Optimisation of chemical systems for injection to enhance oil recovery
Abstract
The paper introduces an approach to optimise the concentration of chemicals in a mixture of alkaline - surfactant - polymer (ASP) and minimum injected pore volume by using response surface methodology. The study of recovery factor by flooding experiments showed the combination of C11-13 linear alkyl benzene sulfonate and dioctyl sulfosuccinate formed high solubilisation ratio (about 20%) in low salinity reservoir.
The minimum injected pore volume was analysed from flooding results of 10 Berea sandstone cores. The average oil saturation of cores was about 55% after water flooding. With the optimised mixture of ASP, the recovery increased significantly up to 85% when the injected pore volume rose from 0 to 0.2 pore volume. The process of optimising the ASP solution and the minimum injected volume would reduce costs for the tertiary stage and boost the recovery production.
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