Journal
GELS
Volume 8, Issue 6, Pages -Publisher
MDPI
DOI: 10.3390/gels8060362
Keywords
reinforced high-temperature gel; HPAM; water-soluble phenolic resin; nanoparticles; syneresis
Categories
Funding
- Major Scientific and Technological Projects of China National Petroleum Corporation (CNPC, China) [ZD2019-183-007]
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The properties of a reinforced gel with partially hydrolyzed polyacrylamide (HPAM), water-soluble phenolic resin (WSPR), and nano-SiO2 were evaluated. It was found that nano-SiO2 improved the dispersion of the polymer in water and enhanced the thermal stability of the gel, but oxidative degradation remained the main cause of early dehydration of the gel.
The properties of a reinforced gel with partially hydrolyzed polyacrylamide (HPAM) as the main agent, water-soluble phenolic resin (WSPR) as the crosslinker, and nano-SiO2 as the stabilizer were evaluated in terms of gelation time, gel strength and thermal stability under the conditions of 110 degrees C and 12.124 g/L salinity in water. The results showed that the gelation time of the gel with high strength was adjustable from 3 to 23 h, remaining stable for more than 180 days under stratigraphic conditions, although with a certain degree of early dehydration in the gel. Cryo-scanning electron microscopy (cryo-SEM) and dynamic light scattering (DLS) analysis revealed that nano-SiO2 improves the dispersion of the polymer in water, resulting in a more homogeneous structure of the formed gel and thus improving the strength of the gels. In addition, rheological tests and cryo-SEM showed that the interaction between nano-SiO2 and the polymer could inhibit the degradation of polymer to a certain extent and improve the thermal stability of the gel. However, the oxidative degradation of the gel is still the main cause of early dehydration of water-soluble phenolic resin gel, and the addition of a small amount of hydroquinone to the gelants can significantly improve the antioxidative degradation properties of phenolic resin gel.
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