Generell informasjon Attributt VerdiBrønnbane navn31/7-1TypeEXPLORATIONFormålWILDCATStatusP&APressemeldingFaktakart i nytt vinduHovedområdeNORTH SEAFunnBrønn navn31/7-1Seismisk lokaliseringInline 2414. Xline 2615 (LN11M03)Boret i utvinningstillatelseBoreoperatørFaroe Petroleum Norge ASBoretillatelse1620-LBoreinnretningBore dager31Borestart23.05.2016Boreslutt22.06.2016Frigitt dato22.06.2018Publiseringsdato22.06.2018Opprinnelig formålWILDCATGjenåpnetNOInnholdOIL/GASFunnbrønnbaneYES1. nivå med hydrokarboner, alderLATE JURASSIC1. nivå med hydrokarboner, formasjon.SOGNEFJORD FMAvstand, boredekk - midlere havflate [m]24.0Vanndybde ved midlere havflate [m]118.6Totalt målt dybde (MD) [m RKB]2780.0Totalt vertikalt dybde (TVD) [m RKB]2780.0Maks inklinasjon [°]1.3Temperatur ved bunn av brønnbanen [°C]109Eldste penetrerte alderEARLY JURASSICEldste penetrerte formasjonJOHANSEN FMGeodetisk datumED50NS grader60° 25' 31.55'' NØV grader3° 1' 28.23'' ENS UTM [m]6698949.76ØV UTM [m]501349.50UTM sone31NPDID for brønnbanen7954
BrønnhistorieGeneralWell 31/7-1 was drilled to test the Brasse prospect on the northern part of the Bjørgvin Arch between the Brage and Oseberg Sør fields in the North Sea. The primary exploration target for the wells was to prove and delineate petroleum in Middle Jurassic reservoir rocks (the Fensfjord Formation). The secondary exploration target was also in Middle Jurassic reservoir rocks (the Brent Group) and the third exploration target was in the Lower Jurassic (the Cook Formation and the Statfjord Group).Operations and resultsWildcat well 31/7-1 was spudded with the semi-submersible installation Transocean Arctic on 23 May 2016 and drilled to TD at 2780 m in the Early Jurassic Johansen Formation. No significant problem was encountered in the operations. The well was drilled with seawater and hi-vis pills down to 908 m and with KCl/polymer/GEM mud from 908 m to TD.The well encountered the Sognefjord Formation at 2154 m, just below the Draupne shales and overlaying the Fensfjord Formation. The Sognefjord sandstones/siltstones were found to be gas and oil bearing. Hydrocarbons columns of 18 m gas and 24.4 m oil were identified. MDT pressure data proved a GOC at 2172 m and an OWC at 2196.4 m GOC The Sognefjord Formation has 76 m gross reservoir, 28.76 m net reservoir, of which 21.13 m is net pay. Top Fensfjord was encountered at 2230 m. The Fensfjord Formation is mainly siltstones, and it is water bearing. Top Brent Group was encountered 6 m higher than prognosis, and all reservoirs were water bearing. The Cook Formation and the Statfjord Group were also water bearing. Oil shows were described in the hydrocarbon bearing part of the Sognefjord Formation, with weak shows below the OWC down to 2219 m. These were the only oil shows described in the well.Two cores were cut in succession from 2165 to 2249 m with 100% recovery. MDT fluid samples were taken at 2158.3 m (gas), 2170.95 m (gas), 2182.2 m (oil), and at 2200.98 m (water).The well bore was plugged back for sidetracking and abandoned on 22 June 2016 as an oil and gas discovery.TestingNo 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]920.002780.00
Borekjerner i OD
Borekjerner i ODKjerneprøve nummerKjerneprøve - topp dybdeKjerneprøve - bunn dybdeKjerneprøve dybde - enhet12165.02194.6[m ]22194.62248.6[m ] Borekjerner i ODTotal kjerneprøve lengde [m]83.6 Borekjerner i ODKjerner tilgjengelig for prøvetaking?YES
LitostratigrafiTop depth [m]Lithostrat. unit143679837837183518351905195020802085208521432143215422302373237323902415242524492449259826182756
LoggerType loggTopp dyp for logg [m]Bunn dyp for logg [m]LWD - DIR143209LWD - GR ECD RES DIR209908LWD - GR ECD RES DIR DEN NEU SON21152780LWD - GR ECD RES DIR SON2092115MDT GR21552231MSCT GR21452775MSIP GR20402770PEX HRLA CMR20702510USIT CBL GR16922106VSP GR20902770
Foringsrør og formasjonsstyrketester
Foringsrør og formasjonsstyrketesterType utforingUtforing diam.
[m]LOT/FIT slam eqv.
[g/cm3]Type formasjonstestCONDUCTOR30209.036209.00.00SURF.COND.13 3/8902.017 1/2908.01.70FITPILOT HOLE908.09 7/8908.00.00INTERM.9 5/82107.012 1/42115.01.67LOTOPEN HOLE2780.08 1/22780.00.00
BoreslamDybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling8541.4016.0KCL/Polymer/GEM10091.4016.0KCL/Polymer/GEM20001.4016.0KCL/Polymer/GEM20001.2516.0KCL/Polymer/GEM22801.2415.0KCL/POLYMER/GEM24811.2516.0KCl/Polymer/Glycol26741.2418.0KCL/POLYMER/GEM27801.2517.0KCl/Polymer/Glycol27801.2418.0KCl/Polymer/Glycol