m]CWESTL4021.4[m]CWESTL4023.1[m]CWESTL4024.2[m]CWESTL4028.3[m]CWESTL