6407/8-1
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General information
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Wellbore history
GeneralWell 6407/8-1 is located north of the Njord Field and east of the Draugen Field. The objective of the well was to test an interpreted Late Jurassic submarine fan prospect within the Viking Group. If successful, the well would prove a new play fairway on the Halten Terrace. No additional targets had been mapped at the well location.Operations and resultsWell 6407/8-1 was spudded with the semi-submersible installation Ross Isle on 27 March 1992 and drilled to a total depth of 4650 m in the Middle Jurassic Melke Formation. A 9 7/8" pilot hole was drilled to 1100 m in the event of shallow gas. No gas was encountered. The well was opened up and drilled with seawater and hi-vis pills down to 1106 m and with gyp/polymer mud from 1106 m to TD.Top Viking Group was encountered at 4094 m, 30m shallower than prognosis. No major sandstone was penetrated at prospect level or within the Viking Group. Minor sandstone and limestone horizons were penetrated within the Upper Cretaceous (Lange Formation, Early Turonian). These horizons were hydrocarbon bearing, recorded on logs as well as in the form of oil shows. Due to bad hole conditions no wire line logs were run below 3491 m. MWD GR and resistivity logs were however run below this depth. No cores were cut and no fluid samples were taken. The well was permanently abandoned on 7 June 1992 as a dry well with showsTestingNo 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]1120.004650.00 -
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 typeINTERM.201105.0261114.01.84LOTINTERM.13 3/82469.017 1/22483.01.91LOTOPEN HOLE4650.012 1/24650.00.00LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CMT RET.995995CST GR25503328DLL SLS CAL GR SP11032476DLL SLS LDL CNL CAL GR19903489FERFORATING350350FPI33003300G-RING J-BASKET01000MWD - GR RES DIR3074650PERFORATING10001000SLS GR VDL10002469WSS CHECKSHOT6003350 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit3073071110119011901876187619312137213722832612287028704062409440944306 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.48 -
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]pdf11.52pdf1.77 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured6201.03WATER BASED10801.07WATER BASED11001.0748.0WATER BASED11111.2516.0WATER BASED13461.79WATER BASED15061.84WATER BASED17421.8453.0WATER BASED19081.6457.0WATER BASED20571.6455.0WATER BASED21941.6445.0WATER BASED22861.6044.0WATER BASED24221.6440.0WATER BASED24801.6415.0WATER BASED24831.6448.0WATER BASED26091.6053.0WATER BASED27171.6047.0WATER BASED28081.6044.0WATER BASED28291.6044.0WATER BASED28601.6040.0WATER BASED29181.6036.0WATER BASED29281.6037.0WATER BASED30001.6040.0WATER BASED30761.6044.0WATER BASED31571.6042.0WATER BASED32431.6039.0WATER BASED33421.6036.0WATER BASED34811.6040.0WATER BASED36561.6035.0WATER BASED36601.6241.0WATER BASED36731.7048.0WATER BASED37181.7344.0WATER BASED37981.7341.0WATER BASED38431.7341.0WATER BASED38471.7336.0WATER BASED39011.7338.0WATER BASED39441.7334.0WATER BASED39951.7337.0WATER BASED40001.8036.0OIL BASED40521.7330.0WATER BASED41091.7328.0WATER BASED41381.7330.0WATER BASED41591.7331.0WATER BASED42771.7333.0WATER BASED43491.7330.0WATER BASED44431.7337.0WATER BASED44681.7638.0WATER BASED45521.7636.0WATER BASED45941.7636.0WATER BASED46331.7638.0WATER BASED46501.8034.0OIL BASED