34/7-17 A
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Generell informasjon
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Brønnhistorie
GeneralWell 34/7-17 A is a sidetrack to well 34/7-17 on the Vigdis Field on Tampen Spur in the Northern North Sea. In well 34/7-17 the primary target Brent reservoir was encountered 38 m deeper than prognosed and dry with only scattered oil shows. The 34/7-17 A sidetracked well thus aimed primarily at the Brent reservoir in an up-dip position above a possible OWC. According to prognosis Brent should be truncated in this direction. A secondary objective was to test the pressure regimes in the Jurassic sequence, including possible depletion associated with pressure communication, previously identified in the nearby Tordis Field.Operations and resultsWell 34/7-17 A was spudded with the semi-submersible installation Treasure Saga on 7 April 1991. Kick off point was at 1994 m below the 13 3/8? casing shoe in well 34/7-17, in the top of the Shetland Group. The target was located up-dip in a south-easterly direction and the sidetrack was drilled deviated from its beginning. The well was drilled without significant technical problems to TD at 2650 m (2557 m TVD) in the Middle Jurassic Etive Formation of the Brent Group. It was drilled with KCl mud from kick off to TD.Top Brent Group, Tarbert Formation, was penetrated at 2494.5 m (2439.5 m TVD). Truncation was confirmed by the absence of the Viking Group and erosion into the top of the Brent Group. The Brent Group proved to be oil bearing only in the uppermost 6.5 m TVD with a possible OWC at 2502.5 m (2446 m TVD / 2420 m MSL TVD). Above the reservoir ditch cuttings recorded a continuous sequence with good traces of oil shows between 2235 and Top Brent Group. The interval 2310 to 2370 m also had oil staining and a strong odour of hydrocarbons. No shows were reported below 2506 m.One core was cut in the top of the reservoir between 2597 and 2617. Totally 21 m was cut, of which 20 m was recovered.Two RFT runs were conducted over the Brent Group. The resulting pressure gradients showed the Tarbert Formation to be under-pressured by 5.1 bar compared to the underlying Formations of the Brent Group with transitional pressures in the Ness Formation. Two RFT segregated samples were recovered from 2495.5 and 2495.7 m in the top of the Tarbert Formation. Both contained mud and water with a film of oil.The well was permanently abandoned on 4 May 1991 as an oil appraisal.TestingOne well test was carried out in the top of the Brent Group over the interval 2495 to 2499 m. The test was performed with variable, increasing choke sizes and it produced fluids with increasing water cut. At the end of the test a total liquid flow rate of 700 Sm3/day through a 15.9 mm choke was recorded at a well head pressure of 49 bar. The water cut at this end was 70%, the separator GOR was 115 Sm3/Sm3, the dead oil density was 0.850 g/cm3, and the gas gravity was 0.8 (air = 1). The maximum bottom hole -
Borekaks i Sokkeldirektoratet
Borekaks i Sokkeldirektoratet Borekaks tilgjengelig for prøvetaking?YESBorekaks i Sokkeldirektoratet Borekaksprøve, topp dybde [m]Borekaksprøve, bunn dybde [m]1995.002649.00 -
Borekjerner i Sokkeldirektoratet
Borekjerner i Sokkeldirektoratet Kjerneprøve nummerKjerneprøve - topp dybdeKjerneprøve - bunn dybdeKjerneprøve dybde - enhet12497.02517.0[m ]Borekjerner i Sokkeldirektoratet Total kjerneprøve lengde [m]20.0Borekjerner i Sokkeldirektoratet Kjerner tilgjengelig for prøvetaking?YES -
Oljeprøver i Sokkeldirektoratet
Oljeprøver i Sokkeldirektoratet Test typeFlaske nummerTopp dyp
MD [m]Bunn dyp
MD [m]Væske typeTest tidspunktPrøver tilgjengeligDSTDST12495.002499.00YES -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet2851050107012571331140314231699169917701924192421262483248324872495249525212572 -
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]pdf0.38pdf0.15 -
Borestrengtester (DST)
Borestrengtester (DST) Test nummerFra dybde MD
[m]Til dybde MD
[m]Reduksjonsventil størrelse
[mm]1.02495249915.6Borestrengtester (DST) Test nummerEndelig avstengningstrykk
[MPa]Endelig strømningstrykk
[MPa]Bunnhullstrykk
[MPa]Borehullstemperatur
[°C]1.05.00025.00091Borestrengtester (DST) Test nummerOlje produksjon
[Sm3/dag]Gass produksjon
[Sm3/dag]Oljetetthet
[g/cm3]Gasstyngde rel. luftGOR
[m3/m3]1.0719360000.8500.80050 -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]DITE MSFL SDT GR SP19532647LDL CNL GR19532650MWD GRD - GR RES DIR19942650RFT GR24952614SHDT GR19532651 -
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 formasjonstestINTERM.9 5/82633.012 1/42650.00.00LOT -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling24601.6527.015.0WATER BASED10.04.199124601.6528.019.0WATER BASED10.04.199124601.6528.019.0WATER BASED11.04.199124601.6528.019.0WATER BASED15.04.199124601.6528.019.0WATER BASED17.04.199124601.6528.019.0WATER BASED12.04.199124931.7033.021.0WATER BASED17.04.199124931.7035.022.0WATER BASED23.04.199124931.7033.019.0WATER BASED29.04.199124931.7034.018.0WATER BASED30.04.199124931.7034.018.0WATER BASED03.05.199124931.7033.019.0WATER BASED06.05.199124931.7036.018.0WATER BASED17.04.199124931.7032.021.0WATER BASED17.04.199124931.7033.021.0WATER BASED18.04.199124931.7033.021.0WATER BASED19.04.199124931.7032.021.0WATER BASED23.04.199124931.7033.021.0WATER BASED23.04.199124931.7035.019.0WATER BASED25.04.199124931.7036.019.0WATER BASED25.04.199124931.7036.019.0WATER BASED26.04.199124931.7036.015.0WATER BASED30.04.199124931.7033.019.0WATER BASED30.04.199124931.7033.019.0WATER BASED02.05.199124931.70WATER BASED03.05.199124931.70WATER BASED03.05.199124931.7036.015.0WATER BASED03.05.199124931.7036.015.0WATER BASED03.05.199124931.7034.018.0WATER BASED03.05.199124931.7034.018.0WATER BASED03.05.199124931.7033.019.0WATER BASED03.05.199124931.7034.018.0WATER BASED06.05.1991 -
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