Tian Yuexin, Liu Yintao, Dong Haifeng, Liu Xiangjun, Huang Jinjun
Petroleum Engineering Technology Institute of Southwest Petroleum Branch, SINOPEC, Deyang 618000, China.
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China.
Polymers (Basel). 2025 Jun 15;17(12):1660. doi: 10.3390/polym17121660.
Poor interfacial bonding and wetting incompatibility limit the performance of degradable liquid plugs under high-pressure conditions. It is hypothesized that silane-induced interfacial engineering can build a multiscale structure that enhances adhesion via coupled wetting, penetration, and interlocking mechanisms.
A C18 silane-modified steel surface was constructed and tested for its bonding behavior with an epoxy-based degradable plug. Interfacial strength, compressive capacity, and microstructure were analyzed using mechanical tests, SEM, AFM, and contact angle measurements. Surface energy was calculated via the Owens-Wendt model.
The silane-treated interface exhibited a significant enhancement in interfacial bonding strength (up to 445%) and shear strength (73.8% increase), attributed to the formation of a 391.6 nm thick infiltrated interlayer and strong chemical anchoring (Si-O-Fe bonds). Contact angle decreased from 74.0° to 53.6°, with interfacial energy increasing by 26.2%, confirming improved wettability and energy compatibility. A triadic enhancement pathway of "wetting-penetration-interlocking" was established, supported by microstructural imaging and theoretical modeling. This work provides mechanistic insights and practical guidance for the design of robust liquid plug systems in complex wellbore environments.
界面结合不良和润湿性不兼容限制了可降解液体栓塞在高压条件下的性能。据推测，硅烷诱导的界面工程可以构建一种多尺度结构，通过耦合的润湿、渗透和联锁机制增强附着力。
构建了一个C18硅烷改性钢表面，并测试了其与环氧基可降解栓塞的结合行为。使用力学测试、扫描电子显微镜（SEM）、原子力显微镜（AFM）和接触角测量分析了界面强度、抗压能力和微观结构。通过欧文斯-温德特模型计算表面能。
硅烷处理过的界面在界面结合强度（提高了445%）和剪切强度（提高了73.8%）方面有显著增强，这归因于形成了一个391.6纳米厚的渗透中间层和强化学锚固（Si-O-Fe键）。接触角从74.0°降至53.6°，界面能增加了26.2%，证实了润湿性和能量兼容性得到改善。通过微观结构成像和理论建模，建立了“润湿-渗透-联锁”的三元增强途径。这项工作为在复杂井筒环境中设计坚固的液体栓塞系统提供了机理见解和实际指导。
