ODs Faktasider. Brønnbane / Leting. Generell informasjon. Brønnbane navn 35/11-5 EXPLORATION. Faktakart i nytt vindu. lenke

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1 Generell informasjon Brønnbane navn 35/11-5 Type Formål Status Faktakart i nytt vindu Hovedområde EXPLORATION WILDCAT P&A lenke NORTH SEA Funn 35/11-5 Brønn navn 35/11-5 Seismisk lokalisering MN & SP. 822 Boret i utvinningstillatelse 090 Boreoperatør Boretillatelse 687-L Boreinnretning Bore dager 130 Mobil Exploration Norway INC SOVEREIGN EXPLOR Borestart Boreslutt Frigitt dato Publiseringsdato Opprinnelig formål Gjenåpnet Innhold Funnbrønnbane WILDCAT NO OIL/GAS YES 1. nivå med hydrokarboner, alder LATE JURASSIC 1. nivå med hydrokarboner, formasjon SOGNEFJORD FM 2. nivå med hydrokarboner, alder MIDDLE JURASSIC 2. nivå med hydrokarboner, formasjon Avstand, boredekk - midlere havflate [m] Vanndybde ved midlere havflate [m] TARBERT FM Totalt målt dybde (MD) [m RKB] Totalt vertikalt dybde (TVD) [m RKB] Maks inklinasjon [ ] 2.2 Temperatur ved bunn av brønnbanen [ C] Eldste penetrerte alder Eldste penetrerte formasjon EARLY JURASSIC STATFJORD GP Side 1 av 15

2 Geodetisk datum ED50 NS grader 61 4' 45.58'' N ØV grader 3 23' 53.49'' E NS UTM [m] ØV UTM [m] UTM sone 31 NPDID for brønnbanen 1780 Brønnhistorie Side 2 av 15

3 General Well 35/11-5 was drilled on the "D" West prospect on the northwestern part of the Horda Platform, and ca 18 km north of the Troll Field. The primary objective for 35/11-5 was the Middle Jurassic Brent Group. Reservoirs were expected in the Tarbert, Ness, Etive, and Oseberg Formations. Secondary there was a possibility for reservoir development in the Late Jurassic Sognefjord Formation. Similar sands are the main reservoir in the Troll area, and were expected to be well developed in the eastern part of the block. No shallow gas warnings were given. Boulders might be encountered in the interval m. The well was planned to be drilled to a total depth of 3678 m. Operations and results Wildcat well 35/11-5 was spudded with the semi-submersible installation Sovereign Explorer on 27 June 1991 and drilled to TD at 3769 m in the Early Jurassic Statfjord Formation. The well reached a depth of 1118 m before technical problems caused the well to be plugged back and sidetracked. Further problems in the sidetrack caused the well to be abandoned and re-spudded on 18 July 1991, 50 m northwest of the original location. The first well bore was drilled with seawater and hi-vis pills. The second and final well bore was drilled with seawater and hi-vis pills to 1010 m, and with KCl/polymer mud from 1010 m to TD Water bearing sandstones were drilled in Palaeocene. The Draupne Formation was penetrated at m. The Sognefjord Formation came in at 2875 m and consisted predominantly of claystones with some sandstone interbeds. Shows were observed in cuttings, and RFT samples recovered contained oil and gas. However, reservoir quality of the sandstones was generally poor and there was less than 5 m of net pay. In the Middle Jurassic Brent Group, shows were observed in cores from 3208 m down to 3305 m. Light oil/condensate and gas was recovered from an RFT sample taken at 3214 m. Reservoir quality was however poor with only 5.4 m of net pay in the Tarbert Formation. Establishing the gas/-condensate-water contact was also difficult because of the poor porosity and permeability throughout the Brent Group. However, there were indications that hydrocarbons could be present below the base of the Tarbert Formation at 3216 m. Organic geochemistry show that the 217 m thick Draupne Formation contain mainly type II kerogen and has a rich potential for oil and gas. The deeper Heather Formation, with similar thickness, also has a rich potential for oil and gas but has a more variable source potential with kerogen type II to III. Various maturity indicators as well as weak shows recorded during drilling show that the Draupne shales are effectively immature for petroleum expulsion in the well position. Heather probably has reached sufficient thermal maturity to have generated and expelled some of its potential. Consistent with the shows record while drilling no migrant hydrocarbons were found by these analyses above base Cretaceous. A total of seven cores were cut in the interval 3215 m to 3356 m within the Brent Group, recovering a total of m core. A total of 240 sidewall cores were attempted in 4 runs, and 150 were recovered. One RFT sample was taken at m in the Sognefjord Formation (gas, 5.7 litre 34.1 API oil, and mud filtrate) and two in the Tarbert Formation at m (gas, mud filtrate, and good trace of light oil), and at 3214 m (gas, mud filtrate and 1.3 litre 42.3 API oil) The well was permanently abandoned on 3 November 1991 as a minor oil and gas/condensate discovery. Testing No drill stem test was performed. Side 3 av 15

4 Borekaks i OD Borekaksprøve, topp dybde [m] Borekaksprøve, bunn dybde [m] Borekaksprøve tilgjengelig YES Borekjerner i OD Kjerneprøve nummer Kjerneprøve - topp dybde Kjerneprøve - bunn Kjerneprøve dybde dybde - enhet [m ] [m ] [m ] [m ] [m ] [m ] [m ] Total kjerneprøve lengde [m] Kjerneprøve tilgjengelig YES Kjernebilder m m m m m m m m m m Side 4 av 15

5 m m m m m m m m m m m m m m m m m m m m m m m m Palynolgiske preparater i OD Prøve dybde Dybde enhet Prøve type Laboratorie [m] SWC MOBIL [m] DC MOBIL [m] SWC MOBIL Side 5 av 15

6 [m] SWC MOBIL [m] SWC MOBIL [m] DC MOBIL [m] DC MOBIL [m] SWC MOBIL [m] SWC MOBIL [m] DC MOBIL [m] SWC MOBIL [m] DC MOBIL [m] SWC MOBIL [m] DC MOBIL [m] SWC MOBIL [m] DC MOBIL [m] SWC MOBIL [m] DC MOBIL [m] SWC MOBIL [m] DC MOBIL [m] DC MOBIL [m] SWC MOBIL [m] DC MOBIL [m] DC MOBIL [m] SWC MOBIL [m] DC MOBIL [m] SWC MOBIL [m] DC MOBIL [m] SWC MOBIL [m] DC MOBIL [m] SWC MOBIL [m] DC MOBIL [m] DC MOBIL [m] SWC MOBIL [m] DC MOBIL [m] DC MOBIL [m] SWC MOBIL [m] DC MOBIL [m] DC MOBIL [m] SWC MOBIL [m] DC MOBIL [m] SWC MOBIL [m] SWC MOBIL Side 6 av 15

7 [m] DC MOBIL [m] SWC MOBIL [m] SWC MOBIL [m] SWC MOBIL [m] DC MOBIL [m] SWC MOBIL [m] DC MOBIL [m] DC MOBIL [m] DC MOBIL [m] DC MOBIL [m] DC MOBIL [m] DC MOBIL [m] DC MOBIL [m] DC MOBIL [m] DC MOBIL [m] DC MOBIL [m] DC MOBIL [m] SWC MOBIL [m] SWC MOBIL [m] SWC MOBIL [m] SWC MOBIL [m] SWC MOBIL [m] SWC MOBIL [m] DC MOBIL [m] SWC MOBIL [m] DC MOBIL [m] DC MOBIL [m] SWC MOBIL [m] SWC MOBIL [m] SWC MOBIL [m] DC MOBIL [m] SWC MOBIL [m] SWC MOBIL [m] SWC MOBIL [m] DC MOBIL [m] SWC MOBIL [m] SWC MOBIL [m] DC MOBIL [m] SWC MOBIL [m] DC MOBIL Side 7 av 15

8 [m] SWC MOBIL [m] DC MOBIL [m] SWC MOBIL [m] SWC MOBIL [m] DC MOBIL [m] SWC MOBIL [m] SWC MOBIL [m] SWC MOBIL [m] SWC MOBIL [m] SWC MOBIL [m] SWC MOBIL [m] SWC MOBIL [m] SWC MOBIL [m] SWC MOBIL [m] DC MOBIL [m] SWC MOBIL [m] DC MOBIL [m] SWC MOBIL [m] SWC MOBIL [m] DC MOBIL [m] SWC MOBIL [m] DC MOBIL [m] SWC MOBIL [m] DC MOBIL [m] SWC MOBIL [m] DC MOBIL [m] DC MOBIL [m] SWC MOBIL [m] DC MOBIL [m] SWC MOBIL [m] DC MOBIL [m] DC MOBIL [m] SWC MOBIL [m] SWC MOBIL [m] SWC MOBIL [m] SWC MOBIL [m] SWC MOBIL [m] DC MOBIL [m] DC MOBIL [m] SWC MOBIL Side 8 av 15

9 [m] DC MOBIL [m] SWC MOBIL [m] SWC MOBIL [m] SWC MOBIL [m] SWC MOBIL [m] DC MOBIL [m] SWC MOBIL [m] SWC MOBIL [m] SWC MOBIL [m] DC MOBIL [m] DC MOBIL [m] DC MOBIL Litostratigrafi Top depth [m] Lithostrat. unit 382 NORDLAND GP 771 UTSIRA FM 845 UNDIFFERENTIATED 855 HORDALAND GP 1701 ROGALAND GP 1701 BALDER FM 1753 SELE FM 1836 LISTA FM 1850 NO FORMAL NAME 1888 LISTA FM 2023 VÅLE FM 2044 SHETLAND GP 2550 CROMER KNOLL GP 2550 RØDBY FM 2582 ÅSGARD FM 2621 MIME FM 2658 VIKING GP 2658 DRAUPNE FM 2875 SOGNEFJORD FM 2950 HEATHER FM 3206 BRENT GP 3206 TARBERT FM 3216 NESS FM 3293 ETIVE FM Side 9 av 15

10 3312 RANNOCH FM 3342 OSEBERG FM 3396 DUNLIN GP 3396 DRAKE FM 3467 COOK FM 3533 AMUNDSEN FM 3570 JOHANSEN FM 3628 AMUNDSEN FM 3689 STATFJORD GP Spleisede logger navn format størrelse [KB] 1780 pdf 0.57 Geokjemisk informasjon navn format størrelse [KB] 1780_1 pdf 6.60 er - eldre OD WDSS rapporter og andre relaterte dokumenter navn format størrelse [KB] 1780_01_WDSS_General_Information pdf _02_WDSS_completion_log pdf 0.20 er - rapportert av utvinningstillatelsen (frigitt ihht til regelverk) navn 1780_35_11_5_COMPLETION_REPORT_AND_L OG format størrelse [KB] pdf Logger Type logg Topp dyp Bunn dyp for for logg [m] logg [m] CST GR CST GR Side 10 av 15

11 CST GR CST GR DIL SDT AMS GR DIL SDT LDT GR AMS DLL MSFL AMS GR FMS GR LDT CNL AMS GR MOBIL LSAL SWAL MOBIL LSAL SWAL MWD - GR RES DIR RFT HP GR P RFT HP GR P RFT HP GR P RFT HP GR P S RFT HP GR S RFT HP GR S SHDT GR VSP Foringinsrør og formasjonsstyrketester Type utforing Utforing diam. [tommer] Utforing dybde [m] Brønnbane diam. [tommer] Brønnbane dyp [m] Slam egenvekt ekvivalent [g/cm3] Type formasjonstest CONDUCTOR LOT INTERM LOT INTERM. 13 3/ / LOT OPEN HOLE / LOT Boreslam Dybde Egenvekt, Viskositet, Flytegrense Type slam MD [m] slam [g/cm3] slam [mpa.s] [Pa] Dato, måling WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED Side 11 av 15

12 WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED Side 12 av 15

13 WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED Side 13 av 15

14 WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED Side 14 av 15

15 WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED Side 15 av 15