7/11-12 S
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Generell informasjon
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Brønnhistorie
GeneralWell 7/11-12 S was drilled on the Peking Duck Prospect located 19km SW of the Ula Field and 28km NE of the UK Jade Field. The primary objective was to evaluate Triassic sandstones at a prognosed depth of 5212 m.Operations and resultsWildcat well 7/11-12 S was spudded with the jack-up installation Mærsk Gallant on 27 March 2011 and drilled to TD at 5420 m (5403 m TVD) in the Triassic Skagerrak Formation. Due to the possible risk of shallow gas, a 12-1/4" pilot hole was drilled from 255 m to 950m. No shallow gas was observed. There were no major problems involved in the operations, but due to deteriorating hole conditions wire line logging at TD was terminated without obtaining satisfactory XPT pressure data. The well was drilled with seawater and hi-vis sweeps down to 255 m, with KCl/Polymer mud from 255 m to 964 m, with Versatec oil based mud from 964 m to 3900 m, with Paratherm Oil based mud from 3900 m to 4964 m, and with WARP oil based mud from 4964 m to TD.As prognosed, the Forties Formation was present as a water wet, poorly developed sandstone with argillaceous interbeds. The Jurassic J62 sand (Ula Formation) was penetrated at 5197 m (5181 m TVD) and the Triassic Skagerrak Formation at 5212.5 m (5197 m TVD). A 40 m hydrocarbon column was identified from the top of the J62 sandstone down to a Gas Down To (GDT) at 5237 m (5221 m TVD) in the Triassic Skagerrak Formation. However, with a 9.1 % porosity cut off there were no net pay in the J62 sandstone. In the Triassic 16.5 m net pay with 10% average porosity was estimated. The only oil shows above the oil based muds used in the well was recorded on shales in the Mandal Formation.No conventional cores were cut and no wire line fluid samples were taken.The well was plugged back on 16 July 2011 as a minor gas discovery. A sidetrack to a separate prospect (Agn) was decided and initiated.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]270.005420.00 -
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 formasjonstestCONDUCTOR30244.036255.00.00LOTSURF.COND.20959.026964.01.75LOTPILOT HOLE970.012 1/4970.01.97LOTINTERM.13 3/83895.017 1/23900.02.30LOTINTERM.10 3/44958.012 1/44964.00.00LOTOPEN HOLE5420.08 1/20.00.00LOT -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]H-XPT ECRI LEHQT49585349MSCT52165216MSCT52545342MWD - DGR EWR DIR PWD255950MWD - DGR EWR DIR QBAT PWD9704964MWD - DGR EWR GEOTAP PWD QBAT DI49645420MWD - DIR119970QAIT QSLT QTGC ECRI LEHQT48605421QAST1315325 -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet11916062899315231523171323333323415346934693567406646444660480748074873488849355059505950825197519752135213 -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling1221.1413.0Water Base2901.1715.0Water Base5971.5847.0Versatec97012.0414.0Potassium Base10221.6049.0Versatec10391.5840.0Versatec10841.6450.0Versatec11891.6451.0Versatec39001.6465.0Oil Base39501.6835.0Warp39761.6738.0Paratherm42581.7340.0Paratherm47701.6832.0Warp47701.6931.0Warp48571.8042.0Paratherm49642.0850.0Warp49641.9343.0Paratherm49952.0851.0Warp53402.1770.0Warp54202.1772.0Warp