30/9-12
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Generell informasjon
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Brønnhistorie
GeneralThe well 30/9-12 is located on the southern part of the Alpha and Gamma structure in the Oseberg Sør area, some 4 km south of well 30/9-2, and approximately 100 m to the south of the licence boundary PL 079/104. The main target of the well was to appraise the southern extension of the Oseberg field, i.e. to improve the seismic mapping of the Alpha South/Gamma structural complex; to improve stratigraphical mapping and control of the hydrocarbon bearing Brent Group in the area; to test an oil/water contact in relation to the Oseberg Field and the C-structure; and to test communication relations in the Oseberg Field.Operations and resultsAppraisal well 30/9-12 was spudded with the semi-submersible installation Vildkat Explorer on the 7 April 1991 and drilled to TD at 2994 m in the Cook Formation of the Dunlin Group. The well was drilled with spud mud to 1016 m and with KCl polymer mud from 1016 m to TD. Shallow gas predicted at 184 m proved to be the base of a boulder zone, probably a glacially eroded horizon.The well proved a column of 10.3 m of moveable hydrocarbons oil in the Tarbert Formation with an oil down-to contact at 2674.5 m, However, as no oil/water contact was established, uncertainty remained as to the amount of hydrocarbon resources within the southern part of the Alpha South structure. A total of 70.4 m of net sand was calculated for the Brent sequence, with an average porosity of 21.5% and calculated average Sw of 26.1% in the Tarbert Formation.The pressure data obtained from the well indicated a significant depletion caused by production from Oseberg B.Good oil shows were recorded on cuttings from limestone stringers in the interval 2325 m to 2554 m in the Cretaceous and on sandstones (conventional and sidewall cores) in the interval 2658 m to 2673 m in the Tarbert Formation. A total of 10 conventional cores were cut, one in the Heather Formation and nine through the entire Brent sequence and into the top Dunlin. A total of 30 sidewall cores were attempted in the interval 2580 m to 2969.5 m. and 25 were recovered. One wire line RFT fluid sample was taken at 2667 m in the Tarbert Formation. It recovered 5 l of 0.87 g/cm3 oil and some gas.The well bore was plugged back to 950 m for sidetracking and permanently abandoned on 9 May 1991 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]1030.002992.00 -
Borekjerner i Sokkeldirektoratet
Borekjerner i Sokkeldirektoratet Kjerneprøve nummerKjerneprøve - topp dybdeKjerneprøve - bunn dybdeKjerneprøve dybde - enhet12617.02639.0[m ]22663.02691.0[m ]32691.02712.0[m ]42714.02726.0[m ]52726.02730.0[m ]62730.02734.0[m ]72734.02739.5[m ]82739.52753.0[m ]92758.52786.0[m ]102788.02804.2[m ]Borekjerner i Sokkeldirektoratet Total kjerneprøve lengde [m]153.7Borekjerner i Sokkeldirektoratet Kjerner tilgjengelig for prøvetaking?YES -
Kjernebilder
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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 formasjonstestCONDUCTOR30214.036216.00.00LOTINTERM.13 3/81002.017 1/21019.01.61LOTINTERM.9 5/82528.012 1/42545.01.69LOTOPEN HOLE2994.08 1/22994.00.00LOT -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]CBL VDL GR10002528CST25422969DIL LSS LDL CNL NGL24902993DIL LSS LDL SP GR10032543DLL MSFL LDL CNL GR24752800FMS4 GR CAL25272995MWD - GR RES DIR1282994RFT B HP GR26612780VSP11002570VSP25802990 -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet1296768429801012135013802019201920832247231723252325252325232543254525602563256326092660266026762752279127912944 -
Spleisede logger
Spleisede logger Dokument navnDokument formatDokumentstørrelse [MB]pdf0.40 -
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk)
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk) Dokument navnDokument formatDokumentstørrelse [MB]pdf11.92 -
Dokumenter – eldre Sokkeldirektoratets WDSS rapporter og andre relaterte dokumenter
Dokumenter – eldre Sokkeldirektoratets WDSS rapporter og andre relaterte dokumenter Dokument navnDokument formatDokumentstørrelse [MB]pdf0.85pdf0.19 -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling1821.22WATER BASED08.04.19912161.05WATER BASED09.04.19916101.05WATER BASED10.04.199110161.05WATER BASED11.04.199110161.20WATER BASED12.04.199110161.20WATER BASED15.04.199110611.2015.08.0WATER BASED15.04.199116751.4019.011.0WATER BASED15.04.199122761.4022.09.0WATER BASED17.04.199123021.4223.010.0WATER BASED17.04.199124001.2212.07.0WATER BASED08.05.199124001.2620.012.0WATER BASED10.05.199124051.4122.010.0WATER BASED18.04.199124641.3920.010.0WATER BASED19.04.199125451.3921.09.0WATER BASED22.04.199125451.4020.08.0WATER BASED22.04.199125451.4020.08.0WATER BASED22.04.199125451.4020.09.0WATER BASED23.04.199125481.4017.06.0WATER BASED25.04.199126221.2112.07.0WATER BASED25.04.199126641.2013.07.0WATER BASED26.04.199126911.2213.07.0WATER BASED30.04.199127041.2013.07.0WATER BASED30.04.199127271.2012.06.0WATER BASED30.04.199127381.2013.08.0WATER BASED30.04.199127591.2012.06.0WATER BASED02.05.199127881.2014.08.0WATER BASED02.05.199128051.2014.07.0WATER BASED03.05.199128051.2114.07.0WATER BASED06.05.199129941.2113.07.0WATER BASED06.05.199129941.2213.07.0WATER BASED07.05.199129941.2213.07.0WATER BASED06.05.1991 -
Palynologiske preparater i Sokkeldirektoratet
Palynologiske preparater i Sokkeldirektoratet Prøve dybdeDybde enhetPrøve typeLaboratorie1050.0[m]DCSTRAT1070.0[m]DCSTRAT1100.0[m]DCSTRAT1130.0[m]DCSTRAT1160.0[m]DCSTRAT1190.0[m]DCSTRAT1220.0[m]DCSTRAT1250.0[m]DCSTRAT1280.0[m]DCSTRAT1310.0[m]DCSTRAT1340.0[m]DCSTRAT1360.0[m]DCSTRAT1400.0[m]DCSTRAT1430.0[m]DCSTRAT1460.0[m]DCSTRAT1490.0[m]DCSTRAT1520.0[m]DCSTRAT1550.0[m]DCSTRAT1580.0[m]DCSTRAT1610.0[m]DCSTRAT1640.0[m]DCSTRAT1820.0[m]DCSTRAT1850.0[m]DCSTRAT1880.0[m]DCSTRAT1910.0[m]DCSTRAT1940.0[m]DCSTRAT1970.0[m]DCSTRAT2030.0[m]DCSTRAT2060.0[m]DCSTRAT2090.0[m]DCSTRAT2110.0[m]DCSTRAT2150.0[m]DCSTRAT2180.0[m]DCSTRAT2210.0[m]DCSTRAT2240.0[m]DCSTRAT2270.0[m]DCHYDRO2300.0[m]DCHYDRO2360.0[m]DCSTRAT2390.0[m]DCSTRAT2450.0[m]DCSTRAT2480.0[m]DCSTRAT2510.0[m]DCSTRAT2520.0[m]DCSTRAT2522.0[m]CHYDRO2530.0[m]DCSTRAT2542.5[m]SWCHYDRO2554.0[m]SWCHYDRO2560.0[m]SWCHYDRO2563.0[m]SWCHYDRO2566.0[m]SWCHYDRO2572.0[m]DCSTRAT2580.0[m]SWCHYDRO2591.0[m]SWCHYDRO2600.0[m]SWCHYDRO2605.0[m]SWCHYDRO2609.0[m]SWCHYDRO2610.0[m]SWCHYDRO2611.0[m]SWCHYDRO2613.0[m]SWCHYDRO2617.1[m]CHYDRO2626.6[m]CHYDRO2632.3[m]CHYDRO2638.0[m]CHYDRO2643.0[m]SWCHYDRO2647.5[m]SWCHYDRO2657.0[m]SWCHYDRO2667.0[m]CHYDRO2672.8[m]CHYDRO2676.9[m]CHYDRO2685.0[m]CHYDRO2688.3[m]CHYDRO2693.4[m]CHYDRO2699.8[m]CHYDRO2706.5[m]CHYDRO2709.2[m]CHYDRO2723.5[m]CHYDRO2726.0[m]CHYDRO2728.0[m]CHYDRO2728.5[m]CHYDRO2731.5[m]CHYDRO2732.8[m]CHYDRO2738.6[m]CHYDRO2742.7[m]CHYDRO2751.8[m]CHYDRO2752.7[m]CHYDRO2785.0[m]CHYDRO2785.9[m]CHYDRO2790.0[m]CHYDRO2791.9[m]CHYDRO2799.9[m]CHYDRO2804.1[m]CHYDRO2815.0[m]DCSTRAT2825.0[m]DCSTRAT2835.0[m]DCSTRAT2845.0[m]DCSTRAT2855.0[m]DCSTRAT2864.0[m]SWCHYDRO2875.0[m]DCSTRAT2885.0[m]DCSTRAT2895.0[m]DCSTRAT2905.0[m]DCSTRAT2915.0[m]DCSTRAT2926.0[m]SWCHYDRO2935.0[m]DCSTRAT2942.0[m]DCSTRAT2948.5[m]SWCHYDRO2960.0[m]DCSTRAT2969.5[m]SWCHYDRO2982.0[m]DCSTRAT