Abou-Alfitooh Samah A M, Mohamed Ammona S, Abdelhafiz Fatma M, Zahran Ahmed, Hosny R
EOR Lab, Production Department, Egyptian Petroleum Research Institute, 1 Ahmed El Zomor St., Nasr City, Cairo, 11727, Egypt.
Core Lab Center, Egyptian Petroleum Research Institute (EPRI), 1 Ahmed El Zomor St., Nasr City, Cairo, 11727, Egypt.
Sci Rep. 2025 Sep 12;15(1):32509. doi: 10.1038/s41598-025-17757-w.
This study investigates the application of a synthesized cationic hyperbranched polyamidoamine (PAMAM) dendrimer surfactant (G2-C12) as a novel chemical agent for enhanced oil recovery (EOR) in sandstone reservoirs under realistic high-salinity and high-temperature conditions. The dendrimer was synthesized via a divergent approach involving Michael addition, amidation, and quaternization, yielding a structurally defined amphiphilic macromolecule. Its performance was evaluated through interfacial tension (IFT) measurements, salinity-dependent behavior, wettability alteration tests, and core flooding experiments. The surfactant reduced IFT from 27 mN/m to 5 mN/m at 2000 ppm, which was identified as the critical micelle concentration (CMC). Contact angle measurements confirmed a significant shift from oil-wet to strongly water-wet conditions (10.87°–34.57°). Additional salinity tests established the optimal brine strength, while core flooding results demonstrated an incremental oil recovery of 29.09% at reservoir-representative conditions. These findings underscore the dendrimer’s dual-function mechanism, operational stability, and strong potential as a high-performance EOR surfactant under challenging field environments.
本研究考察了一种合成的阳离子超支化聚酰胺胺（PAMAM）树枝状大分子表面活性剂（G2-C12）作为一种新型化学剂，在实际的高盐度和高温条件下用于砂岩油藏提高采收率（EOR）的应用情况。该树枝状大分子通过包括迈克尔加成、酰胺化和季铵化的发散法合成，得到一种结构明确的两亲性大分子。通过界面张力（IFT）测量、盐度依赖性行为、润湿性改变测试和岩心驱替实验对其性能进行了评估。该表面活性剂在2000 ppm时将IFT从27 mN/m降低至5 mN/m，这被确定为临界胶束浓度（CMC）。接触角测量证实从油湿条件到强水湿条件有显著转变（10.87°–34.57°）。额外的盐度测试确定了最佳盐水强度，而岩心驱替结果表明在油藏代表性条件下采收率提高了29.09%。这些发现强调了树枝状大分子在具有挑战性的油田环境下作为高性能EOR表面活性剂的双重功能机制、操作稳定性和强大潜力。
