The influence of different ions on the performance of low salinity water flooding

Articles in Press

Document Type : Research Article

Authors

1 Department of Civil Engineering, Tafresh University, Tafresh 39518-79611, Iran.

2 Department of chemical Engineering, Tafresh university, Tafresh

Abstract

In the recent decade, low salinity water flooding attained remarkable attention as a pioneer method for recovery oil. However, this method has several risks. To decrease the potential risk of conflict between injected water and rock /brine/crude oil system, the ions concentrations in injection water should be optimized. In this work, injection water composition during low salinity water flooding in a core model of carbonate reservoirs was simulated based on maximizing wettability change and minimizing compatibility. The optimum ions concentrations in injection water were obtained from geochemical software (PHREEQC) which was coupled with ECLIPSE software and genetic algorithm. The optimum conditions of injection water were provided in low concentration of sodium ion (186 ppm) and high concentration of sulfate ion (7064 ppm). The optimization process based on genetic algorithm was stopped after 764 times running of scenarios. The average recovery factor was obtained near 0.141 and the results presented that average recovery factor was not dependent on calcium and chloride ions concentration ranges. Hence, these ions were not effective in optimization process. However, the average recovery factor had a strong relation on sodium and sulfate ions concentrations.

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Iranian Journal of Chemistry and Chemical Engineering

Articles in Press, Accepted Manuscript
Available Online from 02 January 2023

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