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Performance of low-salinity water flooding for enhanced oil recovery improved by SiO_2 nanoparticles

Petroleum Science 2019年第2期16卷 357-365页

作者： Tangestani Ebrahim Vafaie Sefti Mohsen Shadman Mohammad Mahdi Kazemi Tooseh Esmaeel Ahmadi Saeb Chemical Engineering Department Tarbiat Modares University

low-salinity water injection has been utilized as a promising method for oil recovery in recent years. low-salinity water flooding changes the ion composition or brine salinity for improving oil recovery. Recently, the application of nanoparticles with low-salinity water flooding has shown remarkable results in enhanced oil recovery(EOR). Many studies have been performed on the effect of nanofluids on EOR mechanisms. Their results showed that nanofluids can improve oil recovery when used in low-salinity water flooding. In this work, the effects of injection of low-salinity water and low-salinity nanofluid(prepared by adding SiO_2 nanoparticles to low-salinity water) on oil recovery were investigated. At first, the effects of ions were investigated with equal concentrations in low-salinity water flooding. The experimental results showed that the monovalent ions had better performance than the divalent ions because of them having more negative zeta potential and less ionic strength. Also, low-salinity water flooding recovered 6.1% original oil in place(OOIP) more than the high-salinity flooding. Contact angle measurements demonstrated that low-salinity water could reduce the contact angle between oil and water. Then in the second stage, experiments were continued by adding SiO_2 nanoparticles to the K+ solution which had the highest oil recovery at the first stage. The experimental results illustrated that the addition of Si02 nanoparticles up to 0.05 wt% increased oil recovery by about 4% OOIP more than the low-salinity water flooding.

关键词： Enhanced oil recovery low-salinity water low-salinity nanofluid Zeta potential

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How much would silica nanoparticles enhance the performance of low-salinity water flooding?

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Petroleum Science 2019年第3期16卷 591-605页

作者： Amir Hossein Saeedi Dehaghani Reza Daneshfar Department of Petroleum Engineering Faculty of Chemical Engineering Tarbiat Modares University Jalal Ale Ahmad Highway Gisha Bridge Tehran Iran Department of Petroleum Engineering Ahwaz Faculty of Petroleum Engineering Petroleum University of Technology (PUT) Ahwaz Iran

Nanofluids and low-salinity water(LSW)flooding are two novel techniques for enhanced oil *** some efforts on investigating benefits of each method,the pros and cons of their combined application need to be *** work sheds light on performance of LSW augmented with nanoparticles through examining wettability alteration and the amount of incremental oil recovery during the displacement *** this end,nanofluids were prepared by dispersing silica nanoparticles(0.1 wt%,0.25 wt%,0.5 wt% and 0.75 wt%)in 2,10,20 and 100 times diluted samples of Persian Gulf *** angle measurements revealed a crucial role of temperature,where no wettability alteration occurred up to 80 ℃.Also,an optimum wettability state(with contact angle 22°)was detected with a 20 times diluted sample of seawater augmented with 0.25 wt% silica ***,extreme dilution(herein 100 times)will be of no *** micromodel flooding,it was found that in an oil-wet condition,a combination of silica nanoparticles dispersed in 20 times diluted brine had the highest displacement efficiency compared to silica nanofluids prepared with deionized ***,by comparing oil recoveries in both water-and oil-wet micromodels,it was concluded that nanoparticles could enhance applicability of LSW via strengthening wettability alteration toward a favorable state and improving the sweep efficiency.

关键词： low-salinity water Silica nanoparticles low-salinity nanofluid Micromodel Enhanced oil recovery Wettability alteration

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Preliminary discussion of low-salinity hydrothermal fluid mineralization

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Chinese Science Bulletin 1999年第S2期44卷 141-143页

作者： ZHENG Mianping R & D Center of Saline Lake and Epithermal Deposits, Chinese Academy of Geological Sciences, Beijing 100037, China R and D Center of Saline Lake and Epithermal Deposits Chinese Academy of Geological Sciences Beijing 100037 China

REVIEWING the history of the geology of mineral deposits, we may find that in the first fifty years of thetwentieth century the magmatic-hydrothermal theory of ore deposition was the most prevalent, whichgave impetus to the development of the geology of mineral deposits. In the 1960s, the drilling of theSalton Sea geothermal field, California, the United States, and discovery and study of the Red Sea seafloor hot brines and large amounts of metal sulfides removed therefrom led to the rise of the brine theory ofmineral deposition, thus elucidating the origin of massive metal sulfides and promoted the discoveryand exploration of metal deposits. After the 1970s and the 1980s, through a study of the hydrothermal ore fluids of modern hotsprings. geologists came to realize that there exist low-salinity hydrothermal ore fluids other than

关键词： low-salinity hydrothermal fluid mineralization.

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