The precipitation of hydrated aluminum oxide from aqueous solutions can be controlled with reactions that change solution pH. Gels, fine grained precipitates and tightly adhering coatings can be readily produced within porous media to provide profile control. Substantial permeability reductions to over 99% were achieved with small amounts of gels not only in a 5 darcy sand, but also in relatively coarse 20/40 mesh glass beads and gravel. Laboratory results show the influence of injection volume and rate on overall permeability reduction. Profiles for permeability and gel content were also measured. Gel size distributions from static and plugging experiments show the development of sizes leading to effective control.

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