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Ion Modified Water Flooding in Low-Permeable Carbonates of Bashkirsky Formation in Russia-Tatarstan

Summary In this work we studied the effect of ion modified water on recovery factor and injectivity of the Bashkisky formation. For preparation of ion modified water added 5g magnesium sulfate to 100g fresh water. In order to define the effectiveness of ion modified water injection, the oil saturated cores were flooded by fresh water and when water-cut reached 100%, we replaced it with ion modified water. According to the results, recovery factor for fresh water was about 9.5% and pressure drop during injection was 232 kPa. By replacing fresh water with ion modified water recovery factor increased up to 14.5% and pressure drop decreased down to 136 kPa. Flooding simulation showed that by adding magnesium ions to fresh water, scale tendency of CaCO3 salt decreased from 22 to 1.2.