1/6-4
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General information
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Wellbore history
GeneralWell 1/6-4 was drilled in the southernmost part of the Breiflabb Basin in the North Sea. The objective was to evaluate a large low relief base Tertiary - Late Cretaceous structure with potential reservoirs both in the Danian - Late Cretaceous Chalk and in the Paleocene Sands. The primary target was the Chalk (Ekofisk and Tor formations).Operations and resultsWildcat well 1/6-4 was spudded with the semi-submersible installation Chris Chenery on 29 December 1975 and drilled to TD at 3810 m in the Late Cretaceous Tor Formation. The drilling of 1/6-4 was beset with rig mechanical problems, most notably failures in the mooring system induced by adverse North Sea weather. All in all 34 days (ca 33%) of the total rig time on the well was counted as down time. The well was drilled with bentonite/seawater spud mud down to 437 m and with lime/Drispac/seawater mud from 437 m to TD.Top Rogaland Group, Balder Formation, came in at 3110 m. A Paleocene sandstone, Andrew Formation was penetrated from 3197 to 3253 m. Top Shetland Group, Ekofisk Formation, came in at 3374 m. The Balder Formation (Tuff marker) had some residual hydrocarbons up to 30%. This was substantiated by gas readings and some shows of fluorescence in ditch cuttings. The underlying Andrew Formation sandstones were found 100% water-bearing. Both the Danian and Maastrichtian were fully water bearing based on petrophysical analyses. This was in agreement with the lack of oil/gas shows while drilling in this section.No cores were cut and no wire line fluid samples were taken.The well was permanently abandoned on 9 April 1978 as a dry well with shows.TestingNo drill stem test was performed. -
Cuttings at the Norwegian Offshore Directorate
Cuttings at the Norwegian Offshore Directorate Cuttings available for sampling?YESCuttings at the Norwegian Offshore Directorate Cutting sample, top depth [m]Cutting samples, bottom depth [m]192.003810.00 -
Casing and leak–off tests
Casing and leak–off tests Casing typeCasing diam.
[inch]Casing depth
[m]Hole diam.
[inch]Hole depth
[m]LOT/FIT mud eqv.
[g/cm3]Formation test typeCONDUCTOR30181.036187.00.00LOTINTERM.20429.026437.00.00LOTINTERM.13 3/81224.017 1/21232.00.00LOTINTERM.9 5/83272.012 1/43285.00.00LOTOPEN HOLE3810.08 1/23810.00.00LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]BGT5941431BGT14092947BHC GR14094036BHC GR CAL402310775BHC GR CAL1073612498DLL GR1073712484DLL SP402310765FDC CNL CAL402610776FDC CNL GR CAL1073712500IES GR402410778 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit10516333110311031243130319732533335337433743475 -
Geochemical information
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Documents – reported by the production licence (period for duty of secrecy expired)
Documents – reported by the production licence (period for duty of secrecy expired) Document nameDocument formatDocument size [MB]pdf1.62pdf25.70 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured1731.54seawt/bento4351.55seawt/bento12281.55seawt/bento32831.56seawt/lime38101.56seawt/lime -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory8000.0[ft]DCRRI8060.0[ft]DCRRI8120.0[ft]DCRRI8180.0[ft]DCRRI8240.0[ft]DCRRI8300.0[ft]DCRRI8360.0[ft]DCRRI8420.0[ft]DCRRI8480.0[ft]DCRRI8540.0[ft]DCRRI8600.0[ft]DCRRI8620.0[ft]DCRRI8660.0[ft]DCRRI8680.0[ft]DCRRI8720.0[ft]DCRRI8740.0[ft]DCRRI8780.0[ft]DCRRI8800.0[ft]DCRRI8840.0[ft]DCRRI8860.0[ft]DCRRI8900.0[ft]DCRRI8920.0[ft]DCRRI8960.0[ft]DCRRI8980.0[ft]DCRRI9020.0[ft]DCRRI9040.0[ft]DCRRI9080.0[ft]DCRRI9100.0[ft]DCRRI9140.0[ft]DCRRI9160.0[ft]DCRRI9200.0[ft]DCRRI9220.0[ft]DCRRI9260.0[ft]DCRRI9270.0[ft]DCRRI9320.0[ft]DCRRI9330.0[ft]DCRRI9380.0[ft]DCRRI9410.0[ft]DCRRI9450.0[ft]DCRRI9480.0[ft]DCRRI9500.0[ft]DCRRI9520.0[ft]DCRRI9560.0[ft]DCRRI9600.0[ft]DCRRI9620.0[ft]DCRRI9680.0[ft]DCRRI9700.0[ft]DCRRI9740.0[ft]DCRRI9760.0[ft]DCRRI9800.0[ft]DCRRI9840.0[ft]DCRRI9860.0[ft]DCRRI9920.0[ft]DCRRI9960.0[ft]DCRRI9980.0[ft]DCRRI10020.0[ft]DCRRI10040.0[ft]DCRRI10080.0[ft]DCRRI10140.0[ft]DCRRI10180.0[ft]DCRRI10200.0[ft]DCRRI10220.0[ft]DCRRI10260.0[ft]DCRRI10300.0[ft]DCRRI10320.0[ft]DCRRI10340.0[ft]DCRRI10380.0[ft]DCRRI10400.0[ft]DCRRI10440.0[ft]DCRRI10450.0[ft]DCRRI10500.0[ft]DCRRI10510.0[ft]DCRRI10560.0[ft]DCRRI10600.0[ft]DCRRI10620.0[ft]DCRRI10670.0[ft]DCRRI10680.0[ft]DCRRI10720.0[ft]DCRRI10730.0[ft]DCRRI10770.0[ft]DCRRI10790.0[ft]DCRRI10820.0[ft]DCRRI10850.0[ft]DCRRI10900.0[ft]DCRRI10910.0[ft]DCRRI10960.0[ft]DCRRI10970.0[ft]DCRRI11020.0[ft]DCRRI11030.0[ft]DCRRI11080.0[ft]DCRRI11090.0[ft]DCRRI11150.0[ft]DCRRI11220.0[ft]DCRRI11280.0[ft]DCRRI11340.0[ft]DCRRI11410.0[ft]DCRRI