25/7-4 S
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Generell informasjon
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Brønnhistorie
GeneralBlock 25/7 is situated in the South Viking Graben on the western side of the Utsira High, a basement high that tilts slightly towards the east. The South Viking Graben has an asymmetrical profile bounded in the west by the Brea/Crawford Fault Zone and the Utsira High to the east. The Jotun Field is sitting on a basement terrace stepping up to the Utsira High from the Graben area. Well 25/7-1 drilled in 1986 for a Jurassic target encountered oil shows in thin ratty sands in the Paleocene Hermod Formation.Exploration well 25/7-4 S was drilled to test the 25/7 Hermod South prospect, a stratigraphic trap comprising of channelised basin floor sandstones of the Paleocene Hermod Formation. The primary objectives of the well were to test the presence of hydrocarbons in the Hermod South prospect and to establish hydrocarbon type(s) and fluid contacts (if present). A secondary objective was to evaluate the Lower Tertiary interval by ensuring that the well penetrates into the Cretaceous.Operations and resultsExploration well 25/7-4 S was spudded with the semi-submersible installation "Maersk Jutlander" on 2 June 1997 and drilled to a total depth of 2560 m in the Late Cretaceous Tor Formation. Operations went without problems within the AFE time budget. The well was drilled with seawater and hi-vis pills down to 1195 m and with KCl / Glycol mud from 1195 m to TD. Good quality Hermod sands were encountered at 2018 m (1987 m TVD SS). Also the Heimdal and Ty Formation sands were present. However, no indications of hydrocarbons were found.No conventional core was cut in and no fluid samples were taken. The well was permanently abandoned as a dry well on 21 June 1997.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]1200.002560.00 -
Palynologiske preparater i Sokkeldirektoratet
Palynologiske preparater i Sokkeldirektoratet Prøve dybdeDybde enhetPrøve typeLaboratorie1200.0[m]DCRRI1230.0[m]DCRRI1250.0[m]DCRRI1270.0[m]DCRRI1290.0[m]DCRRI1310.0[m]DCRRI1330.0[m]DCRRI1370.0[m]DCRRI1380.0[m]DCRRI1400.0[m]DCRRI1420.0[m]DCRRI1430.0[m]DCRRI1992.0[m]SWCRRI2003.0[m]SWCRRI2007.0[m]SWCRRI2013.0[m]DCRRI2017.0[m]SWCRRI2069.0[m]DCRRI2105.0[m]SWCRRI2126.0[m]SWCRRI2142.0[m]SWCRRI2151.0[m]SWCRRI2159.0[m]SWCRRI2163.0[m]SWCRRI2172.0[m]SWCRRI2186.0[m]SWCRRI2211.0[m]SWCRRI2218.0[m]SWCRRI2236.0[m]SWCRRI -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet14949071671610631904190420022018212121762371251225122550 -
Spleisede logger
Spleisede logger Dokument navnDokument formatDokumentstørrelse [MB]pdf0.32 -
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk)
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk) Dokument navnDokument formatDokumentstørrelse [MB]pdf2.04pdf39.80 -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]CST19872236DSI DIT GR19322546MWD - DIR GR SN2311190MWD - DIR GR SN11901940MWD - DIR GR SN DEN NEU19402560VSP GR19322546 -
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 formasjonstestCONDUCTOR30226.036226.00.00LOTSURF.COND.13 3/81188.017 1/41190.01.90LOTINTERM.9 5/81931.012 1/41931.01.59LOTOPEN HOLE2560.08 1/22560.00.00LOT -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling1491.00SPUD MUD2221.00SPUD MUD5361.07SPUD MUD11881.20SPUD MUD11981.4542.0KCL/GLYCOL/GEM12001.07SPUD MUD12241.4539.0KCL/GLYCOL/GEM14521.3220.0KCL/GLYCOL/GEM19401.2015.0KCL/POLYMER22801.2011.0KCL/POLYMER25601.2112.0KCL/POLYMER