【摘要】 三元复合驱技术应用过程中存在的结垢问题会使管道截面积变小,能耗增加,影响油田的正常生产。目前关于结垢问题的研究多针对单一垢展开,而三元复合驱油体系下的结垢产物主要为CaCO₃垢和SiO₂垢的混合垢。通过查阅国内外相关文献,总结了CaCO₃垢和SiO₂垢各自的成垢过程,研究了沉淀过程中CaCO₃与SiO₂之间的相互作用。研究表明,这种混合垢形成过程是涉及离子成垢与胶体成垢的复杂结垢过程,SiO₂垢通过吸附在CaCO₃垢表面共同沉淀析出,混合垢形貌多以球形为主,吸附的多聚物SiO₂抑制了CaCO₃向方解石的转化。由于混合垢的研究尚处于初始阶段,未来仍须对CaCO₃与SiO₂间的协同作用机制,温度和pH值等因素对混合垢沉淀过程的影响,混合垢的防垢技术及相关除垢剂的研究等问题做进一步研究。更多还原

【Abstract】 The occurrence of scaling problem during the application of ASP flooding reduces the cross-sectional area of the pipeline and increases the energy consumption,which will affect the normal production of oilfield. At present, the research on the scaling problem is mostly directed to the single scale,while in the ASP flooding system,the main scale is the mixed scale of CaCO₃ and SiO₂. By consulting relevant literature at home and abroad,the scale formation process of CaCO₃ and SiO₂ is summarized,and the interaction between CaCO₃ and SiO₂ during the precipitation process is studied. The research shows that the mixed scale scaling process is a complex scaling process involving ionic scaling and colloidal scaling. SiO₂ scale is co-precipitated out by adsorbing on the surface of CaCO₃. The morphology of the mixed scale is mostly spherical, and the adsorbed polymer SiO₂ inhibits the conversion of CaCO₃ to calcite. As the research of mixed scale is still in the initial stage,further research is needed on the synergistic mechanism between CaCO₃ and SiO₂, the influence of temperature and pH on the mixed scale precipitation process, the anti-scaling technology of mixed scale and the related descaling agent.更多还原