Zhao Xuan, Wan Jun, Qv Xuefeng, Yu Yajun, Zhao Huiyan
Chevron China Energy Company, Beijing 100004, China.
Shenzhen Branch, CNOOC (China) Co., Ltd., Shenzhen 518067, China.
Polymers (Basel). 2025 Jun 30;17(13):1827. doi: 10.3390/polym17131827.
In offshore oil and gas extraction, riser pipes serve as the first isolation barrier for wellbore integrity, playing a crucial role in ensuring operational safety. Protective coatings represent an effective measure for corrosion prevention in riser pipes. To address issues such as electrochemical corrosion and poor adhesion of existing coatings, this study developed an underwater-curing composite material based on a polyisobutylene (PIB) and butyl rubber (IIR) blend system. The material simultaneously exhibits high peel strength, low water absorption, and stability across a wide temperature range. First, the contradiction between material elasticity and strength was overcome through the synergistic effect of medium molecular weight PIB internal plasticization and IIR crosslinking networks. Second, stable peel strength across a wide temperature range (-45 °C to 80 °C) was achieved by utilizing the interfacial effects of nano-fillers. Subsequently, an innovative solvent-free two-component epoxy system was developed, combining medium molecular weight PIB internal plasticization, nano-silica hydrogen bond reinforcement, and latent curing agent regulation. This system achieves rapid surface drying within 30 min underwater and pull-off strength exceeding 3.5 MPa. Through systematic laboratory testing and field application experiments on offshore oil and gas well risers, the material's fundamental properties and operational performance were determined. Results indicate that the material exhibits a peel strength of 5 N/cm on offshore oil risers, significantly extending the service life of the riser pipes. This research provides theoretical foundation and technical support for improving the efficiency and reliability of repair processes for offshore oil riser pipes.
在海上石油和天然气开采中，立管是井筒完整性的第一道隔离屏障，对确保作业安全起着至关重要的作用。防护涂层是立管防腐的有效措施。为了解决现有涂层的电化学腐蚀和附着力差等问题，本研究开发了一种基于聚异丁烯（PIB）和丁基橡胶（IIR）共混体系的水下固化复合材料。该材料同时具有高剥离强度、低吸水性和在宽温度范围内的稳定性。首先，通过中分子量PIB内增塑和IIR交联网络的协同作用克服了材料弹性和强度之间的矛盾。其次，利用纳米填料的界面效应实现了在宽温度范围（-45℃至80℃）内稳定的剥离强度。随后，开发了一种创新的无溶剂双组分环氧体系，结合中分子量PIB内增塑、纳米二氧化硅氢键增强和潜伏性固化剂调控。该体系在水下30分钟内实现快速表面干燥，拉拔强度超过3.5MPa。通过对海上油气井立管进行系统的实验室测试和现场应用实验，确定了该材料的基本性能和作业性能。结果表明，该材料在海上石油立管上的剥离强度为5N/cm，显著延长了立管的使用寿命。本研究为提高海上石油立管修复工艺的效率和可靠性提供了理论基础和技术支持。
