将N，N-二甲基十八烷基烯丙基氯化铵（C₁₈DMAAC）与丙烯酰胺（AM）、甲基丙烯酰氧乙基三甲基氯化铵（DMC）进行共聚得到一种酸化转向用聚合物PADD，采用单因素法对合成条件进行优化得到反应最佳条件：单体摩尔比n（AM）：n（DMC）：n（C₁₈DMAAC）为85：15：1.2、单体质量分数为30%、引发剂偶氮二乙丁腈盐酸盐（V50）质量分数为0.4%、反应时间为6 h、反应温度为55℃、反应pH为7。聚合物酸溶液随着酸岩反应的进行持续增黏，并且通过不同酸岩反应时间岩石表面形貌的电镜图得到进一步证实。1.3% PADD酸溶液黏度能从48.0 mPa·s增加至423.0 mPa·s，且残酸具有良好的抗温能力，1.3% PADD残酸黏度在90℃下为213.0 mPa·s，为转向酸在高温地层的应用提供理论支持。

PADD, a polymer for acidizing diversion, is obtained through copolymerization among N, N-dimethyl octadecyl allyl ammonium chloride (C18DMAAC), acrylamide (AM) and methacryloyl oxyethyl trimethyl ammonium chloride (DMC).By means of single-factor method, and the optimal synthesis conditions are obtained as follows:the molar ratio of AM, DMC and C18DMAAC is 85:15:1.2, the monomer concentration is 30%, the initiator concentration is 0.4%, the reaction time is 6 h, the reaction temperature is at 55℃, and pH is 7.The polymer acid solution continues to thicken as the acid-rock reaction is performing, which is confirmed through SEM images of rock surface after different acid rock reaction time.The viscosity of the 1.3% PADD acid solution increases from 48.0 mPa·s to 423.0 mPa·s.Spent 1.3% PADD acid shows a good temperature resistance.The viscosity of spent 1.3 wt.% PADD acid at 90℃ is still 213.0 mPa·s, providing theoretical support for the application of diverting acid in high-temperature formations.

尚玲(1985-),女,硕士,工程师,主要从事储层研究工作,shangling_ll@petrochina.com.cn