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Enhanced oil recovery at the mature oilfields can be achieved by chemical flooding with use of surfactants on surfactant-polymer (SP) or alkali-surfactant-polymer technology 1, 2. A surfactant as part of a flooding composition allows you to change the wettability of the rock, reduce interfacial tension, increase the capillary number, and form an oil emulsion which provides a significant increase in the efficiency of oil displacement 3. The polymer included in the oil-displacing composition increases its viscosity and allows the displacement front aligning by improving the ratio of the mobilities of the oil and water phases 4, 5. The design of chemical flooding is carried out considering the geological and physical characteristics of the formation and the composition of formation fluids. When choosing an oil-displacing composition for a specific field, it is important to reliably assess the effectiveness of chemical flooding and predict a possible increase in oil recovery. This paper evaluates the effectiveness of SP flooding options by combining comprehensive laboratory studies and hydrodynamic modeling based on them.
Adakhovskiy et al. (Mon,) studied this question.
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