31/4-12
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Generell informasjon
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Brønnhistorie
GeneralWildcat well 31/4-12 is located just east of the Brage Field on the Bjørgvin Arch in the Northern North Sea. The main objective of the well was to prove hydrocarbon volume of economic interest in the Sognefjord formation of the Viking Group within the Idun Prospect in block 31/4. The secondary objective was to investigate the stratigraphic distribution and the reservoir potential of the Fensfjord formation.Operations and resultsWell 31/4-12 was spudded with the semi-submersible installation Deepsea Trym on 6 February 2005 and drilled to TD at 2226 m in late Middle Jurassic sediments of the Fensfjord Formation. The well had 26% downtime due mainly to rough weather and problems with the BOP. Otherwise no significant problems were encountered in the operations. The well was drilled with bentonite mud down to 1184 m and with "Aqua-drill" glycol mud from 1184 m to TD.Both Draupne Formation sands and Sognefjord Formation sand were penetrated. A total of 20 m of the main reservoir Sognefjord Formation sand was penetrated in the well. Approximately 17 m of this interval was reservoir sand with excellent quality (close to the P10 values simulated in H-risk). The Draupne sands were dated to Kimmeridgian age, while the Sognefjord sand was of Oxfordian age. The lower Fensfjord Formation reservoir sand, penetrated close to TD of the well, was of Late Callovian - Early Oxfordian age. All sands were water bearing, and no shows were observed. The MDT pressure tests showed that the Draupne / Sognefjord reservoir was depleted by approximately 10 bar indicating a common aquifer with a producing reservoir, most likely the Brage Nord Sognefjord reservoir.The wire line logging programme was reduced as no commercial discovery was made. No cores were cut and no wire line fluid samples were taken.The well was permanently abandoned on 14 March 2005 as a dry well.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]1190.002226.00 -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet235767895171917191775182119041977197719951995202520432043208921252172 -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]DSI17782221MDT GR20812215MWD LWD - DIR235308MWD LWD - DIR GR RES3082226PEX HRLA ECS DSI20572228VSI GR13782150VSP13782209 -
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 formasjonstestCONDUCTOR30308.036308.00.00LOTSURF.COND.13 3/81178.017 1/21184.01.81LOTINTERM.9 5/82056.012 1/42062.01.77LOTOPEN HOLE2226.08 1/22226.00.00LOT -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling3101.50WATER BASED5001.5420.0WATER BASED11841.3919.0WATER BASED16701.5020.0WATER BASED20521.2016.0WATER BASED22261.1616.0WATER BASED -
Trykkplott
Trykkplott Porertrykksdataene 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.Trykkplott Dokument navnDokument formatDokumentstørrelse [MB]pdf0.19