To obtain virgin reservoir data, Mobil North Sea Ltd. ran a memory production log while perforating a horizontal development well.
The well is in the Mobil-operated Nevis field, U.K. sector of the North Sea. Schlumberger Oilfield Services provided the logging and perforating services.
The logging tools were installed below 250 ft of coiled tubing-conveyed perforating guns. Schlumberger believes this to be the first log recorded under these conditions. Previous runs of the memory production log were done on wire line.
In the Nevis well, the downhole memory production logging string includes a tool manufactured by Schlumberger Lee Tool. Coiled tubing was provided by Schlumberger Dowell.
According to Schlumberger, the memory production log offers substantial savings in rig time, eliminates a separate production logging run, and provides an accurate reservoir measurement immediately after perforating the well.
Crawford Hair, senior staff operations engineer with Mobil, commented that the technique saved 1 day of rig time compared to running a stand-alone production log. Data quality was good, and met Mobil's expectations.
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