Currently, twenty-four projects have been, or are being, waterflooded in the Pennsylvanian age Tyler Formation of Central Montana. The heterogeneous nature of the Tyler sandstone reservoir lends itself to quick injected water breakthrough, reservoir discontinuities, poor areal sweep efficiency, and considerable difficulity in geologic interpretation. Despite all the negative factors, the Tyler secondary projects have exhibited favorable results. This case study shows that reservoir quality plays an important role in realizing higher recovery efficiencies. An understanding of the nature of the beast is required in order to maximize the recoveries from the Tyler Formation. In addition, polymer augmented waterflooding provides a possible means of enhancing these projects.

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