【摘要】 为满足深层、深海及非常规油气开发中极端工况下油套管螺纹密封的长寿命与高可靠性需求，采用计算流体动力学中的离散相模型和混合模型，分析螺纹脂中固体颗粒的冲蚀行为和流体成分的流失过程，系统研究其密封性能及失效机制。结果表明：螺纹脂密封失效是由固体颗粒冲蚀与流体成分流失双重机制驱动的多阶段渐进式破坏过程，传统“高黏度基液+大颗粒填料”设计模式存在显著局限；据此提出“颗粒-基体-界面协同优化”设计理论，通过构建“高黏度高密度基液-高维氏硬度小粒径填料-强界面相容性”三元耦合体系提升密封性能。更多还原

【Abstract】 To meet the long-term and high-reliability sealing requirements of oil casing threads under extreme working conditions in deep-layer, deep-sea, and unconventional oil and gas development, the erosion behavior of solid particles and the loss of fluid components in thread compounds were analyzed using the discrete phase model(DPM) and mixture model in computational fluid dynamics(CFD). The sealing performance and failure mechanisms were systematically investigated. The results indicate that the sealing failure of thread compounds is a multi-stage progressive failure process driven by the dual mechanisms of solid particle erosion and fluid component loss. Traditional design strategies relying on high-viscosity base fluid and large-particle fillers exhibit significant limitations. Consequently, a novel design theory termed particle-matrix-interface synergistic optimization is proposed, enhancing sealing performance by constructing a ternary coupling system of "high viscosity and high density base fluid-high Vickers hardness and small particle fillers-strong interfacial compatibility".更多还原