钻井液与完井液2026，Vol.43Issue(1)：57-64,8.DOI:10.12358/j.issn.1001-5620.2026.01.008
含CO2气藏固井水泥浆早期水化进程及性能影响
Early Hydration Process of Well Cement Slurries for Cementing CO2-Contained Gas Reservoirs and Factors Affecting the Performance of the Cement Slurries
摘要
Abstract
In cementing a gas well with CO2 contained in the reservoir,it is inevitable for the cement slurries to contact with the CO2.The length of the contact time will possibly affect the early hydration characteristics and the development of the microstructure of the cement slurries,and worse still is the negative effects of this contact on the quality of well cementing.In this study,the change patterns of the early hydration characteristics,the mechanical properties and the permeability of a cement slurry were systematically investigated by controlling the ventilation time of CO2.Using XRD,TG and SEM etc.,the early phase composition and the evolution pattern of the cement slurry were analyzed.The study showed that the fluidity of the cement slurry was improved in the early stage and was then deteriorating with the time of CO2 ventilation.The setting time of the slurry,on the other hand,was shortened continuously.The hydration heat release curve showed that CO2 treatment significantly accelerated the cement hydration process,and increased the early cumulative released heat.However,as the time of CO2 ventilation increased,these effects became weakening.Compressive strength and permeability test results showed that CO2 treatment significantly enhanced the early strength of the cement slurry,and the best result can be obtained at ventilation time of less than 3 minutes.However,as the ventilation time of CO2 increased,the strength and permeability of the set cement both gradually decreased.XRD,TG and SEM analyses showed that CO2 treatment increased the formation of CaCO3,disrupted the coating structures formed by Ca(OH)2 and the C—S—H gel,and hence accelerated the hydration process of the cement particles.关键词
含CO2气藏/固井/水泥浆/早期水化/加速水化Key words
Gas reservoir with CO2/Well cementing/Cement slurry/Early hydration/Accelerated hydration分类
能源科技引用本文复制引用
邓卓然,刘文超,毕毅,罗阳利,程小伟,梅开元..含CO2气藏固井水泥浆早期水化进程及性能影响[J].钻井液与完井液,2026,43(1):57-64,8.基金项目
四川省科技厅区域创新合作项目"超临界CO2压裂页岩环境下固井水泥石损伤与自修复研究"(2024YFHZ0156). （2024YFHZ0156）
