ODs Faktasider. Brønnbane / Leting. Generell informasjon. Brønnbane navn 31/2-11 EXPLORATION. Faktakart i nytt vindu. lenke 31/2-1 TROLL VEST

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1 Generell informasjon Brønnbane navn 31/2-11 Type Formål Status Faktakart i nytt vindu Hovedområde Felt Funn EXPLORATION APPRAISAL P&A lenke NORTH SEA TROLL Brønn navn 31/ /2-1 TROLL VEST Seismisk lokalisering SP 778 Boret i utvinningstillatelse 054 Boreoperatør Boretillatelse 365-L Boreinnretning Bore dager 70 A/S Norske Shell BORGNY DOLPHIN Borestart Boreslutt Frigitt dato Publiseringsdato Opprinnelig formål Gjenåpnet Innhold Funnbrønnbane APPRAISAL NO OIL/GAS NO 1. nivå med hydrokarboner, alder LATE JURASSIC 1. nivå med hydrokarboner, formasjon Avstand, boredekk - midlere havflate Vanndybde ved midlere havflate SOGNEFJORD FM Totalt målt dybde (MD) [m RKB] Totalt vertikalt dybde (TVD) [m RKB] Maks inklinasjon [ ] 1.25 Temperatur ved bunn av brønnbanen [ C] Eldste penetrerte alder Eldste penetrerte formasjon Geodetisk datum NS grader 76 MIDDLE JURASSIC FENSFJORD FM ED ' 27.76'' N Side 1 av 7

2 ØV grader 3 25' 30.16'' E NS UTM ØV UTM UTM sone 31 NPDID for brønnbanen 6 Brønnhistorie General Well 31/2-11 was drilled as an appraisal well in the Troll West oil province in the Northern North Sea. The main objectives were to appraise the reservoir quality and the extension of the 28-m oil column in the southern part of the 31/2-7 accumulation in the Viking Group reservoir sequence. The well would assist in the mapping of the permeability distribution in the oil province, provide an additional data point for the correlation and mapping of the depositional units, and obtain additional oil production test data for input to the field development. Operations and results Well 31/2-11 was spudded with the semi-submersible installation Borgny Dolphin on 17 March 1983 and drilled to TD at 1744 m in the Middle Jurassic Fensfjord Formation. No major problems occurred during drilling. The well was drilled with Seawater and gel down to 810 m, with KCl/polymer mud from 810 m to 1535 m, and with CaCl2/CaCO3/polymer mud from 1535 m to TD. Top Jurassic, Sognefjord Formation, was encountered at 1558 m. The reservoir sands were found to be hydrocarbon bearing with GOC at 1566 m (1541 m sub-sea) and OWC (50% saturation) at 1593 m (1567 m sub-sea), in-line with the regional contacts in this area of the Troll West Oil Province. Below OWC residual oil was interpreted down to some 1640 m. A total of eight cores were cut. To enable investigation of the shallow sediments, 2 cores were cut in the interval 380 m to 399 m and one from 475 to 476 m. Five cores were cut in the Late Jurassic reservoir sands from 1555 to 1629 m using fibre glass sleeve techniques to achieve better recovery in the poorly consolidated sands. Attempts to obtain RFT fluid samples were unsuccessful due to plugging of the tool with chalk particles from the mud. The well was permanently abandoned on 25 May 1983 as an oil and gas appraisal. ing Two DST's were performed, one in the water zone and one in the oil zone. DST 1 tested the interval 1681 to 1685 m in the water zone with the objective of obtaining representative formation water samples. The test produced 20 m3 water before the well died. Representative Formation water samples were obtained. DST 2 in the oil zone was carried out in a clean sand interval between 1571 and 1582 m. It produced at maximum rate on 2x128/64" choke 1248 Sm3 oil with a GOR of 315 Sm3/Sm3. The oil produced had a gravity of 28.6 deg API and the separator gas gravity was 0.66 (air = 1). The gas contained about 2% CO2 and no measurable H2S. No water or gas breakthrough was observed, probably due to tight calcareous streaks above and below the tested interval. The maximum temperature recorded in DST 2 was 68.6 deg C. Side 2 av 7

3 Borekaks i OD Borekaksprøve, topp dybde Borekaksprøve, bunn dybde Borekaksprøve tilgjengelig YES Borekjerner i OD Kjerneprøve Kjerneprøve - topp dybde Kjerneprøve - bunn Kjerneprøve dybde dybde - enhet [m ] [m ] [m ] [m ] [m ] Total kjerneprøve lengde 58.7 Kjerneprøve tilgjengelig YES Kjernebilder m m m m m m m m m m Side 3 av 7

4 m m m Oljeprøver i OD type Flaske Topp dyp MD Bunn dyp MD Væske type tidspunkt Prøver tilgjengelig DST :00 YES Litostratigrafi Top depth Lithostrat. unit 361 NORDLAND GP 788 HORDALAND GP 1342 ROGALAND GP 1342 BALDER FM 1408 SELE FM 1443 LISTA FM 1537 SHETLAND GP 1550 CROMER KNOLL GP 1558 VIKING GP 1558 SOGNEFJORD FM 1611 HEATHER FM 1678 FENSFJORD FM er - eldre OD WDSS rapporter og andre relaterte dokumenter navn format størrelse [KB] 6_01_WDSS_General_Information pdf _02_WDSS_completion_log pdf 0.18 Side 4 av 7

5 er - rapportert av utvinningstillatelsen (frigitt ihht til regelverk) navn 6_01_31_2_11_Completion_Report_and_Com pletion_log format størrelse [KB] PDF _02_31_2_11_Assey_of_crude_oil_sample pdf _02_31_2_11_Drilling_programme pdf _02_31_2_11_Emulsions_of_Troll_crude_oil pdf _02_31_2_11_Grain_size_analysis pdf _02_31_2_11_High_acc.press_temp_measur e 6_02_31_2_11_High_acc.press_temp_measur e_gravel_pack 6_02_31_2_11_High_acc.press_temp_measur e_injection_test 6_02_31_2_11_Production_test_programme_ b pdf 1.86 pdf pdf pdf _02_31_2_11_PVT_study pdf _02_31_2_11_Report_on_the_low_damaging pdf _02_31_2_11_Routine_core_analysis pdf _02_31_2_11_Sedimentologi_av_kjerne pdf _02_31_2_11_Water_samples pdf _02_31_2_11_Well_summary pdf _02_31_2_11_Well_test.rep.no _Anx 6_02_31_2_11_Well_testing_rep.no _02_31_2_11_Well_testing_rep.no _02_31_2_11_Well_testing_rep.no pdf pdf 8.89 pdf 1.25 pdf _02_31_2_11_Well_test_Int.Report#290 pdf 0.99 Borestrengtester (DST) Fra dybde MD Til dybde MD Reduksjonsven til størrelse [mm] Side 5 av 7

6 Endelig avstengningstrykk [MPa] Endelig strømningstrykk [MPa] Bunnhullstrykk [MPa] Borehullstempera tur [ C] Olje produksjon [Sm3/dag] Gass produksjon [Sm3/dag] Oljetetthet [g/cm3] Gasstyngde rel. luft GOR [m3/m3 ] Logger Type logg Topp dyp Bunn dyp for for logg logg CBL VDL CBL VDL CST DLL MSFL HDT ISF BHC GR ISF BHC GR ISF BHC GR LDL CNL GR CAL LDL CNL GR CAL LDL CNL NGT CAL RFT 0 0 WST Foringinsrør og formasjonsstyrketester Type utforing Utforing diam. [tommer] Utforing dybde Brønnbane diam. [tommer] Brønnbane dyp Slam egenvekt ekvivalent [g/cm3] Type formasjonstest CONDUCTOR LOT SURF.COND LOT INTERM. 13 3/ / LOT INTERM. 9 5/ / LOT Side 6 av 7

7 Boreslam Dybde Egenvekt, Viskositet, Flytegrense Type slam MD slam [g/cm3] slam [mpa.s] [Pa] waterbased waterbased waterbased waterbased waterbased waterbased waterbased Dato, måling Side 7 av 7