油水耦合介质中石墨烯改性环氧涂层的防腐性能及机理研究

With the development of oilfield entering the high water-cut stage, the damage of the water injection string is becoming increasingly serious under the action of multi-phase coupling corrosion media, such as water, oil, gas and solid. Conventional anticorrosion technology of the water injection string, such as organic coatings, have inevitable pin holes and show poor wear and erosion resistance. This brings a hidden danger for safety of production and environment of oil fields. In recent years, graphene modified epoxy coatings are receiving increasing attention due to their excellent corrosion resistance. unfortunately, the corrosion resistance and mechanism of graphene modified epoxy coatings in the coupled oil and water multi-phase medium were not reported until now. Taking the coupled effect of oil and water, nature of graphene and the outer working conditions into consideration, this project intends to investigate the anticorrosion behavior and mechanism of the graphene modified epoxy coating in coupled oil and water corrosion medium, further to establish the relationship of structure evolution and the long term service properties of the graphene modified epoxy coating in the coupled oil and water multi-phase medium. The results will not only present scientific guide in determing surface protection of water injection string design and material selection around factual water flooding engineering in xinjiang oilfield or other area, but also can promote the application of graphene materials in petroleum and petrochemicals industry.

随着油田开发进入高含水期，在水、油、气、固共存的多相耦合腐蚀介质作用下，注水井管柱损坏问题日益严重。传统的注水井管柱防腐技术如涂层难以避免的含针孔等本征缺陷，耐磨耐冲蚀性能较差，给油田的安全生产和生态环境带来巨大隐患。近年来，石墨烯改性环氧涂层因优异的防腐性能成为科学家们研究的热点。目前为止，对注水井管柱服役工况下油水多相耦合介质中石墨烯改性环氧涂层防腐性能和机理的研究尚未涉及。本项申请拟在充分考虑油水介质耦合作用、石墨烯结构形态、腐蚀介质特性、外界物理条件变化的基础上，研究油水耦合介质中石墨烯改性环氧涂层的防腐性能和机理，揭示石墨烯改性环氧涂层长时服役性能与其结构演变的对应关系。研究成果将依托新疆油田等注水开发工程，不仅能为注水井管柱防腐技术的设计和选材提供科学依据，还对促进石墨烯材料在石油石化重防腐领域的发展应用具有重大意义。

随着油田开发进入高含水期，在水、油、气、固共存的多相耦合腐蚀介质作用下，注水井管柱损坏问题日益严重。传统的注水井管柱防腐技术如涂层难以避免的含针孔等本征缺陷，耐磨耐冲蚀性能较差，给油田的安全生产和生态环境带来巨大隐患。石墨烯改性环氧涂层因优异的防腐性能有望成为解决管柱腐蚀问题的首选涂层。本项目在充分考虑油水介质耦合作用、石墨烯结构形态、腐蚀介质特性、外界物理条件变化的基础上，研究了油水耦合介质中石墨烯改性环氧涂层的防腐性能和机理，揭示了在石墨烯有效分散的情况下，石墨烯改性环氧涂层的耐蚀性能随石墨烯比表面积/粒径增大与还原度提高，其耐蚀性能提升数倍甚至数十倍的规律。H2S、Cl-等腐蚀介质浓度增加显著降低涂层的耐蚀性能；但是，因原油的疏水性和及其对涂层的溶胀效应，在短期服役时反而能提高涂层的耐蚀性能，随着服役时间延长，原油中的腐蚀介质与涂层发生反应，引起涂层中键断裂与涂层脆化，使涂层的耐蚀性能下降。温度与压力提高使涂层耐蚀性能下降。石墨烯优异的抗渗性、负的热膨胀效应是其在高温高压油水耦合介质中提升涂层耐蚀性能的主要原因。研究成果依托长庆油田等注水开发工程开展了示范应用，不仅能为石油专用管防腐技术的设计和选材提供科学依据，还对促进石墨烯材料在石油石化重防腐领域的发展应用具有重大意义。