油田用玻璃钢管老化行为与机制的实验研究

Experimental Study on Aging Behavior and Mechanism of Glass Fiber Reinforced Composite Pipes for Oilfield

本文在对芳胺固化型玻璃钢(GFRP)管开展模拟油田服役环境下加速老化实验的基础上,对GFRP管的老化行为与老化机理进行了分析讨论。采用光学显微镜和扫描电镜对老化后样品表观形貌与微观结构变化进行了观察分析。结果表明,油田服役环境会造成表层树脂溶解和裸露纤维的溶蚀。通过衰减全反射傅立叶变换红外光谱分析验证了老化吸水和玻纤水解的行为。与此同时,环向拉伸强度的衰减规律表明水热环境对GFRP管的力学性能影响显著,主要基于表面树脂的物理溶解、表面暴露纤维的显著水解损伤以及树脂纤维界面粘接性的破坏。

Based on the accelerated ageing experiments of aromatic amine-cured glass fiber reinforced pipe(GFRP)under simulated oilfield service environment,ageing behavior and mechanisms of the GFRP tubes at different times were analyzed and discussed.The apparent morphology and microstructure change of after aging samples were analyzed by optical microscope and scanning electron microscope.The results show that the oilfield service environment could cause the dissolution of surface resin and the corrosion of bare fiber.The behavior of aging water absorption and glass fiber hydrolysis was verified by Fourier transform infrared spectroscopy.At the same time,the attenuation law of the circumferential tensile strength indicates that hydrothermal environment has a significant effect on the mechanical properties of GFRP tubes,which is mainly based on the physical dissolution of the surface resin,the significant hydrolysis damage of the surface exposed fiber and the damage of the interface adhesion of the resin fiber.