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There exist several mentions (Qi et al., 2016; Vermolen et al., 2014; Wang et al., 2013) of hydrolyzed acrylamide (HPAM) polymers leading to reduced end point residual oil saturation, SOR, relative to water floods. Observed lowering of SOR is commonly referred to as “viscoelastic effect”, but literature results are scattered when it comes to identifying a significant and reproducible impact. This...
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