Analysis Behind Casing deployed in Norsk Hydro's Oseberg field

The ability to log wells from behind casing is a key addition to available formation evaluation services because it enables operators to assess bypassed zones, analyze time effects on producing intervals, and optimize well costs when well conditions are not suitable for open hole logging. Click here to enlarge imageNorsk Hydro ASA, operator of the Oseberg South field in the Norwegian Sea (Fig. 1), used analysis behind casing (ABC) services from Schlumberger to obtain log data in the T4 sidetrack of the well. Operational problems in the earlier sidetracks T2 and T3 had triggered the decision to run casing and secure the T4 immediately after reaching total depth (TD).Failures with the logg...

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