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论文类型：期刊论文
发表时间：2017-09-01
发表刊物：JOURNAL OF MOLECULAR LIQUIDS
收录刊物：SCIE、EI、Scopus
卷号：241
页面范围：1069-1078
ISSN号：0167-7322
关键字：Foam stability; Oil-water emulsion; Mixed polymer/surfactant emulsifier; Silica nanoparticles; Equilibrium surface tension; Bubble size
摘要：The foam stability of oil-water emulsions stabilised by various surface-active components at high temperature is one of the major problems facing foam-flooding petroleum recovery because of foam instability at the high temperature underground. In this paper, foams stabilised by sodium dodecylbenzene sulfonate (SDBS), polyethylene glycol (PEG) and silica (SiO2) nanoparticles in water-liquid paraffin (50%/50%) emulsions at temperature from 20 to 80 degrees C were studied. Foam properties such as foam stability over time at different temperatures, equilibrium surface tension, and bubble morphology (bubble size) were determined by surface tension measurements and inverted fluorescence microscopy. High foam stability was demonstrated by emulsions of SDBS, PEG, SiO2 nano particles, and liquid paraffin from 40 to 80 degrees C. The properties of the PEG-SDBS foams improved when SiO2 nano particles were added. Foam stability increased when SDBS was adsorbed on the bubble surface as the bubbles did not rupture easily in the liquid phase in the presence of SDBS because of the formation of closely packed small bubble droplets bridging between neighbouring large bubbles, which were separated by long chain polymers. This phenomenon may arise because the SiO2 nanoparticles formed networks and were adsorbed with surfactant molecules on the bubble surface of the oil-water emulsion, causing the foam inflexibility to increase and thus improving aqueous foam stability at high temperature. (C) 2017 Published by Elsevier B.V.