期刊
PETROLEUM SCIENCE AND TECHNOLOGY
卷 34, 期 15, 页码 1345-1351出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/10916466.2016.1204316
关键词
Double layer; ions (SO42-, Mg2+, Ca2+); low-salinity water; nano-SiO2; wettability alteration
Wettability alteration in porous media is one of the mechanisms for enhancing oil recovery through injecting low-salinity water into carbonate reservoirs, in which active ions can remove the carboxylic oil component from the rock surface, altering the rock's wettability toward a water-wet condition. This study investigated the concomitant effects of low-salinity water and hydrophilic SiO2 nanoparticles on oil-wet dolomite rock. Results revealed that low-salinity water coupled with hydrophilic nano-SiO2 in oil-wet dolomite rock remarkably affected the wettability alteration of the rock, showing that the simultaneous presence of ions in water and hydrophilic nano-SiO2 led to considerable wettability alteration compared with using just low-salinity water.
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