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• W2989820719 endingPage "1683" @default.
• W2989820719 startingPage "1683" @default.
• W2989820719 abstract "Owing to the harsh downhole environments, poor dispersion of silica at high salinity and high temperature can severely restrict its application as the nano-plugging agent in shale gas exploitation. The objective of this study is to improve salt tolerance and thermal stability of silica. Herein, silica was successfully functionalized with an anionic polymer (p SPMA) by SI-ATRP (surface-initiated atom transfer radical polymerization), named SiO2-g-SPMA. The grafted pSPMA brushes on silica provided sufficient electrostatic repulsion and steric repulsion for stabilizing silica in a harsh environment. The modified silica (SiO2-g-SPMA) had excellent colloidal stability at salinities up to 5.43 M NaCl (saturated brine) and standard API brine (8 wt% NaCl + 2 wt% CaCl2) for 30 days at room temperature. Simultaneously, the SiO2-g-SPMA was stable at 170 °C for 24 h as well as stable in weakly alkali environment. Furthermore, the plugging performance of SiO2-g-SPMA in water-based drilling fluids for low permeate reservoir reached to 78.25% when adding a small amount of 0.5 wt% SiO2-g-SPMA, which effectively hindered the water invasion into formation and protected the reservoir." @default.
• W2989820719 created "2019-12-05" @default.
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• W2989820719 date "2019-11-25" @default.
• W2989820719 modified "2023-10-01" @default.
• W2989820719 title "Ultra-Stable Silica Nanoparticles as Nano-Plugging Additive for Shale Exploitation in Harsh Environments" @default.
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• W2989820719 doi "https://doi.org/10.3390/nano9121683" @default.
• W2989820719 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6955846" @default.
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• W2989820719 hasPublicationYear "2019" @default.
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