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Modeling the impact of diesel vs. water overflush fluids on scale-squeeze-treatment lives using a two-phase near-wellbore simulator

Scale inhibitor squeeze treatments include an overflush to displace inhibitor into the formation to maximise adsorption. It was not realised by the industry before this work that an aqueous overflush also desorbs inhibitor that had adsorbed near the wellbore, displacing it further into the formation, where it re-adsorbs, improving retention and treatment life. However, a non-aqueous overflush does not bring about this benefit. As a result of this work, the industry recognised best practice is now to always include an aqueous component to the overflush; eg Saudi Aramco report one year improvement to treatment lifetime by adopting this practice (DOI:10.2118/141374-MS).