The Tensleep Formation in the Lost Soldier Field has been pattern waterflooded since 1976. Injection wells have historically exhibited large declines in injectivity which required frequent workovers. Since those declines were originally attributed to near-well damage from poor injection water quality, a cleanup program was initiated that significantly reduced the amount and size of suspended particles in the injection water. Despite the improvements, injectivity continued to decline in many of the wells. Subsequent analysis of well histories, PFOTs, and reservoir petrophysical properties suggest the reservoir damage in many instances was not only a sandface phenomena, but also caused by deep particle invasion. Workover procedures were altered to treat the formation beyond the near wellbore area resulting in increased injectivities when compared to the historical norm.

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