30/11-8 A
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Generell informasjon
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Brønnhistorie
GeneralWell 30/11-8 A is a sidetrack to the 30/11-8 S Krafla well in the Fensal Sub-basin between the Frigg and Oseberg fields in the North Sea. Well 30/11-8 S found oil in the Middle Jurassic Tarbert Formation and condensate in the Middle Jurassic Ness Formation. Similar formations and fluids as found in the 30/11-8 S Krafla main structure were also expected in the nearby Krafla West structure and the main objective for the 30/11-8 A sidetrack, was thus to prove commercial hydrocarbon accumulation in the Upper and Middle Tarbert Formation and potentially in Lower Brent Group. The Krafla West reservoir is situated approximately 400 m deeper than the Krafla main.Operations and resultsWell 30/11-8 A was kicked off at 2135 m (2135 m TVD) in main well bore 30/11-8 S on 20 May 2011. It was drilled with the semi-submersible installation Ocean Vanguard to TD at 4475 m (4268 m TVD) in the Early Jurassic Drake Formation. No significant problem was encountered in the operations. The well was drilled with XP-07 OBM from kick-off to TD.The Viking Group, Heather Formation was encountered at 3671 m (3471.8 m TVD). At 3802 m (3580 m TVD) an Intra-Heather Formation sandstone sequence was encountered with oil down to ca 3825 m (3602 m TVD). The Brent Group, Tarbert Formation was encountered at 3914.6 m (3713.1 m TVD), which was 61.9 m TVD shallower than prognosed. The Upper and Middle Tarbert Formation reservoirs proved to be condensate filled. The condensate-water contact is estimated at 4017 m (3791.6 m TVD). The Ness and Etive Formations were water filled. Apart from shows in the petroleum-bearing reservoirs the cutting shows descriptions from 4065 - 4083 m MD in the Tarbert Formation had strong yellowish direct fluorescence and very slow streaming milky white cut fluorescence.One core was cut from 3960 to 3993.5 m in the Tarbert Formation consisting of mainly sandstone and claystone. Depth shift of the core relative to the logs was 2.9 m down. MDT fluid samples were taken at 3810.1 m (oil), 3948.9 m (condensate), 3991.7 m (condensate), and at 4007 m (water).The well was permanently abandoned on 3 July 2011 as an oil and condensate discovery.TestingNo drill stem test was performed. -
Borekaks i Sokkeldirektoratet
Borekaks i Sokkeldirektoratet Borekaks tilgjengelig for prøvetaking?YESBorekaks i Sokkeldirektoratet Borekaksprøve, topp dybde [m]Borekaksprøve, bunn dybde [m]2135.004475.00 -
Borekjerner i Sokkeldirektoratet
Borekjerner i Sokkeldirektoratet Kjerneprøve nummerKjerneprøve - topp dybdeKjerneprøve - bunn dybdeKjerneprøve dybde - enhet13960.03993.6[m ]Borekjerner i Sokkeldirektoratet Total kjerneprøve lengde [m]33.6Borekjerner i Sokkeldirektoratet Kjerner tilgjengelig for prøvetaking?YES -
Oljeprøver i Sokkeldirektoratet
Oljeprøver i Sokkeldirektoratet Test typeFlaske nummerTopp dyp
MD [m]Bunn dyp
MD [m]Væske typeTest tidspunktPrøver tilgjengeligDST3991.700.00OIL17.02.2011 - 00:00YESDST3948.900.00OIL17.02.2011 - 00:00YESDST3810.100.00OIL17.02.2011 - 00:00YES -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet1304037672178217822372335251125812581294034813557367136713915391541594412442544364436 -
Geokjemisk informasjon
Geokjemisk informasjon Dokument navnDokument formatDokumentstørrelse [MB]txt0.00txt0.06 -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]CMR HNGS37944450DUAL OBMI DSI35704400LWD - ARCVRES6 STET TELE39604475LWD - ARCVRES8 TELE21353960MDT HC SA38103948MDT HC WSA39484007MDT PP38034423PEX AIT35554480PEX DSI20223558USIT CBL30653508 -
Foringsrør og formasjonsstyrketester
Foringsrør og formasjonsstyrketester Type utforingUtforing diam.
[tommer]Utforing dybde
[m]Brønnbane diam.
[tommer]Brønnbane dyp
[m]LOT/FIT slam eqv.
[g/cm3]Type formasjonstestINTERM.9 5/83557.012 1/43564.02.25LOTOPEN HOLE4475.08 1/24475.00.00LOT -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling21531.4529.0XP-07 - #1433951.8237.0XP-07 - #1435581.5328.0XP-07 - #1435691.6429.0XP-07 - #1439601.6529.0XP-07 - #1439931.7030.0XP-07 - #1442351.7434.0XP-07 - #1444751.7940.0XP-07 - #14