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- W789508525 abstract "Water based EOR by wettability alteration is of interest among the oil companies because of economic and environmental reasons. It is well known that seawater acts as a wettability modifier in carbonate reservoirs, and the seawater can even be improved as a smart EOR fluid by removing Na+ and Cl− ions, and spiking this NaCl-depleted seawater with SO42- ions. In this paper we have addressed the degree of seawater modification needed to achieve reasonable improvements in oil recovery in spontaneous imbibition processes at 90 °C. Compared to ordinary seawater as imbibing fluid, more than 90% of the NaCl content must be removed in order to increase the oil recovery by 7–8% OOIP. Furthermore, compared to seawater depleted in NaCl, the oil recovery could be increased by 10% OOIP by spiking the NaCl depleted seawater with sulfate, 3–4 times the sulfate concentration present in seawater. The increased efficiency of modified seawater as a smart EOR fluid in carbonate is discussed in terms of a decrease in the ionic density of the double layer close to the positively charged calcite surface." @default.
- W789508525 created "2016-06-24" @default.
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- W789508525 date "2015-09-01" @default.
- W789508525 modified "2023-09-30" @default.
- W789508525 title "Modified seawater as a smart EOR fluid in chalk" @default.
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- W789508525 doi "https://doi.org/10.1016/j.petrol.2015.06.034" @default.
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