Preparation and Performance Evaluation of High Strength Gel with High Temperature Resistance for Heavy Oil Thermal Recovery
Aiming to solve the problems of inter-well steam channeling in multi-cycle heavy oil thermal recovery reservoirs,a salt-tolerant copolymer containing acrylamide(AM),sodium acrylate(AANa)and 2-acrylamide-2-methylpropanesulfonic sodium(AMPSNa)structural unit was prepared.The high strength gel with excellent temperature resistant performances was formed by crosslinking with phenolic and organoaluminum derivatives,which realized the long-term plugging of steam channeling channel for heavy oil thermal recovery.The effects of different crosslinking agent systems on gel formation were studied by rheological method,and the field adaptation performance was evaluated.The results show that AM/AANa/AMPSNa copolymer was completely dissolved in 30 min in sewage with salinity lower than 25000 mg·L-1,without agglomeration and had good solubility.The high strength gel system can be formed at reservoir temperature of 60～90℃,and the dehydration rate is less than 10%in 30 days when the temperature is 150℃and the salinity is less than 25000 mg·L-1.The gel has good adaptability to sewage in field application and shows excellent long-term stability.
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