Li Jia, Wen Ming, Jiang Zeyin, Gao Shangjun, Xiao Xiao, Xiang Chao, Tao Ji
Research Institute of Natural Gas Technology, PetroChina Southwest Oil & Gas Field Company, Chengdu, 610213, Sichuan, China.
PetroChina Southwest Oil & Gas Field Company, Chengdu, 610051, Sichuan, China.
Sci Rep. 2025 Jan 18;15(1):2376. doi: 10.1038/s41598-025-87010-x.
A Gemini cationic surfactant was synthesized through an aldehyde-amine condensation reaction to address challenges related to bacterial corrosion and foaming during shale gas extraction. This treatment agent exhibits sterilization, corrosion mitigation, and foaming properties. The mechanism of action was characterized through tests measuring surface tension, particle size, sterilization efficacy, corrosion mitigation efficiency, and foaming behavior. Results from the surface tension test indicate that at 60 °C, surfactants with a low carbon chain structure achieve the lowest surface tension of 32.61 mN/m at the critical micelle concentration. Particle size distribution (PSD) tests reveal that within the 1-10 critical micelle concentration range, three types of surfactants can form aggregates through self-assembly, with a PSD range of 100-400 nm. Antibacterial performance tests demonstrate that a concentration of 0.12 mmol/L at 20-60 °C achieves a bactericidal rate exceeding 99%, maintained even after 24 h of contact. The bactericidal effect is enhanced under acidic and alkaline conditions. Corrosion mitigation tests show that at 50 °C, the corrosion mitigation rate reaches an optimal value of over 70%. Bubble performance evaluation results suggest that the optimal surfactant concentration is 1 mmol/L at 60 °C, exhibiting resistance to mineralization up to 200 g/L. The development of this surfactant establishes a foundation for effectively addressing issues related to bacterial corrosion and wellbore fluid encountered in shale gas wells.
通过醛胺缩合反应合成了一种 Gemini 阳离子表面活性剂，以应对页岩气开采过程中与细菌腐蚀和起泡相关的挑战。这种处理剂具有杀菌、缓蚀和起泡性能。通过测量表面张力、粒径、杀菌效果、缓蚀效率和起泡行为的测试对其作用机理进行了表征。表面张力测试结果表明，在 60°C 时，具有低碳链结构的表面活性剂在临界胶束浓度下达到最低表面张力 32.61 mN/m。粒径分布（PSD）测试表明，在 1-10 临界胶束浓度范围内，三种类型的表面活性剂可通过自组装形成聚集体，PSD 范围为 100-400 nm。抗菌性能测试表明，在 20-60°C 下浓度为 0.12 mmol/L 时杀菌率超过 99%，接触 24 小时后仍保持该杀菌率。在酸性和碱性条件下杀菌效果增强。缓蚀测试表明，在 50°C 时，缓蚀率达到最佳值超过 70%。气泡性能评估结果表明，在 60°C 时最佳表面活性剂浓度为 1 mmol/L，对高达 200 g/L 的矿化具有抗性。这种表面活性剂的开发为有效解决页岩气井中遇到的细菌腐蚀和井筒流体问题奠定了基础。
