西安石油大学学报（自然科学版）2024，Vol.39Issue(3)：82-93,12.DOI:10.3969/j.issn.1673-064X.2024.03.010
高含黏土页岩气储层闷井返排数值模拟
Numerical Simulation of Shut-in and Flowback Process in Shale Gas Reservoirs with High Clay Content
摘要
Abstract
For shale reservoirs with high clay content,the hydration damage caused by large-scale hydraulic fracturing cannot be ig-nored.In this article,a mathematical model for shale gas reservoirs with high clay content during shut-in and flowback process is estab-lished,and the accuracy of the model is verified by production data of condensate shale gas reservoirs with high clay content in Jurassic Dongyuemiao member of Fuxing area.The liquid distribution in the reservoir,the reduction of effective porosity and the hydration dam-age degree of permeability during the shut-in and flowback process were simulated considering the influence of clay hydration and ex-pansion.The results show that the hydration damage degree of fracturing fluid to the shale matrix increases with the increase of shut-in time.After 100 days of shut-in process,the effective porosity of the reservoir decreases by 7.0%to 17.6%due to the hydration expan-sion of the clay,and the damage degree of permeability is 13%to 31%.The clay hydration damage degree during the fracturing fluid flowback process is less than 3.2%,and compared to not considering clay hydration expansion damage,the predicted initial gas produc-tion is reduced by 11.8%.关键词
复兴地区/黏土矿物/页岩气储层/闷井时间/渗吸Key words
Fuxing area/clay mineral/shale gas reservoir/shut-in time/imbibition分类
能源科技引用本文复制引用
乔润伟,张士诚,王飞,李凤霞,李宁..高含黏土页岩气储层闷井返排数值模拟[J].西安石油大学学报（自然科学版）,2024,39(3):82-93,12.基金项目
国家自然科学基金项目"页岩油储层水力压裂压后关井作用机理研究"(51974332) （51974332）
中国石化科技部项目"复兴侏罗系陆相页岩油气水平井增产改造技术"(P21078-7) （P21078-7）
