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• W1981567478 abstract "Abstract Surfactant flooding processes become challenging in hard brines and/or at high temperatures. When hard brine is used as surfactant make-up brine (injection brine), chemical adsorption is high using conventional injection strategies. This makes the overall process performance limited. High temperature (&gt;80°C) raises thermal stability issues with subsequent loss of effectiveness. This paper illustrates recent progresses achieved in those difficult conditions. We show that good performances can be obtained by combining appropriate formulations with adapted injection strategies, i.e. slugs design, depending on reservoir conditions. A particular emphasis is set on solutions that can be applied in the field. High performances solutions first rely on selecting appropriate surfactants and polymers from an extended portfolio of industrial products. We demonstrate that ultra-low interfacial tension formulations can be successfully designed for a wide range of conditions, i.e. from mild to difficult conditions, including very hard brines, very high salinities (&gt;200 g/L) and/or high temperatures (up to 120°C). Various coreflood experiments are then reviewed to define guidelines to address challenging conditions: Starting from mild conditions, i.e. soft brine at moderate temperature, we show that performance of surfactant flooding relies on the combination of properly designed chemical formulation and appropriate injection strategy. In soft brine, a salinity gradient is shown to provide high performance; In hard brines, surfactant adsorption is significantly higher than in soft brines. We demonstrate that a conventional salinity gradient injection strategy becomes ineffective when hardness is increased. Surfactant adsorption is drastically reduced (&lt;0.2 mg/g) when using appropriate adsorption inhibitors. This results in a very high oil recovery (~90 %ROIP) with performances comparable to the one achieved in soft brine conditions; For high temperatures (&gt;70–80°C), adapted protocols are required to address thermal stability issues and subsequent loss of performances. New surfactants, polymers and additives are available to address these conditions. Successful oil recovery experiments done up to 120°C are discussed. The paper will demonstrate how surfactant flooding can be successfully applied in challenging reservoir conditions opening new opportunities for chemical EOR." @default.
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• W1981567478 date "2013-03-10" @default.
• W1981567478 modified "2023-10-18" @default.
• W1981567478 title "Surfactant Flooding in Challenging Conditions: Towards Hard Brines and High Temperatures" @default.
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• W1981567478 doi "https://doi.org/10.2118/164359-ms" @default.
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