Abstract
The high permeability channels would reduce the ultimate oil production resulting from excess water flooding. The objective of this paper is to prepare and evaluate a novel tough gel that can be used to significantly reduce the permeability of the fluid channels. We synthesized the hydrophobic associated hydrogel composed of poly(acrylamide-co-diacryl quaternary ammonium salts) (G(AM/DiAC)) by simple aqueous solution copolymerization method. Here, three diacryl quaternary ammonium salts are cation surfmer with different alkyl lengths (DiAC, carbon chain length = 6, 8, 10, respectively). The gel properties, including the mechanical performance and swelling property, as well as its influencing factors were investigated. The results showed that G(AM/DiAC) hydrogel has excellent mechanical properties. It was found that its mechanical properties were dependent on the alkyl length and dosage of surfmer. When carbon chain of DiAC was C8 and the dosage of DiAC8 reached 0.5 mol%, G(AM/DiAC8) hydrogel showed the most excellent mechanical performance (tensile strengths = 58.97 kPa, elongation-at-break = 3712% and compressive strengths = 100.01 kPa). The toughness mechanism derived from the increase in the sequence length and number of hydrophobic micro-blocks in the molecular chains of hydrogels. Furthermore, the hydrogels exhibited slow swelling property, in favor of deep migration and plugging high permeable layer. The swelling equilibrium time of hydrogels was prolonged by 10 days when the dosage of DiAC10 reached 0.9 mol%, by reason of the intermolecular dissociation between hydrophobic micro-blocks.
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Yu, Q., Wu, X., Hu, X. et al. Amphiphilic microblock tough cationic hydrogels with reduced permeability of the fluid channels: synthesis and properties. Iran Polym J 27, 483–493 (2018). https://doi.org/10.1007/s13726-018-0625-6
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DOI: https://doi.org/10.1007/s13726-018-0625-6