Synthesis, Optimization, and Characterization of Fluorescent Particle Preformed Gel

NanJun Lai (), Dongdong Wang, Junqi Wang and Lei Tang
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NanJun Lai: College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, China
Dongdong Wang: College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, China
Junqi Wang: The Key Laboratory of Well Stability and Fluid & Rock Mechanics in Oil and Gas Reservoir of Shaanxi Province, Xi’an Shiyou University, Xi’an 710312, China
Lei Tang: Sichuan Ruidong (China) Technology Co., Ltd., Dongguan 518111, China

Energies, 2022, vol. 15, issue 22, 1-22

Abstract: Performed gels are widely used in fields to support profile modification and Enhance Oil Recovery. Previous studies of profile modification of performed gels mainly used the index of pressure, resistance factor, or residual resistance factor to represent their ability. However, there is a lack of methods available to directly study their modification ability. In this article, the preformed gels with fluorescence properties, CQDs@PPG, would provide a new way to explore the profile modification of preformed gels. This paper uses poly (acrylamide, sodium p-styrene sulfonate), carbon quantum dots, and N,N-methylenebisacrylamide to prepare the CQDs@PPG via inverse emulsion polymerization. The morphology, size distribution, structure, fluorescence characteristics, surface potential thermal stability, viscosity changes, and viscoelastic properties of CQDs@PPG were analyzed. Moreover, the fluorescence properties of CQDs@PPG under different temperature, salinity, and pH were examined. Results indicate that the CQDs@PPG have excellent stability and that pH and salinity have little influence on their fluorescence properties. Further, only the temperature would affect the fluorescence properties of CQDs@PPG, but that effect is reversible after the temperature drops. By examining the fluorescence intensity, it would be more direct for researchers to study the profile modification in further experiments.

Keywords: carbon quantum dots; preformed particle gels; fluorescent microspheres; PPG characterization (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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