ODs Faktasider. Brønnbane / Leting. Generell informasjon. Brønnbane navn 25/2-12 EXPLORATION. Faktakart i nytt vindu.

Transkript

1 Generell informasjon Brønnbane navn 25/2-12 Type Formål Status Faktakart i nytt vindu Hovedområde Felt Funn EXPLORATION APPRAISAL P&A lenke NORTH SEA LILLE-FRIGG Brønn navn 25/ /2-4 LILLE-FRIGG Seismisk lokalisering EL SP 430 Boret i utvinningstillatelse 026 Boreoperatør Boretillatelse 584-L Boreinnretning Bore dager 119 Elf Petroleum Norge AS WEST VANGUARD Borestart Boreslutt Frigitt dato Publiseringsdato Opprinnelig formål Gjenåpnet Innhold Funnbrønnbane APPRAISAL NO GAS/CONDENSATE NO 1. nivå med hydrokarboner, alder MIDDLE JURASSIC 1. nivå med hydrokarboner, formasjon Avstand, boredekk - midlere havflate Vanndybde ved midlere havflate HUGIN FM Totalt målt dybde (MD) [m RKB] Totalt vertikalt dybde (TVD) [m RKB] Maks inklinasjon [ ] 2.8 Temperatur ved bunn av brønnbanen [ C] Eldste penetrerte alder Eldste penetrerte formasjon Geodetisk datum NS grader EARLY JURASSIC STATFJORD GP ED ' 48.34'' N Side 1 av 10

2 ØV grader 2 23' 40.78'' E NS UTM ØV UTM UTM sone 31 NPDID for brønnbanen 1290 Brønnhistorie General Well 25/2-12 was the second hole drilled on an NNESSV-oriented structural height in the northwestern part of the block. Well 25/2-4, which was drilled in 1975 in a more down flank position, found a 21 m gas column and a 48 m oil column in the Vestland Group. The Statfjord Formation was water bearing in 25/2-4, but its position was not optimal on the structure with regards to the Jurassic prospects. The main objective of well 25/2-12 was to examine the Statfjord Formation higher up on the structure than 25/4-2, including getting more information about the oil and gas discovery in the Vestland Group. Operations and results Appraisal well 25/2-12 was spudded 17 July 1988 by Smedvig semi-submersible rig West Vanguard and completed 13 November 1988 at a depth of 4103 m in the Late Jurassic Statfjord Formation. A 17 1/2" pilot hole was drilled from m and then opened to 26". Sand layers were encountered at 214 m and 259 m RKB, and MWD measurements showed no indication of shallow gas. Drilling proceeded without any significant problems down to 1366 m where metamorphic gravel plugged the bit so that it had to be changed. During clean-up of the hole, mud was lost to the sand formation at 890 m to 1000 m. "Lost circulation material" (LCM) was pumped into the well to isolate it. The well was in periods unstable. The Frigg Formation was water bearing. The gas readings were at times very high (up to 80 %). There was danger of losing the mud in Turonian limestone. Some fractures were observed higher up in the section. There were traces of gas in the limestone. Top Vestland Group came in at m, 112 m deeper than prognosed. The reason for this was assumed to be that the top of the Vestland Group had been faulted. The fluid contact was set to 3701 m. Analysis of this showed that it was a condensate column of 15 m. A total of five cores were cut. Core 1 was a "junk core". Cores 2 & 3 were cut in the Vestland Group and core 4 in the Dunlin Group. Core 4 was for geochemical studies. Core 5 was cut in the Statfjord Formation. RFT fluid sampling at m gave recovered 3.5 l mud filtrate, 1.1 l condensate/oil, and 1.8 Sm3 gas. When the Statfjord Formation was found water bearing, the NPD permitted EAN to change TD from 4225 m (Triassic) to 4100 m (113 m into the Statfjord Formation). It was plugged and abandoned as a gas/condensate appraisal. Testing One DST test was attempted in the interval m to m, but had to be stopped due to large sand production. Side 2 av 10

3 Borekaks i OD Borekaksprøve, topp dybde Borekaksprøve, bunn dybde Borekaksprøve tilgjengelig YES Borekjerner i OD Kjerneprøve nummer Kjerneprøve - topp dybde Kjerneprøve - bunn Kjerneprøve dybde dybde - enhet [m ] [m ] [m ] [m ] Total kjerneprøve lengde 60.6 Kjerneprøve tilgjengelig YES Kjernebilder m m m m m Side 3 av 10

4 Side 4 av 10

5 m m m m m m m m m m Side 5 av 10

6 m m m m m m m Litostratigrafi Top depth Lithostrat. unit 137 NORDLAND GP 890 UTSIRA FM Side 6 av 10

7 1020 HORDALAND GP 1073 SKADE FM 1110 NO FORMAL NAME 1210 GRID FM 1255 NO FORMAL NAME 1427 GRID FM 1440 NO FORMAL NAME 2042 FRIGG FM 2169 ROGALAND GP 2169 BALDER FM 2182 INTRA BALDER FM SS 2286 SELE FM 2300 HERMOD FM 2350 SELE FM 2419 LISTA FM 2492 VÅLE FM 2580 TY FM 2622 SHETLAND GP 2622 HARDRÅDE FM 2850 KYRRE FM 3333 TRYGGVASON FM 3550 BLODØKS FM 3572 SVARTE FM 3606 CROMER KNOLL GP 3606 RØDBY FM 3614 VIKING GP 3614 DRAUPNE FM 3634 HEATHER FM 3686 VESTLAND GP 3686 HUGIN FM 3713 SLEIPNER FM 3800 DUNLIN GP 3800 COOK FM 3876 AMUNDSEN FM 3990 STATFJORD GP Spleisede logger Side 7 av 10

8 navn format størrelse [KB] 1290 pdf 0.52 Geokjemisk informasjon navn format størrelse [KB] 1290_1 pdf _2 pdf 1.15 er - eldre OD WDSS rapporter og andre relaterte dokumenter navn format størrelse [KB] 1290_01_WDSS_General_Information pdf _02_WDSS_completion_log pdf 0.28 er - rapportert av utvinningstillatelsen (frigitt ihht til regelverk) navn 1290_25_2_12_COMPLETION_REPORT_AND_L OG format størrelse [KB] pdf Borestrengtester (DST) Test nummer Fra dybde MD Til dybde MD Reduksjonsven til størrelse [mm] Test nummer Endelig avstengningstrykk [MPa] Endelig strømningstrykk [MPa] Bunnhullstrykk [MPa] Borehullstempera tur [ C] 1.0 Test nummer Olje produksjon [Sm3/dag] Gass produksjon [Sm3/dag] Oljetetthet [g/cm3] Gasstyngde rel. luft GOR [m3/m3 ] 1.0 Side 8 av 10

9 Logger Type logg Topp dyp Bunn dyp for for logg logg CBL VDL GR CST GR DIL SLS GR SP DLL MSFL GR FMS GR LDL CNL NGT GR LDL GR MWD RFT GR VSP 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 LINER / LOT Boreslam Dybde Egenvekt, Viskositet, Flytegrense Type slam MD slam [g/cm3] slam [mpa.s] [Pa] Dato, måling WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED WATER BASED Side 9 av 10

10 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 10 av 10