Generell informasjon Attributt VerdiBrønnbane navn25/8-17TypeEXPLORATIONFormålWILDCATStatusP&APressemeldingFaktakart i nytt vinduHovedområdeNORTH SEAFeltFunnBrønn navn25/8-17Seismisk lokaliseringxline 4558 inline 1341 NO07M01UtvinningstillatelseBoreoperatørExxonMobil Exploration and Production Norway ASBoretillatelse1266-LBoreinnretningBore dager21Borestart09.10.2009Boreslutt29.10.2009Frigitt dato29.10.2011Publiseringsdato29.10.2011Opprinnelig formålWILDCATGjenåpnetNOInnholdOILFunnbrønnbaneYES1. nivå med hydrokarboner, alderPALEOCENE1. nivå med hydrokarboner, formasjon.HEIMDAL FMAvstand, boredekk - midlere havflate [m]25.0Vanndybde ved midlere havflate [m]127.0Totalt målt dybde (MD) [m RKB]2233.0Totalt vertikalt dybde (TVD) [m RKB]2233.0Maks inklinasjon [°]1.5Temperatur ved bunn av brønnbanen [°C]86Eldste penetrerte alderPALEOCENEEldste penetrerte formasjonTY FMGeodetisk datumED50NS grader59° 23' 32.14'' NØV grader2° 20' 2.2'' ENS UTM [m]6584073.73ØV UTM [m]462168.23UTM sone31NPDID for brønnbanen6185
BrønnhistorieGeneralWell 25/8-17 was drilled on the Jetta prospect on Heimdal Terrace, south of the Jotun Field in the North Sea. The objective was to test the hydrocarbon and reservoir potential of the Paleocene Heimdal Formation. It was planned as a vertical well. A side track was planned in case of a discovery.Operations and resultsWildcat well 25/8-17 was spudded with the semi-submersible installation Bredford Dolphin on 9 October 2009 and drilled to TD at 2233 m in the Late Paleocene Ty Formation. Pilot holes were drilled from surface and after setting the 30" conductor to check for shallow gas. At 244 meters small amounts of bubbles were detected with the ROV, but when taking a flow check no more bubbles were seen. No significant technical problem occurred in the operations. The well was drilled with bentonite and seawater with hi-vis sweeps down to 222 m, with seawater and BARAZAN sweeps from 222 m to 1086 m, and with Performadril mud with 4.5 - 5 % glycol from 1086 m to TD.The target Heimdal Formation was penetrated at 2077 m and the upper sands were found hydrocarbon bearing. Analysis of logs, formation pressures and fluid samples gave a most likely oil water contact (OWC) at 2111 m (2086 m TVD MSL). However, pressure gradients indicated OWC at 2116 m, while shows on sandstones were recorded down to 2115 m. The oil bearing sands were between 3 and 1 m thick, but with excellent reservoir properties with average porosity of 24%. The average oil saturation in the upper two oil sands is 77 % and 50 % respectively. A massive, water bearing sandstone is present roughly in the middle part of Heimdal, with the same reservoir properties as the thinner oil bearing sands above.No cores were cut. MDT wire line samples were taken at 2094 m (oil), 2110.5 m (oil with some water), and at 2120.8 m (water).It was decided to drill a geological side track (25/8-17 A) towards the north-east, in an attempt to find thicker Heimdal sands. The well was plugged back and sidetracked on 29 October 2009. It is classified as an oil discoveryTestingNo drill stem test was performed.
Borekaks i OD
Borekaks i ODBorekaks tilgjengelig for prøvetaking?YES Borekaks i ODBorekaksprøve, topp dybde [m]Borekaksprøve, bunn dybde [m]1090.002232.00
LoggerType loggTopp dyp for logg [m]Bunn dyp for logg [m]CMR PEX HRLA10802202LWD - EWR GR PWD DIR152222LWD - EWR GR PWD DIR2221086LWD - EWR GR PWD DIR CTN DEN SON10862233MDT20802170VSI-41522208
Foringsrør og formasjonsstyrketester
Foringsrør og formasjonsstyrketesterType utforingUtforing diam.
[m]LOT/FIT slam eqv.
[g/cm3]Type formasjonstestCONDUCTOR30218.036217.60.00LOTSURF.COND.13 3/81080.017 1/21086.00.00LOTOPEN HOLE2233.012 1/42233.00.00LOT
BoreslamDybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling10861.3531.0PERFORMADRIL10901.3417.0XP-07 Yellow13471.3534.0PERFORMADRIL15161.3541.0PERFORMADRIL17581.3550.0PERFORMADRIL20981.3548.0PERFORMADRIL22331.3544.0PERFORMADRIL
TrykkplottPorertrykksdataene 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. TrykkplottDokument navnDokument formatDokument størrelse [KB]0.22