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X reservoir is a high temperature (97 ?), high salinity (TDS 204600 mg/L, divalent cation 11480.34 mg/L), middle-low permeability sandstone reservoir located in Tarim Basin (China). Serious vertical and lateral heterogeneity of formations resulted in the injection water channeling from higher permeability pathways. The harsh conditions make it difficult to further improve oil recovery. This paper provides a micro-scale preformed particle gels (micro-PPG)/surfactant EOR process for X reservoir. The micro-PPG with a...