The current interpretation of gravel pack productivity decline seems to focus on dispersion and plugging with formation fines, especially after acidizing. This paper presents an alternate explanation. Gravel may be flushed from perforations during acidizing into acidized formation voids, gravel may move into acidized gravel pack voids in the screen-casing annulus during production start-up, or tunnel voids may have existed prior to acidizing as a result of poor gravel placement during gravel pack execution. Production start-up rate controls how formation sand enters partially filled voids after acidizing. A controlled production rate allows formation sand to enter the tunnel above the gravel so that a more conductive parallel alignment of sand and gravel in the tunnel is created.

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