A successful technique for placing accurate amounts of sand inside casing was developed for the Western Operating Area (WOA) of the Prudhoe Bay Unit (PBU) on the North Slope of Alaska. Using coiled tubing and a multistage pumping schedule, a sand plug can be laid in one, time-saving operation.

The experience gathered from more than 100 field operations performed in the WOA during 1991 and 1992, in varying downhole conditions, provided for the refinement of the operational steps; allowing the first and each succeeding stage to be adjusted, in situ, for the manner in which the sand plug ‘behaved’ as it was placed.

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