25/10-10
Eksport: PDF
-
Generell informasjon
-
Brønnhistorie
GeneralWell 25/10-10 was drilled just west of the Balder Field complex on the Utsira High in the North Sea. The well was planned to test the hydrocarbon potential of the Balder Triassic prospect with reservoir of Early Triassic age in the Smith Bank Formation as the primary target.Operations and resultsWildcat well 25/10-10 was spudded with the semi-submersible installation Aker Barents on 1 March 2010 and drilled to TD at 2513 m in the Late Permian Zechstein Group. The well was drilled with a 9 7/8" pilot hole prior to the 17 1/2" from 234 m to 1102 m to check for shallow gas. No shallow gas was seen. The well was drilled with seawater and hi-vis sweeps down to 234 m, with pre-hydrated bentonite/CMC/Seawater from 234 m to 1102 m, and with Glydril mud containing 5.0 - 5.5 % glycol from 1102 m to TD.The Skade Formation in the Hordaland Group and the Balder Formation in the Rogaland Group was found to be hydrocarbon bearing. The Skade Formation is 11 m thick and has a porosity ranging from 15 to 33% with an average of 17.4%. The net sand and pay interval was 2.3 m, however no shows were recorded here and it was interpreted that these hydrocarbons were severely biodegraded. The more heterogeneous hydrocarbon interval in Balder Sandstone Formation in the Upper Rogaland Group ranged from 12 to 24% with an average of 17.5%. A net pay interval of 1.7 m in a net sand interval of 5.6 m was found.The Late Cretaceous Tor formation was found directly resting on the Early Jurassic Statfjord Formation at 2072 m. No Middle - Late Jurassic sediments were present in the well. The target Intra Triassic sandstone was encountered 77 m deep to prognosis, at 2432 m. The Intra Triassic sand was 56 m thick with 44 m net pay of 18.2 % porosity. However, the sand was water wet as was all Triassic to Early Jurassic sandstones. Weak oil shows were recorded in the Balder formation from 1767 to 1790 m, in silty sequences in the Statfjord Formation at 2096 to 2119.5 m and 2143.5 to 2199 m, in sandstone at 2290.5 m in the middle of the Skagerrak Formation, and at 2433 m in the top of the primary target Intra Triassic Sandstone.No cores were cut. The MDT tool was run to acquire pressure points, but no fluid samples were taken.The well was permanently abandoned on 2 April 2010 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]1110.002513.00 -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet164575710777777112712591270150515181768176817841793181318511856191319401991203620692069207221732173236824322488 -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]MDT SP20732496MSCT20592496MWD LWD - GR RES DEN NEU SON PWD11022513MWD LWD - GR RES PWD2341102MWD LWD - PWD DIR2341102PEX HRLA HNGS25112070VSP2002500 -
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 formasjonstestCONDUCTOR30230.036234.00.00LOTSURF.COND.13 3/81097.017 1/21102.00.00LOTPILOT HOLE1102.09 7/81102.00.00LOTOPEN HOLE2513.012 1/43513.00.00LOT -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling4901.4329.0Glydril8121.0525.0Sweeps11421.399.0Sweeps17291.4418.0Glydril24611.4326.0Glydril25531.4427.0Glydril25531.4326.0Glydril