College of Petroleum Engineering, Liaoning Petrochemical University, Fushun 113001, China.
Research Institute of Drilling and Production Technology, PetroChina Qinghai Oilfield Company, Dunhuang 736202, China.
Molecules. 2023 Jan 28;28(3):1279. doi: 10.3390/molecules28031279.
Betaine is a new surfactant with good application prospects in high-temperature and high-salinity reservoirs. The interfacial properties of two kinds of betaine mixtures with a good synergistic effect were evaluated in this paper. On this basis, the effects of temperature-resistant, salt-resistant polymers with different contents of 2-acrylamide-2-methylpropanesulfonic acid (AMPS) on dynamic interfacial tensions (IFTs) against n-alkanes and crude oil were studied. The experimental results show that the IFTs between betaine ASB and n-alkanes can be reduced to ultra-low values by compounding with anionic surfactant petroleum sulfonate (PS) and extended anionic surfactant alkoxyethylene carboxylate (AEC), respectively. ASB@AEC is very oil-soluble with n value ≥14, and ASB@PS is relatively water-soluble with n value of 10. The water solubility of both ASB@PS and ASB@AEC is enhanced by the addition of water-soluble polymers. The HLB of the ASB@AEC solution becomes better against crude oil after the addition of polymers, and the IFT decreases to an ultra-low value as a result. On the contrary, the antagonistic effect in reducing the IFT can be observed for ASB@PS in the same case. In a word, polymers affect the IFTs of surfactant solutions by regulating the HLB.
甜菜碱是一种新型表面活性剂，在高温高盐油藏中有很好的应用前景。本文评价了两种具有良好协同效应的甜菜碱混合物的界面性质。在此基础上，研究了不同含量 2-丙烯酰胺-2-甲基丙磺酸（AMPS）的耐温、耐盐聚合物对正烷烃和原油的动态界面张力（IFT）的影响。实验结果表明，通过与阴离子表面活性剂石油磺酸盐（PS）和扩展阴离子表面活性剂烷氧基乙氧基羧酸（AEC）复配，甜菜碱 ASB 与正烷烃之间的 IFT 可降至超低值。ASB@AEC 非常油溶性，n 值≥14，而 ASB@PS 相对水溶性，n 值为 10。水溶性聚合物的加入提高了 ASB@PS 和 ASB@AEC 的水溶性。聚合物的加入使 ASB@AEC 溶液的 HLB 对原油的性能得到改善，IFT 因此降低至超低值。相反，在相同情况下，ASB@PS 会观察到降低 IFT 的拮抗作用。总之，聚合物通过调节 HLB 来影响表面活性剂溶液的 IFT。
