A new completion system has been developed which provides permanent and positive zone isolation and eliminates the need for remedial squeeze cementing. This system utilizes one or more long external casing packers that are positioned across the completion interval and inflated with cement during the primary cementing operation. Packer inflation exerts a hydraulic centralizing force on the packer mandrel to center it in the borehole and surrounds it with uncontaminated cement. As the packing element expands, it conforms to borehole irregularities. After the cement sets and the casing is drilled out, the packer(s) is(are) perforated and the zone(s) completed using normal completion practices with assurance that vertical fluid migration, via the casing-wellbore annulus, into or out of the perforated interval, is prevented.

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