In order to solve the problem of poor acid-resistant of preformed particle gel (PPG) as conformance control material in reservoirs with supercritical CO₂ flooding, acrylamide (AM), N,N′-methylene bisacrylamide (MBA) and dimethyldiallylammonium chloride (DMDAAC) were used to prepare an acid-resistant preformed particle gel (AR-PPG) by radical polymerization method. Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) were used to analyze the structural property of AR-PPG. The swelling capability, viscoelasticity and shear resistance of AR-PPG in acid environment have been studied. The conformance control system with good dispersion stability was selected and its plugging behavior was studied. The results showed that the swelling ratio of AR-PPG in acid environment was 1.41. Compared with conventional PPG, AR-PPG displayed better swelling capability, shearing resistance and viscoelastic properties in acidic environment. In addition, the conformance control system with good dispersion was 1000 mg/L AR-PPG dispersed in 1000 mg/L cationic polyacrylamide (CPAM) solution. The plugging rate of this conformance control system could be 70.8% in the low permeability micro-fracture core after supercritical CO₂ flooding. This work can provide an alternative material for plugging and conformance control in oilfields of supercritical CO₂ flooding.

为了解决超临界CO ₂储层中作为一致性控制材料的预制颗粒凝胶（PPG）的耐酸性差的问题用丙烯酰胺（AM），N，N′-亚甲基双丙烯酰胺（MBA）和二甲基二烯丙基氯化铵（DMDAAC）通过自由基聚合法制备耐酸的预制颗粒凝胶（AR-PPG）。利用傅里叶变换红外光谱（FTIR）和扫描电子显微镜（SEM）分析了AR-PPG的结构性质。研究了AR-PPG在酸性环境下的溶胀能力，粘弹性和抗剪强度。选择具有良好分散稳定性的一致性控制系统，研究其堵塞行为。结果表明，AR-PPG在酸性环境中的溶胀率为1.41。与常规PPG相比，AR-PPG在酸性环境中显示出更好的溶胀能力，抗剪切性和粘弹性。此外，具有良好分散性的一致性控制系统是将1000 mg / L AR-PPG分散在1000 mg / L阳离子聚丙烯酰胺（CPAM）溶液中。超临界CO后低渗透性微裂缝岩心中该一致性控制系统的堵漏率可达到70.8％。₂水浸。这项工作可以为超临界CO ₂驱油油田的堵漏和一致性控制提供替代材料。