1/6-7
Eksport: PDF
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Generell informasjon
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Brønnhistorie
GeneralWell 1/6-7 is located in the Feda Graben of the North Sea, approximately mid-way between the Albuskjell and Tommeliten Gamma fields. It was drilled on the flank of a salt diapir. The primary objective of the well was to test the hydrocarbon potential of Late Jurassic sandstones. Two secondary objectives were identified; to test for hydrocarbons in the Cretaceous Chalk and to test for the development and the hydrocarbon potential of Paleocene sands.Operations and resultsWildcat well 1/6-7 was spudded with the semi-submersible installation West Vanguard on 16 March 1992 and drilled to TD at 4995 m (5001 m logger's depth / 4925 m TVD). A 9 7/8" pilot hole was drilled from 170 to 1007m prior to the 26" section to check for possible shallow gas at 311, 351, and 397 m. No shallow gas was seen. MWD check-shots inside the 20" casing (azimuth unreliable) proved that the well had sidetracked in the 26" hole. In the 12 1/4" hole a steerable assembly was run in hole to correct the course. This twisted off, leaving a fish at 3740 m. The well was plugged back to 3550 m and the well was sidetracked from 3650 m. After the sidetrack the azimuth stayed fairly constant in a northwest direction. The inclination, though, increased. In the 12 1/4" hole from 3515 m to 4329 m the angle built from 3.73deg to 13.52deg. The angle kept building in the 8 1/2" hole until a maximum MWD survey of 31.40deg at 4701m. At this depth the bit was pulled out of the hole for an intermediate logging run and to change the BHA to an angle dropping assembly. This assembly dropped the inclination to 24.7deg by TD. At 4878 m, in the top of Sandstone Unit II, a salt water kick was taken. The well was drilled with seawater with viscous pre-hydrated bentonite sweeps down to 1007 m, with inhibitive polymer mud system utilizing WBS-200 wellbore stabilizer to from 1007 m to 1400 m, with PHPA inhibitive polymer mud from 1400 m to 3273 m, and with high temperature polymer system mud from 3273 m to TD.Weak to fair shows in the claystone and limestone were seen in several intervals from 2680 to 2950 m (Hordaland Group), and free tarry oil in the mud was observed from 2912 - 2945 m (claystone with stringers of limestone and dolomite). The tarry oil was described as dark brown to black, with a resinous lustre, orange to yellow direct fluorescence, moderate to fast streaming yellowish cut and had a dark brown residue. The Chalk objective was drilled outside of structural closure and top Ekofisk Formation was penetrated at 3278 m (3275 m TVD). Moderate shows were described here in a zone from 3288 to 3293 m with weaker shows continuing down into core #1, and on cuttings further down to 3420 m. The electrical logs indicate an average porosity of 17.5% in this zone. BCU (top Mandal Formation) was penetrated at 4402.5 m (4388.6 m TVD). Two sandstone units of Oxfordian age, Sandstone Unit II (4750 - 4788 m / 4706.4 - 4739.7 m TVD) and Unit I (4879 - 4977 m / 4820 - 4907.5 m TVD) were penetrated. Average porosities of the Units were 16.1 and 21.5 % respectively. Shows in Sandstone Unit II (4750-4788m, Core #2 and #3) were described as very weak to no direct fluorescence, slow even bluish white crush cut, and faint creamy residue fluorescence. Shows in Sandstone Unit I (4879 - 4977 m) appeared with no fluorescence, no cut, minor traces of slow even bluish white crush cut and traces of creamy residue fluorescence. The cuttings in this unit had a good gas odour.Three cores were cut with 100, 94.7, and 98.5% recovery, respectively. The first core was cut in the upper part of the Ekofisk Formation (3295 m - 3313.9, m) and the next two in the Haugesund Formation (4754 - 4773 m and 4773 - 4800.57 m respectively) in Sandstone Unit II and into the underlying shale. In order to match the gamma ray log cores #1, #2, and #3 has to be shifted + 1.2 m, +6.5 m, and +5.5 m, respectively. A total of 10 FMT pressure tests and one fluid sample were taken in Sandstone Unit I. Calculated pressure gradient in this sandstone is 0.52 psi/ft (0.12 Bar/m). The fluid sample, at 4884 m, contained water and mud filtrate only.The well was permanently abandoned on 12 July 1992 as a dry well with shows.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]1010.004993.00 -
Borekjerner i Sokkeldirektoratet
Borekjerner i Sokkeldirektoratet Kjerneprøve nummerKjerneprøve - topp dybdeKjerneprøve - bunn dybdeKjerneprøve dybde - enhet13295.03313.8[m ]24754.04772.0[m ]34773.04800.6[m ]Borekjerner i Sokkeldirektoratet Total kjerneprøve lengde [m]64.4Borekjerner i Sokkeldirektoratet Kjerner tilgjengelig for prøvetaking?YES -
Kjernebilder
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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 formasjonstestCONDUCTOR30165.036167.00.00LOTINTERM.201000.6261002.01.81LOTINTERM.13 3/83261.017 1/23263.01.98LOTINTERM.9 7/84346.812 1/44348.00.00LOT -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]CSG CAL04025DAC GR10003270DAC GR32624307DAC GR42634965DIFL AC GR49305000DIFL AC GR SP43504965DIFL AC ZDL CN GR10053273DIFL ZDL CN SP GR32624358DIP GR16003274DIP GR32624360DIP GR43504969DIP GR46505001DLL MLL AC GR4201100DLL MLL AC GR32624361DLL MLL GR43504968FMT46634950GR AC ZDL901001MWD - DPR RAW924995SBT26833460SWC13553265SWC32804318SWC43654995SWC44654988VSP10104340VSP42505000ZDL CN GR43504970ZDL CN GR48205000 -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet921792306930693080308631683237324932783278338936654146416242914291433643644402440244484655 -
Spleisede logger
Spleisede logger Dokument navnDokument formatDokumentstørrelse [MB]pdf1.11 -
Geokjemisk informasjon
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Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk)
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk) Dokument navnDokument formatDokumentstørrelse [MB]pdf3.11pdf54.72 -
Dokumenter – eldre Sokkeldirektoratets WDSS rapporter og andre relaterte dokumenter
Dokumenter – eldre Sokkeldirektoratets WDSS rapporter og andre relaterte dokumenter Dokument navnDokument formatDokumentstørrelse [MB]pdf0.62pdf0.21 -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling961.04200.0WATER BASED1651.0480.0WATER BASED3111.04300.0WATER BASED7351.0428.0WATER BASED7731.04200.0WATER BASED9031.7150.0WATER BASED10031.4395.0WATER BASED10071.1145.0WATER BASED10101.2572.0WATER BASED12801.4581.0WATER BASED14001.5967.0WATER BASED14901.63115.0WATER BASED16801.6384.0WATER BASED18121.6369.0WATER BASED19521.6372.0WATER BASED21001.6365.0WATER BASED21901.6368.0WATER BASED23961.6378.0WATER BASED24141.6375.0WATER BASED25081.6582.0WATER BASED26401.6668.0WATER BASED28021.6784.0WATER BASED29201.6789.0WATER BASED29921.6892.0WATER BASED30791.6783.0WATER BASED31321.67100.0WATER BASED31571.71103.0WATER BASED32241.7180.0WATER BASED32731.6543.0WATER BASED32751.6151.0WATER BASED33351.5646.0WATER BASED34271.5648.0WATER BASED35071.5648.0WATER BASED35501.4767.0WATER BASED35921.4747.0WATER BASED36131.4752.0WATER BASED36251.4749.0WATER BASED36491.4748.0WATER BASED36531.4651.0WATER BASED36551.4755.0WATER BASED36731.4748.0WATER BASED37701.4745.0WATER BASED38271.4746.0WATER BASED39161.4739.0WATER BASED39991.5338.0WATER BASED40591.5344.0WATER BASED41011.5344.0WATER BASED42002.1255.0WATER BASED42231.5337.0WATER BASED42811.5337.0WATER BASED42892.1259.0WATER BASED43311.5337.0WATER BASED43581.5743.0WATER BASED44411.9241.0WATER BASED45261.9742.0WATER BASED46131.9746.0WATER BASED46912.0052.0WATER BASED47102.0050.0WATER BASED47542.0050.0WATER BASED47732.0058.0WATER BASED48012.0058.0WATER BASED49952.1260.0WATER BASED -
Palynologiske preparater i Sokkeldirektoratet
Palynologiske preparater i Sokkeldirektoratet Prøve dybdeDybde enhetPrøve typeLaboratorie3142.0[m]DCRRI3151.0[m]DCRRI3160.0[m]DCRRI3169.0[m]DCRRI3181.0[m]DCRRI3190.0[m]DCRRI3196.0[m]DCRRI3199.0[m]DCRRI3211.0[m]DCRRI3220.0[m]DCRRI3232.0[m]DCRRI3241.0[m]DCRRI3250.0[m]DCRRI3262.0[m]DCRRI3272.0[m]DCRRI3277.0[m]DCRRI3280.0[m]DCRRI4402.0[m]DCPETROSTR4411.0[m]DCPETROS4420.0[m]DCPETROS4429.0[m]DCPETROS4438.0[m]DCPETROS4447.0[m]DCPETROS4456.0[m]DCPETROS4465.0[m]DCPETROS4474.0[m]DCPETROS4483.0[m]DCPETROS4492.0[m]DCPETROS4501.0[m]DCPETROS4510.0[m]DCPETROS4519.0[m]DCPETROS4528.0[m]DCPETROS4537.0[m]DCPETROS4549.0[m]DCPETROS4555.0[m]DCPETROS4564.0[m]DCPETROS4573.0[m]DCPETROS4582.0[m]DCPETROS4591.0[m]DCPETROS4600.0[m]DCPETROS4609.0[m]DCPETROS4621.0[m]DCPETROS4627.0[m]DCPETROS4636.0[m]DCPETROS4645.0[m]DCPETROS4654.0[m]DCPETROS4663.0[m]DCPETROS4672.0[m]DCPETROS4681.0[m]DCPETROS4690.0[m]DCPETROS4699.0[m]DCPETROS4708.0[m]DCPETROS4717.0[m]DCPETROS4726.0[m]DCPETROS4735.0[m]DCPETROS4744.0[m]DCPETROS4756.5[m]CPETROS4762.4[m]CPETROS4769.0[m]CPETROS4773.7[m]CPETROS4777.2[m]CPETROS4781.2[m]CPETROS4783.8[m]CPETROS4789.6[m]CPETROS4795.9[m]CPETROS4798.7[m]CPETROS4807.0[m]DCPETROS4816.0[m]DCPETROS4825.0[m]DCPETROS4834.0[m]DCPETROS4846.0[m]DCPETROS4855.0[m]DCPETROS4864.0[m]DCPETROS4873.0[m]DCPETROS4882.0[m]DCPETROS4891.0[m]DCPETROS4903.0[m]DCPETROS4909.0[m]DCPETROS4918.0[m]DCPETROS4927.0[m]DCPETROS4936.0[m]DCPETROS4942.0[m]DCPETROS4954.0[m]DCPETROS4963.0[m]DCPETROS4978.0[m]DCPETROS4987.0[m]DCPETROS4990.0[m]DCPETROS