采油环境下抽油泵柱塞表面DLC薄膜耐磨特性及磨损机理研究

抽油泵是油气资源可持续开采的关键技术装备之一，而柱塞作为抽油泵的核心部件其快速磨损及过早失效问题严重制约了油气开采的效率和产能。类金刚石（DLC）薄膜凭借其高硬度、高耐磨性、低摩擦系数及良好的耐腐蚀性等优点，对于研制采油环境下长寿命、高可靠的抽油泵柱塞拥有极大研究前景。为此，本项目拟开展采油环境下抽油泵柱塞表面DLC薄膜耐磨特性及磨损机理研究，在建立元素掺杂、多层结构设计与DLC薄膜可控制备的基础上，研究各典型采油环境因素对DLC薄膜摩擦磨损行为的影响规律，阐明DLC薄膜摩擦界面之间的宏观与微观演化机制，并结合分子动力学模拟研究DLC薄膜摩擦界面环境介质分子与薄膜原子之间的相互作用，进而揭示其摩擦磨损机理，最终为DLC薄膜在抽油泵柱塞表面的实际工程应用提供实验和理论依据。

The oil well pump is one of the key technical equipment for the sustainable exploitation of oil and gas resources. As the core component of the oil well pump, the rapid wear and premature failure of the plunger seriously restrict the efficiency and productivity of oil and gas exploitation. Diamond like carbon (DLC) film has great research prospect for the development of long-life and high reliable plunger of oil well pump in oil extraction environment because of its high hardness, high wear resistance, low friction coefficient and good corrosion resistance. Therefore, this project plans to carry out the research on the wear-resistant characteristics and wear mechanism of DLC film on the plunger surface of oil well pump in oil extraction environment. Based on the establishment of element doping, multilayer structure design and controllable preparation of DLC films, the effects of various typical oil production environment factors on the friction and wear behavior of DLC films were studied, and the macro and micro evolution mechanisms of the friction interface of DLC films were revealed. Based on the molecular dynamics simulation, the interactions between the medium molecules and the film atoms in the friction interface of DLC film were further studied, and the friction and wear mechanisms of DLC film were revealed. Finally, it provides experimental and theoretical basis for the application of DLC film in the actual working condition of the plunger surface of oil well pump.