Stimuli-responsive poly(acrylamide-co-vinyl acetate)/alginate-based hydrogel particle (AIPNG particle) are obtained by free-radical polymerization of acrylamide monomer and vinyl acetate monomer which interpenetrates with branched polyethyleneimine (B-PEI)/alginate-based polyelectrolyte complex (PEC). The AIPNG particle is developed for reservoir conformance control in Ca-rich reservoirs. The AIPNG particle can swell 13 to 25 times its initial volume, and the equilibrium swelling ratio is dependent on brine type and concentration. The swelling and elastic modulus of the AIPNG particles are strongly influenced by salt in the aqueous solution. The release rate of B-PEI from B-PEI/alginate PEC structure, combining with the swelling ratio, the environmental temperature, and Ca²⁺ concentration, determines the self-association time and rheological strength of the AIPNG gel. Preparation pH influences the protonation degree of B-PEI and subsequently affects the self-association behavior by delaying the intermolecular transamidation reaction between poly(AM-co-VA) acrylamide pendant groups and PEI nitrogens. With the component adjustments, the self-association starting time can be controlled between 2 and 16 h depending on temperature and swelling ratio. Ca²⁺, supported from environmental brine, can influence the self-association time and help reinforce the re-formed bulk gel by forming Ca-alginate bonds and creating a hard Ca-shell on the gel surface. Field trial results in Zhidan oilfield demonstrated the potential of AIPNG particle products in high-salinity/middle-temperature reservoirs which provided a new way for maintaining the oil production and reducing water-cut in the mature oilfields.

通过丙烯酰胺单体和乙酸乙烯酯单体与支化聚乙烯亚胺（B-PEI）/海藻酸盐基互穿的自由基聚合获得刺激响应性聚（丙烯酰胺-共-乙酸乙烯酯）/海藻酸盐基水凝胶颗粒（AIPNG颗粒）聚电解质复合物（PEC）。AIPNG 颗粒是为富钙储层中的储层一致性控制而开发的。AIPNG 颗粒可以膨胀 13 到 25 倍其初始体积，平衡膨胀率取决于盐水类型和浓度。AIPNG 颗粒的溶胀和弹性模量受水溶液中盐的强烈影响。B-PEI/藻酸盐PEC结构中B-PEI的释放速率，结合溶胀率、环境温度和Ca ²⁺浓度，决定了 AIPNG 凝胶的自缔合时间和流变强度。制备 pH 值影响 B-PEI 的质子化程度，并通过延迟聚 (AM-co-VA) 丙烯酰胺侧基和 PEI 氮之间的分子间转酰胺反应影响自缔合行为。通过组分调整，根据温度和溶胀比，自缔合开始时间可以控制在 2 到 16 小时之间。钙²⁺由环境盐水支持，可以影响自结合时间，并通过形成海藻酸钙键并在凝胶表面形成硬钙壳来帮助增强重新形成的本体凝胶。志丹油田现场试验结果证明了AIPNG颗粒产品在高盐度/中温油藏中的应用潜力，为成熟油田保油减水提供了新途径。