Under the conditions of 110℃ and 12,124 mg/L salt content in water,the gelation laws of HPAM,AM-AMPS(AMPS content 30%),and water-soluble phenolic resin were studied from the three aspects:gelling time,gelling strength and gelling stability.The results show that the gelation law is related to the amount of polymer,cross-linking agent,and the polymer's molecular structure.When the amount of polymer and cross-linking agent in the gellant is the same,the gelation time of HPAM is significantly lower than that of AM-AMPS,and the gel strength is higher than that of AM-AMPS.The gel formed by different polymers and water-soluble phenolic resins all had the phenomenon of early dehydration,the long-term thermal stability of the phenolic resin gel formed by AM-AMPS is worse than that of HPAM.Cryo-scanning electron microscope(Cryo-SEM)analysis shows that the cross-link density is an important factor affecting the strength and stability of the gel;X-ray photoelectron spectroscopy(XPS)and Infrared spectroscopy(IR)analysis show that the oxidative degradation of the gel causes the early dehydration of the phenolic resin gel.Adding a small amount of hydroquinone to the gellant can significantly improve the stability of the phenolic resin gel.The research results can guide the development of high-temperature gel.
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