6507/11-7
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General information
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Wellbore history
GeneralWildcat well 6507/11-7 is located in the Grinda Graben, a major structural element in PL263 on the Halten Terrace off shore mid Norway. The primary objective of the well 6507/11-7 was to prove commercial hydrocarbon resources in the Late Cretaceous Zita prospect. The Zita prospect is a Lysing Formation reservoir in a stratigraphic trap model. A secondary objective of the well was to prove commercial hydrocarbon resources within the Late Cretaceous Zit-B prospect. The Zit-B prospect is an Upper Lange Fm reservoir in a stratigraphic trap model.Operations and resultsWell 6507/11-7was spudded with the semi-submersible installation Transocean Winner on 13 December 2006 and drilled to TD at 2950 m in Early Cretaceous (Late Albian) sediments of the Lange Formation. Spudding was made difficult by large boulders and unacceptable inclination in the first top hole led to a re-spud ca 15 m northwest of the original location. Otherwise operations proceeded without significant problems. The well was drilled with spud mud down to 535 m, with Polymer/KCl brine mud from 535 m to 2484 m, and with Ultradril mud from 2484 m to TD. The Ultra drill mud contains Ultrafree NS, which consists of C14-C16 linear alpha olefins.No hydrocarbons were proven in the well. Calcite cemented sand layers of Coniacian toTuronian age (Lysing Formation) were encountered in a 39 m thick interval (2777 - 2817 m). The stacked sand layers had very low porosities and permeability values, and was water wet. Formation pressure measurements showed higher pressure in the Lysing Formation sands in well 6507/11-7, than in the comparable down-dip Smørbukk S discovery in the Lysing Formation This indicated that the encountered sands were not in direct pressure communication with the Lysing Formation sands in the region. Post-well organic geochemical analyses of mud gas, cuttings and SWC's confirmed a dry well with no indication of migrated hydrocarbons.The formation evaluation programme for not making a discovery was carried through, comprising one run with wire line logging, MDT pressure point measurements and MSCT sidewall samples, in order to confirm the well results. No cores were taken, no VSP was gathered and no formation fluid sample was collected.The well was permanently abandoned on 12 February 2007 as a dry well.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]550.002950.00 -
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 typeCONDUCTOR30386.036387.00.00LOTSURF.COND.20532.026535.00.00LOTINTERM.13 3/81114.017 1/21115.01.22LOTINTERM.9 5/82478.012 1/42484.01.90LOTOPEN HOLE2950.08 1/22950.01.94LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]GR RES NEU DEN DIR APWD27532950MDT GR27832880MSCT GR27512885MWD - DIR320535MWD - GR RES DIR APWD5351115MWD - GR RES NEU DIR APWD SONIC11152484PEX HRLA DSI23292948 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit3203201408171017102052205221002158215822372513277727772817 -
Geochemical information
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Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured3901.05WATER BASED3901.05WATER BASED4211.05WATER BASED11151.1822.0WATER BASED15361.5837.0WATER BASED17091.6040.0WATER BASED21151.6036.0WATER BASED23151.6031.0WATER BASED24451.6036.0WATER BASED24841.6232.0WATER BASED