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。
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.
作者
孙云龙
邢晓凯
SUN Yunlong;XING Xiaokai(China University of Petroleum (Beijing)
出处
《油气田地面工程》
2019年第7期8-12,共5页
Oil-Gas Field Surface Engineering
基金
国家自然基金项目资助(51574259)
