25/11-27
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Generell informasjon
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Brønnhistorie
GeneralWell 25/11-27 was drilled on the Grane F-structure, ca nine kilometres northeast of the Grane field in the North Sea. The primary objective was to prove petroleum in Paleocene reservoir rocks (the Heimdal Formation), but also to find out if there could be communication with the Grane field in the event of a discovery.Operations and resultsWildcat well 25/11-27 was spudded with the semi-submersible installation Songa Trym on 4 May 2013 and drilled to TD at 1890 m in the Late Cretaceous Tor Formation. The first attempt to spud failed due a very competent seabed. The re-spud was successful and operations proceeded without further significant problems. No shallow gas was seen. The well was drilled with seawater and hi-vis sweeps down to 1159 m and with XP-07 oil based mud from 1159 m to TD.Top of the primary target Heimdal Formation was encountered at 1743 m, 10 m shallow to prognosis. The Heimdal Formation contains four sandstones in the upper part, varying in thickness between 2 to 5 meters, and a 39 m thick massive sandstone with top at 1766 m in the lower part. The sandstones were oil bearing with all five sandstones on the same oil gradient. The OWC was clearly defined at 1785 m in the middle of the lower sandstone. The reservoir had excellent properties. Pressure measurements show a highly undersaturated oil with similar properties and the same pressure regime as the main Grane Field reservoir. No oil shows were described in the well other than in the oil-bearing sandstones in the Heimdal Formation.One core was cut from 1769.4 to 1796.5 m in the lower Heimdal massive sandstone. MDT fluid samples were taken at 1766.5 m (oil of density 0.929 g/cm3) and 1803 m (water).The well was permanently abandoned on 29 May 2013 as an oil 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]1160.001890.00 -
Borekjerner i Sokkeldirektoratet
Borekjerner i Sokkeldirektoratet Kjerneprøve nummerKjerneprøve - topp dybdeKjerneprøve - bunn dybdeKjerneprøve dybde - enhet11769.01795.5[m ]Borekjerner i Sokkeldirektoratet Total kjerneprøve lengde [m]26.5Borekjerner i Sokkeldirektoratet Kjerner tilgjengelig for prøvetaking?YES -
Palynologiske preparater i Sokkeldirektoratet
Palynologiske preparater i Sokkeldirektoratet Prøve dybdeDybde enhetPrøve typeLaboratorie1200.0[m]DCFUGRO1220.0[m]DCFUGRO1240.0[m]DCFUGRO1260.0[m]DCFUGRO1280.0[m]DCFUGRO1300.0[m]DCFUGRO1320.0[m]DCFUGRO1340.0[m]DCFUGRO1360.0[m]DCFUGRO1380.0[m]DCFUGRO1400.0[m]DCFUGRO1420.0[m]DCFUGRO1430.0[m]DCFUGRO1440.0[m]DCFUGRO1450.0[m]DCFUGRO1460.0[m]DCFUGRO1480.0[m]DCFUGRO1500.0[m]DCFUGRO1520.0[m]DCFUGRO1540.0[m]DCFUGRO1560.0[m]DCFUGRO1580.0[m]DCFUGRO1600.0[m]DCFUGRO1620.0[m]DCFUGRO1640.0[m]DCFUGRO1660.0[m]DCFUGRO1670.0[m]DCFUGRO1680.0[m]DCFUGRO1690.0[m]DCFUGRO1693.0[m]DCFUGRO1696.0[m]DCFUGRO1699.0[m]DCFUGRO1702.0[m]DCFUGRO1705.0[m]DCFUGRO1711.0[m]DCFUGRO1717.0[m]DCFUGRO1723.0[m]DCFUGRO1729.0[m]DCFUGRO1732.0[m]DCFUGRO1735.0[m]DCFUGRO1741.0[m]DCFUGRO1747.0[m]DCFUGRO1753.0[m]DCFUGRO1759.0[m]DCFUGRO1765.0[m]DCFUGRO1769.5[m]DCFUGRO1798.0[m]DCFUGRO1804.0[m]DCFUGRO1810.0[m]DCFUGRO1816.0[m]DCFUGRO1822.0[m]DCFUGRO1828.0[m]DCFUGRO1834.0[m]DCFUGRO1840.0[m]DCFUGRO -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet15366498310651107170117011730174318051838184218421851 -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]MDT17161803MWD - PD VARC8 TELE GVR811591890MWD - PD VARC9 TELE2081159PEX MSIP AIT11501896VSI4 GR3561820 -
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 formasjonstestCONDUCTOR30202.036208.00.00INTERM.13 3/81150.617 1/21159.01.71LOTOPEN HOLE1890.012 1/41890.00.00 -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling2081.03seawater11591.03seawater18901.28OBM XP-07