wettability alteration of sandstone and carbonate rocks by using zno nanoparticles in heavy oil reservoirs
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abstract
efforts to enhance oil recovery through wettability alteration by nanoparticles have been attracted inrecent years. however, many basic questions have been ambiguous up until now. nanoparticlespenetrate into pore volume of porous media, stick on the core surface, and by creating homogeneouswater-wet area, cause to alter wettability. this work introduces the new concept of adding znonanoparticles by an experimental work on wettability alteration and oil recovery through spontaneousimbibition mechanism. laboratory tests were conducted in two experimental steps on four cylindricalcore samples (three sandstones and one carbonate) taken from a real iranian heavy oil reservoir inamott cell. in the first step, the core samples were saturated by crude oil. next, the core samples wereflooded with nanoparticles and saturated by crude oil for about two weeks. then, the core sampleswere immersed in distilled water and the amount of recovery was monitored during 30 days for bothsteps. the experimental results showed that oil recovery for three sandstone cores changed from20.74, 4.3, and 3.5% of original oil in place (ooip) in the absence of nanoparticles to 36.2, 17.57, and20.68% of ooip when nanoparticles were added respectively. moreover, for the carbonate core, therecovery changed from zero to 8.89% of ooip by adding nanoparticles. by the investigation ofrelative permeability curves, it was found that by adding zno nanoparticles, the crossover-point ofcurves shifted to the right for both sandstone and carbonate cores, which meant wettability was alteredto water- wet. this study, for the first time, illustrated the remarkable role of zno nanoparticles inwettability alteration toward more water-wet for both sandstone and carbonate cores and enhancingoil recovery.
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Journal title:
iranian journal of oil & gas science and technologyPublisher: petroleum university of technology
ISSN 2345-2412
volume 4
issue 4 2016
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