为改善聚丙烯酰胺类乳液减阻剂的溶解性和稳定性,合成了pH刺激响应型表面活性剂的乳化剂,并合成具有pH响应能力的改性聚丙烯酰胺乳液。研究了油水比、乳化剂质量分数对乳液稳定性的影响,使用反相乳液聚合法得到改性聚丙烯酰胺乳液,最佳聚合条件为油水比为0.82、乳化剂质量分数为3%。利用FT-IR及 ¹HNMR对表面活性剂及聚合物的结构进行表征。结果表明,0.5%的改性聚丙烯酰胺乳液在pH小于6或大于8的水中可迅速破乳并溶解,在30 s内便能迅速起黏,并在 1 min 内达到最大黏度。用pH 10的水配制质量分数为0.5%的聚合物溶液,减阻率能达到63%;在盐水中减阻率达到60%。

To improve the dissolution and stabilization of polyacrylamide-based emulsion drag reducer,pH-responsive surfactant is synthesized,and used as emulsifier to synthesize a modified polyacrylamide emulsion with pH sensitivity through inverse emulsion polymerization method.The effects of oil-water ratio and emulsifier dosage on the stability of the emulsion are investigated,and the optimal oil-water ratio and emulsifier dosage are confirmed as 0.82 and 3wt%,respectively.The structures of the surfactant and the polymer are characterized by FT-IR and ¹H-NMR.The modified polyacrylamide emulsion with a dosage of 0.5 wt% can rapidly break and dissolve in water with pH<6 or >8.The solution can quickly start to thicken within 30 s and reach the maximum viscosity within 1 min.The polymer solution with a mass concentration of 0.5% that is formulated in water with pH=10 can achieve a reduction rate of 63%,and can lead to a reduction rate of 60% in saltwater.

李彦萍(1998-),女,硕士研究生,研究方向为油气田应用化学,1960872434@qq.com。