A novel enhanced oil recovery (EOR) method based on polymer gel-assisted carbon dioxide (CO₂) huff and puff was developed aiming to improve the development effect of heavy oil reservoirs with high water cut. The polymer gel prepared using partially hydrolyzed polyacrylamide (HPAM), hexamethylenetetramine, phenol, resorcinol, oxalic acid, and thiocarbamide as raw materials had a special network structure to overcome the challenge of significant heterogeneity in heavy oil reservoirs. The strength of polymer gel reached the maximum value 20,000 mPa·s within 22 h. The temperature resistance and salt resistance of polymer gel directly determined the plugging effect. The polymer gel was placed for 190 days at 85 ℃, and its apparent viscosity retention rate was 66.4%. The salt resistance experiments showed that the apparent viscosity retention rate of this polymer gel at 1.8 wt % NaCl, 0.045 wt % CaCl₂, 0.045 wt % MgCl₂ was 71.3%, 78.5%, 71.4%, respectively. Huff and puff experiments confirmed that this method could be used to increase the sweep volume and improve the oil displacement efficiency of heavy oil reservoirs with high water cut. Furthermore, the EOR of this method was better than that of water huff and puff, polymer gel huff and puff or CO₂ huff and puff.

基于聚合物凝胶辅助二氧化碳 (CO ₂) 吞吐和吞吐是为了提高高含水稠油油藏的开发效果而开发的。以部分水解聚丙烯酰胺（HPAM）、六亚甲基四胺、苯酚、间苯二酚、草酸和硫脲为原料制备的聚合物凝胶具有特殊的网络结构，克服了稠油储层显着非均质性的挑战。聚合物凝胶强度在22 h内达到最大值20,000 mPa·s。聚合物凝胶的耐温性和耐盐性直接决定了堵漏效果。聚合物凝胶在85℃下放置190天，其表观粘度保持率为66.4%。耐盐性实验表明，该聚合物凝胶在 1.8 wt % NaCl、0.045 wt % CaCl _{2 下}的表观粘度保持率、0.045wt% MgCl _{2 分别}为71.3%、78.5%、71.4%。吞吐实验证实，该方法可用于增加波及体积，提高高含水稠油油藏的驱油效率。此外，该方法的EOR优于水吞吐、聚合物凝胶吞吐或CO ₂吞吐。