Sensitivity Analysis of Different Parameters on Dissolution and Precipitation in Low Salinity Water Injection
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1Department of petroleum engineering, Amirkabir University of Technology, Research Institute of Petroleum Industry, Tehran, Iran
2Department of petroleum engineering, Amirkabir University of Technology, Tehran, Iran
Low Salinity Water injection (LSW) is a promising EOR method to improve the oil recovery for both sandstone and carbonate reservoirs. It has been observed that changing injection water composition (engineered water) and lowering water salinity are considered to improve the performance of water flood for carbonate reservoirs, by changing formation rock properties such as wettability alteration. Wettability alteration from oil wet to water wet is proven to be the main contributor to the incremental oil recovery when the salinity of the injection fluid is lowered. In this study, experiments are performed with diluted seawater and sear water contained different sulphate concentration to investigate the effect of changing injection brine physicochemical properties. Afterwards, it was history matched with the use of PHREEQC geochemical simulation software. The matched model was used to sensitivity analysis of different parameters such as calcium ion and magnesium ion concentration, alkalinity, salinity, temperature and the amount of carbonate material.
Low Salinity Water Flooding LSW; Wettability alteration; Geochemical Simulation; EOR; Equlibrium Concentration